Someone stole your invention and filed for a patent on it? Derivation proceedings in the Patent Office may be an answer. The Leahy-Smith America Invents Act (AIA) amended 35 U.S.C. § 135 to replace interference proceedings with a new process called derivation proceedings. This change took effect on March 16, 2013. But despite over three and a half years since this change, little is known about this procedure as few have been filed.