1 

UNITED STATES DISTRICT COURT 

FOR THE DISTRICT OF COLUMBIA 

__________________________________________ 

) 

HITACHI KOKI CO., LTD., ) 

 ) 

 Plaintiff, ) 

 ) 

 v. ) Civil Action No. 07-1504 (ESH) 

 ) 

JOHN J. DOLL, Acting Director, ) 

United States Patent and Trademark Office, ) 

 ) 

 Defendant. ) 

__________________________________________) 

MEMORANDUM OPINION

Plaintiff Hitachi Koki USA, Ltd. (“Hitachi”) seeks review under 35 U.S.C. § 145 of the 

denial by the United States Patent and Trademark Office’s Board of Patent Appeals and 

Interferences (“Board”) of Hitachi’s application for a patent for its desktop cutting machine with 

a tiltable saw (“the Hitachi device”). After denying the parties’ cross-motions for summary 

judgment, see Hitachi Koki Co., Ltd. v. Dudas (“Hitachi I”), 556 F. Supp. 2d 41, 49 (D.D.C. 

2008), the Court conducted a trial on April 23 and 24, 2009, where the parties introduced expert 

testimony. Based on the entire record and the relevant law, the Court finds that the subject 

matter of Hitachi’s patent would have been obvious to a person having ordinary skill in the art, 

and therefore it affirms the Board’s denial of Hitachi’s patent under 35 U.S.C. § 103(a). 

BACKGROUND

On January 20, 1995, the United States Patent and Trademark Office (“PTO”) issued 

U.S. Patent Number 5,425,294 (“the ’294 patent” or “the Hitachi patent”) to Hitachi, as assignee 

of named inventors Shigeharu Ushiwata and Ryuichi Imamura, for a “desk-top cutting machine 

with tiltable saw.” (See Trial Joint Exhibit [“Jt. Ex.”] 1 at 1.) This saw is depicted in the ’294 
2 

patent in the following drawings, among others: 

(See id.) The saw assembly is mounted atop a pivot point, so that the user pushes the saw 

downward in order to cut into the workpiece, which rests on a turntable that is part of the saw’s 

base. The Hitachi device can be used to make (1) “miter” cuts, where the user first rotates the 

workpiece in the turntable and then cuts with the blade in a “zero-tilt” position perpendicular to 

the workpiece surface; (2) “bevel” cuts, where the workpiece is not rotated but the saw is tilted 

downward to the left or right from zero-tilt before cutting, so that the blade will intersect the 

workpiece surface at an acute angle; and (3) “compound” cuts, where the user both rotates the 

workpiece and tilts the saw assembly before making the cut. (See Jt. Ex. 11 (Decl. of Paul Hatch 

[“Hatch Decl.”]) at 3-4 ¶ 7.) Devices that can make bevel cuts in one direction are known as 

“single-bevel” miter saws, while those (like Hitachi’s) that can make bevel cuts in both 

directions are known as “dual-bevel” miter saws. (Id. at 4 ¶ 8.) Workpieces whose ends have 
3 

been cut at a 45° angle can be fit together to form right-angled corners. 

On June 20, 1997, pursuant to 35 U.S.C. § 251, Hitachi voluntarily surrendered the ’294 

patent and filed Reissue Application 08/879,517 (“the ’517 application”), adding a number of 

patent claims. Reissue applications are examined in the same manner as newly submitted 

applications and are thus subject to the same requirements that govern newly submitted 

applications. See 37 C.F.R. § 1.176(a). After reviewing Hitachi’s reissue application, the PTO 

Examiner (“Examiner”) denied Claim 1, among others, as obvious under 35 U.S.C. § 103(a) and 

therefore not unpatentable. (See Jt. Ex. 4 (Feb. 2, 2005 PTO Final Office Action) [“Examiner’s 

Decision”] at 2.) Plaintiff appealed to the Board but requested review only of Claim 1, leaving 

that as the sole claim at issue in this case. (Jt. Ex. 2 (Oct. 19, 2006 Board Decision on Appeal) 

[“Board’s Decision”] at 3 (“For the convenience of the Board, Appellant will argue the 

patentability of independent claim 1. The other claims stand or fall together with claim 1.” 

(quoting Hitachi’s brief)).) 

Claim 1 consists of eight elements (hereinafter, “Element 1” through “Element 8”) and 

reads as follows, with numbers added for ease of reference: 

A desk-top cutting machine, comprising: 

(1) a base on which a workpiece to be cut is supported, said base including a top surface; 

(2) a turntable rotatably disposed in said base and including a top surface; 

(3) a holder supported by said turntable for tilting transversely in opposite directions 

about a zero-tilt angle position; 

(4) a circular saw blade; 

(5) a saw shaft located above said holder for supporting said saw so that said saw is 

swung up and down relative to said base, about a pivot shaft; 

(6) a circular saw assembly having a motor covered by a housing; 
4 

(7) a motor shaft of said motor being disposed in parallel with and above said saw shaft; 

(8) transmission means through which said motor shaft is connected to said saw shaft so 

that an axis of said motor shaft is shifted from an axis of said saw shaft by a 

distance which is greater than or equal to the radius of said circular saw blade, 

wherein when said holder is tilted in either of said opposite directions by an angle 

greater than or equal to 45 degrees with respect to the zero-tilt angle position, said 

housing does not contact said top surface of said base. 

(Jt. Ex. 1 at 9.) 

The Board affirmed the denial of Claim 1 in light of five prior art references. (See 

Board’s Decision at 12.) The first reference was what Hitachi’s application recognized as prior 

art (“Applicant’s Admitted Prior Art” or “AAPA”), as depicted in Figures 6 and 7 of the ’294 

patent and disclosed in lines 11 through 33 of column 1 of the patent specification. (Jt. Ex. 1 at 4 

(figs.6 & 7), 8.) Resembling a conventional single-bevel desktop miter saw, the motor shaft of 

the AAPA is “disposed in parallel with” the saw shaft and connected through “toothed 

engagement,” so that the motor projects perpendicularly from one side of the saw assembly, near 

the center of the blade: 

(Id.) 
5 

The second reference discussed was U.S. Patent No. 5,357,834 (filed May 18, 1993), 

issued to Ito et al. (“Ito”) on October 25, 1994. Ito discloses a dual-bevel desktop miter saw 

whose motor shaft projects upward at an angle from the center of saw blade and transmits power 

to the saw shaft using beveled gears: 

(See Jt. Ex. 7 at 1.) 

The third reference was U.S. Patent No. 4,574,670, issued in 1986 to Johnson 

(“Johnson”). The patent describes a “multiple angle cutting apparatus” and features a motorized 

saw blade mounted on a positioning mechanism that can rotate and tilt: 

(See Jt. Ex. 8 at 1.) 

The fourth reference was U.S. Patent No. 1,417,669, issued in 1922 to Langworthy 
6 

(“Langworthy”), which describes a motorized surgical saw: 

(See Jt. Ex. 9 at 1.) 

The fifth reference was U.S. Patent No. 3,013,592, issued in 1961 to Ambrosio et al.

(“Ambrosio”), which describes a “tilting table saw” featuring a motorized blade mounted 

underneath the cutting surface: 

(See Jt. Ex. 10 at 1.) 

The Board also discussed a sixth reference, Japanese Utility Model Application (OPI) 

No. 49901/88 (“JPN ’901”) (also known as Japanese Laid-Open Utility Model Publication No. 

63-49901), which both the ’294 patent and Ito “recognized [as] prior art designs.” (Board’s 

Decision at 20; see Jt. Ex. 1 at 8 (col.1 ll.35-36); Jt. Ex. 7 at 11 (col.1 ll.17-20).) JPN ’901, a 
7 

dual-bevel miter saw that was also designed by Ushiwata, permits unobstructed 45° bevel cuts in 

both directions by moving the motor shaft upward from and perpendicular to the saw shaft, such 

that the motor shaft is parallel to the saw blade: 

(See Jt. Ex. 13 (Decl. of Shigeharu Ushiwata [“Ushiwata Decl.”]) ¶ 15; id., Ex. D at 9.)

The Board found that Ito and the AAPA described every aspect of the desktop cutting 

machine defined in Claim 1 of the Hitachi patent except for Elements 7 and 8.1 (See Board’s 

Decision at 12-13.) The Board then considered what a person of ordinary skill in the art would 

have learned from the combined teachings of either the AAPA or Ito, coupled with Johnson, 

Ambrosio, and Langworthy. (Id. at 14-15.) 

First, the Board concluded that both the AAPA and Ito’s discussion of prior art would 

have taught an ordinarily skilled person that the conventional single-bevel saw assembly would 

prevent users from making cuts at 45° to either side of “zero-tilt,” because on one side, the motor 

 1

 But as discussed below, the Court finds that the AAPA also teaches Element 7, a motor 

shaft that is parallel to and above the saw shaft. See infra Section II(C)(1). 
8 

housing would hit the surface of the workpiece or base, thus requiring a user to rotate the 

workpiece 180° in order to make a bevel cut in the opposite direction. (See Board’s Decision at 

15.) Next, an ordinarily skilled person would recognize that Ito’s solution to that problem 

requires turning the motor shaft upwards at an angle to the saw shaft and transmitting power to 

the saw shaft through angled beveled gears. (Id.) In addition, the hypothetical person of 

ordinary skill would learn that while JPN ’901’s placement of the motor shaft upwards from and 

perpendicular to the saw shaft similarly permits dual-beveling, it would also require an expensive 

multistage transmission system. (Id. at 15-16.) 

The Board then determined that Johnson teaches that a cutting machine whose motor 

shaft is parallel to the saw shaft could be used to make ±45° bevel cuts without hitting the 

workpiece or base and without rotating the workpiece. (Board’s Decision at 16.) The Board 

next considered Langworthy and found that it also disclosed parallel motor and saw shafts that 

were connected by transmission means and displaced by a least one blade radius. (Id. at 18.) 

