ALEXANDRIA, Va., June 17 -- United States Patent no. 12,312,558, issued on May 27, was assigned to KAO Corp. (Tokyo).
"Anti-staining agent" was invented by Satoru Okamura (Wakayama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention is an anti-staining agent containing, (a) a sulfosuccinic acid branched alkyl ester in which the branched alkyl group is a branched alkyl group with 8 or more and 13 or less carbons [hereinafter referred to as component (a)]. Further, the present invention is an anti-staining method including bringing a treatment liquid into contact with an object to be treated, the treatment liquid containing component (a)."
The patent was filed on Dec. 14, 2021, under A...