burden of proof Archives

burden of proof

When “It’s Obvious” Just Isn’t Enough: Challenger’s Burden to Prove Obviousness

by Keval Amin | Mar 27, 2025 | Patents

The US Court of Appeals for the Federal Circuit affirmed the Patent Trial & Appeal Board’s decision that a patent was not obvious because the petitioner failed to show sufficient support of obviousness based on prior art. AMP Plus, Inc. v. DMF, Inc., Case No. 23-1997 (Fed. Cir. Mar. 19, 2025) (Lourie, Bryson, Reyna, JJ.)

DMF owns a patent directed to a compact recessed lighting system designed for installation in a standard electrical junction box. In 2019, AMP, doing business as ELCO, petitioned for inter partes review of several claims of the patent on three grounds of unpatentability:

Anticipation by a prior reference
Obviousness based on a combination of two references
Further obviousness based on an additional source.

The Board found that one claim was anticipated but ruled that ELCO failed to prove unpatentability of the other claims, including the claim at issue on appeal. The claim at issue describes a system with wires connected to a driver and a first connector, coupled to a second connector that in turn is connected to the building’s electrical system. This specific connection was referred to as “Limitation M.” ELCO appealed. In that earlier appeal (2022), the Federal Circuit affirmed the Board’s ruling on all claims except the claim at issue and remanded the case back to the Board for further analysis.

On remand, the Board concluded that ELCO failed to demonstrate the unpatentability of the claim at issue because ELCO’s petition lacked a substantive analysis of Limitation M. The Board found ELCO’s argument that a prior art marine lighting system could be adapted for the claimed building use unsupported by evidence and ruled that the claim at issue was not obvious. Again, ELCO appealed.

ELCO raised two main arguments. First, it argued that the Board erred in not determining that the claim at issue was anticipated by a prior reference, as the Board had previously found another claim to be anticipated by the same reference. The Federal Circuit rejected this argument because ELCO had only challenged the claim at issue on the basis of obviousness in its original petition, not anticipation. Since the issue of anticipation was not raised in the petition, the Court determined that ELCO could not introduce this new ground of unpatentability on appeal.

Second, ELCO argued that its petition had sufficiently demonstrated the obviousness of Limitation M based on the prior references. The Federal Circuit disagreed, finding that ELCO’s petition did not adequately address the specific requirement for coupling the system to a building’s electrical infrastructure. The petition failed to discuss how the recessed lighting system would be installed in a building, and the references cited did not provide adequate support for the argument of obviousness for this particular limitation.

The Federal Circuit emphasized that it was not the Board’s responsibility to supplement the petitioner’s arguments or search for evidence to support an inadequately supported claim challenge. The Court reiterated that an obviousness analysis does not require the Board to fill gaps in the petitioner’s original [...]

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Palette of Evidence: PTAB Must Consider Entire Record to Determine Prior Art Status

by Anisa Noorassa | Mar 20, 2025 | Patents

The US Court of Appeals for the Federal Circuit vacated and remanded a Patent Trial & Appeal Board patentability determination, finding that the Board failed to consider the entire record regarding the prior art status of a sample and did not explain why it did not do so. CQV Co., Ltd. v. Merck Patent GmbH., Case No. 23-1027 (Fed. Cir. Mar. 10, 2025) (Chen, Mayer, Cunningham, JJ.)

Merck owns a patent that covers alpha-alumina flakes included in paints, industrial coatings, automotive coatings, printing, inks, and cosmetic formulations to impart a pearlescent luster. CQV petitioned the Board for post-grant review (PGR) of the patent, arguing that the challenged claims were obvious in view of prior art samples of Xirallic®, a trademarked product produced by Merck. In its final written decision, the Board found that CQV had not adequately supported its contention that the alleged Xirallic® lot qualified as prior art and therefore had not shown by a preponderance of the evidence that the challenged claims were unpatentable. CQV appealed.

The Federal Circuit reviewed the Board’s finding under the substantial evidence standard. The Court found that the Board erred in failing to consider the entire record and did not provide any basis for that failure. In terms of the prior art status of the Xirallic® samples, the Court found that the Board failed to consider testimony regarding the availability of Xirallic® for customer order and the length of the quality control process. The Court could not “reasonably discern whether the Board followed a proper path” in determining that CQV failed to show by a preponderance of the evidence that the sample of Xirallic® constituted prior art. The Court remanded, suggesting that the Board carefully consider whether the sample of Xirallic® would have been publicly available as of the alleged critical dates.

