ALEXANDRIA, Va., June 12 -- United States Patent no. 12,296,584, issued on May 13, was assigned to Canon K.K. (Tokyo).
"Liquid ejection head and liquid ejection apparatus" was invented by Koichi Ishida (Tokyo) and Shuzo Iwanaga (Kanagawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A liquid ejection head includes a print element substrate having an ejection port surface in which a plurality of ejection ports are arranged and a temperature control unit that controls a temperature of the ejection port surface. The print element substrate ejects a liquid from the plurality of ejection ports onto a medium moved by the liquid ejection head relatively to the liquid ejection head. The ejection port surface...