Although Langworthy is a handheld surgical saw, it was found to teach that “[t]he saw may be of 

various sizes, [and the guard is also made in various sizes] complementary to the saw . . . and 

these elements may be changed at will, to adapt them for different uses,” and that the arm 

connecting the saw and motor could be manipulated “to attain cuts at various angles . . . with 

facility and accuracy in the operations.” (Id. at 19 (quoting Jt. Ex. 9 at 3 (col.3 ll.49-53, col.4 

ll.69-74)).) The Board also found that although Langworthy did not possess a base or other 

workpiece support, an ordinarily skilled person would have understood the human body to be 

Langworthy’s “workpiece,” and that because it would not be feasible or desirable to manipulate 

the patient’s body, the ability to make angled cuts would depend upon the ability to change the 

angle of the saw without obstruction by the body. (Id. at 17, 19.) Finally, the Board determined 
9 

that Ambrosio similarly would have taught a person of ordinary skill that unobstructed ±45° 

bevel cuts could be made without rotating the workpiece if the motor and saw shafts were 

parallel and displaced by at least one blade radius. (Id. at 19-20.) The Board found that “[i]n 

light of the combined prior art teachings, . . . persons having ordinary skill in the art would have 

had the instruction and the motivation to make and use a desk-top cutting machine having the 

design and/or construction claimed.” (Id. at 20.) Accordingly, the Board affirmed the 

Examiner’s rejection of Claim 1 as obvious and unpatentable. (Id. at 24.) 

On December 15, 2006, plaintiff requested rehearing, arguing that the Board 

misunderstood the teachings of Johnson with respect to its bevel-cutting capabilities and that 

Langworthy and Ambrosio were not analogous art. (See Jt. Ex. 15 (Hitachi’s Req. for Reh’g) at 

1-4.) On June 21, 2007, the Board denied rehearing and emphasized that the rejection of Claim 1 

was consistent with the Supreme Court’s intervening decision in KSR International Co. v. 

Teleflex Inc., 550 U.S. 398 (2007). (See Jt. Ex. 3 (Board Decision on Req. for Reh’g) at 4-6.) 

Thereafter, on August 21, 2007, plaintiff brought suit pursuant to 35 U.S.C. § 145, requesting 

that this Court reverse the decision of the Board and find that Hitachi is entitled to reissuance of 

its patent for the invention set forth in Claim 1. [See Dkt. No. 1.] On December 19, 2007, 

defendant filed a motion for summary judgment seeking affirmance of the Board’s decision as 

supported by substantial evidence. [See Dkt. No. 7.] On February 13, 2008, plaintiff filed a 

cross-motion for summary judgment, supported by several new witness declarations that 

explained why Claim 1 was not obvious and that addressed “secondary considerations” of nonobviousness (i.e., the commercial success of plaintiff’s design, its copying by competitors, and 

the fact that it filled a long-felt but unmet need). [See Dkt. No. 12.] On May 29, 2008, this 

Court denied the cross-motions and permitted plaintiff to submit the declarations insofar as they 
10 

related to issues previously presented to the PTO, but excluded evidence of the secondary 

considerations of commercial success and copying because they had not been raised before the 

PTO. Hitachi I, 556 F. Supp. 2d at 47-48 & n.3, 49. The Court also allowed the parties to 

conduct discovery regarding obviousness and permitted the PTO to introduce expert testimony to 

rebut plaintiff’s experts. See id. at 48 n.4. 

The Court then conducted a bench trial on April 23 and 24, 2009. At the outset, the 

Court permitted Hitachi to introduce new evidence of the secondary consideration of “long-felt 

but unsolved need,” denying defendant’s motion to strike such evidence on the grounds that the 

issue had been expressly considered by the PTO. (See Examiner’s Decision at 10 (“Applicant 

argues that motivation to pivot 45° both ways was known for years and yet the only solution was 

the overly expensive Ito ’834, and therefor[e] the current solution is unobvious. However, 

Applicant has not proven this to be a longstanding problem that others (different assignees) have 

failed at.”).) The Court then heard testimony from three witnesses.2

 Plaintiff’s witness Gary 

Katz, an expert in the field of finish carpentry,3 testified that the Hitachi design met a long-felt 

need among carpenters, because it enabled them to make bevel cuts in opposite directions on a 

workpiece without having to “helicopter” it (i.e., rotate it 180°) or flip it over onto its face. (See 

generally Trial Tr. [“Tr.”] at 24-70, 339-41; Jt. Ex. 12 (Decl. of Gary Katz [“Katz Decl.”]) ¶ 10.) 

Plaintiff’s witness Paul Hatch, an expert in the field of power tool design, testified about the 

prior state of the art with respect to miter saws, the features of the Hitachi invention, the 

 2

 In addition, the Court admitted into evidence the declarations of Gary Katz, Paul Hatch, 

Michael Gililland, and Ushiwata, who explained the problems he observed in connection with 

prior art saws and which he attempted to solve with his invention (see Ushiwata Decl. ¶¶ 10-16), 

as well as a computer-assisted drafting (CAD) presentation that Hatch created to “represent[] 

[his] closest interpretation of the device described by the Johnson patent” and what it teaches. 

(Hatch Decl. at 9; see Pl.’s. Ex. 19.) 

3

 Finish carpentry deals with the trim that goes into a home after the drywall is complete, 

such as the crown molding where the walls meet the floor or ceiling. (Tr. at 25:3-8 (Katz).) 
11 

teachings of the relevant prior art references, and the fact that a person of ordinary skill in the art 

would have had no reason to combine those teachings. (See generally Tr. at 72-190, 342-52.) 

Defendant’s witness Michael Gililland, an expert in the field of power tool design, offered 

testimony rebutting Hatch and Katz, expounding upon the teachings of the prior art and 

explaining that an ordinarily skilled person would have had sufficient reason to combine those 

teachings. (See generally id. at 220-339.) 

Applying the legal standards set forth below to this evidence and to the record before the 

Board, and considering the arguments and pleadings of counsel, the Court makes the following 

findings of fact and conclusions of law: 

ANALYSIS

I. LEGAL STANDARDS 

A. Judicial Review Under 35 U.S.C. § 145 

“A patent applicant may challenge a decision of the Board by either appealing directly to 

the United States Court of Appeals for the Federal Circuit, by way of 35 U.S.C. § 141, or by 

filing a civil action to obtain a patent in the United States District Court for the District of 

Columbia, by way of 35 U.S.C. § 145.” Putman v. Dudas, 539 F. Supp. 2d 414, 418 (D.D.C. 

2008). Plaintiff chose the latter approach. Section 145 provides that this Court “may adjudge 

that [plaintiff] is entitled to receive a patent for [its] invention, as specified in any of [its] claims 

involved in the decision of the Board of Patent Appeals and Interferences, as the facts in the case 

may appear . . . .” 35 U.S.C. § 145. This provision gives the Court “the power to set aside any 

ruling refusing a patent,” Mazzari v. Rogan, 323 F.3d 1000, 1004 (Fed. Cir. 2003), and 

determine patentability de novo. See Newman v. Quigg, 877 F.2d 1575, 1579 (Fed. Cir. 1989). 

“The ‘thrust’ of the action ‘is that the decision of the board is erroneous on the facts, the law, or 
12 

both,’” and is “‘in essence a suit to set aside the final decision of the board, like the bill in equity 

from which it was derived.’” Putman, 539 F. Supp. 2d at 418-19 (quoting Fregeau v. 

Mossinghoff, 776 F.2d 1034, 1037 (Fed. Cir. 1985) (emphasis in original)). 

An action under § 145 is a hybrid of an appeal and a trial de novo. Hitachi I, 556 F. 

Supp. 2d at 46. It is not a conventional appeal of an agency action because although “the record 

before the [PTO] is the evidentiary nucleus,” Fregeau, 776 F.2d at 1037, “the Court is not 

confined to the administrative record,” Putman, 539 F. Supp. 2d at 419, and plaintiff may 

“present to the court evidence that the applicant did not present to the PTO.” Dickinson v. Zurko, 

527 U.S. 150, 164 (1999) (citation omitted); see also Mazzari, 323 F.3d at 1004. However, 

because plaintiff may not raise new issues that were not presented to the Examiner or the Board, 

see Hyatt v. Dudas, No. 03-CV-0901, 2005 WL 5569663, at *5 (D.D.C. Sept. 30, 2005) (citing 

DeSeversky v. Brenner, 424 F.2d 857, 858 (D.C. Cir. 1970)), the Court “may only evaluate ‘new’ 

evidence if it supplements issues raised previously before the PTO.” MacKay v. Quigg, 641 F. 

Supp. 567, 569 (D.D.C. 1986) (citation omitted). The Court makes “de novo factual findings” 

where plaintiff presents new evidence that conflicts with particular findings of the Board, while 

applying the more deferential “substantial evidence” standard of review to the Board’s 

unchallenged findings. Hyatt, 2005 WL 5569663, at *3 (quoting Mazzari, 323 F.3d at 1005). 

Here, Hitachi’s new evidence challenges the Board’s obviousness determination. 

“Obviousness is a question of law with underpinning factual findings.” Mazzari, 323 F.3d at 

1005. Accordingly, “the Court need not defer” to the PTO’s obviousness determination and “is 

instead free to make an independent determination as to the legal conclusions and inferences to 

be drawn from the facts.” Radix Corp. v. Samuels, 13 U.S.P.Q.2d 1689, 1691 (D.D.C. 1989) 

(citing Stevenson v. Int’l Trade Comm’n, 612 F.2d 546, 549 (C.C.P.A. 1979)). 
13 

B. “Obviousness” Under 35 U.S.C. § 103(a) 

“[T]he federal patent power stems from a specific constitutional provision which 

authorizes the Congress ‘To promote the Progress of . . . useful Arts, by securing for limited 

Times to . . . Inventors the exclusive Right to their . . . Discoveries.’” Graham v. John Deere Co. 

of Kansas City, 383 U.S. 1, 5 (1966) (quoting U.S. Const., Art. I, § 8, cl. 8). This authority may 

not be used to “enlarge the patent monopoly without regard to the innovation, advancement or 

social benefit gained thereby,” id. at 6, because “granting patent protection to advances that 

would occur in the ordinary course without real innovation retards progress.” KSR, 550 U.S. at 

419; see also In re Kubin, 561 F.3d 1351, 1361 (Fed. Cir. 2009). “Were it otherwise patents 

might stifle, rather than promote, the progress of useful arts.” KSR, 550 U.S. at 427. In order to 

“weed[] out those inventions which would not be disclosed or devised but for the inducement of 

a patent,” courts long ago developed a requirement that patentable subject matter must possess a 

degree of “invention” that exhibited “‘more ingenuity and skill . . . than were possessed by an 

ordinary mechanic acquainted with the business . . . .’” Graham, 383 U.S. at 11 (quoting 

Hotckiss v. Greenwood, 52 U.S. (11 How.) 248, 267 (1851)). 

