ALEXANDRIA, Va., June 16 -- United States Patent no. 12,310,242, issued on May 20, was assigned to Seiko Epson Corp. (Tokyo).
"Piezoelectric element and liquid ejection head" was invented by Yasuaki Hamada (Nagano, Japan), Tomohiro Sakai (Nagano, Japan), Toshihiro Shimizu (Fujimi-machi, Japan) and Masao Nakayama (Nagano, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A piezoelectric element includes: a first electrode; an oxide layer formed on the first electrode; a piezoelectric layer formed on the oxide layer and containing potassium, sodium, and niobium; and a second electrode formed on the piezoelectric layer. When a potential difference of 10 V is applied between the first electrode and the second...