Recent Cases Warn Of Dangers Of Trying For Second Bite At The IPR Apple

The American Invents Act of 2011 (AIA) created inter partes review (IPR), a new opposition-like proceeding conducted at the US Patent Trial and Appeal Board (PTAB) in the US Patent and Trademark Office to challenge the validity of patent claims based on prior art patents and printed publications. Since then, conventional wisdom has advised filing a petition for IPR quickly after being sued for patent infringement, because any deficiencies or mistakes the PTAB identifies could be corrected with a second petition later on. Several recent decisions from the PTAB reveal limits to that strategy.









