ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,486,416, issued on Dec. 2, was assigned to Canon K.K. (Tokyo).
"Aqueous ink, ink cartridge and ink jet recording method" was invented by Takeshi Ota (Kanagawa, Japan), Katsuhiro Hayashi (Kanagawa, Japan), Tsuyoshi Furuse (Kanagawa, Japan) and Keiichi Ito (Kanagawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An aqueous ink jet ink contains a pigment, a resin and an additive. The resin has a unit containing a carboxylic acid group and a unit containing an aromatic group. The additive is at least one member selected from the group consisting of butanedicarboxylic acid, pentanedicarboxylic acid, pentanetricarboxylic acid, hexanedicarboxylic acid, h...