ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,548,594, issued on Feb. 10, was assigned to HOYA Corp. (Tokyo).
"Substrate for magnetic disk and magnetic disk" was invented by Kinobu Osakabe (Tokorozawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A substrate for a magnetic disk includes a substrate main body and a film. The substrate main body has two opposing main surfaces and an outer circumferential edge surface, and the outer circumferential edge surface includes a side wall surface, which is orthogonal to the main surfaces, and chamfered surfaces, which are disposed between the main surfaces and the side wall surface. The substrate main body is a glass substrate main body or an aluminu...