ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,497,689, issued on Dec. 16, was assigned to KENNAMETAL INC. (Latrobe, Pa.).
"Surface coated cutting tools" was invented by Zhenyu Liu (Greensburg, Pa.) and Kimaya Prakash Vyavhare (Irwin, Pa.).
According to the abstract* released by the U.S. Patent & Trademark Office: "In one aspect, cutting tools are described herein comprising wear resistant coatings employing one or more refractory layers of polycrystalline Alpha-Al2O3. Briefly, a coated cutting tool described herein comprises a substrate, and a coating adhered to the substrate, the coating comprising a layer of polycrystalline Alpha-Al2O3 deposited by chemical vapor deposition (CVD), wherein at least 5% of all grain boundaries in...