US Patent Issued to Sumitomo Chemical on March 17 for "Piezoelectric film, piezoelectric stack, piezoelectric element, and method of manufacturing piezoelectric stack" (Japanese Inventors)

ALEXANDRIA, Va., March 17 -- United States Patent no. 12,581,862, issued on March 17, was assigned to Sumitomo Chemical Co. Ltd. (Tokyo).

"Piezoelectric film, piezoelectric stack, piezoelectric element, and method of manufacturing piezoelectric stack" was invented by Toshiaki Kuroda (Hitachi, Japan), Kenji Shibata (Hitachi, Japan), Kazutoshi Watanabe (Hitachi, Japan) and Takeshi Kimura (Hitachi, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A piezoelectric stack including: a substrate; an electrode film; and a piezoelectric film as a poly-crystal film comprising an alkali niobium oxide of a perovskite structure represented by a composition formula of (K1-xNax)NbO3 (0greater thanxgreater than1), wherei...