prior art Archives

prior art

Plausible Alternative Understanding of Prior Art? So What?

by Connor M. Larson | Dec 12, 2024 | Patents

Affirming the Patent Trial & Appeal Board’s final determination that three claims were invalid for obviousness, the US Court of Appeals for the Federal Circuit ruled that a “plausible alternative understanding” of the prior art did not compel a reversal under the substantial evidence review standard. Koninklijke KPN N.V. v. Vidal, Case No. 19-2447 (Fed. Cir. Dec. 2, 2024) (Prost, Reyna, Chen, JJ.)

Three computer networking companies filed a petition for inter partes review (IPR) to challenge the patentability of claims of a patent for regulating access to a telecommunications network owned by Koninklijke. The challenged claims included limitations concerning devices, identified by a controller with a unique identifier, that requested access to a network. The controller allowed each device network access based on a “grant access time interval.” The petitioners argued that the challenged claims were unpatentable as obvious in view of three prior art references: Obhan, Shatzkamer, and Budka.

After considering the parties’ argument over what was disclosed by the references, the Board found that Obhan disclosed an admission control system for a wireless network that included assigning devices a “good till time.” The Board found that Shatzkamer disclosed managing a wireless network using a system to identify specific devices, add those devices to a “blacklist,” and deny network access to the blacklisted devices. The Board determined that the combination of Obhan, Shatzkamer, and Budka taught the limitations of the challenged claims. Koninklijke appealed.

Koninklijke argued that the Board erred in its determination that the prior art references taught certain claim limitations and provided motivation to combine the references.

Koninklijke first argued that substantial evidence did not support the Board’s finding that Obhan disclosed the access request limitations of the challenged claims. Koninklijke also argued that Obhan did not teach consulting a “good till time” to determine whether to allow a device to access the network. The Federal Circuit disagreed, finding that Koninklijke’s argument merely presented “a plausible alternative understanding of Obhan.” The Court explained that under the substantial evidence standard of review, this was not enough to conclude that the Board’s decision was unsupported by substantial evidence. The Court declined to reweigh the evidence or make factual findings of its own.

Second, Koninklijke argued that the Board’s determination was not supported by substantial evidence because the Board misread and misstated one of the challenged claims. An exemplary claim of the challenged patents recited “an access operation to deny access for the terminal if the access request is received within the time period,” whereas another recited “denying the terminal access to the telecommunications network responsive to the access request being received within the time period defined by the accessed identification of at least one associated deny access time interval.” In its decision, the Board stated that second claim “requires only that the access request be denied if it is received within the time period during which access is denied.” Koninklijke faulted the Board for using the term “if” instead of “responsive to.”

The Federal Circuit did not find [...]

Continue Reading

Private Sale Means Public Fail

by Keval Amin | Aug 8, 2024 | America Invents Act, Patents

The US Court of Appeals for the Federal Circuit affirmed a Patent Trial & Appeal Board decision that a private sale of a product embodying the claimed invention did not qualify as a “public disclosure” under 35 U.S.C. § 102(b)(2)(B). Sanho Corp. v. Kaijet Technology Int’l Ltd, Inc., Case No. 23-1336 (Fed. Cir. July 31, 2024) (Dyk, Clevenger, Stoll, JJ.)

Sanho owns a patent directed to a port extension apparatus designed to enhance connectivity of end-user devices (such as laptops) with other devices (such as printers). Kaijet petitioned for inter partes review (IPR) challenging certain claims of Sanho’s patent, arguing that the claims were obvious based on a prior art reference. The Board found that the patent claims were invalid because of the prior art reference’s earlier effective filing date. Sanho argued that a prior sale of its HyperDrive device by the inventor of the patent should disqualify the reference as prior art. However, the Board determined that Sanho failed to demonstrate a public disclosure of the HyperDrive sale before the prior art reference’s effective filing date. Thus, the patent was invalidated. Sanho appealed.

