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:
Aug. 05, 2003
Filed:
Mar. 28, 2002
Kevin Dotzler, San Diego, CA (US);
Glenn Garbeil, Carlsbad, CA (US);
Denso Corporation, Kariya, JP;
Abstract
A real-time clock circuit for saving real time information during removal of a battery is presented. The battery provides power to the clock circuit during a steady-state mode. The clock circuit includes an oscillator assembly for generating a periodic waveform. A counter accumulates real time information in response to the periodic waveform. An energy storage device is coupled to the counter to supply energy to the counter while the battery is removed. A switch is coupled between the battery and the energy storage device to prevent the energy storage device from supplying energy to components other than the counter during removal of the battery. The switch provides a path for energy to flow from the battery to the energy storage device, thereby charging the energy storage device.