Federal Circuit
Subscribe to Federal Circuit's Posts

No First Place Trophy Here: Public Demo at Trade Show Found Invalidating

Addressing the public use bar of pre-America-Invents-Act (AIA) 35 U.S.C. § 102(b), the US Court of Appeals for the Federal Circuit affirmed a district court’s decision to invalidate a patent because the patent owner’s disclosure of a prior art device at a trade show more than one year before the patent’s priority date was an invalidating prior public use. Minerva Surgical, Inc. v. Hologic, Inc., Case No. 21-2246 (Fed. Cir. Feb. 15, 2023) (Prost, Reyna, Stoll, JJ.)

Minerva sued Hologic for infringement of a patent directed to surgical devices for a procedure called endometrial ablation, which stops or reduces abnormal uterine bleeding. The patent had a priority date of November 7, 2011, and the asserted claim included the term “the inner and outer elements have substantially dissimilar material properties” (SDMP term). The district court construed the SDMP term to mean that the “inner and outer frame elements have different thickness and different composition.”

On completion of discovery, Hologic moved for summary judgment of invalidity, arguing that the asserted patent claims were anticipated under the public use bar of pre-AIA § 102(b). According to Hologic, more than a year before the patent’s priority date, Minerva brought a device called Aurora to the 38th Global Congress of Minimally Invasive Gynecology sponsored by the American Association of Gynecologic Laparoscopists (AAGL 2009)—an event dubbed the “Super Bowl of the industry.” During the AAGL 2009 conference, Minerva had a booth with 15 fully functional Aurora devices, gave a presentation discussing the Aurora devices and distributed brochures. In light of the record, the district court granted summary judgment that the asserted claims were anticipated under the public use bar. Minerva appealed.

Minerva raised three arguments on appeal. First, Minerva argued that disclosure of the Aurora device at AAGL 2009 was not a “public use” because Minerva “merely displayed” the device. Second, Minerva argued that there was no disclosure of the “invention” of the asserted claim because the Aurora device disclosed at AAGL 2009 lacked the SDMP term. Third, Minerva argued that the invention was not “ready for patenting” because Minerva was still improving the SDMP technology at the time of AAGL 2009, so the device did not function for its intended purpose of ablating “live human” tissue. The Federal Circuit addressed each argument in turn.

The Federal Circuit found that the district court had correctly determined that the Aurora device at AAGL 2009 was a “public use” since it was shown to individuals other than the inventor under no limitation, restriction or obligation of confidentiality. The undisputed record showed that Minerva pitched the Aurora device to various sophisticated industry members, who were allowed, without confidentiality obligations, to scrutinize the Aurora device closely enough to recognize and understand the SDMP technology Minerva later sought to patent.

The Federal Circuit also concluded that the Aurora device disclosed the SDMP term. The Court found that the inventors conceived of the SDMP technology before AAGL 2009 and that documentation about the Aurora device from before and shortly after the event [...]

Continue Reading




read more

Patenting a Nice Cool Glass of Nicotinamide Riboside? Claims Covering Milk Invalid under § 101

The US Court of Appeals for the Federal Circuit found that claims covering a naturally occurring composition were not patent eligible under 35 U.S.C. § 101 merely because one component of the composition had been “isolated.” ChromaDex, Inc. v. Elysium Health, Inc., Case No. 2022-1116 (Fed. Cir. Feb. 13, 2023) (Chen, Prost, Stoll, JJ.)

ChromaDex sued Elysium (a former ChromaDex customer) for infringement of its patent directed to dietary supplements containing nicotinamide riboside (NR). Elysium moved for summary judgment, arguing that the asserted claims were invalid under the § 101 prohibition against patenting natural phenomena. After the district court granted summary judgment, ChromaDex appealed.

The asserted claims were directed to a composition comprising:

  • Isolated NR
  • One or more of tryptophan, nicotinic acid or nicotinamide
  • One of 22 carriers
  • Increased NAD+ biosynthesis after eating.