The Federal Circuit affirmed, explaining that the America Invents Act (AIA) redefined prior art, shifting from a first-to-invent to a first-inventor-to-file system. Under the AIA, prior art includes patents and applications filed before the patent’s effective filing date subject to exceptions for public disclosures by the inventor. Sanho argued that the HyperDrive sale fell into this exception.

The Federal Circuit dismissed Sanho’s argument that the phrase “publicly disclosed” in § 102(b)(2)(B) should encompass all types of disclosures described in § 102(a)(1), including private sales. The crux of the issue was whether placing an invention “on sale” was tantamount to a “public disclosure” under § 102(b)(2)(B). The statute states that a disclosure is not prior art if the subject matter was publicly disclosed by the inventor before the effective filing date of the prior art. Sanho argued that “publicly disclosed” includes any disclosure, even private sales. The Court disagreed, explaining that the statute’s use of “publicly” implies a narrower scope than just “disclosed.” The Court noted that the purpose of this exception is to protect inventors who make their inventions available to the public before another’s patent filing.

The Federal Circuit also relied on legislative history in support of the conclusion that “public disclosure” in § 102(b)(2)(B) means the invention must be made available to the public. Sanho argued that as long as there are no confidentiality requirements, all disclosures, even private sales, should constitute public disclosures. Again, the Court rejected that argument, noting that the statute differentiates between “publicly disclosed” and general “disclosures,” implying different meanings.

The Federal Circuit determined that § 102(b)(2)(B) protects inventors who publicly disclose their inventions from subsequent disclosures by others, ensuring that prior public disclosure by the inventor prevents a third party’s disclosure from becoming prior art. This provision aims to encourage inventors to share their innovations with the public.

Practice Note: For a disclosure to qualify as “public” under the [...]

Continue Reading

PTAB MTA Pilot Program to the Rescue

by Thomas DaMario | Aug 1, 2024 | Patents

On review of a final written decision from the Patent Trial & Appeal Board in an inter partes review (IPR), the US Court of Appeals for the Federal Circuit found that all challenged claims were obvious but left open the possibility of the patent owner amending the claims under the Motion to Amend (MTA) Pilot Program. ZyXEL Communications Corp. v. UNM Rainforest Innovations, Case Nos. 22-2220; -2250 (Fed. Cir. July 22, 2024) (Dyk, Prost, Stark, JJ.)

ZyXEL Communications petitioned for IPR challenging claims 1 – 4, 6, 7 and 8 of a patent owned by UNM Rainforest Innovation (UNMRI). The patent relates to methods for constructing frame structures in communication systems using orthogonal frequency-division multiple access (OFDMA) technologies. The patent describes a method for constructing a frame structure with two sections, each of which is configured for a different communication system, where the second communication system is used to support high mobility users (i.e., faster moving users).

Before the Board, ZyXEL argued that claims 1 – 4, 6 and 7 were unpatentable in light of two prior art references (Talukdar and Li), and that claim 8 was unpatentable in light of Talukdar and another prior art reference (Nystrom). During the Board proceedings, UNMRI filed a contingent motion to amend if any of the challenged claims were found to be unpatentable. As part of its motion, UNMRI requested preliminary guidance from the Board pursuant to the Board’s MTA Pilot Program. In its opposition to UNMRI’s motion to amend, ZyXEL argued that UNMRI’s amended claims lacked written description support, and in its preliminary guidance, the Board agreed. UNMRI attempted to file a revised motion to amend, but the Board rejected the revised motion and instead permitted UNMRI to file a reply in support of its original motion. It also allowed ZyXEL to file a sur-reply. The Board determined that claims 1 – 4, 6 and 7 were unpatentable, but that claim 8 was not. The Board also granted UNMRI’s motion to amend and determined that the new claims were nonobvious over the prior art of record. Both sides appealed.

With respect to the Board’s decision on the obviousness of claims 1 – 4, 6 and 7, the Federal Circuit found that substantial evidence supported the ruling. UNMRI’s primary argument was that a person of skill in the art (POSA) would not have been motivated to combine Talukdar and Li, but the Court credited the Board’s reliance on ZyXEL’s expert, who demonstrated sufficient motivation to combine the two references.

