ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,407, issued on Sept. 23, was assigned to Canon K.K. (Tokyo).
"Aqueous ink, ink cartridge and ink jet recording method" was invented by Mikio Sanada (Kanagawa, Japan), Yoshiyuki Kaneko (Kanagawa, Japan), Yoshihisa Yamashita (Osaka, Japan), Junichi Sakai (Tokyo), Shoichi Takeda (Kanagawa, Japan) and Hideki Yamakami (Kanagawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An aqueous ink for ink jet recording includes a titanium oxide particle containing titanium oxide, at least part of the surface of the titanium oxide being covered with alumina and silica in specific proportions, in which the titanium oxide particle is dispersed at least by th...