Case ID: f-supp-3d_100/html/0871-01.html
Source: Caselaw Access Project
Author: {"author": "JON S. TIGAR, United States District Judge", "license": "Public Domain", "url": "https://static.case.law/"}
Date Created: 2024-08-24T03:29:51.129683

ASETEK DANMARK A/S, Plaintiff, v. CMI USA, INC., Defendant.
    Case No. 13-cv-00457-JST
    United States District Court, N.D. California.
    Signed April 21, 2015
    
      Robert Francis McCauley, Erik Raymond Puknys, Holly J. Atkinson, Jeffrey D. Smyth, Finnegan Henderson Farabow Garrett & Dunner, LLP, Palo Alto, CA, Arpita Bhattacharyya, Finnegan Henderson Farabow Garrett & Dunner LLP, Boston, MA, for Plaintiff.
    Elizabeth Hannah Rader, Alston & Bird LLP, Menlo Park, CA, Celine Liu, Alston & Bird LLP, Washington, DC, Frank G. Smith, III, Alston & Bird LLP, Atlanta, GA, Yitai Hu, Alston & Bird LLP, East Palo Alto, CA, for Defendant.
   FINDINGS OF FACT AND CONCLUSIONS OF LAW; ORDER ENTERING JUDGMENT IN FAVOR OF PLAINTIFF

Re: ECF Nos. 234, 235, 236

JON S. TIGAR, United States District Judge

This patent infringement case was tried to a jury in December 2014. ECF No. 189. On December 17, 2014, the jury returned a verdict in favor of Plaintiff Ase-tek Danmark A/S, finding that Defendant CMI USA, Inc.’s products infringed United States Patents No. 8,245,764 and 8,240,-362 (“’764 patent” and “’362 patent”). ECF Nos. 218, 219.

Now before the Court are the parties’ proposed findings of fact and conclusions of law, as well as CMI’s memorandum of points and authorities in support of its defenses of obviousness, indefiniteness, and lack of written description. ECF Nos. 234, 235, 236. The Court has adopted the proposed findings and conclusions as stated below, and concludes that neither the ’764 patent nor the ’362 patent are invalid for obviousness, lack of written description, or indefiniteness.

I.FINDINGS OF FACT

A. Background and Procedural History

Asetek is a Denmark-based corporation that sells liquid cooling systems for data centers, servers, workstations, and personal computers. ECF No. 1, ¶¶ 1, 11, 12. It owns the ’764 and ’362 patents by assignment. ECF No. 118 at 1. The patents relate to devices that use liquid to cool computer components. See ECF No. 1, Exs. A, B.

On January 31, 2013, Asetek filed suit against CMI for infringement of claims 14, 15, and. 17-19 of the ’362 patent, and claims 1-15, 17, and 18 of the ’764 patent, by the following CMI products: (1) Cooler Master Seidon 120M, 120XL, and 240M; (2) Cooler Master Seidon 120V and 120V Plus; (3) Cooler Master Glacer 240L; and (4) Cooler Master Nepton 140XL and 280L. ECF No. 1; ECF No. 130 at 1. In its complaint, Asetek “demanded] a jury trial on all matters triable to a jury.” ECF No. 1 at 7.

1. Claim construction

This case was consolidated for claim construction with another patent-infringement suit brought by Asetek involving the ’362 and ’764 patents. ECF No. 35 at 1 & n.l. Judge Edward M. Chen presided over the joint claim construction proceeding. Id. In its claim construction brief, CMI argued that because “several key claim terms are found nowhere in the written description[,]” these “claims are likely invalid for indefiniteness and/or lack of written description.... ” Asetek Holdings, Inc. v. Coolit Sys. Inc., Case No. 3:12-cv-04498, ECF No. 137 at 1. But CMI suggested that “the Court may decide that issue at a later time.” Id. Judge Chen agreed, reasoning that “[ijnvalidity defenses are usually addressed at summary judgment.” ECF No. 35 at 13 (citation omitted).

Judge Chen’s claim construction order also addressed several terms relating to the claims in dispute at trial. See ECF No. 35. He construed the term “reservoir,” as used in both the ’362 and ’764 patents, to mean “a receptacle or chamber for holding a liquid or fluid.” Id. at 6, 8. Asetek asked Judge Chen to construe “reservoir” to mean a single receptacle, but he declined to do so, explaining that, “[t]o the extent Asetek puts a premium on the word ‘single,’ that word is unnecessary because the fact that the claim term is ‘reservoir’ (singular) and not ‘reservoirs’ (plural) indicates that a reservoir is only one receptacle and not many.” Id. at 8. Judge Chen also declined to construe the term “substantially circular passages,” and instead adopted the plain and ordinary meaning of that term. Id. at 12-14.

2. Summary judgment

After claim construction, CMI moved for summary judgment of invalidity of the ’362 and ’764 patents and non-infringement of the ’362 patent. ECF No. 86. CMI argued that the ’362 and ’764 patents were invalid as both anticipated and obvious. See ECF Nos. 86, 106. But despite the fact that CMI’s expert opined in his report — which CMI relied on to bring its motion for summary judgment — that Ase-tek’s patents were invalid for lack of a written description and indefiniteness, see ECF No. 99-7 at 36-42, CMI did not assert or even mention these defenses in its motion for summary judgment, see ECF Nos. 86, 106. The Court denied CMI’s motion for summary judgment in full, finding genuine disputes of material fact precluded judgment in CMI’s favor. ECF No. 126.

3. Pre-trial and trial

The matter then proceeded to trial. In the parties’ joint pre-trial statement, CMI revealed that it contested infringement only of the ’362 patent, and not of the ’764 patent. See ECF No. 130 at 4-5. CMI also asserted that the ’764 and ’362 patents were invalid as anticipated, obvious, and indefinite, and because they lacked adequate written descriptions. See id. As to the defenses of lack of written description and indefiniteness in particular, the parties submitted (1) a joint pretrial statement, where the parties listed these defenses as “disputed factual issues,” ECF No. 130 at 4-5; (2) proposed joint jury instructions, where Final Instruction No. 23 addressed the lack of written description defense, see ECF No. 152 at 49; (3) a proposed jury verdict form, asking the jury to decide the lack of written description defense, ECF No. 155 at 6; and (4) a trial brief, explaining the law governing lack-of-written-description and indefiniteness defenses, ECF No. 181 at 8.

Jury selection began on December 2, 2014. On December 11, 2014, Asetek discovered that CMI had removed the lack of written description defense instruction from its final proposed jury instructions. ECF No. 236-2; see ECF No. 205 at 28. In response, Asetek’s counsel emailed CMI’s counsel, stating: “We gather from your verdict form that CMI USA is dropping its written description and indefiniteness defenses.” ECF No. 236-2. CMI’s counsel sent two emails in reply, but did not dispute or respond to Asetek’s counsel’s statement. Id. The next day, CMI also removed all mention of the lack of written description defense from its revised proposed jury verdict form. See ECF No. 206 at 3-5.

During trial, CMI did not present any evidence that the term “substantially circular” was indefinite or lacked a sufficient written description, failing to question either party’s expert regarding these topics. CMI also did not raise these defenses in its pre-verdict motion for judgment as a matter of law. See ECF No. 232. On December 17, 2014, the jury returned a verdict in Asetek’s favor. ECF No. 219.

The jury found that all of the accused products infringed the claims of the ’362 patent, and that CMI’s products contribu-torily infringed the asserted method claims of the ’362 patent. Id. at 1-2. Further, the jury found that the ’764 patent was not invalid as anticipated by the Koga prior art reference. Id. at 2.

The jury also rendered several decisions related to the question of obviousness. First, the jury found that a person of ordinary skill in the field of liquid cooling at the time of inventions claimed in the ’764 and ’362 patents was:

someone who has completed college level course work in thermodynamics, fluid mechanics, and heat transfer, and would have two or more years of experience in designing liquid cooling systems for computers or very similar technology or one with a more advanced degree in the above fields [who] may have had less practical experience.

