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:
Jun. 18, 2002
Filed:
Nov. 09, 1999
Applicant:
Inventors:
Donald H. Keskula, Webster, NY (US);
Bruce J. Clingerman, Palmyra, NY (US);
Robert W. Chalfant, West Henrietta, NY (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01M 8/04 ;
U.S. Cl.
CPC ...
H01M 8/04 ;
Abstract
In an improved method, the voltage of one or more cells in a fuel cell stack is monitored. The monitored voltage is compared to first and second preselected voltage values as a function of load, where the second preselected value is less than the first preselected value. Next, either a first signal is generated if the monitored voltage is less than the first preselected voltage value and greater than or equal to the second preselected voltage value; or a second signal is generated if the monitored voltage is less than the second preselected voltage value.