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:
Jul. 02, 1996
Filed:
Apr. 29, 1994
Applicant:
Inventor:
Harry W Moore, III, Watkins Glen, NY (US);
Assignee:
Mitel, Inc., Reston, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02J / ;
U.S. Cl.
CPC ...
327545 ; 320-5 ; 320-9 ; 365229 ; 307 66 ;
Abstract
A charging circuit for a random access memory (RAM) backup battery for supplying a first charge current from a voltage supply to the battery for as long as the voltage supply is present, comprised of a first resistance apparatus for limiting the first charge current to a low predetermined value, a bypass conducting switch connected in parallel with the first resistance apparatus, and apparatus for detecting a low voltage condition of the voltage supply and for enabling operation of the bypass conducting switch thereby bypassing the first resistance apparatus and allowing discharge current to flow from the battery to the RAM.