Id. at 3. Second, the jury described the scope and content of the prior art at the time of the claimed invention as follows:

The prior art devices included a pump, a single-chamber reservoir (as that term was used in the prior art), and a cold plate as separate components that were connected using tubing or attached together with clips or screws or perm[an]ently coupled. Certain prior art devices had a pump and a cold plate incorporated into a single swirl chamber, which provided no separation between the pumping and the heat exchange functionalities of the liquid cooling device.

Id. Third, the jury determined the differences that existed between the claimed invention and the prior art at the time of the invention. The differences included:

Asetek’s patented invention is directed to a closed loop liquid cooling system in which cooling liquid is pumped continuously between a pump head and a heat radiator (positioned remote from the pump head). Rather than connecting together multiple separate components (as in the prior art), Asetek’s patented pump head design combines, into a single unit, a pump and the claimed “reservoir” that has, among other things, dual chambers and is bounded by a removable cold plate. Also, the claimed “reservoir” in Asetek’s invention is a single receptacle that is divided into an upper chamber and a lower chamber, with the upper chamber providing the pumping function and the lower chamber providing the thermal exchange function. In addition to providing efficient heat removal, Asetek’s patented invention includes at least one of the following benefits over each example of prior art: a compact (narrow) profile, cost-effective manufacturing, and reduced risk of fluid leakage.

Id. at 4. Finally, the jury found that Asetek established all objective indicia of non-obviousness that Asetek sought to prove at trial, including: (1) “commercial success of [the] product[s] due to the merits of the claimed invention”; (2) “a long-felt need for the solution that is provided by the claimed invention”; (3) “unsuccessful attempts by others to find the solution that is provided by the claimed invention”; (4) “copying of the claimed invention by others”; (5) “unexpected and superior results from the claimed invention”; and (6) “acceptance by others of the claimed invention as shown by praise from others in the field or from the licensing of the claimed invention.” Id

A few weeks after the trial concluded, CMI’s counsel advised Asetek’s counsel that CMI would pursue written description and indefiniteness defenses in its post-trial motions, ECF No. 286-1, ¶ 8, a fact it subsequently confirmed at the January 12 case management conference. At the conference, Asetek argued that CMI • had waived the defenses by not pursuing them at trial. ECF Nos. 228, 231.

On January 26, 2015, CMI filed its proposed findings of fact and conclusions of law, as well as its memorandum of points and authorities in support of its defenses. ECF Nos. 234, 235. On February 9, 2015, Asetek filed its responsive proposed findings of fact and conclusions of law. ECF No. 236.

B. Evidence Adduced at Trial 1. Experts

At trial, the parties each produced one expert to testify as to the patents-in-suit, infringement, and validity. Asetek offered the testimony of Dr. David Tilton, while CMI provided the testimony of Dr. Gregory P. Carman.

Dr. Tilton has the education and experience to qualify him as a person of ordinary skill in the art under the jury’s definition. See ECF No. 219 at 3. He has an academic background in mechanical engineering with a specific focus in “heat transfer, fluid flow, and thermodynamics.” Tilton 565:14-567:9. Dr. Tilton’s master’s thesis was in heat pipe cooling, and his doctoral thesis was in spray cooling technology. Id. at 565:20-22; 568:17-23. Spray cooling is a closed-loop liquid cooling system that is related to the liquid cooling technology of the patents-in-suit. Id. at 568:17-569:23. Dr. Tilton has twenty years of experience at a company called Isothermal Systems Research, where he developed liquid cooling products using spray cooling technology. Id. at 574:23-575:19. He has experience in developing liquid cooling products for high-end intelligence applications for the CIA, NSA, and other intelligence agencies. Id. at 575:20-577:2.

Dr. Tilton has experience developing desktop liquid cooling systems for companies such as Intel, Hewlett-Packard, Sun Microsystems, and Cray Research. Id. at 577:7-16; 577:22-578:9. In fact, Dr. Tilton testified that his company attempted to develop a liquid cooling product for the market at the time that Andre Eriksen, the named inventor on both patents-in-suit and Asetek’s founder and current CEO, was developing the patented inventions at issue here. Id.; Eriksen 276:11-18; 277:14-21; 278:10-21. Dr. Tilton was unable to develop a product that met both his cost and performance targets, such that the product could succeed in the marketplace. Tilton 580:4-16. Thus, during his twenty years of experience developing liquid cooling products at Isothermal Systems Research, Dr. Tilton contemporaneously examined the liquid cooling products available in the market prior to Asetek’s entry into the market, and he has firsthand knowledge of the prior art technologies at issue in this case. Id. at 579:8-580:22.

Dr. Carman is a professor in the Mechanical and Aerospace Engineering Department at the University of California at Los Angeles, for whom he has worked since 1992. Carman 709:1-11. He earned a bachelor’s degree in engineering and science mechanics, id. at 710:2-9, and then received a master’s degree in metallurgical and materials engineering from the University of Alabama, where he focused on fiber composites, id. at 710:17-24. Dr. Carman then received his Ph.D. in continuous fiber composites. Id. 710:25-711:4.

Dr. Carman’s research projects that he identified as most relevant to the technology claimed in the ’362 and ’764 patents include a relatively small artificial heart pump that can be used for patients waiting for heart transplants; the harvesting of thermal energy to generate electricity as the thermal energy is transferred from a hot to a cold surface; and a pump system used to heat and cool an alloy used in rocket nose cones. Id. at 716:5-720:8. Dr. Carman has taught mechanical engineering classes, but has not worked on computer liquid cooling systems. Id. at 721:14-18; 722:12-17.

2. The patented inventions

Asetek’s expert, Dr. Tilton, testified that the claims of both the ’764 and ’362 patents are directed to a liquid cooling device comprising a specific structure — a dual-chambered -reservoir bounded by a cold plate. Tilton 1412:25-1413:8. In the ’362 patent, the dual chambers in the “reservoir” are termed the “upper” and “lower” chambers, while in the ’764 patent, the chambers are called the “pump chamber,” and the “thermal exchange chamber.” ECF No. 1, Exs. A, B. In both patents, the cold plate, which forms the boundary wall of the reservoir and is placed in thermal contact with the heat generating unit of a computer, is termed the “heat exchanging interface.” Id. For example, claim 1 of the ’764 patent is stated below, with the recited “reservoir,” “pump chamber,” “thermal exchange chamber,” and “heat exchanging interface” in bold:

1. A cooling system for a heat-generating component, comprising:
A double-sided chassis adapted to mount a pump configured to circulate a cooling liquid, the pump comprising a stator and an impeller, the impeller being positioned on the underside of the chassis and the stator being positioned on the upper side of the chassis and isolated from the cooling liquid; a reservoir adapted to pass the cooling liquid therethrough, the reservoir including:
a pump chamber including the impeller and formed below the chassis, the pump chamber being defined by at least an impeller cover having one or more passages for the cooling liquid to pass through;
a thermal exchange chamber formed below the pump chamber and vertically spaced apart from the pump chamber, the pump chamber and the thermal exchange chamber being separate chambers that are fluidly coupled together by one or more passages; and
a heat exchanging interface, the heat-exchanging interface forming a boundary wall of the thermal exchange chamber, and configured to be placed in thermal contact with a surface of the heat-generating component; and
a heat radiator fluidly coupled to the reservoir and configured to dissipate heat from the cooling liquid.

ECF No. 1, Ex. B at 27:39-65.

3. Scope and content of the prior art

CMI asserts three pieces of prior art here: Patent No. 7,544,049 to Koga, et al., which is titled “Cooling Device and Centrifugal Pump to be Used in the Same Device”; Korean Patent No. 20-0314041 to Ryu, which is titled “Water Cooler for Computer Central Processing Unit Having Impeller”; and United States Patent Application 10/434307, filed May 7, 2003 by Laing, for “a Device for the Local Cooling or Heating of an Object by Means of a Fluid.” The parties agree that both Koga' and Ryu are prior art to Asetek’s patents, and both are directed to cooling systems for heat-generating components of computers. Carman 1142:13-1143:7; 1255:9-1257:6; see Tr. Ex. 529(Ryu); Tr. Ex. 535 (Koga). CMI also relies on Laing as a prior art reference to the claimed inventions. See, e.g., ECF No. 234 at 6-7.

a. Ryu

While Dr. Carman testified that Ryu discloses a dual-chambered reservoir with the upper chamber termed the “pump driver” and the lower chamber the “water jacket,” Carman 1146:1322; 1147:3-10, 12-25; 1148:1-8; 1148:14-1149:21; 1150:17-20, Dr. Tilton disagreed, explaining that Ryu does not teach a dual-chambered reservoir, but rather describes two receptacles that are separate structural and functional components, Tilton 1441:24-1443:7; 1444:13-25. The experts agreed, however, that Ryu’s two chambers/components are connected to allow fluid to pass between them. Id. at 1442:22-1443:7; Carman 1142:13-1143:7.

