Same Article, Same Comparison: Columbia Sportswear v. Seirus and Design-Patent Prior Art

The Federal Circuit held that comparison prior art in a design-patent case must be applied to the same article of manufacture claimed in the patent, reshaping the ordinary-observer test.

By Lidiia Levitska  ·  March 23, 2026
Close-up of wavy patterned reflective lining inside a winter glove and jacket
A wave-patterned heat-reflective lining drove a fight over how to compare designs to the right prior art. Shutterstock
Educational content, not legal advice. This article explains general legal concepts. It does not create an attorney–client relationship. For your specific situation, consult a licensed attorney.

Design patents protect the way a product looks, and infringement turns on the deceptively simple “ordinary observer” test: would an ordinary observer, familiar with the prior art, find the accused design substantially the same as the patented one? In Columbia Sportswear North America, Inc. v. Seirus Innovative Accessories, Inc., 80 F.4th 1363 (Fed. Cir. 2023), the Federal Circuit answered a question it had never squarely resolved: what prior art counts as the “context” for that comparison. The answer, delivered September 15, 2023, was crisp: comparison prior art must be applied to the same article of manufacture recited in the claim. The ruling rewired how juries in design cases are instructed and sent a high-profile dispute over wavy-lined heat-reflective material back to the district court.

At a glance

  • Case: Columbia Sportswear North America, Inc. v. Seirus Innovative Accessories, Inc., No. 2021-2299, 80 F.4th 1363 (Fed. Cir. Sept. 15, 2023).
  • Court: U.S. Court of Appeals for the Federal Circuit; opinion by Judge Prost for a panel including Judges Reyna and Hughes.
  • Posture: Appeal after a jury found Seirus did not infringe U.S. Design Patent No. D657,093; earlier proceedings had bounced between summary judgment and trial.
  • Holding: To qualify as comparison prior art, a prior-art design must be applied to the article of manufacture identified in the claim; failing to instruct the jury on that limit was error. The non-infringement verdict is vacated and remanded.
  • Significance: First-impression ruling defining the scope of comparison prior art in design-patent infringement and aligning it with the scope of anticipatory prior art.

The wave-pattern dispute

Columbia owns Design Patent D657,093, which claims an ornamental design (a pattern of contrasting wavy lines) for a heat-reflective material. Seirus sells gloves and other cold-weather products incorporating its “HeatWave” lining, which likewise features a wavy pattern, interrupted at intervals by Seirus’s logo. Columbia sued, and the case took a winding path: an early summary-judgment win for Columbia was vacated, and at the eventual jury trial Seirus prevailed on non-infringement. A central battleground was what other wave-patterned materials the jury could consider when judging similarity. The district court let Seirus introduce comparison prior art consisting broadly of “wave patterns on fabric,” without requiring that the prior designs be applied to the same kind of article Columbia’s patent claimed.

What counts as comparison prior art

On appeal, Columbia argued that the universe of comparison prior art is not any wave pattern anywhere, but only prior designs applied to the same article of manufacture the patent claims. The Federal Circuit agreed, calling the precise question one of first impression. It held that “to qualify as comparison prior art, the prior-art design must be applied to the article of manufacture identified in the claim.” The court gave three reasons. First, the rule best serves comparison prior art’s purpose, which is to help an ordinary observer compare the claimed and accused designs in proper context: context drawn from the relevant product field, not unrelated objects. Second, it is consistent with Supreme Court and Federal Circuit precedent treating design patents as tied to particular articles of manufacture. Third, it harmonizes comparison prior art with anticipatory prior art, which already must be applied to the same article to invalidate a design claim. It would be incoherent, the court reasoned, for the two categories of prior art to have different scopes.

