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:
Jan. 10, 2012
Filed:
Jun. 27, 2008
Applicant:
Tsutomu Nishikawa, Chigasaki, JP;
Inventor:
Tsutomu Nishikawa, Chigasaki, JP;
Assignee:
Canon Kabushiki Kaisha, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01M 10/46 (2006.01);
U.S. Cl.
CPC ...
Abstract
A charging device which is capable of preventing charging current from flowing even if a battery pack remains mounted thereon after charging of the battery pack is completed, thereby preventing deterioration of batteries of the battery pack. A circuit including a semiconductor switch generates a DC power for charging the battery pack. A backflow prevention diode is connected between the semiconductor switch and the battery pack. When charging of the battery pack has been completed, a secondary charge control circuit causes a DC voltage input to the backflow prevention diode to be made lower than the voltage of the battery pack.