Dr. Tilton further testified that Ryu neither describes nor suggests that the pump driver and water jacket can be manufactured together as one component, or that a person of ordinary skill in the art would have considered combining the two into a single component, because of the specific and demanding manufacturing requirements of the water jacket’s vacuum-brazed assembly. Id. at 1443:8-1444:12; see also ECF No. 238, Ex. 5 (depicting a vacuum-brazed structure like that used to form Ryu’s water jacket). Dr. Tilton also testified, however, that it was possible that Ryu’s two chambers/components could be made of the same material and therefore in a single piece. Tilton 1571:6-19.

Dr. Tilton and Eriksen agreed there are no functional differences between the cold plate, fan, and radiator disclosed in the ’362 and ’764 patents and those disclosed in Ryu. Eriksen 467:4-16; 468:11-14; Tilton 597:12-17.

b. Koga

Dr. Carman testified that Koga discloses a reservoir, with a pump room/chamber and a thermal exchange chamber labeled sucking channel 19. Carman 1255:9-1257:6; 1257:15-1259:2; 1259:18-1261:8; 1277:13-1278:3, 1279:2-1280:2; 1288:13-19. Dr. Tilton disagreed, testifying that Koga is a single-chambered device, where both pumping and thermal exchange occur in the pump room/reservoir. Tilton 1415:5— 1416:14. Dr. Tilton explained that though some negligible amount of heat exchange would occur between Koga’s sucking channel 19 and the heat-generating component of a computer, because “heat transfer will always happen between two bodies that are at ... different temperatures,” a person of ordinary skill in the art would not consider sucking channel 19 a thermal exchange chamber for the reasons discussed more fully in section H.A.4., infra. Tilton 1558:3-17. Rather, Dr. Tilton opined that heat exchange occurs in Koga’s pump room, where turbulent flow over dimples and pins produces the vast majority of thermal exchange that occurs in the device. Id. at 1415:5-19.

Dr. Carman also opined that Koga discloses an impeller having curved blades. Carman 1142:13-1143:7; 1153:3-20. Dr. Tilton did not dispute this opinion,

c. Jury’s findings

The jury apparently agreed with Dr. Tilton and Asetek that none of the prior art disclosed a single reservoir composed of two chambers; they adopted Asetek’s position on the jury verdict form with only one minor revision. See ECF No. 219 at 4 (“The prior art devices included a pump, a single-chambered reservoir (as that term was used in the prior art), and a cold plate as separate components.... Certain pri- or art devices had a pump and cold plate incorporated into a single swirl chamber, which provided no separation between the pumping and the heat exchange functional-ities of the liquid cooling device.”).

4. Differences between the prior art and the subject matter as a whole

Dr. Tilton explained that Koga and Ryu differ in several respects. In particular, Dr. Tilton explained that Koga does not disclose, teach, or suggest a dual-chambered reservoir, including separate pump and thermal exchange chambers, as recited in the ’764 patent. Tilton 1414:25-1416:14. Dr. Tilton also testified that Ryu is “a completely different invention in the same field of practice” as the devices disclosed in Asetek’s patents. Id. at 1441:24-1442:6. Specifically, nowhere does Ryu teach or suggest a dual-chambered reservoir comprising an upper/pump chamber and a lower/thermal exchange chamber; instead, Ryu describes two separate receptacles that are connected with screws or clips, or are laminated together. Id. at 1442:7-1443:7; 1443:12-1444:12.

The jury agreed with Asetek that material differences distinguished Asetek’s inventions from the prior art. See E.CF No. 219 at 4 (“Rather than connecting together multiple separate components (as in the prior art), Asetek’s patented pump head design combines, into a single unit, a pump and the claimed ‘reservoir’ that has, among other things, dual chambers and is bounded by a removable cold plate. Also, the claimed ‘reservoir’ in Asetek’s invention is a single receptacle that is divided into an upper chamber and a lower chamber, with the upper chamber providing the pumping function and the lower chamber providing the thermal exchange function.”).

5. Secondary considerations/objective indicia of non-obviousness

Evidence regarding secondary considerations of obviousness/objective indicia of non-obviousness was also adduced at trial. The evidence related to: (1) the commercial success of Asetek’s products due to the merits of the claimed invention; (2) a long-felt need for the solution that the claimed invention provides; (3) unsuccessful attempts by others to find the solution that the claimed invention provides; (4) copying of the'claimed invention; (5) unexpected and superior results of the invention; and (6) acceptance by others of the claimed invention, as shown by praise from others in the field or from the licensing of the claimed invention. The jury agreed that Asetek had proven the existence of all those indicia of non-obviousness. ECF No. 219 at 4.

a.Commercial success

Eriksen testified that Asetek’s commercial liquid cooling products have been a commercial success. Eriksen 281:18-284:11; 292:14-294:22; 297:15-301:2; 309:6-310:7; 318:3-319:5; 425:10-19. Ase-tek’s commercial liquid cooling products (currently sold as “Generation III” and “Generation IV” designs) embody the claimed invention of the ’362 and ’764 patents, and a nexus connects the merits of the claimed invention and the commercial success of Asetek’s liquid cooling products. Eriksen 309:6-310:7; 318:3-319:5; 425:10-19; Tilton 1536:10-1537:8; 1538:816. Dr. Carman did not testify that the commercial success of Asetek’s products was due to something other than the claimed invention.

b.Long-felt but unresolved need

Before Asetek released its products embodying the patented designs, the computing industry was facing a growing but unmet need for liquid cooling systems that would overcome the limitations of air-cooling and the deficiencies of prior art liquid cooling systems. Eriksen 319:24-332:20. Asetek’s patented products met this need. Id.

c.Unsuccessful attempts by others

Prior to Asetek’s commercial success, many in the computer liquid cooling industry, including Corsair, tried and failed to develop marketable closed-loop liquid cooling products. Eriksen 357:5-362:10. In particular, Corsair unsuccessfully attempted to sell liquid cooling products, but abandoned its unsuccessful efforts before teaming up with Asetek. Id. Similarly, Dr. Tilton’s company attempted to design a computer liquid cooling system, but was unable to make one that met cost and performance requirements. Tilton 580:4-16.

d.Copying

Cooler Master Co., Ltd./CMI USA and Zalman copied Asetek’s Generation III and Generation IV commercial products, respectively. Eriksen 373:20-379:17; 401:21-409:16; see, e.g., ECF No. 238-3 at 12-14, 16-17 (comparison of Asetek and CMI products).

e.Unexpected and superior results

Asetek’s patented dual-chamber reservoir design has many unexpected and superior results over prior art single-chamber designs. Eriksen 332:21-343:17; Tilton 577:25-578:7; 600:11-606:5.

f.Acceptance by others of the claimed invention

Asetek’s commercial liquid cooling products have received recognition and numerous awards from the computer industry, as well as government agencies. Eriksen 298:14-301:2; see, e.g., ECF No. 238-3 at 4-6. Several companies in the liquid cooling industry (Enermax, Swiftech, AVC) requested licenses to the ’362 and ’764 patents, Eriksen 432:22-438:8, and Corsair took a brief license to the patents, which was terminated and replaced by a covenant not to sue, id. at 437:18^138:2; 444:5-445:4.

g. Nexus between the claimed invention and commercial success/copying

As for the nexus between the claimed invention and the commercial success and copying of the product, Dr. Tilton testified that he never prepared claim charts comparing Asetek’s products to the language of the claims in the ’764 and ’362 patents, and that his discussion in his expert report of his conclusions regarding nexus was a single sentence in a footnote. Tilton 1574:14-1576:7.

