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:
Jan. 17, 2023
Filed:
Dec. 09, 2020
Denso Corporation, Kariya, JP;
Tokyo University of Science Foundation, Tokyo, JP;
Yoshihiro Kozawa, Kariya, JP;
Noriyuki Matsushita, Kariya, JP;
Kazuhiko Kanoh, Kariya, JP;
Yumi Tanaka, Tokyo, JP;
Tomoya Maruyama, Tokyo, JP;
Hiroshi Okamoto, Kariya, JP;
Naoya Morioka, Kariya, JP;
Katsuyoshi Saiki, Kariya, JP;
DENSO CORPORATION, Kariya, JP;
TOKYO UNIVERSITY OF SCIENCE FOUNDATION, Tokyo, JP;
Abstract
An electret includes a composite oxide having an ABOtype perovskite structure containing two different metal elements A and B. The composite oxide is in a polarized state, at least a part of one of the metal elements A and B is substituted with a dopant element having a lower valence than the one of the metal elements A and B, and the composite oxide has a bandgap energy of 4 eV or more.