prosecution history estoppel

Even Preliminary Proceeding Arguments Notice the Public

It is well-established that statements made by a Patent Owner during an inter partes review (IPR) can constitute prosecution disclaimer— even in papers filed by a Patent Owner before the trial. Aylus Networks, Inc. v. Apple Inc., No. 2016-1599 (Fed. Cir. May 11, 2017)

As a reminder, prosecution disclaimer prevents a patentee that clearly and unmistakably disclaimed a certain meaning for its patent claims during prosecution from recapturing this same meaning during claim construction in a subsequent litigation. As was the case in Aylus, Patent Owners are learning that the timing of such a disclaimer, or lack of express adoption by the Patent Trial & Appeal Board (PTAB), is of no moment. Continue Reading Beware Prosecution History in PTAB Trials