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:
Jun. 23, 2026
Filed:
Feb. 24, 2021
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 ...
H10N 30/00 (2023.01); C30B 28/12 (2006.01); C30B 29/02 (2006.01); C30B 29/30 (2006.01); C30B 29/68 (2006.01); H10N 30/076 (2023.01); H10N 30/853 (2023.01);
U.S. Cl.
CPC ...
H10N 30/8542 (2023.02); C30B 28/12 (2013.01); C30B 29/02 (2013.01); C30B 29/30 (2013.01); C30B 29/68 (2013.01); H10N 30/076 (2023.02);
Abstract
There is provided a piezoelectric film, being a polycrystalline film comprised of potassium sodium niobate; containing at least one metal element selected from a group consisting of Cu and Mn; and having 1.0 or less ratio of a concentration B of the metal element at grain boundaries of crystals, with respect to a concentration A of the metal element in a matrix phase of the crystals.