The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 17, 2026
Filed:
Jul. 02, 2020
Applicant:
Sumitomo Chemical Company, Limited, Tokyo, JP;
Inventors:
Toshiaki Kuroda, Hitachi, JP;
Kenji Shibata, Hitachi, JP;
Kazutoshi Watanabe, Hitachi, JP;
Takeshi Kimura, Hitachi, JP;
Assignee:
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 41/187 (2006.01); H10N 30/00 (2023.01); H10N 30/076 (2023.01); H10N 30/853 (2023.01);
U.S. Cl.
CPC ...
H10N 30/8542 (2023.02); H10N 30/076 (2023.02); H10N 30/704 (2024.05);
Abstract
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 (KNa)NbO(0<x<1), wherein the piezoelectric film contains at least one element selected from a group consisting of Cu and Mn, and an amount of the element present at a grain boundary of crystals constituting the piezoelectric film is greater than that of the element present in a matrix phase of the crystals.