ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,735,591, issued on Sept. 15, was assigned to SEIKO EPSON Corp. (Japan).
"Ink composition for ink jet printing" was invented by Hidehiko Komatsu (Chino, Japan), Yasuhiro Oki (Matsumoto, Japan) and Shintaro Hama (Matsumoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is an ink composition for ink jet printing containing a coloring material, a water-soluble organic solvent, and water. The coloring material contains a compound A represented by Formula (1) and a compound B represented by Formula (2) and a mass ratio (a/b) of a content a of the compound A to a content b of the compound B is 1.0 or more and 99 or less."
The patent was filed...