HBN Shoe, LLC filed a patent application for a cleated athletic shoe designed to allow the wearer's foot to plantarflex and evert while under load during weight-bearing exercises. The shoe features a forefoot cleat plate with a concave depression underlying the first metatarsal head. A patent examiner rejected the claims as obvious, citing a combination of two prior-art references: Auger, which disclosed a similar shoe with a concave depression, and Yoshida, which taught positioning such a depression to allow foot movement. The Patent Trial and Appeal Board affirmed the examiner's rejection, concluding that a person of ordinary skill in the art would have been motivated to combine these references to enhance ground gripping and foot flexibility. HBN Shoe appealed, arguing that the Board erred in its claim construction and failed to properly weigh evidence, including a declaration from one of the inventors.
The Federal Circuit reviewed the Board's decision de novo for legal errors and for substantial evidence regarding factual findings. The court affirmed the Board's determination that the invention was obvious. HBN argued that the phrase 'configured to permit' in the claims required a specific intended design rather than mere capability, but the court found the Board did not adopt an erroneous claim construction because HBN had not requested such a construction below. Instead, HBN argued that the prior art structures were incapable of performing the function, but the Board found substantial evidence that the modified Auger-Yoshida structure met the functional limitation. The court also upheld the Board's rejection of the inventor's declaration, noting that the Board reasonably found the declaration unpersuasive because it conflicted with the inventor's earlier published work. Regarding the argument of hindsight, the court found the Board provided a cogent reason for combining the references: to enhance ground gripping and allow forefoot joints to bend. Finally, the court clarified that the size of the depression was not a claim limitation, rendering HBN's redesign arguments irrelevant to the obviousness of claim 1.
The patent application for the cleated shoe remains rejected, preventing HBN Shoe from obtaining patent protection for the design. The decision reinforces that combining known structural elements to achieve a predictable result, such as foot flexibility, constitutes obviousness even if the specific size of a feature is not claimed. It also signals that inventor declarations may be given little weight if they contradict the inventor's own prior published work.
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