ALEXANDRIA, Va., March 19 -- United States Patent no. 12,251,934, issued on March 18, was assigned to Canon K.K. (Tokyo).
"Liquid ejection head" was invented by Ryo Sato (Tokyo), Kyosuke Toda (Kanagawa, Japan) and Shimpei Yoshikawa (Kanagawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A liquid ejection head has: a frame having a plurality of ejection ports for ejecting a liquid; a common liquid chamber; a plurality of individual liquid chambers through which the common liquid chamber communicates with each of the ejection ports; and a plurality of energy generating elements disposed in respective individual liquid chambers. A part of a wall of the frame that forms the common liquid chamber is forme...