In what appears to be the first district court case to address the issue directly, Judge Lefkow of the United States District Court for the Northern District of Illinois held that 35 U.S.C. § 315(e)(2) estoppel does not preclude parties from raising grounds in a civil litigation that were cumulative of grounds that could have been asserted during that party’s prior IPR proceeding, so long as the grounds are based on prior art that was not reasonably available during the IPR.
Continue Reading District Court Interprets IPR Estoppel Provision to Permit Reliance
Remember when the PTAB 
Update: Overruled in part by 
In its seventh PGR institution, the PTAB recently decided for the first time that a patent asserting a pre-AIA effective filing date was eligible for post-grant review because it contained at least one claim that was only entitled to a post-AIA effective filing date. Although some claims were entitled to a pre-AIA effective filing date, PGR was instituted for all of the patent claims, on all five of the prior art grounds asserted by the petitioner. 
If you’re a patent owner faced with an expert declaration submitted by an IPR petitioner on reply, try to respond, and in multiple ways. Don’t just complain that the declaration should be excluded. This was the Federal Circuit’s recent message in 
Two recent PTAB final written decisions highlight the benefits that the “broadest reasonable interpretation” standard for claim construction provides to Petitioners, as well as the difficulty Petitioners face in proving inherent anticipation. The PTAB instituted two IPRs on the same patent: one on an anticipation ground, and another on an obviousness ground. The Petitioner failed to prove anticipation, but prevailed on obviousness of all claims of the patent.