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:
Feb. 27, 2024
Filed:
Dec. 09, 2020
Applicants:
Denso Corporation, Kariya, JP;
Tokyo University of Science Foundation, Tokyo, JP;
Inventors:
Noriyuki Matsushita, Kariya, JP;
Yoshihiro Kozawa, Kariya, JP;
Kazuhiko Kanoh, Kariya, JP;
Yumi Tanaka, Tokyo, JP;
Hirotoshi Otsuka, Tokyo, JP;
Yuki Kotaka, Tokyo, JP;
Assignees:
DENSO CORPORATION, Kariya, JP;
TOKYO UNIVERSITY OF SCIENCE FOUNDATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01G 7/02 (2006.01); C01F 17/34 (2020.01); C01B 25/32 (2006.01);
U.S. Cl.
CPC ...
H01G 7/025 (2013.01); C01B 25/32 (2013.01); C01F 17/34 (2020.01); C01P 2002/34 (2013.01); C01P 2006/40 (2013.01);
Abstract
An electret includes an electret layer. The electret layer is formed by subjecting a composite film in which inorganic dielectric particles are dispersed and held in a base film to a polarization treatment. The inorganic dielectric particles are mainly composed of an inorganic dielectric material having a bandgap energy of 4 eV or more.