Background
Columbia Sportswear North America, Inc. makes outdoor apparel incorporating its patented Omni-Heat technology — a heat-reflective material featuring a distinctive wavy-line pattern of metallic dots that reflects body heat back to the wearer. Columbia holds U.S. Design Patent No. D657,093 covering the visual design of this heat-reflective material. Seirus Innovative Accessories, Inc. markets gloves, headwear, and other outdoor products incorporating its own “HeatWave” material, which features a similar wavy-line pattern.
Columbia sued Seirus for design patent infringement. At trial, Seirus introduced prior art designs — including waving and undulating patterns found in other types of fabric and materials, not all of which were heat-reflective or used in the same type of apparel as Columbia’s patented design — to help the jury determine that an ordinary observer would not find Seirus’s design to be substantially similar to Columbia’s. The jury returned a verdict of non-infringement. Columbia appealed, arguing that the district court erroneously allowed the jury to consider comparison prior art from different types of articles — not limited to the same category of heat-reflective materials as the patented design.
The Court’s Holding
The Federal Circuit resolved an issue of first impression: what is the proper scope of “comparison prior art” that may be shown to the jury in a design patent infringement case? Under the Gorham ordinary observer test, infringement is found when an ordinary observer would mistake an accused design for the claimed design. Comparison prior art can be shown to the jury to educate the ordinary observer and help calibrate the similarity analysis — but what types of prior art qualify?
The Federal Circuit held that comparison prior art in a design patent infringement case must be limited to the same article of manufacture as identified in the asserted design patent claim. If the design patent claims a heat-reflective material, comparison prior art must also be heat-reflective materials (or the relevant article type), not generic fabric designs or unrelated products. This limitation aligns comparison prior art with the scope of anticipating prior art for design patent invalidity purposes — both must relate to the same article of manufacture. The court vacated the non-infringement verdict and remanded for a new trial applying the correct jury instruction.
Key Takeaways
- Comparison prior art in design patent infringement litigation is limited to prior art from the same article of manufacture as the design patent claim — defendants cannot introduce a broad array of unrelated designs from different product categories.
- The ordinary observer test for design patent infringement must be calibrated using prior art that is relevant to the article at issue, not just visually similar designs from other contexts.
- This ruling harmonizes the scope of comparison prior art with the scope of anticipating prior art: both must come from the same article of manufacture as the claimed design.
- Design patent owners now have a stronger hand in infringement litigation — defendants can no longer muddy the waters by parading dissimilar products before the jury to artificially diminish the claimed design’s distinctiveness.
Why It Matters
Design patent law experienced significant attention in the 2010s following the Apple v. Samsung smartphone litigation, and the Federal Circuit has continued to refine design patent doctrine case by case. This ruling strengthens design patent protection by constraining the type of prior art that defendants can use to defeat infringement claims. Before this decision, defendants had some latitude to introduce visually similar designs from unrelated product categories — potentially confusing juries about what the claimed design actually covered and how distinctive it was.
For design patent holders in fashion, consumer electronics, furniture, and industrial products, the ruling is a significant win: the jury’s comparison must be grounded in the actual market for the patented article. For defendants, it means that prior art searches for design patent litigation must focus narrowly on the article category in the claim, not on broadly similar aesthetic designs from other contexts. The decision is part of a broader modernization of design patent law that culminated in the en banc LKQ v. GM decision in 2024, which overhauled the design patent obviousness standard.