At trial, however, Dr. Tilton testified that he examined examples of Asetek’s Generation III and Generation IV products by disassembling and analyzing their features, and that based on his examination, he determined that Asetek’s Generation III and IV liquid cooling products practice Asetek’s patented invention. Til-ton 1536:10-1537:3. Further, Dr. Tilton testified that he could not think of any unpatented features in Asetek’s products that were driving customer demand for the products. Id. at 1538:13-16. Finally, Dr. Tilton explained that the commercial success of Asetek’s desktop liquid cooling products is attributable to the unique characteristics of the patented invention, rather than to the mere inclusion of the claimed invention in products that are commercially successful for other reasons. Id. at 1537:4-8; 1538:8-12; see also Tilton 600:11-606:5.

As for evidence that others in the market copied aspects of the claimed invention, rather than merely unpatented features of Asetek’s products, Asetek presented evidence that the accused Sei-don products were copies of Asetek’s patented Generation III pump head design. Eriksen 373:20-379-25; see also ECF No. 238-3 at 12-14, 16-17 (comparison of Asetek and CMI products).

6. Motivation to combine

Dr. Carman testified that one of ordinary skill in the art would have been motivated to combine Ryu with Koga and/or Laing because each of these references is directed to the field of liquid cooling, each tries to solve the same problem, and combining these prior art elements according to known methods would have yielded predictable results. Carman 1161:5-1162:4.

Dr. Tilton testified that the claimed inventions are not simply combinations of three prior art elements — a reservoir, a pump, and a cold plate — into a single unit. Tilton 1411:24-1412:24. Rather, the inventions cover “very specific geometric structures, methods of construction, materials of construction, the way that the fluid moves in the device, [and] the types of heat transfer surfaces that are used.” Id. Significant novel engineering was involved in the design and development of the “dual-chambered reservoir bounded by a cold plate” concept and recited invention, and none of the prior art references CMI has cited describes a dual-chambered reservoir. Id. at 1414:4-12; see also Eriksen 287:2-5; 289:1-290:7; 319:6-339:1; 339:22-343:1 (explaining the process of developing the claimed inventions).

II. CONCLUSIONS OF LAW

A. Obviousness

1. Generally

A patent is invalid for obviousness 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). Obviousness is a question of law premised on four factual considerations: (1) the scope and content of the prior art; (2) the differences between the prior art and the claimed subject matter as a whole; (3) the level of ordinary skill in the art; and (4) objective indicia of non-obviousness, also known as secondary considerations. KSR Int’l Co. v. Teleflex Inc., 550 U.S. 398, 406-07, 127 S.Ct. 1727, 167 L.Ed.2d 705 (2007) (citing Graham v. John Deere Co., 383 U.S. 1, 17-18, 86 S.Ct. 684, 15 L.Ed.2d 545 (1966)). Because patents are presumed valid, 35 U.S.C. § 282(a), the party asserting a patent’s invalidity bears the burden of proving it by clear and convincing evidence. Pfizer, Inc. v. Apotex, Inc., 480 F.3d 1348, 1359 (Fed.Cir.2007).

Obviousness is evaluated from the state of the art as it existed at the time of the alleged invention. 35 U.S.C. § 103(a). Courts must be cautious not to look at the invention through the lens of hindsight. KSR, 550 U.S. at 421, 127 S.Ct. 1727; Star Scientific, Inc. v. R.J. Reynolds Tobacco Co., 655 F.3d 1364, 1375 (Fed.Cir.2011).

A conclusion of obviousness requires at least a suggestion of all the limitations in a claim by the prior art. CFMT, Inc. v. Yieldup Int’l Corp., 349 F.3d 1333, 1342 (Fed.Cir.2003) (citation omitted). A claim that depends from a non-obvious independent claim is non-obvious because it contains all the limitations of the independent claim, plus a further limitation. In re Fine, 837 F.2d 1071, 1076 (Fed.Cir.1988) (citations omitted); Hartness Int’l Inc. v. Simplimatic Eng’g Co., 819 F.2d 1100, 1108 (Fed.Cir.1987) (citation omitted); see 35 U.S.C. § 112(d) (“A claim in dependent form shall be construed to incorporate by reference all the limitations of the claim to which it refers.”).

An invention is not obvious under section 103 “just because it was obvious ‘to explore a new technology or general approach that seemed to be a promising field of experimentation, where the prior art gave only general guidance as to the particular form of the claimed invention or how to achieve it.’” Procter & Gamble Co. v. Teva Pharm. USA, Inc., 566 F.3d 989, 997 (Fed.Cir.2009) (quoting In re O’Farrell, 853 F.3d 894, 903 (Fed.Cir.1988)). The nature of the problem to be solved by the invention, however, can provide the motivation to combine teachings from different references to arrive at the claimed system. Ruiz v. A.B. Chance Co., 357 F.3d 1270, 1276 (Fed.Cir.2004) (citations omitted). And simply arranging old elements with each performing the same function it is already known to perform is not patentable. KSR, 550 U.S. at 417, 127 S.Ct. 1727 (citation omitted).

2. Objective indicia of non-obviousness/secondary considerations

Objective evidence of non-obviousness is “often ... the most probative and cogent evidence” available to a court evaluating the question of obviousness. Ortho-McNeil Pharm., Inc. v. Mylan Labs., Inc., 520 F.3d 1358, 1365 (Fed.Cir.2008) (quoting Catalina Lighting, Inc. v. Lamps Plus, Inc., 295 F.3d 1277, 1288 (Fed.Cir.2002)). These secondary considerations may include commercial success, long-felt but unsolved need, or the prior failure of others. Graham, 383 U.S. at 17, 86 S.Ct. 684. Other objective indicia include whether the prior art teaches away from the invention, whether others have copied the invention, whether the invention produces unexpected or superior results, and whether the invention has received industry acclaim. See Ecolochem, Inc. v. S. Cal. Edison Co., 227 F.3d 1361, 1376-80 (Fed.Cir.2000), cert. denied, 532 U.S. 974, 121 S.Ct. 1607, 149 L.Ed.2d 473 (2001); Specialty Composites v. Cabot Corp., 845 F.2d 981, 991 (Fed.Cir.1988) (citations omitted). “To be afforded substantial weight, [ ] objective indicia of non-obviousness must be tied to the novel elements of the claim at issue.” Institut Pasteur & Universite Pierre et Marie Curie v. Focarino, 738 F.3d 1337, 1347 (Fed.Cir.2013) (citing In re Kao, 639 F.3d 1057, 1068 (Fed.Cir.2011)).

Evidence of a long-felt and unresolved need in the industry for the solution offered by the patented invention supports a finding that the invention was not obvious at the time the invention was made. Procter & Gamble, 566 F.3d at 998. “[C]opying the claimed invention, rather than one within the public domain, is [also] indicative of non-obviousness.” Windsurfing Int’l Inc. v. AMF, Inc., 782 F.2d 995, 1000 (Fed.Cir.1986) (citations omitted).

To indicate non-obviousness, the commercial success of the product must be due to the merits of the claimed invention, beyond what was readily available in the prior art. J.T. Eaton & Co. v. Atl. Paste & Glue Co., 106 F.3d 1563, 1571 (Fed.Cir.1997). When the patentee has demonstrated commercial success and “the successful product is the invention disclosed and claimed in the patent, it is presumed that the commercial success is due to the patented invention.” Id. The challenger bears the burden to prove that the commercial success is instead “due to extraneous factors Sther than the patented invention, such as advertising, [or] superi- or workmanship.... ” Demaco Corp. v. F. Von Langsdorff Licensing Ltd., 851 F.2d 1387, 1393 (Fed.Cir.1988). The party asserting invalidity must provide evidence to rebut the presumed nexus between the patented invention and commercial success. Winner Int’l Royalty Corp. v. Wang, 202 F.3d 1340, 1351-52 (Fed.Cir.2000); Demaco, 851 F.2d at 1393.