The Federal Circuit reversed the Board’s finding that claim 8 had not been shown to be obvious, however. The Court noted that while the Nystrom reference may not explicitly state the benefit of the missing limitations, “a prior art reference does not need to explicitly articulate or express why its teachings are beneficial so long as its teachings are beneficial and a POSA would recognize that their application was beneficial.”

Regarding UNMRI’s motion to amend, ZyXEL argued that the Board erred in granting the [...]

Continue Reading

Drawing Can Teach Claim Limitations If “Clear on Its Face”

by Connor M. Larson | Apr 18, 2024 | Patents

Addressing when a drawing in a prior art reference includes a teaching that is “clear on its face,” the Director of the US Patent & Trademark Office vacated and remanded a Patent Trial & Appeal Board decision denying institution of an inter partes review (IPR) petition. MAHLE Behr Charleston Inc. v. Catalano, IPR2023-00861 (PTAB Decision Review, Apr. 5, 2024) (Vidal, PTO Dir.)

MAHLE Behr filed a petition requesting institution of an IPR, challenging claims of a patent owned by Catalano. The patent is directed to a device known as a sacrificial anode that prevents corrosion in motor vehicle radiators caused by electrolysis. One of the claim terms at issue requires the anode to be “within 10 inches” of another element. MAHLE argued that a figure in a prior art reference anticipated or rendered obvious several challenged claims.

The Board denied the institution after determining that MAHLE did not establish a reasonable likelihood that it would prevail with respect to at least one of the challenged claims. The Board cited the Federal Circuit’s 2000 decision in Hockerson-Halberstadt v. Avia Group International to explain that “[p]atent drawings do not define the precise proportions of the elements and may not be relied on to show particular sizes if the specification is completely silent on the issue.” The Board concluded that the figure relied on by MAHLE did not provide exact dimensions and thus could not be sufficient to render the claims invalid.

MAHLE filed a request for Director Review, which was granted. In its request, MAHLE argued that the Board erred in its application of Federal Circuit case law on the use of patent drawings as prior art teachings. The Director agreed, explaining that “the Board did not adequately address [MAHLE’s] arguments regarding what [the figure in the prior art] clearly shows or would have reasonably suggested to a person of ordinary skill in the art.” Federal Circuit case law established that a claim may be anticipated or rendered obvious by a figure in the prior art if the drawing clearly discloses the claim limitation. If “a person of skill in the art could derive the claimed dimensions from the patent’s disclosure, there is no additional requirement that the specification must explicitly disclose the precise proportions or particular sizes.”

The Director further explained that “the Board did not adequately address MAHLE’s arguments regarding what [the prior art figure] clearly shows or would have reasonably suggested to a person of ordinary skill in the art.” While the prior art figure did not disclose the precise proportions or measured quantity specified in the challenged claims, the figure showed the elements being located as claimed (necessarily within the 10 inches recited). The Director explained that the Board should have considered whether a person of ordinary skill in the art would have understood the figure to disclose the claimed elements being within 10 inches of each other.

The Director vacated the Board’s decision and remanded the petition with instructions to consider both what the prior art figure [...]

Continue Reading

Is Evidence of All Claimed Elements in Prior Art Enough? Not Without Motivation to Combine

by Sydney E. McDermott | Apr 4, 2024 | Patents

The US Court of Appeals for the Federal Circuit reversed a Patent Trial & Appeal Board obviousness decision, finding that disclosure in the prior art of all recited claim elements across multiple references, without more, does not establish obviousness unless there is evidence of a motivation to combine. Virtek Vision Int’l ULC v. Assembly Guidance Systems, Inc., Case No. 22-1998 (Fed. Cir. Mar. 27, 2024) (Moore, C.J.; Hughes, Stark, JJ.)

Virtek holds a patent that discloses “an improved method for aligning a laser projector with respect to a work surface.” Lasers are used to “project a template image onto a work surface to direct manufacturing processes.” The patent discloses a two-step process that improves efficiency over the prior art.