In 1952, Congress codified this criterion in 35 U.S.C. § 103, which requires that 

patentable subject matter be “non-obvious.” The statute now provides that “[a] patent may not 

be obtained . . . if the differences between the subject matter sought to be patented and the prior 

art are such that the subject matter as a whole would have been obvious at the time the invention 

was made to a person having ordinary skill in the art to which said subject matter pertains.” 35 

U.S.C. § 103(a). The non-obviousness requirement “creates a ‘patent-free’ zone around the state 

of the art, allowing skilled technicians to complete routine work such as the straightforward 

substitution of materials, the ordinary streamlining of parts and technical processes, and the usual 
14 

marginal improvements which occur as a technology matures.” Roger E. Schechter & John R. 

Thomas, Intellectual Property: The Law of Copyrights, Patents and Trademarks § 17.1 (2003). 

 “Ultimately, the question to be determined by this Court is whether the claimed 

invention can be said to have been obvious to one of ordinary skill in the art.” Radix, U.S.P.Q.2d 

at 1692 (citing Stratoflex, Inc. v. Aeroquip Corp., 713 F.2d 1530, 1538 (Fed. Cir. 1983)). Where, 

as here, “the question is whether a patent claiming the combination of elements of prior art is 

obvious,” courts must consider “whether the improvement is more than the predictable use of 

prior art elements according to their established functions.” KSR, 550 U.S. at 417; see also 

Monolithic Power Sys., Inc. v. O2 Micro Int’l Ltd., 558 F.3d 1341, 1352 (Fed. Cir. 2009). 

“[W]hen a patent ‘simply arranges old elements with each performing the same function it had 

been known to perform’ and yields no more than one would expect from such an arrangement, 

the combination is obvious.” KSR, 550 U.S. at 417 (quoting Sakraida v. AG Pro, Inc., 425 U.S. 

273, 282 (1976)). 

To determine obviousness, the Court must examine (1) the level of ordinary skill in the 

pertinent art, (2) the scope and content of the prior art, (3) the differences between the prior art 

and the claims at issue, and (4) whether any “secondary considerations” such as “commercial 

success, long felt but unsolved needs, [or] failure of others” might provide objective evidence of 

non-obviousness by shedding light upon “the circumstances surrounding the origin of the subject 

matter sought to be patented.” KSR, 550 U.S. at 406 (quoting Graham, 383 U.S. at 17-18). In 

addition, the Court must “determine whether there was an apparent reason to combine the known 

elements in the fashion claimed by the patent at issue,” by examining the “interrelated teachings 

of multiple patents; the effects of demands known to the design community or present in the 

marketplace; and the background knowledge possessed by a person having ordinary skill in the 
15 

art . . . .” Id. at 418; In re Gartside, 203 F.3d 1305, 1316 (Fed. Cir. 2000) (“The presence or 

absence of a motivation to combine references . . . is a pure question of fact.”). “The perspective 

from which these findings are made . . . is that of a person of ordinary skill in the field of 

invention,” Glaverbel Societe Anonyme v. Northlake Mktg. & Supply, Inc., 45 F.3d 1550, 

1555 (Fed. Cir. 1995), who is presumed to have knowledge of all “pertinent prior art.” In re 

Carlson, 983 F.2d 1032, 1038 (Fed. Cir. 1992). If the Court concludes that the claimed subject 

matter was obvious, the patent claim is invalid under § 103. KSR, 550 U.S. at 407. 

II. FINDINGS OF FACT 

A. The Level of Ordinary Skill in the Pertinent Art 

At the time Hitachi’s invention was made, a person of ordinary skill in the art would have 

been either a mechanical engineer (or equivalent) having at least 5 years of experience designing 

power tools, or someone having technical training and 10 years of experience designing power 

tools. The parties are in substantial agreement as to this definition. (See Ushiwata Decl. ¶ 9 

(offering this definition); Jt. Ex. 17 (Decl. of Michael Gililland [“Gililland Decl.”]) ¶ 10 

(embracing Ushiwata’s definition); see also Hatch Decl. at 5 ¶ 12 (proposing similar definition).) 

B. The Scope of the Prior Art 

The scope of the prior art encompasses those references that are “analogous to the 

claimed invention.” In re Bigio, 381 F.3d 1320, 1325 (Fed. Cir. 2004). “Common sense teaches 

. . . that familiar items may have obvious uses beyond their primary purposes, and in many cases 

a person of ordinary skill will be able to fit the teachings of multiple patents together like pieces 

of a puzzle.” KSR, 550 U.S. at 420. In fact, it would be error to “assume[e] that a person of 

ordinary skill attempting to solve a problem will be led only to those elements of prior art 

designed to solve the same problem.” Id. Accordingly, one test for analogous art is “whether the 

art is from the same field of endeavor, regardless of the problem addressed . . . .” Bigio, 381 
16 

F.3d at 1325. Where a potential reference “is not within the field of the inventor’s endeavor,” it 

may still be analogous art if it is “reasonably pertinent to the particular problem with which the 

inventor is involved.” Id.4

1. The AAPA and Ito are prior art. 

By definition, the AAPA is the ’294 patentee’s own proffer of prior art. (See also Tr. at 

119:12-25 (Hatch).) Hitachi’s counsel also acknowledged that Ito is prior art. (See id. at 356:10-

13.) 

2. Johnson and Ambrosio are prior art because they are from the same 

field of endeavor as Hitachi’s device. 

The ’294 patent describes the “[f]ield of the [i]nvention” as relating to “a desk-top cutting 

machine whose saw can be tilted rightward and leftward relative to the top of the base of the 

machine.” (Jt. Ex. 1 at 8 (col.1 ll. 6-9).) However, the patentee’s narrow view of the relevant 

field does not necessarily define the prior art’s scope. The field of endeavor can be correctly 

determined “by consulting the structure and function of the claimed invention as perceived by 

one of ordinary skill in the art” with “reference to explanations of the invention’s subject matter 

in the patent application . . . .” Bigio, 381 F.3d at 1325-26. 

The ’294 patent’s description of the prior art and its proposed solutions to those problems 

shed light on the relevant aspects of the design’s structure and function. The patent explains that 

the prior art includes the AAPA, which enables 45° bevel-cutting in one direction and whose 

motor and saw shafts are “disposed in parallel” and connected through “toothed engagement,” 

 4

 JPN ’901 is cited by the ’294 patent and by Ito as a foreign patent “reference” and 

discussed during their review of the prior art. (Jt. Ex. 1 at 1, 8 (col.1 ll.35-36); Jt. Ex. 7 at 1, 12 

(col.1 ll.18-19).) At trial, plaintiff’s counsel agreed that JPN ’901 constitutes prior art. (See Tr. 

at 108:5-9; see also id. at 356:2-9.) However, neither the Examiner nor the Board considered 

JPN ’901 as prior art for purposes of rejecting Hitachi’s patent as obvious. (See Board’s 

Decision at 24; Jt. Ex. 16 (Examiner’s Answer) at 11.) Therefore, the Court will not rely on JPN 

’901 as prior art for purposes of evaluating the non-obviousness of Claim 1. 
17 

and JPN ’901, which possesses a “tiltable circular saw assembly” that permits ±45° bevel cuts 

but uses a perpendicular motor and saw shaft design and therefore suffers from various 

inefficiencies. (See Jt. Ex. 1 at 8 (col.1 ll.10-49).) The ’294 patent then addresses the perceived 

inadequacies of both the AAPA and JPN ’901 by proposing a saw assembly whose motor shaft is 

similarly “disposed in parallel with” the saw shaft but also displaced from the motor shaft by at 

least one blade radius, in order to permit bevel cuts in both directions with a less costly and more 

accurate design. (See id. at 8 (col.2 ll.5-13), 9 (col.3 ll.65-67).) 

In light of the Hitachi device’s structure and function, the Court finds that “[c]ommon 

sense” would have guided the ordinarily skilled person to consider other tiltable motorized 

devices used to cut construction materials and to “fit [their] teachings . . . together like pieces of 

a puzzle.” KSR, 550 U.S. at 420. Johnson’s “multiple angle cutting apparatus” and Ambrosio’s 

“tilting table saw” employ structures that are similar to Hitachi’s device in order to serve similar 

functions: each possesses a motorized saw assembly with parallel motor and saw shafts displaced 

by at least one blade radius, the saw assembly is fixed to a structure that also supports a 

workpiece, and the saw can be tilted relative to the workpiece in order to make bevel cuts. A 

person of ordinary skill in the art would view Johnson, Ambrosio, and Hitachi’s device as 

belonging to the same field of endeavor, thus making Johnson and Ambrosio prior art.5

 See 

Bigio, 381 F.3d at 1326 (affirming Board’s finding that prior art toothbrush was in same field of 

endeavor as patentee’s hairbrush where Board concluded that “the structural similarities between 

toothbrushes and small brushes for hair would have led one of ordinary skill in the art working in 

 5

 In the alternative, even if Johnson and Ambrosio are not from the same field of 

endeavor as Hitachi’s device, the Court finds that they are still analogous art because, for the 

reasons Gililland offered (see Tr. at 266:16-270:24, 287:20-288:10), they are “reasonably 

pertinent” to the problem addressed by Hitachi’s device. Bigio, 381 F.3d at 1325. See infra 

Section II(B)(3). 
18 

the specific field of hairbrushes to consider all similar brushes including toothbrushes”).

3. Langworthy is prior art because it is reasonably pertinent to the 

particular problems addressed by Hitachi’s device. 

“A reference is reasonably pertinent if, even though it may be in a different field from 

that of the inventor’s endeavor, it is one which, because of the matter with which it deals, 

logically would have commended itself to an inventor’s attention in considering his problem.” 

In re ICON Health and Fitness, Inc., 496 F.3d 1374, 1379-80 (Fed. Cir. 2007) (quoting In re 

Clay, 966 F.2d 656, 659 (Fed. Cir. 1992)); see, e.g., In re Paulsen, 30 F.3d 1475, 1481-82 (Fed. 

Cir. 1994) (finding that hinges, latches, and springs for piano lids, furniture cabinets, and audio 

cassette holders were relevant prior art for patentee’s hinge and latch mechanism for connecting 

laptop computer’s screen to rest of computer). Where an inventor is considering how to design a 

particular mechanism to fit a specific type of device, he “would naturally look to references 

employing” other forms of that mechanism, even where they are found in different types of 

devices. ICON Health and Fitness, 496 F.3d at 1380 (discussing Paulsen, 30 F.3d 1475). 

