N OTE : This disposition is nonprecedential. 

# United States **Court of Appeals**  **for the Federal Circuit**

______________________
POLYGROUP LIMITED MC O, Plaintiff

- Appellant

v.

WILLIS ELECTRIC COMPANY, LT D, Defendant

- Appellee

______________________

2018

- 1748, 2018

- 1749, 2018

- 1750

______________________ Appeal s from the United States Patent and Trad emark Office, Paten t Trial and Appeal Board in Case Nos. IPR2016

- 01615 , IPR2016 -0 1616
, a nd IPR2016

- 01617

.

______________________

Decided: January 28, 2019

______________________

R OBERT A. A NGLE , Troutman Sanders LLP

, Richmond, VA , argued for appellant. Also represented by D ABNEY J EFFERSON C ARR , IV, C HRISTOPHER F ORSTNER , L AURA A NNE K UYKENDALL ; D OUGLAS S ALYERS , Atlanta, GA.

L ARINA A. A LTON , Fox Rothschild LLP

, Minneapolis

, MN , argued for appellee.

______________________

Before D YK , R EYNA , and H UGHES , Circuit Judges.POLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 2

H UGHES , Circuit Judge

. This is a patent case involving lighted a rtificial trees. Polygroup L td. MCO petitioned for inter partes re view of U.S. Patent No . 8, 936,379. The Patent Trial and Appeal Board instituted re view of all challenged claims

. The Board determined that Polygroup had not establish ed the unpatentability of any of the challenged claims

. Pol ygroup now appeals. Because the Board did not err in finding that Korengold does not teach an “interference fit” under the broadest reasonable interpretation of that term, we affirm the Board’s de termina tion that clai ms 12, 15, and 32 were not shown to be unpatentable

. But , we find that t he Board erred in construing “modular artificial tree” and erred in finding that Polygroup failed to esta blish a motivation to combine the asserted prior art

. As a result

, we vacate the Board’s determination that claims 1– 6, 8, 10

– 11, 13

– 14, 16

– 17, and 28

– 29 were not shown to be unpatentable . On remand

, the Board should consider whether those claims are unpatentable under a proper construction.

I

A.

Willis Electric Co

. , L td. owns the ’379 patent , which is directed to a lighted artificial tree. The tree is comprised of “separable

, modular tree portions mechanically and electrically connectable between trunk portions.” ’ 379 patent col. 1 ll. 13

– 15

. The hollow trunk portions contain electrical wiring and electrical connectors that provide a source of electricity for light strings draped over the branches. The connectors are designed so that m echan ically connecting trunk portions during assembly also creates an elect rical connection between the trunk po rtions

. T he connectors form an electrical connection regardless of the rotational alignment of the trunk portions

. These features simplify tree assembly by removing the need for “ significant manipulation and handling of thePOLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 3

tree sections to securely align and couple the sections together. ” ’379 patent col. 2 ll. 26

– 28. The ’379 patent relates to the patents at issue in our companion case, Polygroup Ltd. v. Willis Elec. Co. , N o. 1 8- 1745
, slip op. (Fed. Cir. Jan. 28 , 2019), but the ’379 patent focuses more specifically on the structure and positioning of the mechanical

- electrical connectors within the trunk sections. Independent claims 1 and 5 are representative of the challenged c laims and are reproduced below.