Both parties conceded that milk satisfies every element of the asserted claims with the exception that its NR is not “isolated.” Both parties also conceded that milk is a naturally occurring material and thus not patent eligible under § 101.

On these facts, the issue presented was whether the claim limitation that the NR must be “isolated” (which does not occur in nature) was sufficient to make the claims patent eligible. The Federal Circuit responded “no.”

The Federal Circuit analyzed the asserted claims under two tests: the “markedly different characteristics” test set out in Chakrabarty, and the Alice two-step test (unsure whether Chakrabarty remains controlling precedent).

Under the Chakrabarty test, a claimed composition is not a natural phenomenon if it has “markedly different characteristics” from what occurs in nature. The Federal Circuit found that ChromaDex’s claimed composition had no markedly different characteristics from natural milk. While ChromaDex argued that isolation potentially allowed for unnaturally high concentrations of NR, the claims did not require such concentrations. The claims included compositions structurally and functionally identical to milk and therefore failed the “markedly different characteristics” Chakrabarty test.

Proceeding to the two-part Alice test, under step 1 the Federal Circuit found that the claims were directed to a product of nature because there were no structural differences between the claimed composition and natural milk. Under step two, the Court found that there was no “inventive step” because the claims were merely directed to increasing NAD+ biosynthesis, which was a natural principle that resulted from drinking milk.

Practice Note: During claim drafting, care should be taken to avoid claims that encompass all structural and functional components of a naturally occurring material.




read more

Review Delayed Is Not Review Denied

Considering whether the US Patent & Trademark Office (PTO) Director must complete review of the Patent Trial & Appeal Board’s (Board) inter partes review (IPR) decision within the statutory deadline for a final written decision, the US Court of Appeals for the Federal Circuit concluded that the statute imposes no such requirement. CyWee Group Ltd. v. Google LLC et al., Case Nos. 20-1565, -1567 (Fed. Cir. Feb. 8, 2023) (Prost, Taranto, Chen, JJ.).

In 2018, Google filed two IPR petitions challenging certain claims of CyWee’s patents. The Board issued its final written decisions in January 2020, determining that all challenged claims were unpatentable for obviousness. CyWee appealed to the Federal Circuit in March 2020. In addition to challenging the patentability decision, CyWee challenged the appointment of Board administrative patent judges (APJs) as unconstitutional in view of the Appointments Clause. In March 2021, the Court affirmed the Board’s decisions and rejected CyWee’s constitutional challenge. The Court issued its mandate on June 10, 2020.

Eleven days later, the Supreme Court of the United States issued its decision in United States v. Arthrex, Inc., holding that APJs’ power to render final patentability decisions unreviewable by an accountable principal officer gave rise to an Appointments Clause violation but this violation could be remedied by, among other things, remanding to the acting PTO Director to decide to rehear the case. In response to a request from CyWee, the Federal Circuit recalled the mandate and remanded “for the limited purpose of allowing CyWee the opportunity to request Director rehearing of the final written decisions,” and required CyWee to inform the Court within 14 days of any decision denying rehearing. On remand, the Commissioner for Patents denied rehearing and ordered that the already-issued final written decisions were final decisions of the PTO. CyWee appealed.

CyWee contended that the post-Arthrex, mandated review by the PTO Director was untimely—and thus violative of due process—because the PTO Director did not have the ability to review the institution decision and final written decision within their respective three-month and one-year statutory deadlines. The Federal Circuit disagreed, calling CyWee’s contentions “meritless.” Rather, the Court found that because the PTO Director had permissibly delegated to the Commissioner for Patents authority to render institution and final decisions to the Board, those decisions were timely so long as the PTO Director’s delegees rendered them within the statutorily prescribed periods. By contrast, the PTO Director’s final review authority—a constitutional necessity born from Arthrex—has no similar statutory deadline.

