Background
MacNeil IP LLC holds patents on a vehicle floor tray — a thermoformed polymer floor mat designed to conform closely to the contours of a car’s foot well, providing better coverage and protection than traditional flat mats that can slip, bunch, or obstruct pedals. MacNeil marketed its WeatherTech brand floor liners, which became commercially successful. When Yita LLC challenged MacNeil’s patents in inter partes review (IPR), the Patent Trial and Appeal Board found that the prior art established a prima facie case of obviousness — a skilled artisan would have been motivated to combine the relevant references and would have had a reasonable expectation of success. However, the PTAB declined to find the claims obvious because it found MacNeil’s commercial success evidence compelling and indicative of nonobviousness. Yita appealed.
The critical question was whether MacNeil’s commercial success evidence had the necessary “nexus” to the claimed invention to carry weight in the obviousness analysis. MacNeil argued that the close conformance between its floor tray and the vehicle foot well — the key selling point of WeatherTech liners — was part of its patented invention. But the PTAB identified this feature as one that was found in the prior art; it was not novel to MacNeil’s claimed combination.
The Court’s Holding
The Federal Circuit reversed. The court clarified an important rule for nexus in secondary considerations: evidence of commercial success may be linked to the “inventive combination” of known elements only when no single feature alone is responsible for the commercial success — the success must be attributable to the combination as a whole. But if the commercial success stems from a specific feature that was already present in the prior art (and thus not an inventive contribution of the patent), that evidence cannot establish nexus with the patent’s claims.
Here, the PTAB had credited commercial success based on the close floor-conformance feature — precisely the feature it had also found in the prior art. Because the success was attributable to a feature that was individually known in the prior art rather than to the inventive combination, there was no proper nexus. The secondary considerations evidence therefore could not overcome the prima facie case of obviousness. The Federal Circuit reversed the PTAB’s finding and held the challenged claims unpatentable as obvious.
Key Takeaways
- Secondary consideration evidence (like commercial success) must have nexus to the claimed invention’s novel aspects — not to features that were already present in the prior art.
- The “inventive combination” exception to nexus applies only when no individual feature alone explains the secondary consideration evidence; if a known prior art feature drives the commercial success, the exception does not apply.
- A PTAB finding that a feature is in the prior art for obviousness purposes effectively precludes relying on that same feature to establish nexus for secondary considerations — the Board cannot have it both ways.
- Patent holders relying on commercial success, praise, or copying to support validity must be prepared to demonstrate that the success flows from what is genuinely new in the patent, not from features that competitors were already using.
Why It Matters
Yita v. MacNeil IP tightens the requirements for using commercial success as evidence of nonobviousness in IPR proceedings. The decision makes clear that a product’s market success does not automatically indicate that its patents are nonobvious — the success must be traced specifically to the patented innovation, not to features that were already known. For companies defending IPR challenges, this means that a strong sales record alone is not enough; the connection between the product’s success and its genuinely inventive features must be explicitly established and documented. For IPR petitioners, the decision provides a powerful argument: if the patent owner’s own commercial success evidence is tied to a prior art feature, that evidence should be disqualified from the nexus analysis entirely.