Aligned Vision petitioned for inter partes review (IPR), challenging all of the patent’s claims. Aligned Vision asserted four combinations of prior art references over which it contended the claims were obvious. In its Final Written Decision, the Board found that some of the claims were unpatentable as obvious, but others were not.

The Board determined that certain claims, which depended from the independent claim, would have been obvious over two combinations of references: Keitler and Briggs, and Briggs and Bridges. In pertinent part, the independent claim recites “identifying a pattern of the reflective targets on the work surface in a three dimensional coordinate system.” Save for the 3D claim element, all the other claim elements were disclosed in Bridges and Keitler. The Board found that a skilled artisan would have been motivated to use the 3D coordinate system disclosed in Briggs instead of the angular direction systems in Keitler or Bridges. The Board reasoned that this combination would have been obvious to try because Briggs disclosed both 3D coordinates and angular directions.

With respect to the direct appeal, the Federal Circuit found that the Board erred as a matter of law regarding motivation to combine. “It does not suffice to meet the motivation to combine requirement to recognize that two alternative arrangements such as an angular direction system using a single camera and a 3D coordinate system using two cameras were both known in the art.” Rather, the patent challenger must show that a skilled artisan would swap the element in one reference for an element in another reference. “The mere fact that these possible arrangements existed in the prior art does not provide a reason that a skilled artisan would have substituted the one-camera angular direction system in Keitler and Bridges with the two-camera 3D coordinate system disclosed in Briggs.”

Here, the patent challenger presented no argument in the IPR petition regarding why a skilled artisan would make this substitution, other than that the two different coordinate systems were “known to be used.” Specifically, Briggs made no mention of any benefits the 3D system might provide over the angular system. Aligned Vision’s expert testified multiple times that he could not provide a reason to combine the references, and Aligned Vision presented no evidence that “there are a finite number of [...]

Continue Reading

Optimizing Obviousness: Routine Optimization Can Fill in Prior Art Gaps

by Alexander Piala, PhD | Mar 14, 2024 | Life Sciences, Patents

In an appeal from a Patent Trial & Appeal Board finding of invalidity, the US Court of Appeals for the Federal Circuit held that the result-effective variable doctrine can apply even when there is no overlap between a claimed range and a prior art range. The Court also held that before denying a motion to amend, the Board must address every element of proposed claims, and that a party cannot challenge the US Patent & Trademark Office (PTO) Director Review procedure if it cannot show prejudice. Pfizer Inc. v. Sanofi Pasteur, Inc., Case No. 19-1871 (Fed. Cir. Mar. 5, 2024), (Lourie, Bryson, Stark, JJ.)

Sanofi filed five inter partes review (IPR) petitions targeting a patent owned by Pfizer and directed to immunogenic glycoconjugates of Streptococcus antigens (i.e., combinations of sugar molecules found on the surface of Streptococcus bacteria capable of provoking an immune response). The challenged independent claim recited conjugates having a sugar from the 22F Streptococcus serotype and a molecular weight falling within a claimed range. Dependent claims further limited the independent claim by requiring combinations of specific sugars.

Sanofi challenged the claims based on a combination of two references: GSK-711 and Merck-086. GSK-711 described vaccines using sugars from 22F, and Merck-086 described immunogenic compositions using Streptococcus sugar conjugates. While neither reference disclosed the molecular weight of a 22F conjugate, the Board found that the molecular weight of a conjugate was a “result-effective variable” – i.e., a variable that affected the efficacy of the result – and thus it would have been obvious for a person of ordinary skill in the art (POSITA) to optimize the molecular weight of a 22F-based conjugate to achieve the claimed molecular weight range. The Board also found that the dependent claims would have been obvious, as GSK-711 disclosed the additionally claimed sugars. Pfizer filed a motion to amend to add new claims, but the Board denied the motion. Pfizer also requested Director Review of the Board’s decision, but the Director denied the request.