CyWee also argued that the PTO Director’s later review was too late to satisfy a general requirement that the PTO Director consider the effect of regulations on the PTO’s ability to timely complete instituted IPRs. The Federal Circuit rejected this argument too, finding that even if the statute imposed a general timeliness requirement that was subject to judicial review, nothing about the process afforded to CyWee would have violated such a requirement.

With a different spin on the timeliness issue, CyWee also argued that the Board’s extension [...]

Continue Reading




read more

You Can’t Skirt around Obviousness by Arguing Expectation of Success Must Be Absolute

Affirming an obviousness decision by the Patent Trial & Appeal Board (Board), the US Court of Appeals for the Federal Circuit explained that the expectation of success need only be reasonable and not absolute. Transtex Inc. v. Vidal, Case No. 20-1140 (Fed. Cir. Feb. 3, 2023) (Prost, Reyna JJ.) (Schall, J. dissenting).

Transtex makes aerodynamic trailer skirts, which improve fuel efficiency by reducing air drag. Transtex sued WABCO in the US District Court for the Eastern District of Michigan, alleging that WABCO’s trailer skirts infringed several Transtex patents. WABCO responded by filing two inter partes review (IPR) petitions, one of which was against a patent with claims directed to “resilient” trailer skirts and the “resilient” struts used to attach them to a trailer.

WABCO argued that the challenged claims of the patent were obvious over a combination of the Layfield and Rinard references. WABCO submitted expert declarations stating that a person of ordinary skill in the art would have recognized that Layfield’s rigid struts could benefit from being constructed of resilient, more flexible material. Accordingly, a skilled artisan would have been motivated to look to other, similar types of trailer components that are also flexible—like that disclosed in Rinard—to improve upon Layfield’s rigid struts. WABCO successfully relied on much of the same expert testimony to argue that a skilled artisan would also have enjoyed a reasonable expectation of success in combining the more rigid struts of Layfield with the compressible materials taught in Rinard because Rinard taught the utility of having compressible “air scoops” at the tail end of a trailer, which would compress downwards when the trailer contacted a loading dock.

The Board agreed with WABCO and found the challenged claims obvious. According to the Board, Layfield taught all of the claim limitations except for a “resilient strut” that could flex both toward the center of the trailer and away from the center of the trailer and then regain its shape while Rinard taught the benefits of using compressible air scoops made out of a resilient material as part of a trailer skirt system. The Board also concluded that a skilled artisan would have been motivated to combine Layfield with Rinard and would have had a reasonable expectation of success, given the predictable nature of the field. Transtex appealed.

The Federal Circuit affirmed, finding that substantial evidence in the form of expert testimony supported the Board’s finding that although Layfield taught a more rigid strut instead of a resilient strut as claimed, a skilled artisan would have been motivated to combine Layfield’s strut with the resilient materials disclosed in Rinard and would have enjoyed a reasonable expectation of success when doing so. The Court concluded that this was a case where the evidence of motivation to combine, which “everyone agrees meets the substantial evidence threshold,” significantly overlapped with the evidence relating to a reasonable expectation of success, so it was correct to conclude that a skilled artisan would have reasonably expected the resiliency benefit that motivated them to combine [...]

Continue Reading




read more

Things May Be Bigger in Texas, but Not Necessarily More Convenient

The US Court of Appeals for the Federal Circuit granted a mandamus petition after analyzing the Fifth Circuit’s public and private interest factors for transfer motions and ordered the US District Court for the Western District of Texas to transfer a case to the petitioner’s venue. In re Google LLC, Case No. 23-101 (Fed. Cir. Feb. 1, 2023) (Lourie, Taranto, Stark, JJ.).

Jawbone Innovations, LLC, had an eventful 2021:

  • February: Incorporated in Texas
  • May: Obtained ownership of nine patents (all directed to technologies behind the eponymous product line that liquidated in July 2017)
  • August: Rented office space in Waco, Texas
  • September: Asserted the nine patents it just acquired against Google in the Western District of Texas–Waco Division.

