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. 04, 1997
Filed:
Nov. 25, 1991
Applicant:
Inventor:
Donald M Bartlett, Fort Collins, CO (US);
Assignees:
AT&T Global Information Solutions Company, Dayton, OH (US);
Hyundai Electronics America, San Jose, CA (US);
Symbios Logic Inc., Fort Collins, CO (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H02J / ;
U.S. Cl.
CPC ...
307 64 ; 307 66 ; 307 72 ;
Abstract
The invention concerns battery back-up for electronic equipment. A sensor detects a drop in power supply voltage and, in response, connects the back-up battery to the equipment, via a Field-Effect Transistor (FET). The FET causes a lower voltage drop between the battery and the equipment, as compared with a commonly used alternative, namely, a diode.