The chart above should be no surprise. Most pending applications before the PTO are now post-AIA patent applications. These are applications that were filed on or after March 16, 2013 and don’t claim priority to any prior patent filing. Note here that the PTO does not appear to enter the final AIA-status for some new applications filed with missing parts and so the numbers for the recently published cases may shift somewhat. The bulk of U.S. patents issue within four years of their priority filing date. However, there is a fairly long-tail. The patent with the longest pedigree for 2020 (thus far) is US10539396 for a dual-mode seeking missile (using both IR and RF sensors to direct a missile. The patent application was kept confidential on Gov’t order from 1976 – 2018.