Google moved to transfer the dispute to the US District Court for the Northern District of California. That district was where (1) the accused products (earbuds, smartphones, speakers, displays and software) were researched, designed and developed; (2) the asserted technology was developed, and the asserted patents were prosecuted; and (3) the witnesses and sources of proof were primarily located. In contrast, no witnesses or sources of proof were located in the Western District of Texas. Moreover, Jawbone Innovations had no personnel in Waco nor activities related to the accused technology in the whole of Texas.

Judge Albright nevertheless denied Google’s transfer motion, weighing the Fifth Circuit’s four public interest factors and four private interest factors and finding that the transferee venue failed to meet the Fifth Circuit’s “clearly more convenient” standard. With the district court finding half of the eight factors not favoring either the transferee or the transferor, its holding boiled down to a ruling that considerations of “court congestion” and “judicial economy” (found to favor the transferor) outweighed considerations of “unwilling witness compulsion” and the “cost of attendance for willing witnesses” (found to favor the transferee).

Google petitioned the Federal Circuit for a writ of mandamus. The Court, applying the Fifth Circuit’s eight factor test, identified clear error in the district court’s analysis of five of the factors.

First: Addressing the “cost of attendance for willing witnesses” factor, the Federal Circuit found error in the district court’s conclusion that this factor only slightly favored transfer. Rather, the Court explained that this factor “weigh[ed] heavily in favor of transfer” because the transferee venue was clearly more convenient for potential witnesses, especially Google employees with technical, marketing and financial knowledge of the accused products. The error was localized to how the district court considered a Google declaration identifying at least 11 potential employee witnesses (all of whom were located in the transferee venue) and Jawbone Innovations’ assertions that the declaration omitted three potentially relevant Texas-based employees. The Court noted that while this 11 to three imbalance alone was sufficient to settle this factor, the district court’s error went further, finding Google’s declaration unreliable and less worthy of consideration because of the alleged omissions. The Federal Circuit determined this was error on error because the district court improperly ignored that the depositions [...]

Continue Reading




read more

KSR Does Not Extend to Design Patents (Yet)

Addressing the standard for obviousness of design patents, the US Court of Appeals for the Federal Circuit, in a per curiam opinion, upheld the Patent Trial & Appeal Board’s finding that a challenged design patent was not obvious over the pre-KSR design patent obviousness test or anticipated. LKQ Corporation v. GM Global Technology Operations, Case No. 21-2348 (Fed. Cir. Jan. 20, 2023) (per curiam) (Lourie, J., concurring) (Stark, J., concurring).

GM owns a design patent for the fender of a vehicle. LKQ Corp. previously held a license to the patent from GM, but negotiations to renew the license failed. Because LKQ continued to manufacture the fender after the expiration of the license, GM sent LKQ notice that it was infringing the patent. In response, LKQ petitioned for an inter partes review against GM, alleging that the patent was obvious and/or anticipated.

The Board found that LKQ had not presented enough evidence to prove that the patent was obvious or anticipated. For purposes of evaluating the obviousness of the design over prior art, the Board defined ordinary observers as “retail consumers who purchase replacement fenders and commercial replacement part buyers.” The Board concluded that, from the perspective of the ordinary observer, there were multiple differences between the patented design and the key reference, a prior art design patent. LKQ appealed.

LKQ argued that the Board erred in finding that there was no anticipation and in applying the obviousness tests of In re Rosen (C.C.P.A. 1982) and Durling v. Spectrum Furniture (Fed. Cir. 1996) because the Supreme Court of the United States overruled those tests in KSR International v. Telflex (2007).

The Federal Circuit upheld the Board’s definition of the ordinary observer. The Court found that retail purchasers of the entire vehicle would not be included in the ordinary observer group because purchasers of the product embodying the design are interested in the part itself, not the vehicle as a whole. The Court went on to uphold the Board’s application of the ordinary observer obviousness test, agreeing that the patented design created different overall impressions from the prior art for purposes of both obviousness and anticipation.