Unexpected superior properties of an invention suggest that the invention was not obvious to one of ordinary skill in the art at the time of the claimed invention, because “that which would have been surprising to a person of ordinary skill in a particular art would not have been obvious.” In re Soni, 54 F.3d 746, 750 (Fed.Cir.1995); see also Procter & Gamble, 566 F.3d at 997. Unexpected results that inherently flow from a claimed invention are evidence of non-obviousness of the invention that need not be described in the patent’s text. Knoll Pharm. Co. v. Teva Pharms. USA, Inc., 367 F.3d 1381, 1385 (Fed.Cir.2004).

“Praise for the invention, including awards accorded to the inventors for their invention, [is] further evidence of the” non-obviousness of the invention. Corning Glass Works v. Sumitomo Elec. U.S.A. Inc., 671 F.Supp. 1369, 1398 (S.D.N.Y.1987), aff'd, 868 F.2d 1251 (Fed.Cir.1989). Appreciation of the invention by those of ordinary skill in the art is further evidence that the invention was not obvious when it was invented. See, e.g., Vulcan Eng’g Co. v. Fata Aluminium, Inc., 278 F.3d 1366, 1373 (Fed.Cir.2002); In re Piasecki, 745 F.2d 1468, 1473-74 (Fed.Cir.1984). Licensing of the patented invention by others in the industry also supports a finding of non-obviousness, as it tends to show industry recognition. Institut Pasteur, 738 F.3d at 1344, 1346-67.

3. Weight to be given expert testimony

The Court must rely substantially on expert testimony to resolve the issue of obviousness. Indeed, in cases involving complex technology, expert testimony is necessary to establish invalidity on grounds of obviousness. Proveris Scientific Corp. v. Innovasystems, Inc., 536 F.3d 1256, 1260, 1267 (Fed.Cir.2008).

Given the respective qualifications and experience of Drs. Tilton and Carman, the Court finds that, generally, Dr. Tilton’s testimony regarding computer liquid cooling system technology and the level of ordinary skill of a practitioner in the art is entitled to greater weight than is Dr. Carman’s. See Crom Corp. v. Crom, 677 F.2d 48, 51 (9th Cir.1982) (concluding that the district court properly permitted expert testimony, but cautioned the jury specifically that the expert’s lack of experience in the patented technology was a factor for the jury to consider in assessing the weight to be given the expert’s testimony); Quiet Tech. DC-8, Inc. v. Hurel-Dubois UK Ltd., 326 F.3d 1333, 1341 (11th Cir.2003) (acknowledging that an expert’s qualifications may bear on the reliability of the proffered testimony); see also ECF No. 126 at 2-4 (explaining in order on motion to exclude Dr. Carman’s testimony that Dr. Carman’s experience in the field of liquid cooling systems for computers is a consideration that goes to the weight of his testimony) (citation omitted).

While Dr. Carman certainly has impressive qualifications, and the Court has no doubt that he is able to understand and apply the thermodynamic and mechanical sciences underlying the claimed inventions, Dr. Tilton has significantly more firsthand experience in this particular technology. He therefore has more background knowledge underlying his opinions about the technology and the perspective of a person of ordinary skill in the art than does Dr. Carman. Finally, having observed the testing of both witnesses on cross-examination, the Court finds Dr. Tilton’s testimony in its totality to be the more credible.

4. ’764 Patent

a. The prior art

The Court has considered the full scope of CMI’s obviousness arguments related to the ’764 patent and finds them unpersuasive. CMI has not established by clear and convincing evidence that the asserted claims of the ’764 patent are obvious based on Ryu in combination with Koga and/or Laing. Rather, the Court is persuaded by substantial evidence that Koga, Ryu, and/or Laing do not teach, disclose, or suggest each and every limitation of the asserted claims of the ’764 patent. Accordingly, the Court concludes that the prior art, and in particular Ryu and Koga, do not render the ’764 patent invalid for obviousness.

Specifically, the Court .concludes that CMI has not proven, by clear and convincing evidence, that Koga discloses, suggests, or teaches a dual-chambered reservoir, including separate pump and thermal exchange chambers, all of which are required for each of the asserted claims of the ’764 patent. Dr. Tilton testified that Koga discloses a single-chambered device, where both pumping and thermal exchange occur, not a dual-chambered device with separate pump and thermal exchange chambers that, in combination, form a reservoir. Tilton 1415:5-1416:14; 1422:23-1424:13;1424:15-1425:2; 1429:13-1430:5. The jury agreed. See ECF No. 219 at 3-4. And so long as the jury’s implicit and explicit factual findings regarding the scope and content of the prior art, and the differences between the claimed invention and the prior art, are supported by substantial evidence — which they are, given Dr. Tilton’s testimony — the Court must accept those findings. Kinetic Concepts, Inc. v. Smith & Nephew, Inc., 688 F.3d 1342, 1360 (Fed.Cir.2012). Thus, despite Dr. Carman’s testimony to the contrary, the Court finds that Koga is a single-chambered device that lacks separate pump and thermal exchange chambers.

Furthermore, the Court concludes that CMI has not shown that a person of ordinary skill in the art would understand Koga’s sucking channel 19 to constitute a thermal exchange chamber — a limitation of all the asserted claims of the ’764 patent. This is true for several reasons. First, all indications are that the primary purpose of sucking channel 19 is as a conduit to deliver cooling fluid to the rotational center of Koga’s pump room. See Tilton 1416:18-1417:9; 1417:23-1418:25; 1429:3-12; Jury Question & Carman 1645:3-13 (“The primary purpose [of sucking channel 19] is to pass fluid to the pump room”); Tr. Ex. 535 (Koga) at 4:57-67. Second, the amount of heat that could be drawn off'a heat-generating component by thermal exchange in sucking channel 19 would be inconsequential, because sucking channel 19 is a narrow-diameter channel with very little surface area available to absorb heat, and because sucking channel 19 is simply a flow-through conduit that does not permit coolant enough time to absorb and accumulate heat from a heat-generating component. Tilton 1417:23-1418:25; 1419:8-24; 1427:11-1428:24. Third, Koga teaches away from having the sucking channel sit on top of and be in thermal contact with the heat-generating component, as would be required for effective heat transfer and thus cooling. Tilton 1419:1-1422:17; 1438:9-1439:5; Tr. Ex. 535 (Koga) at 8:47-53, 10:33-40. And fourth, Koga does not disclose or suggest that the interior of sucking channel 19 exhibits heat-exchange features, as is required by dependent claim 4 of the ’764 patent. Tilton 1425:8-1426:6; 1436:181437:15; Carman 1335:9-1336:6; 1342:23-1345:17.

At bottom, CMI has not shown how sucking channel 19, which is not designed to induce any significant amount of heat exchange, should be deemed a “thermal exchange” chamber in a device whose quintessential function is to effect thermal exchange by removing heat from computer components that can only function properly under relatively cool conditions. CMI has not provided the Court with clear and convincing evidence that Koga discloses, suggests, or teaches a thermal exchange chamber. Asetek, on the other hand, points to substantial evidence that supports the jury’s verdict on this point. The Court agrees with the jury and with Dr. Tilton that Koga does not disclose a dual-chambered reservoir with sucking channel 19 serving as a thermal exchange chamber.

CMI also has not shown that Ryu discloses a reservoir — a receptacle or chamber for holding a liquid or fluid that includes a pump chamber and a thermal exchange chamber — as is required by all asserted claims of the ’764 patent. Dr. Tilton testified that Ryu is a device composed of two separate components that probably would not be manufactured as a single piece, not a single receptacle with two chambers. Tilton 1442:7-1444:25; 1506:20-1507:9. In particular, Dr. Tilton explained that a fundamental invention of Ryu is a “vacuum-brazed cold plate or water jacket that was superior to the state of the art at the time.” Id. at 1442:7-21. Vacuum brazing happens at extremely high temperatures under “strict guidance”; therefore, one of ordinary skill in the art would not consider making Ryu’s two components — pump driver 20 and vacuum-brazed water jacket 30 — as one component. Id. at 1443:21-1444:12.

Further, Dr. Tilton pointed out in his testimony that Ryu’s pump chamber and water jacket are not just separate components, but can be spatially separated and connected by tubing, yet still meet the functional requirements of the device, unlike the device disclosed in the ’764 patent. Tilton 1445:1-1447:21; see also Tr. Ex. 529 (Ryu). This testimony all suggests that Ryu does not disclose a reservoir containing two separate chambers, but rather is a two-component device without an individual reservoir for holding fluid.