The Court finds that “given the nature of the problems confronted by the inventor[] [of 

Hitachi’s device], one of ordinarily skill in the art would have consulted the mechanical arts for” 

motorized circular saw assemblies more generally. Paulsen, 30 F.3d at 1482; see ICON Health 

and Fitness, 496 F.3d at 1380 (“Analogous art to Icon’s application [for a treadmill], when 

considering the [folding mechanism at issue and means of maintaining a folded position], may 

come from any area describing hinges, springs, latches, counterweights, or other similar 

mechanisms – such as the folding bed in [an earlier reference].”). Ushiwata sought to configure 

the ’294 patent’s saw assembly in view of the limitations of the AAPA’s saw assembly, which 

does not permit unobstructed 45° bevel cuts in both directions, and JPN ’901’s multistage 

beveled-gear transmission, which he deemed to be too complicated and costly. (See Jt. Ex. 1 at 
19 

8.) The Hitachi design thus generally addresses the problem of how to displace the motor shaft 

from the saw shaft so that the user can make a variety of unobstructed angled cuts, while 

simplifying the transmission to minimize cost and maximize accuracy. “Nothing about 

[Hitachi’s saw assembly] requires any particular focus on” desktop cutting machines, ICON 

Health and Fitness, 496 F.3d at 1380, because “[t]he problems encountered by the inventors of 

the [’294] patent were problems that were not unique to” desktop cutting machines or “the 

particular environment” in which they are presented. Paulsen, 30 F.3d at 1481. 

Langworthy evinces a similar concern for displacing the motor shaft from the saw shaft 

in order to maximize the “accuracy and precision” of potential styles and angles of cuts. (See Jt. 

Ex. 9 at 2 (col.1 ll.9-30).) Langworthy’s “primary object” is to be “comparatively simple in 

construction and operation and composed of a minimum number of parts . . . .” (Id.; see also Tr. 

at 329:25-330:4 (Gililland).) Langworthy’s saw assembly consists of a sterilizable blade and 

saw shaft fixed to one end of a flat tubular arm that encases the transmission means; the other 

end of the arm is attached to (and can detach from) the motor, which is unsterilized but can be 

covered in a sterilized bag. (Jt. Ex. 9 at 2-3 (col.2 l.70 - col.3 l.20.) Because the arm displaces 

the motor shaft from the saw shaft, the user can hold the arm and wield the device to “attain cuts 

at various angles . . . with facility and accuracy in the operations.” (Id. at 3 (col.4 ll.69-74).) 

Langworthy thus falls within “[t]he scope of the prior art” because its parallel but displaced 

shafts and simplified transmission system are “‘reasonably pertinent to the particular problem 

with which [Hitachi’s] invention was involved.’” Ruiz v. A.B. Chance Co., 234 F.3d 654, 

664 (Fed. Cir. 2000) (quoting Stratoflex, 713 F.2d at 1535).6

 6

 Hatch conceded that surgical devices were not per se irrelevant to the problems 

considered by Ushiwata, but he rejected the relevance of Langworthy in particular. (See Tr. 

142:14-20 (Q: “As one with ordinary skill in the art, would a patent describing a device such as 

this, have relevance to you in designing a miter saw?” A: “This one doesn’t. I won’t rule out 
20 

C. The Content of the Prior Art 

“The prior art is relevant for all it contains, including what it fairly suggests to one of 

ordinary skill in the art.” Markman, 987 F. Supp. at 32. The teachings of earlier patents are 

therefore not limited to the “teaching[s] of the specific embodiment recited,” In re Fracalossi, 

681 F.2d 792, 794 n.1 (C.C.P.A. 1982), because even patents for “obsolete technology” can be 

considered for what they “disclose[] in relation to the claimed invention.” In re Young, 927 F.2d 

588, 591 (Fed. Cir. 1991)). The Court finds that the AAPA or Ito, in conjunction with any one of 

Johnson, Ambrosio, or Langworthy, teach every element of Claim 1 of the ’294 patent. 

1. The AAPA 

As described in the ’294 patent, the AAPA is a “conventional desk-top cutting machine” 

with a circular saw assembly whose shaft is connected “through toothed engagement” to and 

“disposed in parallel with” the motor shaft, such that the motor projects out from the center of 

the blade. (See Jt. Ex. 1 at 5 (figs.6 & 7), 8 (col.1 ll.11-33).) The saw assembly is mounted on a 

holder, which is in turn attached to a base that supports the workpiece to be cut. (See id.) The 

AAPA teaches that while the holder can be tilted leftward in order to make “left-hand” bevel cuts 

at a 45° angle, the structure of the saw assembly only permits a rightward 20° or 30° tilt, at 

which point the motor housing would hit the base. (See id.; see also Pl.’s Dec. 22, 2008 

 

surgical operators as such because of that reason, but there is very little that I can, as one skilled 

in the art at the time, really draw from this.”). The Court must reject Hatch’s conclusion that 

Langworthy is not prior art to the extent it was premised upon the relatively small scale of 

Langworthy’s design and function. (See id. at 142:4-12 (noting that Langworthy “talks about 

incisions” and is “dealing with an entirely different type of cut, user, or procedure. . . . [I]t’s 

described as a device that’s held like a pen. So, that would lead me to think it is a very small 

item for doing small cuts, and not chopping things off, of course.”) As a matter of law, a 

disparity in size or scale of function is not automatically disqualifying when considering the prior 

art’s scope. See, e.g., Paulsen, 30 F.3d at 1482 (hinges on audio cassette holders and piano lids 

were pertinent to problem of how to hinge laptop computer screens); see also Bigio, 381 F.3d at 

1326 (toothbrush was prior art for hairbrush). 
21 

Statement of Material Facts [“Pl.’s Pretrial Facts”] [Dkt. No. 35] ¶ 10 (“The AAPA saw is not 

capable of making ±45° bevel cuts[;] instead the AAPA, when ti[lt]ed in the clockwise direction, 

can only move 20 or 30 degrees.”).) In order to obtain 45° cuts in opposite directions, the 

workpiece must be rotated. (Jt. Ex. 1 at 8.) 

The Court finds that the Hitachi patent’s own description and depictions of the AAPA in 

Figures 6 and 7 demonstrate that the patentee viewed the AAPA as teaching Element 1 (a base 

supporting a workpiece), Element 2 (a turntable within the base),7

 Element 3 (a holder supported 

by the turntable for tilting in opposite directions),8 Element 4 (a circular saw blade), Element 5 (a 

saw shaft that can be pivoted downward into the workpiece), and Element 6 (a saw assembly 

with a covered motor). (See Jt. Ex. 1 at 5 (figs.6 & 7) (labeling parts with same numbers as those 

used to label Hitachi device in Figures 1 and 2); see also Tr. at 237:4-240:8 (Gililland).) The 

Court also credits Gililland’s testimony that the ’294 patent’s description and illustrations of the 

 7

 Plaintiff’s pretrial statement of facts erroneously asserted that Gililland testified at his 

deposition that the AAPA “does not disclose” Element 2’s turntable in the base. (Pl.’s Pretrial 

Facts ¶ 8 (citing Oct. 31, 2008 Gililland Dep. [“Gililland Dep.”] at 134:17-21, attached as Ex. 1 

to Pl.’s Pretrial Facts).) The section cited by plaintiff does not state this, and Gililland in fact 

testified that the AAPA does indeed have a turntable in the base. (Gililland Dep. at 137:11-16; 

accord Tr. at 258:10-12 (“All miter saws have a base. All miter saws have a rotatable table. 

That’s what makes them a miter saw.”).) 

8

 Notwithstanding Gililland’s testimony that the AAPA only teaches 45° bevel cuts in 

one direction (see Tr. at 236:5-6, 251:21-23, 313:10-12), the Court notes that the ’294 patent 

expressly acknowledges (as did plaintiff) that the AAPA teaches the ability to tilt in both 

directions: leftward for a 45° bevel cut, but rightward for only a 20° or 30° bevel cut, after which 

point the AAPA’s motor housing hits the base. (See Jt. Ex. 1 at 8 (col.1 ll.19-27); see also Pl.’s 

Pretrial Facts ¶ 10.) The Court must credit the patentee’s own understanding of what the AAPA 

teaches, as the AAPA is not a real-world saw but rather a theoretical construct of whatever prior 

art teachings the patentee acknowledged. (See Tr. at 254:3-5 (Hitachi’s counsel: “[The] AAPA 

is . . . [F]igure 6 and 7 and lines of text. It totals 225 words. It’s not that saw [i.e., plaintiff’s 

Demonstrative Exhibit 15, a previously commercially available single-bevel saw].”); see also id. 

at 236:18-20 (Gililland: “[Figure 7 of the ’294 patent] is a construct that doesn’t actually exist.”) 
22 

AAPA disclose Element 7, a motor shaft parallel to and above the saw shaft.9

 (Tr. at 240:10-

241:4.) Not only does the ’294 patent state that the shafts are parallel, but it also depicts the 

motor shaft as placed above the saw shaft. (See Jt. Ex. 1 at 5 (figs.6 & 7, items 9 & 12); see also 

Tr. at 164-65 (Hatch’s affirmation that Figure 7 depicts AAPA’s motor and saw shafts as 

described in prior art discussion).) Therefore, the Court finds that the AAPA teaches Element 7. 

2. Ito 

Ito discloses a desktop miter saw that can tilt 45° in opposite directions to make bevel 

cuts. (See Jt. Ex. 7 at 14-15 (Claims).) Like the AAPA, Ito claims a saw assembly attached to a 

tiltable holder, which is in turn attached to a base that supports the workpiece. (See Jt. Ex. 7 at 5 

(fig.4), 11-12.) That base contains a turntable so the user can rotate the workpiece for miter cuts. 

(See id. at 11.) Ito’s motor is turned upward at a 45° angle relative to the saw blade and 

transmits power to the saw shaft through beveled gears, permitting unobstructed 45° bevel cuts 

in both directions. (Id. at 14-15.) Ito thus teaches that it is possible to achieve 45° bevel cuts in 

both directions by moving the motor shaft upward from the base so that it will not abut the 

workpiece or base when the saw is tilted. 

In addition, Ito teaches that when moving the motor shaft upward, it is not desirable to 

place the motor shaft perpendicular to the saw shaft in the manner of JPN ’901. Ito cites JPN 

’901 as prior art and discusses how JPN ’901 permits unobstructed dual-beveling by raising the 

motor shaft “laterally and upwardly” out of the way of the saw blade, so that the motor shaft is 

perpendicular to the saw shaft (and thus parallel to the saw blade). (Jt. Ex. 7 at 11 (col.1 ll.17-

 9

 As Gililland explained, Element 7 only defines the motor shaft in Hitachi’s device as 

parallel to and above the saw shaft, and does not define any specific displacement between them. 

