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:
Apr. 27, 2010
Filed:
Feb. 24, 2005
Applicants:
Hiroshi Ogura, Tokyo, JP;
Tohru Yamaoka, Osaka, JP;
Inventors:
Hiroshi Ogura, Tokyo, JP;
Tohru Yamaoka, Osaka, JP;
Assignee:
Panasonic Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R 25/00 (2006.01); H01L 29/78 (2006.01);
U.S. Cl.
CPC ...
Abstract
An electret condenserincludes a fixed electrode, a vibrating electrode, an electretized silicon dioxide filmformed between the electrodes, and silicon nitride filmsandformed so as to cover the silicon dioxide film. The silicon dioxide filmcovered with the silicon nitride filmsandis formed on the vibrating electrode