ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,441, issued on Nov. 18, was assigned to SEIKO EPSON Corp. (Japan).
"Ink jet ink composition and recording method" was invented by Shunsuke Uchizono (Shiojiri, Japan), Hiroaki Kumeta (Matsumoto, Japan), Soichi Yamazaki (Shiojiri, Japan) and Manabu Taniguchi (Shiojiri, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An ink jet ink composition includes: a colorant; silica particles; 1-(2-hydroxyethyl)-2-pyrrolidone; and water, and the silica particles have in a TEM image thereof, a Di (diameter of the maximum inscribed circle)/Dc (diameter of the minimum circumscribed circle) of 0.7 or more."
The patent was filed on March 22, 2022, under Applicat...