Beach Buggy Battle: Stipulation Insufficient to Establish Trademark Distinctiveness

by Tim Dunker | Jan 30, 2025 | Trademarks

The US Court of Appeals for the Fourth Circuit found that a district court does not need to accept both parties’ stipulation that a mark is distinctive but instead is permitted to make an evidentiary inquiry in determining whether the mark is distinctive or generic. Moke America LLC v. Moke Int’l Ltd., Case No. 23-1634 (4th Cir. Jan. 15, 2025) (King, Groh, JJ.) (Richardson, J., dissenting).

Starting in the 1960s, British Motor Corporation (BMC) sold vehicles colloquially referred to as “Mokes” in the United Kingdom, Australia, and Portugal. By the time BMC ceased production in 1993, Mokes had garnered a small but devoted following for use as beach buggies in the United States, the Caribbean, and Australia.

In August 2015, Moke International and Moke USA sold their first vehicle using the MOKE mark and subsequently sought trademark registration. One year later, Moke America began US sales of vehicles using the MOKE mark. Both parties described their vehicles as being reengineered and redesigned versions of the BMC Moke.

The present dispute began when Moke America opposed Moke International and Moke USA’s registration based on priority use of the MOKE mark. The Trademark Trial & Appeal Board dismissed the opposition. Moke America then filed a district court complaint seeking a declaration of trademark ownership and asserting trademark infringement. Moke International and Moke USA counterclaimed for a declaration of trademark ownership and trademark infringement, as well as affirmance of the Board’s dismissal.

A party claiming ownership of a mark bears the burden of proving distinctiveness. A generic term is not distinctive. Generic terms in trademark law are those that describe a genus or class of which a particular product is a member, such as “CONVENIENT STORE retail stores, DRY ICE solid carbon dioxide, and LIGHT BEER ale-type beverages.” Generic terms can never be protected. The purpose of denying protection for these terms is to safeguard the public from having commonly used words and phrases removed from the “linguistic commons.” Certain marks that are originally distinctive may become generic through the public’s pervasive use of the term through a process known as “genericide.” Genericide occurs when the trademark ceases to identify the particular source of a product or service to the public and instead identifies a class of product or service. Common examples include ASPIRIN and ESCALATOR.

Since both parties sought ownership of the MOKE mark, the parties stipulated that the mark was distinctive and not generic. The district court found that a stipulation was insufficient and noted that the parties must set forth evidence that the mark was distinctive and not generic. The district court concluded that MOKE was once inherently distinctive but had become generic before either party sold a vehicle bearing the MOKE mark. Both parties appealed.

Seeking to overturn the district court’s finding of genericness, the parties argued that the district court was required to accept their stipulation of the MOKE mark’s distinctiveness. The Fourth Circuit disagreed, finding that blindly accepting a stipulation was incompatible with the court’s role of [...]

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A Lesson in Laches: You Waited Too Long to Start Your Kar

by Sarah Bro | May 2, 2024 | Trademarks

After the district court, on remand, held that laches did not bar relief, the US Court of Appeals for the Third Circuit again determined that the district court abused its discretion by not properly applying the presumption in favor of laches and issued an order to vacate and remand with instructions to dismiss a charity’s trademark infringement claims with prejudice. Kars 4 Kids Inc. v. America Can!, Case Nos. 23-1273; -1281 (3rd Cir. Apr. 17, 2024) (Bibas, Porter, Fisher, JJ.)

Kars 4 Kids and America Can! Cars for Kids are charities that sell donated vehicles to fund children’s education programs and have been engaged in a trademark dispute since 2003. Both parties have alleged federal and state trademark infringement, unfair competition and trademark dilution over their respective KARS 4 KIDS and CARS FOR KIDS trademarks. The parties were last before the Third Circuit in 2021, when the Court held that America Can was first to use its CARS FOR KIDS trademark in Texas, and Kars 4 Kids waived any challenge to the validity of America Can’s marks. In that 2021 decision, the Third Circuit also vacated the district court judgment in part and remanded the case for the district court to reexamine its laches and disgorgement conclusions, which had been decided in favor of America Can.