1. A modular artificial tree , comprising:
a first trunk portion having a first elongated trunk body defining a first cavity for receiving a first wiring harness including a first electrical wire and a second electrical wire;
a second trunk portion having a second elongated trunk body defining a second cavity for receiving a second wiring harness including a first electrical wire and a second electrical wire;

a first trunk connector insertable into the first trunk body along a central vertical axis, and s ecurable to the first trunk body in at least four r otational alignment positions about the central vertical axis, including at a final insertion pos ition, the first trunk connector being entirely l ocated within the first cavity at the final insertion position[;]
a first electrical contact set including a first ele ctrical contact and a second electrical contact e ngaged with the first trunk connector and electrically connected to the first electrical wire and the second electrical wire of the first wiring harness, respectively;

a second trunk connector insertable into the se cond trunk body along the central vertical axis, andPOLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 4

securable to the second trunk body in at least four rotational alignment positions about the central vertic al axis, including at a final insertion pos ition;
a second electrical contact set including a first electrical contact and a second electrical contact engaged with the second trunk connector and electrically connected to the first electrical wire and the second electrical wire of the second wiring harness, respectively; and
wherein connecting the first and second trunk portions causes the first electrical contact set to be electrically connected to the second electrical co ntact set. ’379 patent col. 23 l. 63

– col. 24 l. 30 (emphasis added).
5. A lighted modular artificial tree , comprising:
a first tree section including a first elongated trunk defining a vertical axis, a plurality of branches coupled to the first trunk, and a first plurality of lights, the first elongated trunk e nclosing a first wiring harness configured to supply power to the first plurality of lights;
a second tree section including a second elongated trunk, a plurality of branches coupled to the se cond trunk, and a second plurality of lig hts, the second elongated trunk housing a second wiring harness;
a connector assembly configured to connect the first tree section to the second tree section along the vertical axis, the connector assembly including a first trunk connector located at least partially within the first trunk, a second trunk connector located at least partially within the second trunk,POLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 5

a first pair of electrical contacts electrically co nnectable to a second pair of electrical contacts;
a top tree section including a vertically extending top portion, a plurality of branches coupled to the top portion, and a third plurality of lights, and a top connector connecting the top tree section to the second tree section and including:
a top connector body having a first portion inser table into the second trunk, a flanged portion co upled to the first portion, and a receiving port for receiving a portion of the vertically extending top portion, and
wherein the first plurality of light s are electrically connected to the second plurality of li ghts through the connector assembly, and the second plurality of light s are electrically connected to the third plurality of lights and,
wherein the flanged portion of the top connector body is outside the second trunk body and ab u tting a top edge of the s econd trunk portion.
’379 patent col. 24 l. 51

– col. 25 l. 16 (emphasis added)

. The preamble of each challenged claim recites a “modular artifi cial tree

. ” Claim s 1
, 17
, and 29 require that the connector fit into the trunk body “in at least four rotational alignment positions about the central vertical axis.” ’379 patent col. 24 ll. 20

– 21; see also id. at col. 26 ll. 3– 5; id. at col. 28 ll. 33

– 34. Although none of the claims here recite the “tree portion” l imitation at issue in our companion case, see Polygroup , No. 18

- 1745 , slip op. at 4
, claim 5 recites multiple “tree sections .” And t he Board construed “ tree section ” identically to “tree portion .” See id. at 7 (noting that the Board construed “tree portion” to mean “a mechanically and electrically connectable mod ular and unitary portion of an artificial tree”). C laims 12, 15, and 32 depend from claims 1, 5, and 28 respectively

,POLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 6

and each add s the limitation of an “interference fit” formed between the trunk connector and the trunk body.

B.
Polygroup L td. filed three petitions for IPR of the ’379 patent alleging obviousness based on different combin ations of prior art references. T he Board instituted review on all challenged grounds in three separate IPR procee dings

. Polygroup’s petitions rely on six prior art references, three of which are relevant here: U.S. Patent No. 4,072,857 (DeVicaris), U.S. Patent No. 2,229,211 (Kore ngold), and U.S. Patent Application Publication No. 2007/0230174 A1 (Hicks).
Polygroup relies on DeVicaris for each of its asserted grounds

. DeVicaris is directed to an artificial tree with hollow trunk sections that contain electrical wiring and have electrical