Seirus’s HeatWave material interrupts its wave pattern with the Seirus logo. On this appeal, Columbia’s logo argument was aimed at the jury instructions: it said the district court should have told the jury that consumer confusion as to source is irrelevant to design-patent infringement, and that no likelihood of confusion need be found. The Federal Circuit disagreed and rejected those challenges, seeing “no legal error or abuse of discretion in the district court’s jury instructions.” Along the way it restated the framework from its earlier decision in this same dispute: design-patent infringement “is not avoided ‘by labelling,’” but precedent “does not prohibit the fact finder from considering an ornamental logo, its placement, and its appearance as one among other potential differences between” a claimed and an accused design. The logo is not a magic shield, but neither is it invisible; the factfinder weighs it along with everything else. The vacatur rested solely on the comparison-prior-art instruction, which the court held was error and prejudicial on this record, so it vacated the non-infringement judgment and remanded for further proceedings.

Why the framing matters

The scope of comparison prior art has real outcome consequences. The ordinary-observer test is comparative: when the prior art is crowded with designs close to the patented one, small differences loom large and infringement is harder to prove; when the relevant prior art is sparse, even modest similarity can support infringement. By confining comparison prior art to the claimed article of manufacture, Columbia narrows the field a defendant can use to argue “everyone was already doing this,” which generally makes design-patent infringement somewhat easier to establish. The decision thus does more than tidy doctrine. It shifts litigation leverage toward design-patent owners while keeping the analysis anchored to the specific product the patent actually claims.

Open questions

  • How granular is “the same article of manufacture”? The court tied comparison prior art to the claimed article, but disputes will arise over how broadly or narrowly that article is defined in a given patent’s claim.
  • How far does the logo principle extend? Allowing a logo into the overall comparison invites case-by-case fights about when ornamentation meaningfully changes the visual impression versus merely labels a copy.
  • What happens on remand and beyond? The vacatur reset the infringement question; how juries apply the narrowed prior-art rule in practice remains to be seen. The Supreme Court declined to take up Seirus’s challenge, denying certiorari on May 20, 2024 (No. 23-1052).

Implications

  • For design-patent owners: Object to overbroad comparison prior art; insist that any prior design offered for the ordinary-observer comparison be applied to the same article your patent claims.
  • For accused infringers: Reframe invalidity and non-infringement defenses around prior art tied to the claimed article. Generic “this look existed somewhere” evidence is now off-limits as comparison prior art.
  • For litigators: Jury instructions are decisive in design cases; a failure to cabin comparison prior art to the claimed article is now clear reversible error.
  • For product designers: Adding a logo to a copied design will not reliably defeat infringement, because the accused product is judged as a visual whole.
  • For drafters: Define the article of manufacture in a design claim with care, because that definition now controls the prior-art context against which infringement is measured.

Frequently asked questions

What is comparison prior art in a design-patent case? It is prior-art design that a jury uses as context when applying the ordinary-observer test, helping the factfinder judge how similar the patented and accused designs really are against the backdrop of what came before. The closer the prior art, the more attention an ordinary observer pays to small differences.

What did Columbia Sportswear v. Seirus decide? The Federal Circuit held, as a matter of first impression, that to qualify as comparison prior art a prior design must be applied to the same article of manufacture identified in the design-patent claim. It vacated the non-infringement judgment because the jury had not been so instructed and remanded for further proceedings.

Can an accused product’s logo defeat design-patent infringement? A logo does not automatically avoid infringement, but the Federal Circuit reaffirmed that an accused design’s ornamentation, including a logo, may be considered as part of the overall comparison an ordinary observer makes. It is one element of the visual whole, not a free pass.

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Lidiia Levitska
About the Author

Lidiia Levitska

International Intellectual Property Attorney

Lidiia Levitska focuses on intellectual property dispute resolution, policy, and advisory work across international institutions and government bodies. From 2021 to 2025 she served at the World Intellectual Property Organization (WIPO), managing arbitration cases and overseeing compliance with the Uniform Domain-Name Dispute-Resolution Policy (UDRP), and earlier led IP policy research as a Senior Policy Officer at the American Chamber of Commerce in Ukraine. She holds an LL.M. in International Intellectual Property Law from Chicago-Kent College of Law and an M.A. in Information Technology Law from the University of Tartu, and was admitted to the Ukrainian Bar in 2019.

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