ALEXANDRIA, Va., July 16 -- United States Patent no. 12,358,281, issued on July 15, was assigned to Seiko Epson Corp. (Tokyo).
"Liquid ejection apparatus and print head" was invented by Sukehiro Ito (Nagano, Japan) and Masayuki Kawakami (Nagano, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A liquid ejection apparatus includes a control circuit that outputs a control signal, a first drive signal output circuit that outputs a first drive signal, and a print head that ejects a liquid, in which the print head includes a piezoelectric element that is driven by receiving the first drive signal, a pressure chamber substrate that is provided with a plurality of pressure chambers of which volumes change due t...