- mechanical connectors for attaching the trunk sections. During assembly, the trunk sections must be aligned in a single rotational position about the vert ical axis. The branches in DeVicaris are detachable from the trunk sections , and the tree is assembled by first connecting the trunk sections, and then attaching the branches to the trunk.
Polygroup relies on Korengold to teach both the “interference fit” limitation in claims 12, 15, and 32, and the “four rotational alignment positions” limitation in claims 1, 17, and 29. Korengold is directed to an electr ical connector used to supply power between conduit pipe sections in an electrical device with multiple tubular parts , such as a modular lamp. The external diameter of the connector is “substantially equivalent” to the internal diameter of the pipe, which allows the connectors to form a “snug fitting” when inserted into the pipe. J.A. 1100. Polygroup argues that Korengold’s “snug fit [] ” is equiv alent to the “interference fit” in the ’379 patent . PolygroupPOLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 7

also argues that a person of ordinary skill in the art would have been motivated to apply the type of conne ction taught by Korengold to the connectors in DeVicaris

, resulting in a “connector

. . . securable to the [] trunk body in at least four rotational alignment positions.” ’379 patent col. 24 ll. 1 8– 21. Polygroup relies on Hicks for the obviousness of claims 5, 10, 11, and 15

– 17. Hicks discloses an artificial tree with hollow trunk members that house the light wiring system. Hicks also teaches remova ble branches, each having its own electrical connector. Electricity is provided to the light strings on each branch individually, so that a branch can be removed and replaced without affe cting lights on other branches.

C.

The Board issued a consolidated decision for the three IPRs challenging the ’379 patent

. A majority of the Board found that Polygroup failed to prove by a preponderance of the evidence that any of the challenged claims are unpatentable. 1

The Board first addressed the construction of “mod ular artificial tree ” recited in the preamble of each claim. The Board found the preamble to be limiting, and it construed “modular artificial tree” to mean “a tree co nstructed of modular portions, each modular portion being a separate tree section.” J.A. 14. Crediting the testimony of Willis’ s expert, the Board found that a “person having ordinary skill in the art ‘recognizes modular’ as a ‘distinct’ type of artificial tree with tree sections that come ‘with branches pre

- attached to the trunk’ so that assembly is ‘quick and easy.’” J.A. 19. Accordingly, the Board found

1 A single member of the Board dissented and would have found all challenged claims unpatentable as obvious under 35 U.S.C. § 103.POLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 8

that neither DeVicaris nor Hicks teach es a “modular artificial tree” because the branches of each are separat ely attached to the trunk sections. Because every cha lle nged claim recites a “modular artificial tree

, ” and Polygroup failed to provide a prior art reference teaching that limitation, the Board found that Polygroup failed to prove that any of the challenged claims are unpatentable.

As an alternat e basis for it s patentability determin ations as to claims 12, 15, and 32, the Board found that Koren gold fails to teach an “interference fit” as required by those claims. The Board construed “interference fit” to mean “an engineered connection where two components or parts to be connected are manufactured to be of different dimensions such that when one component is pressed into the other, they interfere and deform to force a conne ction.” J.A. 30. T he Board concluded that Polygroup failed to show that Korengold’s “sn ug fit” between two parts with “substantially equivalent” diameters teaches a fit where parts “interfere to force a connection so as to secure the connection.” J.A. 47.
As an alternate basis for its patentability determin ations as to claim s 1, 2

– 4, 6, 8 , 13, 14, 17, and 29

, the Board found that Polygroup failed to establish that a skilled artisan would have been motivated to combine DeVicaris with Korengold

. Polygroup argued a person of ordinary skill would have been motivated to combine the references because the “ease of assembly [of DeVicaris] is improved because of the rotational freedom afforded by Korengold’s interference

- fit connection.” J.A. 39. According to the Board, Polygroup failed to show that Korengold teaches rotational freedom. Additio nally, because Kore ngold does not teach an “interference fit,” the Board co ncluded that a skilled artisan would not look to Korengold for such a fit.
Polygroup now appeals. We have jurisdiction under 28 U.S.C. § 1295(a)(4)(A).POLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 9

