ALEXANDRIA, Va., Aug. 6 -- United States Patent no. 12,378,426, issued on Aug. 5, was assigned to SEIKO EPSON Corp. (Japan).
"Ink jet ink composition" was invented by Hisashi Okamura (Shiojiri, Japan), Hidehiko Komatsu (Chino, Japan), Hiromi Noguchi (Shiojiri, Japan), Yuzuka Kumagai (Shiojiri, Japan) and Yasuhiro Oki (Matsumoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An ink jet ink composition includes a coloring material, a water-soluble organic solvent, and water. The coloring material contains a compound (A) having Cr (chromium) as Me in a structure represented by formula (1) below, and a compound (B) having Co (cobalt) as Me in the structure represented by the formula (1) below, and the mas...