The U.S. Court of Appeals for the Federal Circuit (CAFC) on Monday held that the Patent Trial and Appeal Board (PTAB) incorrectly found certain claims of SynQor, Inc.’s U.S. Patent No. 7,072,190 unpatentable as obvious in an inter partes reexamination proceeding. The CAFC said that the PTAB’s previous reexamination decisions on related patents gave rise to common law issue preclusion that collaterally estopped the Board from such a finding. Judge Hughes authored the majority opinion and Judge Dyk dissented, calling the ruling “without support and contrary to governing Supreme Court authority.”

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