The Federal Circuit then addressed whether KSR overruled the Durling and Rosen tests for obviousness of design patents. The Court found that LKQ properly preserved the argument for appeal by asserting it in its opening brief to the Board. The Court then found that it was unclear whether the Supreme Court overruled Durling and Rosen, and therefore the Court was bound to apply the existing law. In applying the Durling and Rosen tests, the Court found that LKQ had failed to identify “the correct visual impression created by the patented design as a whole” because the prior art patent lacked certain key design features of the patented design. Thus, the Court affirmed the Board’s finding that the patent was not obvious.

Judge Lourie provided an additional opinion and addressed LKQ’s argument that KSR overruled Rosen. Lourie stated that because KSR did not involve design patents, which [...]

Continue Reading




read more

Bursting the Bubble on Prosecution Delays

Addressing a case where a patent owner filed hundreds of applications as part of a strategy to maintain extraordinarily lengthy patent coverage, the US Court of Appeals for the Federal Circuit affirmed a district court’s determination that the patent owner had engaged in a calculated and unreasonable scheme to delay patent issuance. Personalized Media Comms., LLC v. Apple Inc., Case No. 21-2275 (Fed. Cir. Jan. 7, 2023) (Reyna, Chen, JJ.) (Stark, J., dissenting).

The Uruguay Round Agreements Act and General Agreement on Tariff and Trade (GATT) amended the US patent term to 20 years from the effective filing date, instead of 17 years from the issue date. GATT took effect on June 8, 1995. In the months leading up to GATT’s enactment, some would-be patentees seeded patent applications with tremendous disclosures to anchor future applications and obtain the longer pre-GATT term. Practitioners referred to this time period as the GATT bubble. Personalized Media Communications (PMC) submitted 328 GATT bubble applications, from which PMC sought somewhere between 6,000 and 20,000 patent claims. The term of these patents would be 17 years from their issue date instead of 20 years from their priority date.

PMC asserted that Apple’s FairPlay digital rights management software infringed a patent covering a decryption method and won a jury verdict of $330 million. After the verdict, the district court held a bench trial and ultimately found that the patent was unenforceable because of prosecution laches, a doctrine that bars the assertion of patents where the patentee caused unreasonable delay in obtaining the patent, to the detriment of the accused infringer. PMC appealed.

The Federal Circuit affirmed. First, it examined whether the district court had properly concluded that PMC unreasonably delayed. Based on a wide swath of record evidence, all three panel members—Judges Reyna, Chen and Stark—agreed that, like the patentee in Hyatt v. Hirschfeld, PMC had engaged in an intentional scheme to delay patent issuance and extend its monopoly. PMC tried to distinguish its case from Hyatt by arguing that it had developed, with the US Patent & Trademark Office, a consolidation procedure to prioritize review of certain applications. The Court concluded that the structure of the agreement still unreasonably drew out resolution of PMC’s applications, however. The Court also approved of the district court’s reasoning based on the number of applications filed and the introduction of new (albeit narrowing) elements to the claims 16 years after the priority date.

Turning to prejudice, the Federal Circuit concluded that the district court did not act improperly in determining that the delay and improper conduct continued to harm Apple up through the filing of suit in 2015. The Court found that the patent had issued based on a pending claim that PMC did not disclose during PMC-Apple license negotiations and which PMC could quickly get granted and assert against Apple.

Judge Stark dissented, stating that he would conclude that the prejudice Apple faced did not happen during the period in which PMC unreasonably delayed issuance. Judge [...]

Continue Reading




read more

That Stings: Consent to Jurisdiction Must Be Effective at Filing to Invoke Fed. R. Civ. P. 4(k)(2)

The US Court of Appeals for the Federal Circuit, on petition for writ of mandamus, vacated the district court’s transfer order and remanded the transfer to be considered under the clarified parameters of Fed. R. Civ. P. 4(k)(2) and 28 U.S.C. § 1404. In re: Stingray IP Solutions, LLC, Case No. 2023-102 (Fed. Cir. Jan. 9, 2023) (Lourie, Taranto, Stark, JJ.)