Dr. Carman testified that Ryu does disclose a reservoir with two chambers, but after examining Ryu, the ’764 patent, and the rest of the testimony in this case, the Court finds substantial evidence to support the jury’s implicit conclusion that Ryu does not -disclose a dual-chambered reservoir. CMI has not met its burden to prove by clear and convincing evidence that Ryu discloses a reservoir with dual chambers.

Finally, CMI has not shown that one of ordinary skill in the art would combine Ryu and Koga to meet the limitation of “an impeller having curved blades,” as recited in claim 7 of the ’764 patent. Ryu discloses straight-edged blades that are not curved. See Tr. Ex. 529(Ryu), Fig. 4(c). And as Dr. Tilton explained, Ryu’s straight circulation blades are compatible with, and a logical design choice for, the magnetic field coupling between the motor and the pump impeller disclosed in Ryu. Tilton 1509:16-1511:19. Dr. Tilton further explained, however, that one of ordinary skill in the art would not have been motivated to modify Ryu in view of Koga by adding curved impeller blades, and that one of ordinary skill in the art would not have reasonably expected such a modification to work, because at the higher pressures and torques that would be achieved by substituting curved impeller blades in Ryu, the magnetically coupled driving mechanism would decouple the motor from the pump impeller, stopping fluid circulation. Id. at 1511:20-1512:11. For at least this reason, CMI and Dr. Carman have not persuaded the Court by clear and convincing evidence that it would be obvious or feasible to modify just Ryu’s impeller’s blade-shape without altering the rest of Ryu’s pump and other structures.

CMI has not shown that all limitations of the asserted claims of the ’764 patent are at least suggested in prior art references. See Yieldup, 349 F.3d at 1342.

b. Secondary considerations

The Court also concludes that the jury’s findings of the six objective indicia of non-obviousness Asetek sought to prove at trial are supported by substantial evidence. See section I.B.5., supra. Moreover, the Court finds substantial evidence to support the requisite nexus between the claimed invention and commercial success and copying by others, and CMI has not provided evidence that rebuts the presumption that such a nexus exists. See section I.B.5.g, supra; J.T. Eaton & Co., 106 F.3d at 1571 (explaining that when the patentee has demonstrated commercial success and “the successful product is the invention disclosed and claimed in the patent, it is presumed that the commercial success is due to the patented invention.”).

All six objective indicia of non-obviousness that the jury found indicate that the invention claimed in the ’764 patent was not obvious. This further supports the Court’s finding of non-obviousness,

d. Conclusion

Because CMI has not shown that all the limitations of the asserted claims of the ’764 patent are present in prior art references, and because all objective indi-cia of non-obviousness that were raised at trial indicate that the invention disclosed in the ’764 patent was not obvious, the Court concludes that CMI has not carried its burden to prove obviousness. The Court finds that the claims of the ’764 patent are not invalid for obviousness.

5. ’362 Patent

a. The prior art

CMI has also not shown that the ’362 patent is invalid for obviousness. Most notably, and as discussed more fully in section II.A.4, supra, with respect to the ’764 patent, neither Ryu nor Koga disclose a dual-chambered reservoir, a limitation of independent claims 14 and 17 of the ’362 patent (on which all other claims asserted here — claims 15, 18, and 19 — depend). See also Tilton 1522:5-25; 1530:9-23. Ryu’s pump driver 30 (the alleged upper chamber) and water jacket 20 (the alleged lower chamber) are separate receptacles or components that a person of ordinary skill in the art would not consider dual “chambers” within a single “reservoir.” Id. Accordingly, Ryu does not disclose or suggest the limitation “a reservoir configured to be coupled to the processing unit ... wherein the reservoir includes an upper chamber and a lower chamber,” as recited in claim 14, or the limitation “separably thermally coupling a heat exchanging interface of a reservoir with the electronic component ..., the reservoir including an upper chamber and a lower chamber,” as recited in claim 17. Also as discussed above, the jury appears to have agreed with Asetek, finding that no prior art reference disclosed a dual-chambered reservoir. See ECF No. 219 at 3-4. The jury’s finding in this regard is supported by substantial evidence.

Dr. Tilton also testified that Ryu does not disclose or suggest that the “heat exchanging interface” of the claimed invention is “removably attached [or coupled] to the reservoir,” as recited in claims 14 and 17 of the ’362 patent. Id. at 1523:17-1524:24; 1531:2-11. As Dr. Tilton explained, Ryu’s water jacket’s bottom boundary wall — i.e., Ryu’s heat exchanging interface — cannot be detached from the remainder of water jacket 20 because Ryu teaches that water jacket 20 is formed- by vacuum-brazing a plurality of aluminum plates into a single component with no detachable interfaces. Id. Dr. Carman agreed. Carman 1368:14-18 (“Q. If one wanted to remove just the boundary wall of water jacket 20, you couldn’t do that without sawing it off, or something like that; right? A. That’s correct.”).- Dr. Til-ton further explained that if water jacket 20 is removed, as suggested by Dr. Car-man, then the entire “lower chamber” and not just the “heat exchanging interface” would be removed or decoupled from Ryu’s alleged “reservoir.” Tilton 1523:17-1524:24; 1531:2-11. Dr. Carman agreed. Carman 1367:20-1368:23.

Dr. Carman relies on Laing to provide the limitation of a removable heat exchanging surface. Carman 1619:24-1620:1. But as Dr. Tilton explained, a person of ordinary skill in the art would not, with any reasonable expectation of success, modify Ryu in view of Laing to have a removable heat exchanging interface because Laing is a single-chamber device with a significantly different heat-exchange mechanism as compared to the device disclosed in Ryu. Tilton 1532:3-1533:25.

Given the foregoing, CMI has not shown by clear and convincing evidence that Ryu, even in combination with Koga or Laing, teaches or suggests the limitation “the heat exchanging interface being removably attached to the reservoir,” as recited in claim 14, or the limitation “the heat exchanging interface being removably coupled to the reservoir,” as recited in claim 17.

Further, as discussed in section U.A.4., supra, with respect to the ’764. patent, Ryu does not disclose or suggest an impeller having curved blades, a limitation of claims 14 and 17 of the ’362 patent. Tilton 1523:7-16. Dr. Carman conceded that Ryu does not disclose or suggest an impeller having curved blades, but relies on a combination with Koga to meet that limitation. See ECF No. 235 at 10. But for the reasons discussed in section II.A.4, supra, CMI has not persuaded the Court that a person of ordinary skill in the art would be motivated to modify Ryu to add the curved blades taught by Koga, or reasonably expect the combination of Koga and Ryu to function. Tilton 1535:22-1536:7.

Thus, at the least, CMI has failed to prove by clear and convincing evidence that any combination of prior art discloses, teaches, or suggests the limitations “a reservoir” including “an upper chamber and a lower chamber,” the “heat exchanging interface being removably attached [or coupled] to the reservoir,” and an “impeller having curved blades,” recited in independent claims 14 and 17 of the ’362 patent. For that reason, the Court finds that the invention disclosed in the asserted claims of the ’362 patent would not have been obvious to one of ordinary skill in the art at the time it was invented.

Additionally, the Court finds that neither Ryu nor Koga disclose, teach, or suggest the following limitation in claim 19 of the ’764 patent: “circulating the cooling liquid between the upper and lower chambers includes passing the cooling liquid from the upper chamber to the lower chamber through a single passageway of the one or more passageways.” Dr. Tilton explained that Ryu specifically teaches that the water in Ryu flows in the opposite direction: from water jacket 20, what CMI deems Ryu’s “lower chamber,” to pump driver 30, Ryu’s “upper chamber.” 1524:25-1525:25. CMI counters that Ryu also discloses that cooling liquid may be discharged from the (upper) pump driver to the (lower) water jacket, but the limitation in Ryu that CMI cites for this proposition states the contrary: “Also, the water passing through the [lower] water jacket 20 may be discharged to the [upper] pump driver 30.... ” Tr. Ex. 529(Ryu), at 5 (emphasis added). CMI has not shown by clear and convincing evidence that any combination of prior art teaches, discloses, or suggests this limitation.

b. Indicia of non-obviousness

As discussed in section II.A.4.b., supra, the Court also finds that Asetek has proven six objective 'indicia of non-obviousness. These weigh heavily in favor of a finding of non-obviousness. See Ortho-McNeil Pharm., 520 F.3d at 1365 (explaining that objective evidence of non-obviousness is “often ... the most probative and cogent evidence” available to a court evaluating the question of obviousness) (citation omitted).

