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:
Oct. 13, 2009
Filed:
Jul. 23, 2004
Minoru Sugiyama, Tokyo, JP;
Minoru Sugiyama, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
In order for a backup battery to prolong a backup time period for a mobile instrument, a control signal Scbecomes either low or high in accordance with a determination that a power supply voltage Vm of a main battery is either lower or higher than a prescribed level Vrequiring backup from the backup battery. A control signal Scalso becomes either low or high in accordance with a determination that a backup voltage Vb of the backup battery is either higher or lower than a power supply voltage Vm supplied by a main battery. When both of the control signals Scand Scare in the high level, a control switch is turned ON so as to stop a current from flowing from the backup battery to the main battery. The control switch is otherwise turned OFF.