US Patent Issued to Sumitomo Chemical on July 14 for "Piezoelectric stack, piezoelectric element, and method of manufacturing piezoelectric stack" (Japanese Inventors)

ALEXANDRIA, Va., July 14 -- United States Patent no. 12,685,024, issued on July 14, was assigned to Sumitomo Chemical Co. Ltd. (Tokyo).

"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: "There is provided a piezoelectric stack, including: a substrate; an oxide film on the substrate, containing zinc and oxygen as main elements; an electrode film on the oxide film; and a piezoelectric film on the electrode film, being an alkali niobium oxide film containing potassium, sod...