II

We first consider the Board’s claim construction s of “modular artificial tree ” and “interference fit.” We review the Board’s ultimate claim construction de novo and any underlying factual determinations involving extrinsic evidence for substantial evidence. In re Cuozzo Speed Techs., LLC , 793 F.3d 12 68 , 1280 (Fed. Cir. 2015). Su bstantial evidence requires that “a reasonable mind might accept the evidence to support the finding.” In re Gianne lli , 739 F.3d 1375, 1379 (Fed. Cir. 2014)

. During IPR of an unexpired patent , the Board gives the claims the ir broadest reasonable interpretation in light of the specification. 37 C.F.R. § 42.100(b). Under th is standard , claim terms are generally given their ordinary and customary meaning, as would be understood by a skilled art isan in the context of the entire disclosure. See In re Translogic Tech., Inc. , 504 F.3d 1249, 1257 (Fed. Cir. 2007).

For the reasons below, we find the Board er red in its construction of “ modular artificial tree, ” but it did not err in its constructio n of “interference fit.”

A.

The Board found the recitation of “modular artificial tree” in the preamble of each claim to be limiting because it “provides necessary context at least for the terms ‘trunk portion’ and ‘tree section,’ and how they interface with each other.” J.A. 12. The Board then construed “modular artificial tree” to mean “a tree constructed of modular portions, each modular portion being a separate tree section.” J.A. 11

. Relying on the testimony of Willis’ s expert , Dr. Brown , the Board concluded that a modular tree is “a ‘distinct’ type of artificial tree with tree sections that come ‘with branches pre

- attached to the trunk.’” J.A. 19. T his conclusion was error because t he Board’s co n-POLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 10

struction does not represent the broadest reasonable interpretation of “modular artificial tree.”
First, we note that other than claim 5, none of the i ndependent claims of the ’379 pa tent recite branches. We find no support for reading such a limitation into the claims as the Board did here. See Phillips v. AWH Corp.

, 415 F.3d 1303, 13 20 (Fed. Cir. 2005) (cautioning against reading limitations from the specification into the claims).
Additionally, w hile the ’379 patent’s specifi cation di scloses “ modular tree portion s ” in the Field of Invention

, see ’379 patent col. 1 l. 1 4, it also describes other aspects of the tree as “modular” throughout the specification , such as the connector assembly and light system

, s ee id. at col. 18 l. 36 (noting the “modularity and deta cha bility of connector assembly 200”); id. at col. 20 ll. 50

– 53 (discus sing the “modularity” of the lighting system). Given these disclosure s , we a re not persuaded that the broadest reasonable interpretation of “modular artificial tree” requires a tree with “tree sections that come ‘with branches pre

- attached to the trunk

. ’” J.A. 15. Instead, we find Polygroup’s proposed construction, “an artificial tree with elements capable of being easily joined or a rranged with other parts or units,” to be more consistent with the entire disclosure of the ’379 patent

. J.A. 11.

To the extent the B oard relied on Dr. Brown’s test imony in reaching its cons truction, the Board erred in doing so

. While it can be proper to rely on expert test imony “to establish that a particular term in the patent . . . has a particular meaning in the pertinent field[,] . . . conclusory, unsupported assertions by experts as to the definition of a claim term are not useful” during claim construction. Phillips , 415 F.3d at 1318. Dr. Brown’s
statement is a conclusory and unsupported assertion, and we find it to be inconsistent with the intrinsic record. So

, his testimony does not provide substantial evidentiaryPOLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 11

support for the Board’s conclusion that a modular tree is one with “branches pre

- attached to the trunk.” J.A. 15.

Because the Board’s determinations on the patentabi lity of claims 1– 6, 8, 10

– 11, 13

– 14, 16

– 17, and 28

– 29 relied solely on its erroneous construction of “modular artifi cial
tree ,” we vacate those determinations and remand to the Board for consideration of whether those claims are obvious under a proper construction. 2

B.

