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:
Mar. 03, 2015
Filed:
Apr. 26, 2010
Applicant:
Seiichi Takaoka, Osaka, JP;
Inventor:
Seiichi Takaoka, Osaka, JP;
Assignee:
Nitto Denko Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R 25/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An electret material having excellent charge retentivity against heat is provided. The electret materialincludes an electrode plate, a semiconducting layerformed on the electrode plate, and an electret layerformed on the semiconducting layer. The semiconducting layerincludes carbon and a fluororesin. This electret materialcan be inhibited from decreasing in the surface potential of the electret layerwhen heated to a high temperature.