
Looking Behind The Different Invalidation Rates Of Oppositions And IPRs
Opposition proceedings in Europe have long served as a powerful tool for third parties to challenge the validity of a patent before the European Patent Office (EPO). Now, under the America Invents Act (effective September 2012), the United States (US) has two new procedures for challenging the validity of a patent before the US Patent and Trademark Office (USPTO): inter partes review (IPR) and post-grant review. Current statistics indicate a higher invalidation rate for IPRs as compared to EPO oppositions.