The Board construed “interferen ce fit” to mean “an engineered connection where two components or parts to be connected are manufactured to be of different dime nsions such that when one component is pressed into the other, they interfere and deform to force a connection.” J.A. 30. The Board emphasized that the key to an inte rference fit is that the difference in dimensions force s a connection that “is strong enough to cause the two pieces to remain fixed relative to each other. ” J.A. 22. The Board rejected Polygroup’s proposed construction, “a fit between two parts in which the external dimension of one part slightly exceeds the internal dimension of the part into which it has to fit,” J.A. 22, because it is “unco ncerned with whether the two parts are fixed relative to each othe r, and is only concerned with whether they are somewhat different in size.” J.A. 23.

2 The Board also found that Hicks does not disclose the “tree section” limitation of claim 5. The Board co nstrued “tree sec tion” to have the same meaning as “tree portion,” a limitation in the related patents at issue in our companion case. See Polygroup

, No. 18

- 1745 , slip op. at 7

. Because we found that the Board erred in construing “tree portion” in that case, id. at 10 , w e find that the Board erred in construing “tree section” here.POLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 12

We find that the Board’s construction reflects the broadest reasonable interpretation of “interference fit” given the ’379 patent’s specification. The specification desc ribes the “interference fit” between the connector and the trunk wall as one where “force is exerted” so that the parts are “held together .” See ’379 patent col. 12 l. 66

– col. 13 l. 2; see also id. at col. 13 ll. 62

– 65. The specification also explains th at the parts or components “deform” in order to fit the connector “inside [the] base

- trunk portion,” and that “[s]uch deformation or compression” forms an “interference fit.” Id. at co l . 16 ll. 1

– 4. Thus, we agree with the Board that the key consideratio n for an “inte rference fit” is the connection generated between the parts and whether the parts deform to force a connection , not whether the difference in their diameters is slight or substantial.

Because we find no error in the Board’s claim co nstructi on of “interference fit ,” we also find that the Board’s determination that Korengold does not teach an “interference fit” is supported by substantial evidence. Korengold teaches a “snug fit [] ” formed by parts with “substantially equivalent” diameters. J.A. 1100. Nothing in its disclosure teaches that the parts “interfere [and deform] to force a connection.” See J.A. 47. Nor does Korengold require that the external diameter of the connector exceed s the internal diameter of the pipe

. Thus, Korengold fails to teach an interference fit even under Polygroup’s proposed construc tion, which requires that the external dimension of one part “slightly exceeds” the internal dimension of the part into which it is to fit. See J.A. 22.

III
Next, we consider the Board’s finding that Polygroup failed to establish that a skilled artisan would have been motivated to combine DeVicaris with Korengold

. A party asserting that a claimed invention is obvious “mustPOLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 13

demonstrate . . . that a skilled artisan would have had reason to combine the teaching of the prior art references to achieve the claimed invention, and that the skilled artisan would have had a reasonable expectation of su ccess from doing so.” PAR Pharm. , Inc. v. TWI Pharm, Inc. , 773 F.3d 1186, 1193 (Fed. Cir. 2014) ( internal quot ation marks omitted)

. W hether a person of ordinary skill would have been motivated to combine the prior art is a factual question reviewed for substantial evidence

. Intercontin ental Great Brands LLC v. Kellogg N. Am. Co.

