Invention Grant
- Patent Title: Electret
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Application No.: US17116217Application Date: 2020-12-09
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Publication No.: US11558694B2Publication Date: 2023-01-17
- Inventor: Yoshihiro Kozawa , Noriyuki Matsushita , Kazuhiko Kanoh , Yumi Tanaka , Tomoya Maruyama , Hiroshi Okamoto , Naoya Morioka , Katsuyoshi Saiki
- Applicant: DENSO CORPORATION , TOKYO UNIVERSITY OF SCIENCE FOUNDATION
- Applicant Address: JP Kariya; JP Tokyo
- Assignee: DENSO CORPORATION,TOKYO UNIVERSITY OF SCIENCE FOUNDATION
- Current Assignee: DENSO CORPORATION,TOKYO UNIVERSITY OF SCIENCE FOUNDATION
- Current Assignee Address: JP Kariya; JP Tokyo
- Agency: Posz Law Group, PLC
- Priority: JPJP2019-225737 20191213,JPJP2020-164899 20200930
- Main IPC: H04R19/01
- IPC: H04R19/01 ; C04B35/50 ; C04B35/44 ; H04R19/00 ; H01G7/02
Abstract:
An electret includes a composite oxide having an ABO3 type 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.
Public/Granted literature
- US20210185451A1 ELECTRET Public/Granted day:2021-06-17
Information query