(Tr. at 247:22-248:17.) Rather, Element 8 specifies the required displacement as at least one 

blade radius. (Id. at 242:23-243:3.) In other words, “Element 7 says ‘above’; [E]lement 8 sa[ys] 

‘how much above.’” (Id. at 251:3-4.) Hitachi provided nothing that undercut Gililland’s 

conclusion that the AAPA teaches Element 7. 
23 

31).) Ito concludes that JPN ’901’s design is non-optimal because it employs a “multistage” gear 

train to transmit power to the saw shaft, which increases the complexity, cost, and size of the 

saw. (Id.) 

The Court credits Gililland’s testimony that Ito teaches Elements 1, 2, 3, 4, 5, and 6 of 

Claim 1 of the ’294 patent, as well as those portions of Element 8 that describe both a means of 

transmission between the motor and saw shafts and the ability to tilt 45° in either direction 

without obstruction. (See Tr. at 258:8-262:5; see also Pl.’s Pretrial Facts ¶ 11 (“The saw 

disclosed in Ito is already capable of making ±45° bevel cuts.”).) 

3. Johnson 

Johnson discloses a multiple-angle cutting machine that computerizes the process of 

cutting and shaping the ends of “extrusions,” such as tubing, that are automatically fed into 

cutting position by means of a “stock feed and orienting mechanism” on the machine’s left side 

and a workpiece “handling mechanism” on its right. (See Jt. Ex. 8 at 2 (fig.1, items 13 & 15), 15 

(col.1 ll.5-11), 18 (col.7 l.50 - col.8 l.56).) Cutting angles and other instructions are programmed 

in advance; once the operator “initiates automatic cutting by pushing the start button,” all that 

remains to be done is to “observe[] the apparatus for proper operation, off load[] parts[,] and 

load[] additional extrusions or stock as needed.” (Id. at 18 (col.8 ll.6-14).) 

The shaft of Johnson’s circular saw is connected by drive train to a motor shaft placed in 

parallel with and above the saw shaft. (See Jt. Ex. 8 at 2 (fig.1), 17 (col.5 ll.52-55); see also Tr. 

at 266:22-25 (Gililland); Hatch Decl. at 8-10 (recreating Johnson’s saw assembly structure in 

CAD diagram); Pl.’s Ex. 19 (CAD presentation).) The saw assembly rests at the end of a 

horizontal hydraulic arm which is itself mounted atop a vertical hydraulic arm; unlike Hitachi’s 

saw, which pivots downward when cutting, Johnson’s saw moves into cutting position through 

the contraction or expansion of the hydraulic arms. (See Jt. Ex. 8 at 17 (col.5 ll.49-59).) These 
24 

hydraulic arms are part of a “cutting member positioning mechanism” that can rotate and tilt the 

saw in arcs centered on a single “point of cut.” (Id. (col.5 ll.60-68).) The “angular orientation of 

the cutting member” is “selectably controllable” by a motor that can, among other things, “rotate 

[the] cutting member” around “a horizontal center line which passes through the point of cut.” 

(Id.) This would move the saw along a semicircular track that defines the “vertical-tiltable travel 

path,” corresponding to the tilting capability necessary for bevel cuts. (Id. at 15 (col.2 ll.5-6); 

see also Gililland Decl. ¶ 24.) Although the workpiece handling mechanism can also rotate the 

workpiece to achieve finer adjustments to the miter-cutting capability (see Jt. Ex. 8 at 18 (col.7 

ll.4-12)), the saw assembly’s positioning mechanism is the only structure capable of tilting for 

bevel cuts. (See id. at 3 (figs.2 & 3 (showing angle B)); Hatch Decl. at 10 ¶ 1 (“[O]nly axis [i.e., 

angle] B refers directly to beveling.”).) 

Hitachi did not appear to dispute that Johnson teaches the ability to tilt the saw assembly 

45° in either direction. The text speaks generally about the “±45° capability of the cutting 

member positioning mechanism” (Jt. Ex. 8 at 17 (col.5 ll.14-15); see also id. at 18 (col.7 ll.11-

12)), and it repeatedly describes the ability to tilt the saw without any reference to limits upon 

that ability. (See id. at 1 (Abstract), 15 (col.2 ll.5-6), 16 (col.4 ll.56-64), 17 (col.5 ll.61-65), 19 

(Claims).) Hatch conceded that “there is plenty of room” for Johnson’s saw assembly to tilt in 

either direction. (See Tr. at 186:18-187:1; see also Hatch Decl. at 10 ¶ 2.) 

However, the parties disputed whether Johnson teaches the ability to cut while tilted 45° 

in either direction. The Court finds that Johnson so teaches. The Court credits Gililland’s 

testimony that despite the text’s reference to the ±45° positioning capability during a broader 

discussion of miter rotation, the patent makes no distinction in how it describes and depicts the 

mitering and beveling angles of rotation and their related structures. (See Tr. at 272:7-10 
25 

(“[Johnson] uses the same language to describe the rotation about the axes [i.e., angles] B [bevel] 

and C [miter]. And he demonstrates in his drawings the same kinds of structure. So, I don’t read 

any limitation on the bevel angle that’s not there for the miter angle.”); id. at 317:24-318:12.) 

For example, Figure 1 depicts the semicircular track that defines the “vertical-tiltable travel path” 

for bevel cutting as Item 49, and that structure extends in both directions from the saw’s zero-tilt 

position. (See Jt. Ex. 8 at 2 (fig.1), 17 (col.5 ll.61-65); see also Tr. at 270:2-24 (Gililland).) 

Plaintiff relies upon Hatch’s testimony and his CAD presentation to show that even 

though Johnson’s saw can tilt to make “left-hand” 45° bevel cuts, it cannot make cuts when tilted 

45° in the other direction. (See Hatch Decl. at 10 ¶ 2.) The Court is not persuaded. First, Hatch 

contends that the saw’s “gear and belt housing” – i.e., the housing for what the patent calls the 

“drive train” – “is far too large on the right hand side” to permit “right-hand” 45° bevel cuts, and 

that it would hit the workpiece or its handling mechanism when attempting to cut from a 45° 

rightward tilt. (Id.; see also Tr. at 186:11-187:8.) However, this conclusion about the relative 

sizes of the drive train’s housing, the saw blade, and the workpiece handling mechanism lacks a 

reliable basis in the patent. The specification discusses Johnson’s drive train only once in 

passing (see Jt. Ex. 8 at 17 (col.5 l.53)), and Hatch’s conclusion about the scale of the elements 

was “solely based on [Figure 1’s] image alone.” (Tr. at 182:15.) Yet it is improper – and 

potentially “misleading” (id. at 137:19-20 (Hatch)) – to infer scale solely from the patent’s 

illustrations, because “patent drawings do not define the precise proportions of the elements and 

may not be relied on to show particular sizes if,” as here, “the specification is completely silent 

on the issue.” Hockerson-Halberstadt, Inc. v. Avia Group Int’l., Inc., 222 F.3d 951, 956 (Fed. 

Cir. 2000).10 The Court thus cannot credit Hitachi’s argument because it impermissibly “hinges 

 10 Hatch in fact acknowledged that Figure 1 “is not entirely accurate to scale,” and that he 

had to adjust the position of certain components of Figure 1 when creating his CAD presentation 
26 

on an inference drawn from certain figures about the quantitative relationship” among the sizes 

of the saw assembly’s components and the workpiece handling mechanism. Id.

Second, Hitachi contends that Johnson’s ability to rotate a workpiece 180° by means of 

the handling mechanism is evidence of Johnson’s need to rotate the workpiece because it cannot 

tilt the saw 45° in both directions. (See Tr. at 380:3-4 (Hitachi’s counsel: “Whatever Johnson 

was trying to do with his device, he also had a flipping problem.”).) However, plaintiff assumes 

without basis that the handling mechanism’s rotational function is “an automated helicoptering 

system” (see id. at 380:4-13), referring to the “helicoptering” or “whirly-birding” workaround 

developed by users of single-bevel desktop saws to make bevel cuts in opposite directions. (See 

id. at 39:9-15 (Katz).) Just because users of a single-bevel desktop miter saw must rotate the 

workpiece, it does not necessarily follow that Johnson must be a single-bevel device simply 

because it enables workpiece rotation. (See Jt. Ex. 8 at 2 (fig.1, item 15), 18 (col.8 ll.40-42).) 

Rather, the handling mechanism’s function should be understood in light of Johnson’s intended 

purpose: to automate and consolidate the process of feeding and cutting the ends of workpieces 

(id. at 15 (col.1 ll.5-11), which was previously handled by different machines at different times. 

(Id. (col.1 ll.14-41).) Because Johnson’s saw is designed to rotate and tilt around a single point 

of cut, it is necessary to move both ends of each workpiece to that point in order to cut them. 

First, the handling mechanism receives each new piece of stock as it is fed into the machine, 

clamps the workpiece while it is cut to the desired length, and continues to secure it while the 

newly created free end is shaped by the saw assembly at a pre-programmed angle. (See id. at 18 

 

so that they would reflect the specifications in Johnson’s text and other illustrations. (Id. at 

183:20-24; Hatch Decl. at 8-9.) Gililland also testified that “[i]f you were to move [the saw 

assembly] on that CAD drawing to a right 45[° miter position], you would also have an 

interference. Yet, [Johnson] clearly says in the patent that it can do a [±]45[° miter cut].” (Tr. at 

271:7-19.) 
27 

(col.8 ll.15-56).) Next, the handling mechanism rotates the unshaped end into place at the point 

of cut and makes other angular adjustments as desired. (Id.) Once that other end has been cut, 

the finished workpiece is rotated back into its starting orientation, so that it can be pushed out by 

a new piece of stock that feeds automatically into the machine. (Id.) Nothing in the patent 

suggests that these automated functions and the need to move each end of the workpiece to the 

point of cut are mutually exclusive of the saw’s ability to tilt and cut 45° in either direction at 

that point of cut. 

However, even if plaintiff were correct that the size of Johnson’s saw assembly elements 

relative to the handling mechanism would not permit right-hand 45° bevel cuts, Johnson’s 

teachings are not limited to “the specific embodiment recited.” Fracalossi, 681 F.2d at 794 n.1. 

Because “[a] person of ordinary skill is also a person of ordinary creativity, not an automaton,” 

KSR, 550 U.S. at 421, he or she would have understood, for example, that the drive train could 

be made smaller relative to the handling mechanism. (See also Gililland Decl. ¶ 26.) Further, 

Gililland testified that the handling mechanism “doesn’t exist on a miter saw or on the desktop 

cutting machine of Ushiwata,” and is irrelevant “to the problem that is presenting itself to 

Ushiwata.” (Tr. at 278:2-4.) The ordinarily skilled person would have therefore recognized that 

the handling mechanism, which facilitates Johnson’s automated feeding and cutting, would be 

irrelevant when designing a manually operated dual-bevel desktop miter saw, such that there 

would be no need to incorporate the potentially obstructive handling mechanism. Accordingly, 

Johnson’s teaching of how to tilt 45° in either direction would have remained applicable to the 

design of a dual-bevel desktop saw. 

