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:
Nov. 27, 2012
Filed:
Nov. 04, 2010
Applicants:
Tohru Yamaoka, Osaka, JP;
Hiroshi Ogura, Tokyo, JP;
Yuichi Miyoshi, Osaka, JP;
Inventors:
Assignee:
Panasonic Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R 25/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An electret condenser includes a fixed filmincluding a conductive filmto be an upper electrode, a vibrating filmincluding a lower electrodeand a silicon oxide filmto be an electret film, and a silicon oxide filmprovided between the fixed filmand the vibrating filmand including an air gapRespective parts of the fixed filmand the vibrating filmexposed in the air gapare formed of silicon nitride filmsand