In light of the objective indicia of non-obviousness that Asetek proved at trial, and the fact that CMI has not shown that prior art references disclose, teach, or suggest all limitations of the asserted claims of the ’362 patent, the Court finds that CMI has not carried its burden to prove that the ’362 patent is invalid for obviousness.

B. Section 112 Defenses

CMI contends that, pursuant to 35 U.S.C. § 112, the term “substantially circular” renders claims 14-16 of the ’362 patent invalid for (1) lack of an adequate written description, and (2) indefiniteness. ECF No. 234 at 15-16; ECF No. 235 at 23-24. The relevant portion of section 112 provides that a patent specification:

shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains ... to make and use the same.... The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the inventor ... regards as the invention.

35 U.S.C. § 112(a), (b). Asetek contends that CMI has waived its section 112 defenses, or in the alternative, that CMI has failed to carry its burden on both defenses. ECF No. 236 at 36-48. The Court agrees with Asetek.

1. Lack of written description

The essential question in assessing the adequacy of a patent’s written description is whether the description of the claimed invention would allow a person of ordinary skill in the art to recognize that the inventor invented what is claimed. See Ariad Pharms., Inc. v. Eli Lilly & Co., 598 F.3d 1336, 1355-56 (Fed.Cir.2010). The issue is a question of fact. Id. at 1355. Because the issue is one of fact, it is generally tried to a jury. See, e.g., id.) PIN/NIP, Inc. v. Platte Chem. Co., 304 F.3d 1235, 1243 (Fed.Cir.2002).

Here, the question of whether CMI waived its written description defense is straightforward. While CMI identified a written description defense in its pretrial statement, it did not elicit testimony regarding this theory at trial. It therefore adduced no evidence on the subject. Because CMI did not address indefiniteness at trial, Asetek was not aware that it had to develop evidence to rebut this defense; requiring Asetek to do so now would unfairly prejudice Asetek. See Fractus, S.A. v. Samsung Elecs. Co., 876 F.Supp.2d 802, 838 (E.D.Tex.2012) (finding that defendant waived its indefiniteness argument by failing to present testimony or other evidence in support of the defense at trial, and by failing to move for judgment as a matter of law on the defense at the close of its casein-chief or at the close of evidence; “Allowing Samsung to revive its defense post-trial deprives Fractus of any opportunity to substantively respond with its own testimony or evidence to Samsung’s alleged evidence of indefiniteness.”); Allergan, Inc. v. Barr Labs., Inc., 808 F.Supp.2d 715, 735 (D.Del.2011) (concluding that defendants waived certain obviousness theories by not raising them at trial and therefore could not “switch[] horses” in their post-trial motions and attempt to raise a new theory of obviousness; “As defendants did not allow [plaintiff] to mount a defense at trial to the [newly-asserted] theories, the court does not entertain them here.”) (citation omitted). Moreover, CMI’s actions were insufficient to place the Court on notice that CMI was pursuing the defense at trial. Cf. Marine Polymer Techs, v. HemCon, Inc., No. 06-cv-100-JD, 2010 WL 840470, at *1 (D.N.H. Mar. 3, 2010) (“claims, defenses, theories, and arguments must be articulated and be presented with proper support in order for them to be considered by the court.... As in all cases, matters referred to in a perfunctory manner, ... without developed argumentation, are deemed to be waived.”).

More to the point, CMI affirmatively withdrew its written-description defense from the final jury instructions and jury verdict form before either went to the jury. Cf. Jamesbury Corp. v. Litton Indus. Prods., Inc., 756 F.2d 1556, 1564 (Fed.Cir.1985) (finding waiver of an invalidity defense based on removal of jury instructions and a following oral concession at trial). And because the adequacy of a patent’s written description is a question of fact, and Asetek demanded a jury trial as to all questions of fact, it would violate Asetek’s Seventh Amendment right to a jury trial for the Court to even consider this defense post-trial without the jury having rendered a verdict on the topic.

Accordingly, the Court finds that CMI waived its lack-of-written description defense by choosing not to pursue it at trial. See MeadWestVaco Corp. v. Rexam Beauty & Closures, Inc., 731 F.3d 1258 (Fed.Cir.2013) (concluding that defendants waived an indefiniteness defense at trial by failing to raise it at trial); Lisle Corp. v. A.J. Mfg. Co., 398 F.3d 1306, 1317 (Fed.Cir.2005) (same). Because CMI waived the defense and failed to present evidence regarding the adequacy of the ’362 patent’s written description at trial, the Court will not address the substance of that defense.

2. Indefiniteness

CMI also asserts indefiniteness as a defense in its post-trial briefing. A court may conclude, as a matter of law, that “a patent is invalid for indefiniteness if its claims, read in light of the specification delineating the patent, and the prosecution history, fail to inform, with reasonable certainty, those skilled in the art about the scope of the invention.” Nautilus, Inc. v. Biosig Instruments, Inc., —— U.S. -, 134 S.Ct. 2120, 2124, 189 L.Ed.2d 37 (2014); BJ Servs. Co. v. Halliburton Energy Servs., Inc., 338 F.3d 1368, 1372 (Fed.Cir.2003) (citations omitted). While the scope of patent claims is a legal question arising from the Court’s duty to construe patent claims, certain factual questions underlying the issue of indefiniteness often must be determined by a jury. See BJ Servs., 338 F.3d at 1372; Tech. Licensing Corp. v. Videotek, Inc., 545 F.3d 1316, 1338 (Fed.Cir.2008) (citations omitted). Furthermore, where the substance of an invalidity defense is sufficiently complex, expert testimony is necessary for the court to evaluate the defense. See Proveris, 536 F.3d at 1267-68 (finding no abuse of discretion where the district court required expert testimony on invalidity where the subject matter of the patent was sufficiently complex to fall beyond the grasp of an ordinary layperson).

CMI now argues that the ’362 patent fails to provide a sufficient description of the term “substantially circular,” ECF No. 234 at 15-16, but the argument comes too late. Judge Chen instructed CMI that its indefiniteness defense was best raised at summary judgment, but CMI did not raise it then — even though it raised other defenses. CMI did mention the issue in its pre-trial papers, without specifying its theories. At trial, however, CMI sought only to prove obviousness and anticipation, and it failed to elicit any testimony regarding indefiniteness of the term “substantially circular.” It removed the relevant jury instruction from the set considered by the Court. And it stood mute when Ase-tek reasonably stated its understanding that CMI had withdrawn the defense. When CMI moved for judgment as a matter of law as to all issues for which Asetek bore the burden of proof, it did not seek judgment relating to indefiniteness. Ase-tek could not have guessed that it should submit rebuttal evidence on the issue.

Given these circumstances, neither Ase-tek nor the Court was put on adequate notice that indefiniteness was a live issue at trial, see Marine Polymer, 2010 WL 840470, at *1, and Asetek did not have an adequate opportunity to develop rebuttal evidence at trial, see Allergan, 808 F.Supp.2d at 735; Fractus, 876 F.Supp.2d at 838. Further, because CMI did not produce affirmative evidence regarding indefiniteness of the term “substantially circular,” and Asetek did not have the opportunity to rebut CMI’s evidence on the issue, the Court lacks expert testimony on which to rely to resolve the legal question of indefiniteness. See Proveris, 586 F.3d at 1267-68. And to the extent underlying factual questions had to be resolved — such as what a person of ordinary skill in the art reading the claims would understand — the jury did not have the opportunity to hear evidence pertaining to those questions, nor did the jury have the opportunity ultimately to resolve them. Because of the foregoing, the Court finds that CMI waived its defense of indefiniteness by not pursuing it at trial.

