ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,502,338, issued on Dec. 23, was assigned to GC Corp. (Shizuoka, Japan).
"Dental glass ionomer cement" was invented by Ayaka Ishida (Tokyo), Koji Tanaka (Tokyo), Ayaka Fujimoto (Tokyo) and Daizaburo Mori (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "One aspect of the present invention is: a dental glass ionomer cement including a first agent containing an ionomer glass powder; and a second agent containing a polycarboxylic acid polymer and water, wherein the first agent further contains a water-soluble compound represented by general formula (1):where R1 is a hydrogen atom or a methyl group, X1 is -O- or -NH-, and L1 is an alkylene group, and a w...