U.S. Patent Law Changes from “First to Invent” to “First to File” Standard.  Plus:  New Discount on Filing Fees for Small Businesses and Inventors   This spring, patent law in the United States moved from a first-to-invent to a first-to-file system. The new law—called the America Invents Act (AIA)—puts the U.S. in harmony with most patent systems around the world, but it’s also a big change for inventors and other patent holders. You may have heard about the law before:  It passed last fall.  But it only went into effect in March.   Here’s RocketLawyer on the new set of…