The Lanham Act does not contain a statute of limitations. Instead, it subjects all claims to the principles of equity. To determine whether laches bars a claim, a court considers two elements: whether the plaintiff inexcusably delayed in bringing suit, and whether the defendant was prejudiced as a result of the delay. With respect to the burden of proof for the laches claim at issue, America Can and Kars 4 Kids agreed that their Lanham Act claims were properly analogous to New Jersey’s six-year fraud statute. Therefore, because America Can first discovered the Kars 4 Kids trademark in Texas in 2003 and did not bring counterclaims until 2015, America Can was subject to a presumption that its claims were barred by laches unless it was able to prove both that its delay in filing suit was excusable and that it did not prejudice Kars 4 Kids.

On the issue of delay, the Third Circuit found that the district court erred because it did not find that America Can met its burden of establishing that its delay in bringing suit was excusable and that a reasonable person in its shoes would have waited to file suit. Instead, the district court improperly placed the burden on Kars 4 Kids to establish whether its advertisements in Texas were viewed by a sufficient number of Texans so as to put America Can on notice. As the Third Circuit explained, this was error. The district court should have held America Can to the burden of persuasion to show that it was not sufficiently aware of Kars 4 Kids’s use of its mark in Texas and to show what it did to identify and stop any potentially [...]

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Co-Authorship ≠ Co-Inventorship but Can Be Supportive of Inventive Contribution

by Cecilia Choy, Ph.D. | Jun 9, 2022 | Patents

The US Court of Appeals for the Federal Circuit vacated and remanded a Patent Trial & Appeal Board (Board) decision because it failed to resolve fundamental testimonial conflict relating to inventive contribution and complete the Duncan Parking analysis. Google LLC v. IPA Technologies Inc., Case Nos. 21-1179; -1180; -1185 (Fed. Cir. May 19, 2022) (Dyk, Schall, Taranto, JJ.)

Under Duncan Parking, analyzing whether a reference patent is “by another” requires the following three steps:

Determining what portions were relied on as prior art to anticipate the claim limitations at issue
Evaluating the degree to which those portions were conceived by another
Deciding whether that other person’s contribution is significant enough to render them a joint inventor of the applied portions of the reference patent.

SRI International filed two patent applications in 1999 related to the software-based Open Agent Architecture (OAA) and listed Martin and Cheyer as the inventors. In March 1998, an academic paper describing the OAA project was published and named these inventors and Moran as co-authors (Martin reference). During prosecution, the examiner identified the Martin reference as prior art and rejected the claims. SRI asserted that the Martin reference was not prior art because it was made by the same inventive entity as the patents. The patents were granted and assigned to IPA.

Google petitioned the Board for inter partes review of the patent claims. Google argued obviousness in view of the Martin reference and asserted that since the authors of the Martin reference (Martin, Cheyer, Moran) were not the same as the named inventive entity (Martin, Cheyer), the Martin reference was prior art “by others.” The Board instituted review but decided that Google did not meet its burden to provide sufficient support in establishing the correct inventive entity of the claimed subject matter and concluded that Moran’s testimony was insufficiently corroborated. Google appealed.

First, the Federal Circuit discussed the differences between burdens of persuasion and production and responded to Google’s argument that the Board improperly imposed a burden of proof. The Court found no error in the Board requiring Google to establish that the Martin reference was prior art “by another” by showing that Moran made a significant-enough contribution to qualify as a joint inventor on the relevant portions of the Martin reference.

Second, the Federal Circuit explained that the issue in this case was not the lack of corroboration for Moran’s testimony but rather whether his testimony should be credited over Cheyer and Martin’s conflicting testimony. The Court explained that to address joint inventorship under Duncan Parking, Moran “must have made an inventive contribution to the portions of the reference relied on and relevant to establishing obviousness.” Moran’s testimony could support co-inventorship of portions in the Martin reference relied on by Google and relevant to the challenged claims.

The Federal Circuit explained that although most corroboration cases involve issued patents, corroboration is also required for testimony that an individual is an inventor of a potentially invalidating, non-patent prior art reference. The record contained “more [...]

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