ALEXANDRIA, Va., June 18 -- United States Patent no. 12,325,659, issued on June 10, was assigned to EUROKERA S.N.C. (Chateau Thierry, France).
"Glass-ceramic article" was invented by Theo Jegorel (Paris) and Erwann Luais (Chateau Thierry, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "A glass-ceramic article, includes at least one substrate, such as a plate, made of glass-ceramic, the substrate being coated in at least one zone with at least one stack formed 1) of at least one first layer of metal nitride or of semimetal nitride, the first layer exhibiting a thickness of at least 200 nm and a hardness of at least 14 GPa, and 2) of at least one second layer of metal oxide or of semimetal nitride, the s...