Pfizer appealed to the Federal Circuit alleging that the Board improperly applied the result-effective variable doctrine, that the Board improperly denied Pfizer’s request to amend the claims, and that the Director’s denial of review violated the Administrative Procedure Act (APA). The Federal Circuit affirmed the Board’s finding of invalidity, affirmed in part and remanded in part the issue of the proposed claim amendment, and finally held that any violation of the APA was harmless.

The Federal Circuit started with an analysis of the result-effective variable doctrine. Pfizer argued that the result-effective variable doctrine could not apply when there was no disclosure of an effective range in the prior art. Therefore, because neither GSK-711 nor Merck-086 disclosed an effective molecular weight range for a 22F conjugate, and because the relationship between molecular weight and efficacy was unpredictable, the independent claim was not obvious. The Court disagreed.

The Federal Circuit explained that, when there is a gap between the prior art and the claims, the relevant [...]

Continue Reading

Sliced and Diced: Operating Manuals Are Printed Publications

by Keval Amin | Feb 15, 2024 | Patents

The US Court of Appeals for the Federal Circuit reversed the Patent Trial & Appeal Board’s non-obviousness determination, finding that the Board erred in determining that an operating manual did not qualify as printed publication prior art. Weber, Inc. v. Provisur Technologies, Inc., Case Nos. 22-1751; -1813 (Fed. Cir. Feb. 8, 2024) (Reyna, Hughes, Stark, JJ.)

Provisur owns two patents related to advanced high-speed mechanical slicers used in food processing facilities that precisely slice and package food items such as meats and cheeses. The key components recited in the patent claims are a “loading apparatus” designed to load food items, a “feeding apparatus” responsible for supplying food items to a slicer, and a “stop gate” intended to regulate the assembly of food items prior to their entry into the slicing mechanism.

Weber filed inter partes review (IPR) petitions challenging the validity of several claims of the patents based on certain operating manuals. During the IPR proceedings, the Board determined that Weber’s operating manuals did not qualify as prior art printed publications because they were distributed selectively and subject to confidentiality restrictions. The Board also concluded that the prior art combinations, which included Weber, failed to disclose crucial claim limitations, notably the “disposed over” and “stop gate” limitations. The Board found the challenged claims not unpatentable. Weber appealed.

Weber argued that the Board erred in determining that the operating manuals were insufficiently accessible to constitute printed publications, specifically contending that the Board misapplied the Federal Circuit’s 2009 decision in Cordis Corp. v. Boston Scientific Corp. The Court agreed. It explained that unlike Cordis, where academic monographs were limited to distribution among a select few, Weber’s operating manuals were intended for distribution to purchasers of the machines and others to provide instructions on food slicer usage and maintenance. The Court explained that the evidence in the form of delivery records and email exchanges showed that manuals were available to customers upon purchase or request. The Federal Circuit also noted that the manuals were not bound by any confidentiality restrictions. The Court thus concluded that the operating manuals qualified as printed publications.

Turning to claim construction, the Federal Circuit reversed the Board’s interpretation of the “disposed over” and “stop gate” limitations. Consistent with long-standing precedent, the Court emphasized the importance of examining intrinsic evidence, including the claims themselves, the specification and the patent’s prosecution history. Weber argued that the claims’ language implied a broader feed apparatus positioning over the loading apparatus without strict alignment requirements. Supported by expert opinions, Weber contended that neither the claim language nor the specification mandated direct alignment. The Court agreed with Weber. The Court emphasized that “disposed over” demanded only a general positioning of the feed apparatus above the loading apparatus, not a direct positioning as the Board had construed.

Similarly, concerning the “stop gate” limitation, the Federal Circuit agreed that the Board’s determination was not supported by substantial evidence because evidence, such as the manuals, disclosed the claimed conveyer mechanism in a manner sufficient to establish its [...]

Continue Reading

Even a Non-Explicit Claim Construction Can Be Erroneous

by Brennen Baylor | Feb 15, 2024 | Patents

The US Court of Appeals for the Federal Circuit reversed a Patent Trial & Appeal Board decision finding the challenged patent claims not obvious over the prior art. The Court found that the Board, after concluding that no claim construction was required, implicitly construed the claim limitation at issue and did so erroneously. Google LLC v. EcoFactor, Case Nos. 22-1750; -1767 (Fed. Cir. Feb. 7, 2024) (Reyna, Taranto, Stark, JJ.)

