(August 15, 2019, 11:50 AM EDT) -- ALEXANDRIA, Va. — A petition for inter partes review filed with the Patent Trial and Appeal Board on Aug. 13 asserts that a patented solar-assisted refrigeration system would have been obvious to a person of skill in the art at the time of patenting (SunTrac Solar Manufacturing LLC v. DZSolar Ltd., No. IPR2019-01492, PTAB)....