Stingray filed patent infringement suits in the US District Court for the Eastern District of Texas against TP-Link, a company headquartered and organized in China. TP-Link moved to transfer to the Central District of California (CDCA) under 28 U.S.C. § 1406 citing an alleged lack of personal jurisdiction that Rule 4(k)(2) did not cure because TP-Link would be amenable to suit in the CDCA. TP-Link also moved for transfer under 28 U.S.C. § 1404(a). The district court granted the motion to transfer under § 1406 based on the rationale that TP-Link was amenable to suit in the CDCA and relying on affirmative reservations made by TP-Link that the CDCA had proper jurisdiction and venue. The district court denied TP-Link’s § 1404(a) motion as moot following the transfer. Stingray filed a mandamus petition asking the Federal Circuit to determine whether TP-Link’s unilateral, post-suit consent to personal jurisdiction in another state defeated application of Rule (4)(k)(2).

The Federal Circuit first determined that mandamus review was appropriate in this case in order to resolve the question of whether a defendant can defeat personal jurisdiction under Rule 4(k)(2) by unilaterally consenting to suit in a different district, a jurisdictional question that has divided district courts. Some district courts have held that personal jurisdiction cannot be established under Rule 4(k)(2) if a defendant states that it is amenable to suit in another state, while others have concluded that defendants must do more than simply designate an alternative forum in order to avoid application of Rule 4(k)(2).

Rule 4(k)(2) was originally introduced to close a loophole where non-resident defendants without minimum contact with any individual state suitable to support jurisdiction, but with sufficient contacts with the United States as a whole, were able to escape jurisdiction in all 50 states. The rule essentially provided that under federal claims, serving a summons or filing a waiver of service could establish personal jurisdiction if the defendant was not subject to a state’s general jurisdiction and exercising jurisdiction would be consistent with the US Constitution and laws.

Here, the case focused on the “negation requirement” of Rule 4(k)(2) where the defendant is not subject to any jurisdiction of a state court. This case addressed the question of whether a defendant’s post-suit, unilateral consent to suit in another state prevents the requirement that a defendant is not subject to a state’s general jurisdiction from being satisfied.

The Federal Circuit determined that the “negation requirement” requires defendants to identify a forum where jurisdiction would have been proper at the time of filing, regardless of consent. The Court determined that therefore a defendant cannot use a “unilateral statement of consent” to [...]

Continue Reading




read more

Absent Expressed Rationale of Obviousness, Federal Circuit Calls for Do-Over

The US Court of Appeals for the Federal Circuit reversed a ruling by the Patent Trial & Appeal Board (Board) where, on appeal, the US Patent & Trademark Office’s (PTO) rationale for sustaining the Board’s obviousness rejection did not reflect “the reasoning or findings the Board actually invoked.” In Re Google, LLC, Case No. 22-1012 (Fed. Cir. Jan. 9, 2023) (Moore, C.J., Lourie, Prost, JJ.)

Google’s patent application covers a method of filtering search results to display age-appropriate results using a “content rating score” in combination with a predetermined threshold value to determine which results will be presented. The application discloses several ways that the threshold value can be calculated, including using the length of the search query as a proxy for the age of the user, with longer queries being associated with older users and leading to a lower threshold score (allowing more mature content to be shown).

The application received a final rejection from the examiner, who asserted that the claims would have been obvious under 35 U.S.C. § 103 based on two prior art references, Parthasarathy and Rose. Parthasarathy disclosed a method to determine a content score to use for ranking results, while Rose disclosed a method to assign result importance based on query length. The examiner argued that it would be obvious to combine Rose and Parthasarathy to achieve the claimed method that recited a “predetermined threshold value” based on the number of words in a query. The examiner acknowledged that Parthasarathy did not disclose a threshold based on a number of words but found that Rose did, citing Rose’s modified relevance-ranking algorithm. He reasoned that it would have been obvious to combine Rose and Parthasarathy to achieve the claimed threshold because “analyzing a query for determining the query length and using the query length as a threshold is very well known in the art and doing so would further provide for assigning weight to a long or a short query for retrieving documents.” Google appealed the examiner’s decision to the Board, which affirmed the examiner’s rejection and adopted the examiner’s findings. Google appealed to the Federal Circuit.

