Background
SRAM, LLC manufactures bicycle components and holds U.S. Patent No. 9,182,027, which covers a bicycle chainring designed to prevent the chain from slipping off during use. SRAM’s commercially successful X-Sync line of chainrings embodies the patented design and has enjoyed strong sales in the high-performance cycling market. Fox Factory petitioned the PTAB for inter partes review (IPR) of the ‘027 patent, arguing the claims were obvious over prior art.
The PTAB found the patent valid over the prior art, crediting SRAM’s evidence of commercial success as a secondary consideration supporting non-obviousness. The PTAB applied a presumption that the commercial success of the X-Sync chainrings was linked to (or “nexus” with) the patented features, supporting the validity finding. Fox Factory appealed.
The Court’s Holding
The Federal Circuit reversed and remanded. The court held that the PTAB applied an incorrect legal standard for the “nexus” requirement. To rely on commercial success as evidence of non-obviousness, a patent owner must show a nexus between the success and the specific features claimed in the patent. A presumption of nexus is available only when the commercial product is “coextensive” with the patent claims — i.e., the product essentially embodies the full scope of the claimed invention and nothing more.
Here, SRAM’s X-Sync chainrings included significant features beyond those claimed in the ‘027 patent. Critically, SRAM had itself described one unclaimed feature — a particular gap-filling design — as the “heart” of the product and had separately patented it. Because the commercial product’s success could be attributable to these unclaimed features, the presumption of nexus was improper. On remand, SRAM would bear the burden of affirmatively proving that the commercial success was driven by the patented features specifically.
Key Takeaways
- A presumption of nexus between commercial success and patent claims is only available when the commercial product is “coextensive” with the claims — meaning the product embodies the claims and nothing else of significance.
- When a commercial product contains significant features beyond those claimed, the patent owner must affirmatively prove nexus rather than relying on a presumption.
- Statements by a patent owner characterizing unclaimed product features as the “heart” or “critical” aspects of a product can defeat the presumption of nexus in a later obviousness challenge.
- The decision is an important reminder that secondary considerations evidence must be carefully tied to the specific claimed invention, not a broader commercial product.
Why It Matters
Secondary considerations — including commercial success, long-felt need, industry praise, and copying by competitors — can be powerful evidence of non-obviousness in patent validity disputes. Patent owners frequently rely on the success of commercial products embodying their patents to defend against obviousness challenges. Fox Factory v. SRAM clarified the limits of this strategy: if the successful product includes significant features beyond what the patent covers, you cannot simply point to the product’s success — you must prove that the success comes specifically from the patented features.
For patent litigators and prosecutors, the case underscores the value of claiming broadly enough to cover the key commercial embodiment of an invention, and the danger of separately patenting or publicly touting features outside the scope of the patent being defended. It also creates risk for companies that prominently market the unclaimed “highlights” of their products in a way that may later be used to undermine their patents.