
A patent interference is an adversarial proceeding where each party is trying deprive its opponent of a patent on an invention that that the Patent Office has already decided is patentable. Long after the AIA became effective to phase out interferences, the Patent Trial and Appeal Board continues to declare and administer them where at least one of the parties has an interfering application or patent predating the AIA’s enactment. The Board declares interferences to avoid the embarrassment and marketplace chaos where the Patent Office issues two patents on the same invention to different parties, and to avoid awarding a patent monopoly to the entity who was not the first to invent.
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Adidas successfully petitioned the Patent Trial and Appeal Board in 2012 to review a Nike shoe patent. During that review, Nike filed a motion to amend the patent by canceling all claims and substituting four new claims. The Board canceled the patent claims and found the new claims unpatentable. Among other things, the Board said that Nike—the patent owner—did not establish the new claims were patentable over the prior art.

