The defendant filed a petition for Inter Partes Review (“IPR”) with the Patent Office. As part of its application, it submitted a 65 page brief along with several hundred page s of accompanying evidence. The plaintiffs submitted a 60 page brief along with its own evidence in response. After the Patent Office declined to institute review of the patent-in-suit, the plaintiffs contended that the denial of the IPR was a final decision by an administrative board and that the defendant was collaterally estopped from bringing those same arguments again before the district court.
After reviewing the law on collateral estoppel, the district court noted that the defendant “did not make it past the preliminary proceedings in their attempted IPR.” The district court concluded that this was important for several reasons. “First, it means a ‘trial’ was never conducted o[n] the merits. Instead, the ‘proceedings’ were limited to a single petition brief, a response, and any accompanying evidence. Second, there was not a final written decision issued. The Board denied further review, that is, it denied initiating the IPR proceedings. Accordingly, no final written decision was necessary.”
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