Turning to the specific elements of Claim 1 of the ’294 patent, the Court finds that 

Johnson describes Element 1 insofar as it possesses a mechanism that supports the workpiece in 
28 

the manner of a “base.” The Court also credits Gililland’s testimony that Johnson teaches those 

portions of Element 3 that describe a structure that can tilt the saw assembly “transversely in 

opposite directions about a zero-tilt angle position” (see Tr. at 276:2-7), as well as Element 4, a 

circular saw blade, Element 6, a saw assembly with a covered motor, and Element 7, a motor 

shaft parallel to and above the saw shaft. (Id. at 276:2-3; see Jt. Ex. 8 at 2 (fig.1, items 41 & 43), 

17 (col.5 ll.53-55).) Finally, the Court credits Gililland’s testimony that Johnson teaches those 

portions of Element 8 which describe the displacement of the motor and saw shafts by at least 

one blade radius and their connection by transmission means, and which describe the saw 

assembly’s placement on a structure that permits tilting 45° in either direction without 

obstruction. (See Tr. at 266:22-267:2, 270:17-24, 275:10-20.)

4. Ambrosio 

Ambrosio discloses a tilting table saw with a “new and improved means for varying the 

angular position of the saw blade relative to the work supportable table.” (Jt. Ex. 10 at 4 (col.1 

ll.8-11). The motorized circular saw assembly is mounted underneath the table, with the blade 

fitting through a slot running through the center of the table’s length. (See id. at 1 (fig.1), 4 

(col.1 ll.62-72).) A pulley transmission connects the saw shaft to a motor shaft that is placed 

parallel to and below the saw shaft. (See id. at 1, 4 (col.2 ll.31-39).) The saw can be tilted to 

either side of its zero-tilt position, although the text does not specify the precise angle. (See id. at 

2 (fig.3, item 76), 5 (col.3 ll.53-55 (describing ability to move tilting knob “in either direction” 

as shown in illustration); Tr. at 330:24-25 (Gililland: “Ambrosio teaches us a way to make bevel 

cuts in both directions, but it does not give us an angle.”).)11

 11 Hitachi does not appear to dispute that Ambrosio can tilt in either direction. (See Pl.’s 

Feb. 13, 2008 Statement of Material Facts Not in Dispute in Supp. of Mot. for Summ J. [Dkt. 

No. 12-6] ¶ 40; cf. id. at 144:1-5 (Hatch’s testimony that Ambrosio does not teach how to make 

±45° cuts but does disclose ability to make some cuts).) 
29 

With respect to Claim 1 of the ’294 patent, the Court finds that Ambrosio teaches 

Element 1 because it claims a “base, [and] a horizontal work-supporting table fixed to said base” 

(Jt. Ex. 10 at 5 (col.4 ll.22-23)), and those portions of Element 3 which describe a means for 

tilting the saw “transversely in opposite directions.” (See Tr. at 288-89, 330:24-25 (Gililland).) 

Ambrosio also teaches Elements 4 and 6, because it possesses a circular saw assembly with a 

motor housing, and Element 7, to the extent that the motor and saw shafts are parallel and the 

saw shaft is interposed between the motor shaft and the cutting surface. (See Jt. Ex. 10 at 4 

(col.2 ll.31-39); Tr. at 291:2-10 (Gililland); cf. id. at 144:13-14 (Hatch’s testimony that 

Ambrosio “has a few of these elements, but not all”). Although Element 7 specifies that the 

motor shaft is above the saw shaft, Gililland persuasively explained that the term “above” should 

be understood in the context of a desktop saw, where the saw assembly is mounted over the 

cutting surface, such that a motor shaft “above” and parallel to the saw shaft simply means that 

the saw shaft is interposed between the motor shaft and the cutting surface. (Tr. at 291:11-17.) 

Where, as with Ambrosio’s table saw, the saw assembly is mounted below the cutting surface but 

its saw shaft is similarly interposed between the motor shaft and cutting surface, the Court finds 

that a person of ordinary skill would know to simply “flip everything upside down” for use in a 

desktop device. (Id.) Finally, the Court credits Gililland’s testimony that Ambrosio teaches 

those portions of Element 8 that describe how the motor and saw shafts are displaced by at least 

one blade radius and connected by transmission means, permitting the user to make unobstructed 

bevel cuts in either direction.12 (Id. at 290:1-8; 294:14.) 

 12 Although Ambrosio’s illustrations do not label every component identified in the text 

as relevant to the tilting of the blade, Gililland testified that the illustrations’ omissions are not 

relevant to his conclusion that Ambrosio can bevel in both directions. (See Tr. at 333:12-

334:21.) Even if the omissions were relevant, the Court finds that the text is sufficiently specific 

for one familiar with geometry (let alone one ordinarily skilled in the art) to discern the 

components’ locations. (See Jt. Ex. 10 at 5 (col.3 ll.24-49).) 
30 

5. Langworthy 

As discussed, see supra Section II(B)(3), Langworthy discloses a motorized surgical saw 

that can be used to make a variety of cuts at various angles. (See generally Jt. Ex. 9 at 2-3.) It 

also teaches that the placement of the motor and saw shafts in parallel with each other, and their 

connection through transmission means, requires “a minimum number of parts” and permits 

“comparatively simple [] construction and operation . . . .” (Id. at 2 (col.1 ll.15-20).) With 

respect to Claim 1 of the Hitachi patent, Langworthy teaches Elements 4 and 6, a motorized 

circular saw assembly with a motor housing. The Court also finds that it teaches those portions 

of Element 7 and 8 that describe parallel motor and saw shafts, displaced by at least one blade 

radius and connected by transmission means, which permit the user to make unobstructed cuts at 

various angles relative to the workpiece – i.e., the patient’s body. (See id. at 1 (figs.1-3), 2 (col.1 

ll.49-52, col.2 ll.83-94); Tr. at 285:17-286:4 (Gililland).) 

D. Differences Between the Prior Art and the Claims at Issue 

The prior art collectively teaches every element of Claim 1 of the ’294 patent. Although 

no reference alone teaches the ability to make dual-bevel cuts with a parallel-shaft saw assembly 

mounted on a downward pivot, it is not necessary for any single reference to anticipate every 

element of Claim 1, because “the need to determine obviousness presumes anticipation is 

lacking.” Connell v. Sears, Roebuck & Co., 722 F.2d 1542, 1548 (Fed. Cir. 1983). 

1. The AAPA 

As both parties agree, the AAPA does not teach Element 8 of Claim 1 of the Hitachi 

patent. (See Tr. at 122:9-123:1 (Hatch); id. at 251:21-22 (Gililland).) 

2. Ito 

Because the axes of Ito’s motor and saw shafts intersect at an acute angle, Ito does not 

teach Element 7’s parallel shaft structure, nor does it teach those portions of Element 8 regarding 
31 

the shafts’ displacement. 

3. Johnson 

Johnson does not teach Element 2, a turntable rotatably disposed in the machine’s worksupporting base, nor does it teach the portion of Element 3 referring to the fact that the turntable 

supports the structure that permits tilting. (See Tr. at 136:8-21 (Hatch).) In addition, because 

Johnson’s saw assembly is mounted on hydraulic arms that are part of the positioning 

mechanism, Johnson does not teach Element 5, which describes a holder that supports the saw 

assembly and contains a pivot shaft about which the saw can swing downwards into the 

workpiece. And because the Court has seen nothing to suggest that Johnson’s saw could tilt 

more than 45° in any direction, the Court finds that Johnson does not teach those portions of 

Element 8 that discuss the ability to tilt at an angle “greater than” 45 degrees. 

4. Ambrosio 

Like Johnson, Ambrosio does not teach Element 2, the portion of Element 3 referring to 

the turntable’s support of the tilting structure, or the portion of Element 5 describing a pivot shaft 

for the saw assembly. (See also Tr. at 331:7-332:1 (Gililland).) And, as discussed, Ambrosio 

does not actually teach all of Element 7 because the motor shaft is below the saw shaft, although 

this is not a material difference. See supra Section II(C)(4). Finally, Ambrosio does not teach a 

specific bevel-cutting angle, and therefore does not teach Element 8’s reference to “an angle 

greater than or equal to 45 degrees.” (See Tr. at 144:1-2 (Hatch); id. at 330:21-25 (Gililland).) 

5. Langworthy 

Langworthy is a handheld device, so it does not teach Element 1, a base supporting the 

workpiece. Like Johnson and Ambrosio, it does not teach Elements 2, 3, or 5, because it lacks a 

turntable, a holder that permits tilting, and a pivot shaft. And because the device’s orientation is 

not fixed in space nor is the saw shaft’s location fixed relative to a cutting surface, Langworthy 
32 

does not teach those portions of Element 7 that refer to a motor shaft “above” the saw shaft, or 

those portions of Element 8 that refer to the ability to tilt 45° relative to a “zero-tilt angle 

position.” (See generally Tr. at 139:23-142:4 (Hatch).) 

E. A Reason to Combine the Elements 

“[A]ny need or problem known in the field of endeavor at the time of invention and 

addressed by the patent can provide a reason for combining the elements in the manner claimed.” 

KSR, 550 U.S. at 420. In particular, “[w]hen there is a design need or market pressure to solve a 

problem and there are a finite number of identified, predictable solutions, a person of ordinary 

skill has good reason to pursue the known options within his or her technical grasp.” Id. The 

Court “need not seek out precise teachings directed to the specific subject matter of the 

challenged claim,” id. at 418, because its analysis can instead “take account of ‘the inferences 

and creative steps,’ or even routine steps, that an inventor would employ . . . .” Ball Aerosol and 

Specialty Container, Inc. v. Ltd. Brands, Inc., 555 F.3d 984, 993 (Fed. Cir. 2009) (quoting KSR, 

550 U.S. at 418). Ultimately, whether a particular combination of references is “obvious to try” 

will depend upon “the characteristics of the science or technology, its state of advance, the nature 

of the known choices, the specificity or generality of the prior art, and the predictability of results 

in the area of interest.” Abbott Labs. v. Sandoz, Inc., 544 F.3d 1341, 1352 (Fed. Cir. 2008). The 

mechanical arts are among the “predictable arts,” Liebel-Flarsheim Co. v. Medrad, Inc., 481 F.3d 

1371, 1379 (Fed. Cir. 2007), and “[i]n the predictable arts, a trial record may more readily show 

a motivation to combine known elements to yield a predictable result, thus rendering a claimed 

invention obvious.” Rothman v. Target Corp., 556 F.3d 1310, 1319 (Fed. Cir. 2009). 

