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. 20, 2001
Filed:
Jan. 05, 1994
Lawrence M. Green, Lindenhurst, IL (US);
Richard L. Hammon, Hanover Park, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method eliminates the discharge of the backup battery (,) prior to the primary source of power initially being applied to the device. The method comprises detecting the application of a source of primary power (,) and providing a path by way of a switch (,) in response to receiving the power (,), wherein the path allows the backup battery to power the device. Also, a circuit for maintaining the charge in a backup battery (,) of a device before primary power is applied comprises a sensing circuit (,) for generating an activation signal after initially sensing the application of the primary power to the device, and a switch element (,) coupled the sensing circuit (,) to receive the activation signal. The switch element (,) provides a path for the backup battery (,) to power the device. Accordingly, the method and circuit allow manufacturers of devices incorporating a backup battery (,) to install the backup battery (,) prior to shipping and eliminate the requirement for the purchaser of the device to install the backup battery (,).