Intellectual property practitioners have been using the post-grant proceedings codified in the America Invents Act to challenge issued patents for almost three years now.The object of the post-grant proceedings is to allow a way to review the validity of patents through the use of a faster, less expensive adjudication at the Patent Trial and Appeal Board instead of through U.S. District Court patent litigation. The post-grant proceedings became available in September 2012, and the three-year check-in point is fast …