(September 19, 2019, 1:50 PM EDT) -- WASHINGTON, D.C. — In a Sept. 10 appellant brief, Power Integrations Inc. (PI) tells the Federal Circuit U.S. Court of Appeals that the Patent Trial and Appeal Board confirmed the validity of a circuit patent based on an “entirely new theory presented for the first time” in its final written decision (Power Integrations Inc. v. Semiconductor Components Industries LLC, Nos. 2019-1863, -1868, Fed. Cir.)....