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. 15, 2011
Filed:
Jul. 06, 2007
Applicant:
Kanjiro Shimizu, Chiba, JP;
Inventor:
Kanjiro Shimizu, Chiba, JP;
Assignee:
Sony Ericsson Mobile Communications Japan, Inc., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G08B 13/18 (2006.01); H01Q 11/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention provides a contactless communication circuit having both a contactless communication card function and a contactless communication reader/writer function, which includes a capacitor section that forms a parallel-resonant circuit with a contactless communication antenna; and a capacitance switching section that makes a capacitance of the capacitor section effective in a mode of the contactless communication card function, and reduces the capacitance of the capacitor section in a mode of the contactless communication reader/writer function.