The Court also finds that, even if waiver did not preclude CMI from asserting indefiniteness, CMI would not prevail on that defense because: (1) CMI adduced no evidence at trial regarding indefiniteness as it pertained to the term “substantially circular,” which is the only term it relies on in its post-trial briefing; (2) evidence from experts is necessary to help the Court assess what a person of ordinary skill in the art would know or find indefinite; and (3) CMI bears the burden of establishing invalidity due to indefiniteness. As a result, even if the Court did not find waiver, the Court would be compelled to find that CMI did not carry its burden to prove, by clear and convincing evidence, that Asetek’s patents are invalid for indefiniteness.

CONCLUSION

For the foregoing reasons, the Court concludes that CMI has failed to show by clear and convincing evidence that the ’764 and ’362 patents are invalid for obviousness, lack of written description, or indefiniteness. The jury having found that CMI’s products infringe all asserted claims of the ’362 and ’764 patents, the Court hereby enters judgment in favor of Asetek and against CMI. Asetek shall submit to the Court a proposed form of final judgment within ten days of the issuance of this order.

IT IS SO ORDERED. 
      
      . CMI did, however, elicit some indefiniteness testimony from Dr. Tilton as it related to the term “removably attached.” ECF No. 234 at 15; ECF No. 236 at 42 n.6; Tilton 1568:12-1570:2.
     
      
      . The parties do not dispute that U.S. Patent No. 7,554,049 to Koga et al. ("Koga”), Korean Patent No. 20-0314041 to Ryu ("Ryu”), and U.S. Publication No.2004/0052663 to La-ing et al. ("Laing”) are prior art to Asetek's patents. ECF No. 235 at 4; ECF No. 236, HHT9-27.
     
      
      . The jury also determined that Asetek was entitled to $404,941 in damages, representing a 14.5% royalty rate. ECF No. 219 at 5. The jury premised this determination on the notion that neither the '362 nor the ’764 patent is invalid.
     
      
      . The parties also discuss the fact that in inter partes review by the U.S. Patent and Trademark Office ("PTO”), an examiner found that all claims of the '764 patent were invalid as anticipated by Koga. See ECF No. 235 at 13; ECF No. 236 at 13-14. Because an inter partes review examiner makes a determination using a lesser standard of proof than does the Court — preponderance of the evidence, rather than clear and convincing evidence — and because an examiner must give the prior art the broadest reasonable interpretation, In re Oetiker, 977 F.2d 1443, 1445 (Fed.Cir.1992); Therasense, Inc. v. Becton, Dickinson & Co., 649 F.3d 1276, 1291-92 (Fed.Cir.2011) (citation omitted), the Court finds that the PTO's conclusions are not relevant to the Court’s determination here. See also ECF No. 126 at 11 (declining to rely on findings of the PTO examiner at summary judgment).
     
      
      . Of course, in a case tried to a jury, only the jury enjoys the role of choosing the weight it assigns to witness testimony as it pertains to matters of fact, and courts must be careful not to invade that province. Apple Inc. v. Motorola, Inc., 757 F.3d 1286, 1314 (Fed.Cir.2014). But in this case, the Court also has a role in making legal decisions based at least in part on expert testimony; when making those decisions, the Court must assign relative weights to conflicting expert testimony. In any event, it appears that the jury assigned more weight to Dr. Tilton’s testimony than Dr. Carman's with respect to all of the jury's factual findings: the jury adopted Asetek’s position, with only minor variations, on all factual issues the jury decided. See ECF No. 219.
     
      
      . Dr. Carman testified that a person of ordinary skill in the art would be motivated to combine Koga with Ryu and/or Laing to solve the problem the claimed invention was directed to. See Carman 1161:5-1162:4. Even if some combination of prior art disclosed all of the limitations of the patents-in-suit, the Court finds that Dr. Carman's testimony on this point was conclusory and unpersuasive. See, e.g., InTouch Techs., Inc. v. VGO Commc'ns, Inc., 751 F.3d 1327, 1352 (Fed.Cir.2014) (finding insufficient an expert's obviousness testimony that "primarily consisted of conclu-sory references to her belief that one of ordinary skill in the art could combine [certain prior art] references, not that they would have been motivated to do so.”) (emphases and citation omitted); Motorola, Inc. v. Interdigital Tech. Corp., 121 F.3d 1461, 1473 (Fed.Cir. 1997) (choosing not to rely on conclusory expert testimony regarding invalidity) (citations omitted). Dr. Tilton's testimony was significantly more detailed and persuasive. See, e.g., Tilton 1411:24-1412:24.
     
      
      . Courts apply Federal Circuit precedent, rather than regional circuit precedent, to issues that are unique to patent law. In re Spalding Sports Worldwide, Inc., 203 F.3d 800, 803-04 (Fed.Cir.2000). While waiver, as a general principle, is not unique to patent law, courts in this district have applied Federal Circuit precedent to the question of whether a patent-law-specific defense is waived. See, e.g., Bd. of Trs. of Leland Stanford Univ. v. Roche Molecular Sys., Inc., 237 F.R.D. 618, 622-24 (N.D.Cal.2006). Courts in other circuits also apply Federal Circuit precedent to evaluate the waiver of validity defenses in patent cases. See Allergan Inc. v. Barr Labs., Inc., 808 F.Supp.2d 715, 735 (D.Del.2011), aff'd, 501 Fed.Appx. 965 (Fed.Cir.2013) (obviousness defense); Fractus, S.A. v. Samsung Electronics Co., LTD., 876 F.Supp.2d 802, 838 (E.D.Tex.2012) (indefiniteness defense); Cubist Pharms., Inc. v. Hospira, Inc., 75 F.Supp.3d 641, 673-74, 2014 WL 6968046, at *23 (D.Del.2014) (derivation defense). Thus here, to the extent it is available, the Court applies the law of the Federal Circuit to determine whether CMI waived its indefiniteness and written description defenses.
     
      
      . The Court notes, however, that CMI elicited trial testimony from Dr. Tilton regarding the term "substantially circular” — i.e., his statement that it was "probably correct” that the term "substantially circular” did not appear in any of the original sixty-nine claims in the original application that issued as the '362 patent. Tilton 679:10-16. This is an insufficient basis on which to find a patent invalid for lack of written description: the failure to use a specific term in the specification of a patent does not render the patent invalid for an inadequate written description so long as a person of ordinary skill in the art would recognize the meaning of the term as it relates to the claimed invention. All Dental Prodx, LLC v. Advantage Dental Prods., Inc., 309 F.3d 774, 779 (Fed.Cir.2002); TV Interactive Data Corp. v. Sony Corp., No. C-10-0475-PJH, 2012 WL 6020113, at *4 (N.D.Cal. Dec. 3, 2012) (citation omitted). Here, Dr. Tilton testified that a person of ordinary skill in the art would understand the meaning of "substantially circular,” despite its omission from the patent specification. Tilton 616:10-617:9; see also 615:11-22. CMI did not provide evidence to the contrary.
     
      
      . As mentioned in note 2, supra, CMI did attempt to elicit evidence regarding indefiniteness as it related to the term "removably attached.” See Tilton 1568:12-1570:2. But CMI’s expert did not opine in his expert report that the term "removably attached” was indefinite, see ECF No. 99-7, and thus that theory was not one that CMI could properly pursue at trial. ECF No. 201 (granting motion to preclude trial testimony outside the scope of Dr. Carman’s expert report). Moreover, in its post-trial briefing, CMI only asserts indefiniteness based on the term "substantially circular.” Thus, the brief testimony CMI was able to elicit regarding indefiniteness of the term "removably attached” is not relevant here.
     
      
      . "Any findings of fact in the foregoing order that constitute conclusions of law shall be deemed to have been found by the Court as a matter of law. Conversely, any conclusions of law that constitute findings of fact shall be deemed to have been found by the Court as a matter of fact.” Takeda Pharm. Co. v. Handa Pharms., LLC, Nos. C-11-00840 JCS, C-11-01609 JCS, C-11-01610 JCS, 2013 WL 9853725, at *4 n. 1 (N.D.Cal. Oct. 17, 2013); see also Break-Away Tours, Inc. v. British Caledonian Airways, 704 F.Supp. 178, 182 (S.D.Cal.1988) (same).