ALEXANDRIA, Va., June 4 -- United States Patent no. 12,319,822, issued on June 3, was assigned to SEIKO EPSON Corp. (Japan).
"Ink jet composition and ink jet recording method" was invented by Koichi Terao (Suwa, Japan), Soichi Yamazaki (Shiojiri, Japan), Nikako Tsukiji (Matsumoto, Japan), Harunobu Komatsu (Matsumoto, Japan) and Koji Horiba (Atsugi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An ink jet composition of the present disclosure includes: water; a polyester resin having sulfo groups; a colorant; and a high molecular weight dispersant having anionic groups, the colorant is contained in particles formed from a material containing the polyester resin, and a rate X1 [percent on molar basis] o...