US Patent Issued to SEIKO EPSON on March 18 for "Ink jet ink composition, ink set, and ink jet recording method" (Japanese Inventors)

ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,620, issued on March 18, was assigned to SEIKO EPSON Corp. (Japan).

"Ink jet ink composition, ink set, and ink jet recording method" was invented by Kohei Ishida (Matsumoto, Japan), Kohei Sharyo (Kyoto, Japan) and Tsuyoshi Fukushima (Kyoto, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An ink jet ink composition which is an aqueous ink includes a resin dispersion, in which the resin dispersion is a polyurethane resin dispersion formed of a polyurethane resin (U) obtained by reacting an active hydrogen atom-containing component (A) containing a high-molecular-weight polyol component (a1) having a number-average molecular weight of 500 or more...