Applying these guiding principles, the Court finds that at the time this saw was invented, 

there was a recognized design need given the limitations of both the AAPA and Ito, there were a 

finite number of predictable solutions, the saw assembly designs of Johnson, Ambrosio, and 
33 

Langworthy were known options within the ordinarily skilled person’s technical grasp, and there 

was therefore a good reason to combine those references’ saw assembly designs with the AAPA 

or Ito. 

1. Combining the AAPA with Johnson, Ambrosio, or Langworthy 

The ’294 patent describes a desire to improve upon the AAPA’s “very low” efficiency by 

redesigning the saw assembly to move the motor so it would not hit the base when tilting the saw 

45° in either direction. (Jt. Ex. 1 at 8 (col.1 ll.19-33).) Ito voiced similar concerns about the 

conventional single-bevel design. (See Jt. Ex. 7 at 11 (col.11-17).) Ushiwata also testified that 

“as of 1992, there had been an industry desire for a desktop miter saw able to pivot 45° in either 

direction to make bevel cuts.” (Ushiwata Decl. ¶ 10.) Given Ushiwata and Ito’s independent 

recognition that the state of the art was inadequate, the Court finds that at the time the Hitachi 

device was made, the ordinarily skilled person would also have perceived “a design need or 

market pressure” that would have furnished sufficient reason to consider altering the AAPA’s 

saw assembly. KSR, 550 U.S. at 420. 

 The AAPA’s saw assembly’s defining features are (i) its parallel motor and saw shafts 

and (ii) the motor shaft’s direct connection with and transmission of power to the saw shaft 

through toothed engagement. The hypothetical inventor could have tried to re-orient the motor 

shaft so it was no longer parallel to the saw shaft, while keeping the shafts in direct contact 

through toothed engagement. Re-orienting the motor shaft to an acute angle relative to the saw 

shaft would have led to a design like Ito’s, and re-orienting it so it was perpendicular to the saw 

shaft would have led to a “single-stage” version of the JPN ’901 design (if one were possible). 

The record shows that both such orientations in Ito and JPN ’901 require beveled gears.13 

 13 “Whether or not [JPN ’901] is a prior art reference, it is evidence that can be used to 

demonstrate a motivation to combine implicit in the knowledge of one of skill in the art of 
34 

Because Ushiwata criticized the use of JPN ’901’s beveled gears as an “expensive means for 

motive power transmission” (Jt. Ex. 1 at 8 (col.1 ll.44-46)), and both Katz and Gililland testified 

that beveled gear designs are susceptible to vibrations and related phenomena that can affect the 

quality of the cut (Katz Decl. ¶ 19; Tr. at 265:11-16 (Gililland)), the ordinarily skilled person 

would have shared these opinions and viewed the use of beveled gears as problematic. This 

hypothetical inventor would therefore have also considered keeping the saw assembly’s motor 

and saw shafts parallel while eliminating their direct contact through toothed engagement, in 

favor of some other means of transmission. Because Langworthy’s parallel but displaced shaft 

structure was old and “well-known” in the art (Tr. at 284:17-24 (Gililland)), as shown by 

Johnson and Ambrosio’s use of similar designs, the hypothetical inventor would have had 

sufficient reason to try to adapt the AAPA to incorporate that design. 

2. Combining Ito with Johnson, Ambrosio, or Langworthy 

The evidence presented also demonstrates that the ordinarily skilled person would have 

had reason to improve upon Ito.14 First, Ito uses beveled gears to transmit power from the motor 

to the saw. (See Jt. Ex. 7 at 13 (col.6 ll.22-26), 15 (Claims)); see also Tr. at 153:6 (Hatch).) As 

discussed, the use of beveled gears was criticized by Ushiwata, Katz, and Gililland. Second, 

Katz testified that the off-center placement of Ito’s angled motor creates a weight imbalance that 

makes it “difficult to dial in a bevel angle precisely” when the user tilts the saw to the side where 

 

[power tool design].” Nat’l Steel Car, Ltd. v. Canadian Pac. Ry., Ltd., 357 F.3d 1319, 

1339 (Fed. Cir. 2004) 

14 Although Ito’s application was filed with the PTO on May 18, 1993, and Hitachi’s 

original ’294 patent application was filed with the PTO on June 3, 1993, it is irrelevant whether 

Ushiwata himself knew of Ito when drafting the ’294 patent, or whether Ushiwata had any 

reason to combine Ito with other prior art references. Findings of fact – such as whether there 

existed a reason to combine the prior art – are made from the perspective of the hypothetical 

person of ordinary skill in the field of invention. See Glaverbel Societe Anonyme, 45 F.3d at 

1555. This hypothetical person “is presumed to know all the pertinent prior art, whether or not 

the [real-world] applicant is actually aware of its existence.” Carlson, 983 F.2d at 1038. 
35 

the motor is. (Tr. at 54:13-21.) The Court finds that the ordinarily skilled person would have 

been aware of these shortcomings. That hypothetical inventor would therefore have had reason 

to improve upon Ito by redesigning its saw assembly and looking to the prior art for instruction 

on how to do so. Just as with the AAPA, the hypothetical inventor would consider the finite 

number of alternatives to Ito’s angled motor and beveled gear transmission and find it obvious to 

try the parallel shaft structure and transmission means taught by Johnson, Ambrosio, and 

Langworthy. 

F. Secondary Considerations 

Hitachi has asserted that the ’294 patent was not obvious in light of objective evidence 

that its design filled a long-felt but unsolved need in the industry for a dual-bevel desktop miter 

saw. (See, e.g., Hatch Decl. at 1 ¶ 1; Katz Decl. ¶ 1; Tr. at 56:18-19 (Katz).) Hitachi has also 

argued that JPN ’901 is evidence of a failed attempt to satisfy that need and further weighs in 

favor of the ’294 patent’s non-obviousness. (See, e.g., Tr. at 202:23-203:7 (Hitachi’s counsel).) 

Although the issue of “failure of others” is sometimes viewed as distinct from the issue of “longfelt need but unsolved need,” they are complementary considerations, see Schechter & Thomas, 

supra, § 17.3.3.6, and the Court will consider them together.15 Accord Minn. Min. and Mfg. Co. 

v. Johnson & Johnson Orthopaedics, Inc., 976 F.2d 1559, 1574 (Fed. Cir. 1992) (finding that 

“long felt but unsolved need” was “established by the attempts and failures of the major players 

in the [] field”). Nonetheless, the Court finds that plaintiff has failed to satisfy its burden of 

demonstrating a long-felt need in the industry that others failed to solve. 

The mere existence of a market demand or design need at the time the invention was 

made cannot, alone, constitute evidence of non-obviousness, because “design incentives and 

 15 The issue of prior failures was also previously considered by the PTO, so it is properly 

raised in this action. (See Examiner’s Decision at 10.) 
36 

other market forces” can in fact prompt obvious variations of existing inventions. KSR, 550 U.S. 

at 417; see also supra Section II(E). Similarly, “the mere passage of time without the claimed 

invention is not evidence of nonobviousness.” In re Kahn, 441 F.3d 977, 990-91 (Fed. Cir. 

2006) (quoting Iron Grip Barbell Co. v. USA Sports, Inc., 392 F.3d 1317, 1325 (Fed. Cir. 2004)). 

Rather, the need in question must be both “long-felt” and “unsolved.” See Monarch Knitting 

Machinery Corp. v. Sulzer Morat GmbH, 139 F.3d 877, 884 (Fed. Cir. 1998) (“The relevant 

secondary consideration is ‘long-felt but unsolved need,’ not long-felt need in isolation.” 

(emphasis in original)). If a “need was not only genuine, but long felt – that is, long consciously

recognized,” it permits the inference “that for a long period of time actual artisans were 

attempting to solve the problem,” yet failed to do so. Dickey-john Corp. v. Int’l Tapetronics 

Corp., 710 F.2d 329, 346 (7th Cir. 1983) (emphasis in original). “Actual documented failures of 

others” would further “enhance the inference that the patent in issue is a ‘new display of 

ingenuity beyond the compass of the routineer . . . .’” Id. at 346 (quoting Kirsch Mfg. Co. v. 

Gould Mersereau Co., 6 F.2d 793, 794 (2d Cir. 1925) (Hand, J.)). Thus, it is not the existence of 

the need, but rather the need’s persistence and the elusiveness of its solution that weighs in favor 

of the non-obviousness of an invention that ultimately solves the problem. Accordingly, 

“[e]stablishing a long-felt need requires a showing that others skilled in the art” – here, the art of 

power tool design – “in fact perceived a need and that this perception persisted over a long 

period of time without resolution by the prior art.” Markman, 987 F. Supp. at 43. The need is 

“analyzed as of the date of an articulated identified problem and evidence of efforts to solve that 

problem.” Texas Instruments Inc. v. U.S. Int’l Trade Comm’n, 988 F.2d 1165, 1178 (Fed. Cir. 

1993). 

Hitachi established that the first single-bevel miter saws became widely available in the 
37 

United States in 1985 or 1986. (Tr. at 34:16-17 (Katz).) The single-bevel saw’s limitations were 

immediately evident to finish carpenters working in compact workspaces. (Tr. at 35:5-12, 48:8-

12 (Katz); see also Ushiwata Decl. ¶¶ 11-12.) In order to make left-hand and right-hand bevel 

cuts into a workpiece using a single-bevel saw, one must either “helicopter” the workpiece or flip 

it over. (See Tr. at 39:9-15 (Katz); Ushiwata Decl. ¶¶ 13-14.) Both methods have their 

limitations: helicoptering becomes less convenient as the width of the workspace approaches the 

length of the workpiece, while flipping is not a viable option for crown molding or other 

materials with only one flat surface that can rest stably on the saw’s base. (See Ushiwata Decl. 