, 869 F.3d 1336, 1343 (Fed. Cir. 2017) ; see also In re Gia nnelli , 739 F.3d at 1379

. In its p etition, Polygroup argued that a skilled artisan would have been motivated to enhance the tree from DeVicaris with the “interference fit

- type connection ” taught by Korengold. J.A. 160. According to Polygroup, “[t]he rotational freedom afforded by Korengold’s interference fit

- type connection would permit the . . . electrical connectors of DeVicaris to be inserte d into, and secured within, respective trunk sections in any rotational alig nment position.” Id.
The Board rejected Polygroup’s proposed motivation. T he Board found that Korengold does not teach rotational freedom because “an electrical connector asse mbly within a conduit pipe . . . does not in itself teach rotational fre edom.” J.A. 40. Further , because the Board determined that Korengold does not teach an “interference fit,” it found that a skilled artisan would not look to Korengold for such a fit. The Board also found that a person of ordinary skill would not have been motivated to replace the connectors in DeVicaris with the connectors in Kore ngold. Given the record before us, we conclude that the Board’s rejection of Polygroup’s proposed motiva tion is not supported by substantial evidence for three reasons

. First, t he Board’s determination that a skilled artisan would not replace the connectors in DeVicaris with thePOLYGROUP LTD MCO v. WILLIS ELEC

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connectors from Korengold is irrelevant to the motivation actually proposed by Polygroup. Polygroup suggest ed enhancing DeVicaris with the connection used to insert Korengold ’s connectors into the conduit pipe

, not the connectors themselves. Because m ost of the Board’s analysis

, and the expert testimony it relie d upon , focuse d on the motivation to replace DeVicaris’s connector with Korengold’s connector , neither that analysis nor the expert testimony provides substantial evidentiary support for the Board’s rejection of Polygroup’s proposed motiv ation

. See J.A. 41

– 43 (focusing on the finding that repla cing DeVicaris’s connector with Korengold’s connector would make tree assembly more difficult).

Second , the fact that Korengold does not teach an “i nterference fit” as that term is used in claims 12, 15, and 32 is also irrelevant to the motivation to combine anal ysis. Polygroup argues that a skilled artisan would look to Korengold’s connection because it teaches rotational freedom. Polygroup ’s choice to refer to Korengold’s co nnection as an “interference fit

- type connection” has no bearing on whether Korengold teaches rotational freedom, so it also has no bearing on whether a skilled artisan would have been motivated in the manner Polygroup

proposes

. T hat Korengold does not teach an “interference fit” is only relevant to the patentability of claims 12, 15, and 32, which include that limitation.
Finally, the Board’s determination that Korengold fails to teach rotational freedom is not supported by substantial evidence. Korengold discloses a cylindrical connector that is inserted into a cylindrical pipe with a “substantially equivalent” diameter such that the two parts form a “snug fitting.” J.A. 1100. Such an arrang ement would allow the connector to be inserted in “ any rotational alignment position ,” as Polygroup’s expert asserted

. J.A. 1020. Nowhere does Korengold suggest that its connectors require a particular rotational alig nment. Thus, no reaso nable fact finder c ould conclude thatPOLYGROUP LTD MCO v. WILLIS ELEC

. CO ., LTD 15

Korengold fails to teach a conne ction with rotational freedom. And we agree with Polygroup that a person of ordinary skill would have been motivated to enhance DeVicaris with Korengold because Korengold’s rotational freedom would improve the ease of assembly of the D eVicaris tree.

IV

We have considered the parties’ remaining arguments and find them unpersuasive. We conclude that t he Board erred in its construction of “modular a rtificial tree ” and that Pol ygroup establish ed a sufficient motivation to combine DeVicaris with Korengold. Therefore, we vacate the Board’s determination that Polygroup failed to prove that claims 1

– 6, 8, 10

– 11, 13

– 14, 16

– 17, and 28

– 29 are not unpatentable

. On remand

, the Board should consider whether those claims are unpatentable under a proper construction. W e affirm the Board’s determination that Polygroup failed to prove that claims 12, 15, or 32 are unpatentable b ecause Korengold fails to teach an “inte rference fit” under t he broadest reasonable interpretati on of that term

. AFFIRMED

- IN

- PART , VACATED

- IN

- PART , AND REMANDED

C OSTS

No costs.