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. 23, 2004
Filed:
Mar. 20, 2002
Patrick L. Hagans, Columbia, CT (US);
Gennady Resnick, South Windsor, CT (US);
UTC Fuel Cells, LLC, South Windsor, CT (US);
Abstract
Recovery of PEM fuel cell performance is achieved by evacuating ( ) or by flowing water absorbing gas ( ) through, or both, the fuel flow field ( ), the air flow field ( ), and the water flow field ( ), while resistance of the individual cells, or of the fuel cell stack, is measured; the dry out process is continued until the resistance of the cells (or the resistance per cell, measured across the fuel cell stack as a whole), has increased by at least 5 to 1 (preferably 10 to 1) over the normal resistance of the cells. The water absorbing gas may be air ( ) or nitrogen ( ); it may be at ambient temperature or heated ( ).