Google filed a petition for inter partes review (IPR) challenging claims of an EcoFactor patent related to dynamic climate control systems that factor outside weather conditions and thermal conditions inside the home to balance comfort and energy savings. The challenged claims define a method for reducing the cycling time of a climate control system involving “retrieving a target time at which [the] structure [(e.g., a house)] is desired to reach a target temperature.” The challenged method claims recite a step of “determining a first time prior to said target time at which [the] climate control system should turn on to reach the target temperature by the target time.” The relevant claim limitation reads:

[D]etermining a first time prior to said target time at which said climate control system should turn on to reach the target temperature by the target time based at least in part on [i] said one or more thermal performance values of said structure, [ii] said performance characteristic of said climate control system, [iii] said first internal temperature, [iv] said first external temperature, and [v] the forecasted temperature.

During the IPR proceedings, the parties disputed whether a prior art reference disclosed a method involving determining a first time prior to the target time based on a first internal temperature. Google argued that the prior art taught a calculation of a first time prior to the target time based on thermal performance values (input [i]) calculated from internal temperature values (input [iii]). EcoFactor argued that each of the inputs in the claim limitation was a distinct value not dependent on or calculated from any other input. Based on the claim language, the Board determined that claim construction was unnecessary and concluded that inputs [i] – [v] of the relevant claim limitation were separate inputs using different data. The Board concluded that Google had not shown that the challenged claims were unpatentable, reasoning that Google’s theory of obviousness relied on a single input as the basis for both input [i] and input [iii].

Google appealed. Google argued that although the Board stated that no construction was necessary, it incorrectly construed the claim limitation to require five discrete inputs.

The Federal Circuit agreed with Google, finding that the Board’s assessment of the claim limitation implicitly established the claim scope by requiring inputs [i] – [v] to be completely separate. The Court reasoned that the plain claim language did not provide any indication that none of the listed inputs could be based on any other input(s). Imputing this requirement into the limitation was therefore an act of claim construction.

The Federal [...]

Continue Reading

Wave Goodbye: Arguments Incorporated by Reference Are Waived

by Benjamin Ediger, Ph.D. | Nov 30, 2023 | Patents

The US Court of Appeals for the Federal Circuit affirmed the Patent Trial & Appeal Board’s patentability determination, finding that the patent challenger waived an argument it attempted to incorporate by reference to another brief. Medtronic, Inc. v. Teleflex Life Scis. Ltd., Case No. 2022-1721 (Fed. Cir. Nov. 16, 2023) (Lourie, Prost, Chen, JJ.)

Teleflex owns a patent directed to a method for using a guide extension catheter with a guide catheter. Medtronic challenged the patent in two inter partes review (IPR) proceedings, arguing that certain claims were obvious in light of Ressemann and Itou and that another claim was obvious in light of Ressemann, Itou and Kataishi. Teleflex argued that Itou was not prior art because the claimed invention was conceived prior to Itou’s filing date and was either actually reduced to practice before the critical date or diligently pursued until its constructive reduction to practice date. Medtronic did not contest Teleflex’s demonstration of conception but instead challenged Teleflex’s alleged showings of both actual reduction to practice and diligence until constructive reduction to practice.

The Board ultimately found that Itou did not qualify as prior art and that Medtronic therefore had not shown that the challenged claims were unpatentable. One of the issues before the Board was whether in vivo testing was required for actual reduction to practice because the claims at issue were method claims reciting “advancing . . . a guide catheter . . . through a main blood vessel to an ostium of a coronary artery.” The Board ultimately found that no such testing was required, explaining that Medtronic “was unable to identify any legal precedent requiring in vivo performance of a claimed in vivo method to show actual reduction to practice.” According to the Board, actual reduction to practice could “be verified using a physical model that replicates the anatomy in which the method would likewise be performed in vivo.” Medtronic appealed.

