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:
Nov. 01, 2005
Filed:
Jul. 25, 2001
Russell Howard Barton, New Westminister, CA;
Tan Duc Uong, Coquitlam, CA;
Charles Joseph Schembri, Langley, CA;
George Alexander Skinner, Burnaby, CA;
Russell Howard Barton, New Westminister, CA;
Tan Duc Uong, Coquitlam, CA;
Charles Joseph Schembri, Langley, CA;
George Alexander Skinner, Burnaby, CA;
Ballard Power Systems Inc., Burnaby, CA;
Abstract
A purge system for fuel cell stack includes a purge valve to regulate exhaust from the fuel cell stack in response control signals from a controller in response to a voltage across a purge cell portion of a fuel cell stack. The purge valve is opened when the voltage across the purge cell portion falls below a defined percentage of a threshold voltage. The threshold voltage can be equal to an average cell voltage of some or all of the fuel cells of the fuel cell stack. The purge may include one or more successive openings of the purge valve of controlled purge durations.