ALEXANDRIA, Va., March 17 -- United States Patent no. 12,575,916, issued on March 17, was assigned to GC Corp. (Sunto-gun, Japan).
"Block for dental prostheses" was invented by Katsuhito Kato (Itabashi-ku, Japan), Shigenori Akiyama (Itabashi-ku, Japan) and Toshihiko Azuma (Itabashi-ku, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A block for dental prostheses is in the form of a column or a board, a main crystalline phase of the block being of lithium disilicate, and when the block is observed in a field of view of a partially enlarged cross section of the block, the proportion of the total area of crystals having a length of at least 0.5 micro metre, the crystals appearing in the field of view, to a...