On appeal, the PTO argued that because there were only two ways a person of ordinary skill in the art could modify Parthasarathy’s threshold to incorporate Rose, either of the modifications would have been obvious. However, the Federal Circuit found that this argument was not supported by the Board’s decision. The Court explained that while the Board did conclude that modifying Parthasarathy’s threshold to take into account the length of the query would have been obvious, the Board did not provide any detail as to how that would be achieved. In the absence of specific fact-based findings by the Board, the Court explained that it could not adopt the PTO’s argument, which rested on facts not found in the Board’s decision. A ruling relying on these facts would have resulted in a violation of basic administrative law principles since a court may only uphold an agency action on [...]

Continue Reading




read more

Dictionaries Don’t Know Best: The Intrinsic Record Prevails (Again)

The US Court of Appeals for the Federal Circuit addressed the tension between the intrinsic and extrinsic record in claim construction, holding that the intrinsic record should be relied on first. The Court therefore reversed a district court finding of indefiniteness based on dictionary definitions and expert testimony. Grace Instrument Industries, LLC v. Chandler Instruments Company, LLC, Case Nos. 21-2370; -2370 (Fed. Cir. Jan. 12, 2023) (Chen, Cunningham, Stark, JJ.)

Grace owns a patent for a liquid pressurized viscometer used commonly to test the viscosity of drilling fluid that is used to drill oil wells. Grace’s viscometer uses an “enlarged chamber” between a lower chamber and a pressurization fluid inlet. According to the patent specification, this enlarged chamber was designed to reduce the measurement error in prior viscometer models that was caused by the mixing of sample fluid and pressurization fluid or by friction emanating from a seal in the viscometer. Within the lower chamber of the patented viscometer, there is a rotor having a “means for driving said rotor to rotate.”

Grace sued Chandler, claiming that Chandler infringed Grace’s viscometer patent. During claim construction, the district court found that the term “enlarged chamber” was indefinite, and that because it was a “term of degree,” it must be compared against something objective. The district court entered its final judgment in favor of Chandler. Grace appealed.

The Federal Circuit reversed, explaining that the “enlarged chamber[’s]” size did not need to be compared against any baseline object, but rather needed to be “large enough to accomplish a particular function.” The Court relied on the specification, which explained that the viscometer described in the patent reduced the mixing of sample fluid and pressurization fluid that was common in older viscometer models by using an “enlarged chamber.” The Court also cited the prosecution history, where the applicant explained that the invention solved a “long lasting problem” by reducing the measurement error caused by the friction of the seal or mixing of the fluids in older viscometer designs. Thus, the Court reasoned that a person of ordinary skill in the art would understand that the “enlarged chamber” must be large enough to prevent the mixing of the pressurization fluid and sample fluid to avoid the measurement errors associated with prior art viscometers.

Chandler argued that the term “enlarged chamber” was not a term of art. The Federal Circuit agreed but explained that “the intrinsic record sufficiently guides a skilled artisan as to the meaning of the term” as used in the patent. The Federal Circuit found that the district court erred in relying on a dictionary definition (extrinsic evidence) to contradict the meaning of the term found within the intrinsic record. The specification’s instructions for the meaning of a claim term should prevail over extrinsic evidence. Rebuffing Chandler’s argument, the Court explained that the specification does not need to explicitly define the claim term to govern the interpretation of that term.

The Federal Circuit remanded the case to the district court to reconsider indefiniteness in [...]

Continue Reading




read more

STAY CONNECTED

TOPICS

ARCHIVES