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:
Jun. 07, 2011
Filed:
Sep. 28, 2007
Applicants:
Yoshiki Murayama, Anpachi-gun, JP;
Naoteru Matsubara, Ichinomiya, JP;
Katsuji Mabuchi, Gifu, JP;
Inventors:
Assignee:
Sanyo Electric Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 13/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
An electret device includes an electret film into which charges are injected and a barrier film provided on a surface of the electret film and having an electron affinity smaller than the electron affinity of the electret film.