Medtronic challenged the Board’s determination regarding constructive reduction to practice, arguing as follows:

In addressing diligence, the Board simply adopted its earlier erroneous diligence analysis in IPR2020-00132. Appx61–62. Therefore, if this Court vacates the Board’s diligence holding in No. 21-2356, it should likewise vacate the Board’s decision here. Appellant’s Br. at 41.

The Federal Circuit explained that it did not vacate the diligence holding in the prior decision, so Medtronic’s condition precedent had not been met. Medtronic nevertheless urged the Court to decide the diligence question. The Court refused, finding that Medtronic improperly incorporated by reference an argument from another brief. The Court explained that it would be fundamentally unfair to allow Medtronic to use incorporation by reference to exceed the word limit on briefs. The Court observed that parties pursuing appeals must make certain strategic decisions concerning what material to include in their opening briefs, and here, Medtronic affirmatively chose not to include developed arguments on diligence. The Court therefore found that Medtronic waived its challenge to the Board’s diligence finding. With the diligence issue waived and conception stipulated, the Court affirmed [...]

Continue Reading

No Need To Be Explicit: Implicit Finding of Expectation of Success Is Sufficient

by Katherine Pappas | Oct 5, 2023 | Patents

The US Court of Appeals for the Federal Circuit affirmed a Patent Trial & Appeal Board unpatentability decision, finding that a combination of prior art references only requires an implicit indication of a reasonable expectation of success. Elekta Ltd. v. Zap Surgical Systems, Case No. 21-1985 (Fed. Cir. Sept. 21, 2023) (Reyna, Stoll, Stark JJ.)

Elekta owns a patent directed to a “method and apparatus for treatment by ionizing radiation.” The claimed invention uses a radiation source such as a linear accelerator (linac) mounted on concentric rings to deliver a beam of ionizing radiation to a target area on the patient. Zap challenged the patent as obvious in an inter partes review (IPR) proceeding. In its Final Written Decision, the Board agreed, concluding that a skilled artisan would have been motivated to combine the asserted prior art references. Elekta appealed.

Elekta raised three arguments on appeal:

The Board’s findings on motivation to combine were not supported by substantial evidence.
The Board failed to make any findings (explicit or implicit) on a reasonable expectation of success.
Even if the Board made such findings, they were not supported by substantial evidence.

The Federal Circuit first considered the issue of motivation to combine the prior art references disclosing radiation imagery with references disclosing radiation therapy, noting that the obviousness determination does not always require the prior art to expressly state a motivation for every obviousness combination. Elekta had challenged the asserted combination based on a physical impracticality in combining the art due to the weight of the linac. The Board, however, disagreed largely because of the level of skill in the art in addition to its definition of the relevant field as one that “includes the engineering design of sturdy mechanical apparatuses capable of rotationally manipulating heavy devices.” The Court found that the Board’s finding of motivation to combine was supported by substantial evidence, including the prosecution history, the prior art teaching and the expert testimony of record.

The Federal Circuit next considered Elekta’s argument that the Board erred by failing to articulate findings on reasonable expectation of success. The Court explained that “an obviousness determination requires finding that a person of ordinary skill in the art would have had a reasonable expectation of success,” referring to “the likelihood of success in combining references to meet the limitations of the claimed invention.” The Court concluded, however, that unlike the motivation to combine determination, which must be an explicit analysis under KSR, a finding of reasonable expectation of success may be implicit. The Court acknowledged that this could be seen as being in tension with its review of Board determinations under the Administrative Procedure Act but concluded that “there is no such tension where the Board makes an implicit finding on reasonable expectation of success by considering and addressing other, intertwined arguments, including . . . those [regarding] a motivation to combine.”

Finally, the Federal Circuit addressed Elekta’s argument that, even if the Board made an implicit finding on reasonable expectation of [...]

Continue Reading

Older Posts »

BLOG EDITORS

Paul Devinsky

Amol Parikh

BLOG EDITORS

STAY CONNECTED

TOPICS

ARCHIVES

RECENT POSTS