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:
Jan. 11, 1994
Filed:
Feb. 03, 1992
Applicant:
Inventors:
Richard Haynes, East Windsor, NJ (US);
Robert B Levy, Morrisville, PA (US);
Assignee:
AT&T Bell Laboratories, Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; H02J / ;
U.S. Cl.
CPC ...
324427 ; 324426 ; 320 48 ; 340636 ;
Abstract
The state of charge of a rechargeable battery (12), such as those made from lithium, nickel-cadmium or metal hydrides, can be accurately determined by monitoring the rate of change of battery voltage over time (dv/dt), which parameter has empirically been found to change dramatically as the battery reaches complete discharge.