¶¶ 13-14; Tr. at 37:15-41:7 (Katz); id. at 235:9-13 (Gililland).) In September 1986, Ushiwata 

developed his first dual-bevel saw design, which was published in 1988 as JPN ’901. (Ushiwata 

Decl. ¶15.) In 1988, Hitachi introduced its sliding single-bevel miter saw into the American 

market. (Katz Decl., Ex. C at 1.) In early 1992, both Ushiwata and Ito finalized their dual-bevel 

designs that were eventually published in the 1993 U.S. filings of the ’294 and Ito patents. (See 

Ushiwata Decl. ¶ 16; Jt. Ex. 7 at 1 (Ito’s “Foreign Application Priority Data”); Tr. at 197:20-22 

(PTO counsel).) Ito’s saw was commercially available in the United States by late 1994 or early 

1995, and the Hitachi device debuted shortly thereafter, around spring 1995. (Katz Decl., Ex. C 

at 1.) Hitachi thus presented evidence of a six or seven year gap between the domestic 

commercial introduction of single-bevel saws and the design of two production-worthy dualbevel saws, and an eight to ten year gap until the domestic commercial introduction of those 

dual-bevel designs. Nonetheless, Hitachi failed to carry its burden of showing that its dual-bevel 

design satisfied a long-felt but unsolved need in the art. 

First, the Court finds that Hitachi has not established that prior to 1992, the power tool 

design industry “had any need to move from” a single-bevel design to a dual-bevel one. See 
38 

Radix, U.S.P.Q.2d at 1695 (emphasis in original); Orthopedic Equipment Co., Inc. v. All 

Orthopedic Appliances, Inc., 707 F.2d 1376, 1382 (Fed. Cir. 1983) (affirming conclusion of 

obviousness because, inter alia, “there was no evidence that the industry perceived a [problem 

solved by the device in question] as a ‘long felt but unsolved need’”); cf. Ecolochem, Inc. v. S. 

Cal. Edison Co., 227 F.3d 1361, 1377 (Fed. Cir. 2000) (finding claim obvious where, inter alia, 

evidence showed that method for processing water was not developed “in response to a long-felt 

need in the power industry”). The Court credits Gililland’s testimony that the power tool design 

industry did not perceive any articulated need for a dual-bevel saw during his employment at 

Emerson Electric, the world’s largest manufacturer of power tools at the time. (See generally Tr. 

at 227-31.) Between 1988 and 1994, Gililland designed power tools for Emerson, which “made 

all of the power tools,” including miter saws, for retailer Sears. (Id. at 226-27.) During that 

time, he participated in monthly product planning meetings and reviewed annual marketing 

surveys of power tool customers, yet “there was never a project for the development of a double 

bevel [saw],” and he did not recall any proposal or survey regarding double-bevel designs. (Id. 

at 229-30.) 

Given Ushiwata’s testimony that an “industry desire” for a dual-bevel saw existed “as of 

1992” (Ushiwata Decl. ¶ 10), Hitachi’s evidence does not meaningfully rebut Gililland’s 

testimony. For example, Katz testified that the first major hardware review of a single-bevel 

sliding miter saw was published in 1990 and praised the single-bevel saw as a vast improvement 

over earlier tools for making compound cuts. (See Tr. at 35:16-19 (“[T]he sliding [single-bevel] 

compound miter saw that was introduced completely overwhelmed [the reviewers], just 

overnight people were no longer having to carry a 200 or 300-pound saw onto a job site.”). This 

favorable review does not show that the industry recognized a need to replace the single-bevel 
39 

design; if anything, it tends to show that as late as 1990, there was no articulated need for an 

alternative design. Similarly, Hitachi introduced a 1995 tool buyer’s guide that reviewed sliding 

compound miter saws but did not criticize the single-bevel design and noted the arrival of the Ito 

and Hitachi dual-bevel designs by simply stating that “[t]wo new saws . . . tilt both left and 

right.” (Katz Decl., Ex. C at 1.)16 The evidence establishes a “lack of demonstrated customer 

interest” for a dual-bevel saw during the relevant time period, and this “flatly contradict[s]” the 

possibility of a long-felt need. Nat’l Steel Car, Ltd. v. Canadian Pac. Ry., Ltd., 357 F.3d 1319, 

1340 (Fed. Cir. 2004).17

Second, the continued commercial availability of Hitachi’s own single-bevel design as 

recently as “a few years ago” (Tr. at 328:3-6 (Gililland)) further undercuts the notion that there 

was a long-felt need for a dual-bevel design to replace the single-bevel saw. Cf. Radix, 

U.S.P.Q.2d at 1695. Plaintiff’s evidence also shows that through at least 1999, tool reviewers 

 16 Only one of the tool reviews submitted with Katz’s declaration discusses the 

limitations of the single-bevel design (see Katz Decl., Ex. D at 2), but this cursory reference does 

not establish the existence of an identified and persistent need in the industry between 1985 and 

1992. And although Katz consulted on saw design with companies such as Makita, Ito’s 

assignee (Katz Decl. ¶ 6), he did not testify that these consultations related to the industry’s 

perceived need for double-bevel saws during the relevant time period. (See Tr. at 29-33.) 

17 Whatever customer interest did exist appeared limited to a subset of single-bevel saw 

users. Katz testified that the single-bevel design’s limitations “wouldn’t matter” in larger rooms 

(Tr. at 40:16-20) and that despite the availability of dual-bevel saws, finish carpenters “still 

prefer to whirly-bird their material around rather than swinging the saw to the second bevel, to 

the right-hand bevel, if it’s easier to swing the material . . . .” (Id. at 42:17-23.) Plaintiff thus did 

not establish that carpenters as a whole were not content with their “work-around” of either 

helicoptering or flipping the workpiece (Tr. at 37:18 (Katz)), or even that finish carpenters who 

cut crown molding were not content with being limited to the helicoptering work-around. See 

Nat’l Steer Car, 357 F.3d at 1340 (finding insufficient evidence of long-felt need for railway car 

modifications where “customers were satisfied” with existing design); cf. Radix, U.S.P.Q.2d at 

1695. Rather, those who were most dissatisfied with the single-bevel design appeared to be 

carpenters who regularly cut crown molding in cramped workspaces. Given this seemingly 

“niche market” for an alternative to single-bevel saws, “it is not surprising that it took a few 

years for a company to expand on the prior art at issue here.” Tokyo Keiso Co., Ltd. v. SMC 

Corp., 533 F. Supp. 2d 1047, 1060 (C.D. Cal. 2007), aff’d 307 F. App’x 446 (Fed. Cir. 2009). 
40 

evaluated many single-bevel and dual-bevel saws without suggesting that the latter design made 

the former obsolete (see, e.g., Katz Decl., Ex. D at 1 (“The sliding compound miter saws 

reviewed here are among the most accurate, well-engineered, and just plain beautiful tools you’ll 

ever own.”), 5 (“We aren’t going to hand out any prizes for first place.”)), except in the specific 

context of cutting long workpieces in small workspaces. (See id. at 2 (“For those times when 

you can’t stick that extra few feet of trim out the living room window, the double-compound 

feature is wonderful.”).) Similarly, tool reviewers in April 1996 “had a hard time picking a 

‘winner’” from among the single-bevel and dual-bevel miter saws that they tested, because “[a]ll 

of them work well, and which model you select depends entirely upon your budget and 

requirements for cutting capacity and versatility.” (Id., Ex. E at 2.) 

Third, the Court finds that Hitachi’s attempt to point to JPN ’901 as a failed attempt 

cannot succeed, because there is no evidence that JPN ’901 did not actually accomplish its goal 

of tilting 45° in both directions. Rather, Ushiwata deemed it “not viable, mainly because the use 

of [a] bevel gear resulted in a high cost design that created unacceptable noise and gear backlash. 

(Ushiwata Decl. ¶ 15 (emphases added); see also Jt. Ex. 7 at 11 (Ito’s criticism of JPN ’901’s 

design as too costly).) To the extent that Ushiwata decided against putting JPN ’901 into 

production because of its cost, it “was thus not a failed attempt, but a calculated business 

judgment to abandon a potential new product line.”18 DyStar Textilfarben GmbH & Co. 

 18 However, even if JPN ’901 were a failed attempt, this single failure is not persuasive 

evidence of non-obviousness. Non-obviousness is determined from the perspective of the 

hypothetical inventor who, “unlike the ordinary artisan, has knowledge of all the pertinent prior 

art which would assist him in solving the problem.” Dickey-john, 710 F.2d at 346 (emphasis in 

original). “Such knowledge is not likely attributable to any living person, or even an 

interdisciplinary team of inventors.” Schechter & Thomas, supra, § 17.3.3.6. Therefore, the fact 

that one real-world inventor, Ushiwata, “failed for a time in finding the solution may be 

attributable to the simple fact that [he] failed to take advantage of the massive body of 

knowledge already in the public domain.” Dickey-john, 710 F.2d at 346. 
41 

Deutschland KG v. C.H. Patrick Co., 464 F.3d 1356, 1371-72 (Fed. Cir. 2006). 

Accordingly, the Court concludes that the Hitachi device did not fill a long-felt but 

unsolved industry need. 

III. CONCLUSION

Based on the foregoing findings of fact and conclusions of law, the Court concludes that 

the person of ordinary skill in the art of power tool design would have had ample reason in the 

1990s to try to combine the teachings of the AAPA or Ito with the saw assembly designs taught 

by Johnson, Ambrosio, or Langworthy in order to arrive at the subject matter disclosed in Claim 

1 of the ’294 patent and ’517 application. It would have been obvious to try the “combination of 

known elements” in Claim 1 in order “to address a recognized problem,” Ball Aerosol, 555 F.3d 

at 991, because “a person of ordinary skill in the art at the time of the invention would have 

recognized the value of using a known element” – a saw assembly whose motor and saw shafts 

were parallel but displaced by at least one blade radius, as taught by Johnson, Ambrosio, or 

Langworthy – as the saw assembly to be mounted on the AAPA or Ito’s tiltable holder. In re 

Translogic Tech., Inc., 504 F.3d 1249, 1262 (Fed. Cir. 2007). Claim 1 thus “‘simply arranges 

old elements with each performing the same function it had been known to perform’ and yields 

no more than one would expect from such an arrangement . . . .” KSR, 550 U.S. at 417 (quoting 

Sakraida, 425 U.S. at 282). 

“Plaintiff has shown no ‘persistent’ problem . . . which evaded solution by those in the 

art. Rather, the evidence, including the prior art, more clearly indicates that plaintiff’s [design] 

evolved through the exercise of ordinary skill in the natural and expected development of the art, 

and while it may have solved a problem, it did so in an obvious way.” Ellicott Mach. Corp. v. 

United States, 405 F.2d 1385, 1391-92 (Ct. Cl. 1969). The Court concludes that the subject 
42 

matter of Claim 1 of plaintiff’s Reissue Application 08/879,517 is obvious under 35 U.S.C. § 

103(a) and therefore not patentable. Accordingly, the decision of the Board will be upheld. A 

separate order and judgment accompanies this Memorandum Opinion. 

 /s/ 

 ELLEN SEGAL HUVELLE 

 United States District Judge 

DATE: May 29, 2009