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. 31, 2012
Filed:
Oct. 20, 2006
Michael K. Budinski, Pittsford, NY (US);
Craig S. Gittleman, Rochester, NY (US);
Yeh-hung Lai, Webster, NY (US);
Christopher Lewis, Rochester, NY (US);
Daniel Miller, Victor, NY (US);
Michael K. Budinski, Pittsford, NY (US);
Craig S. Gittleman, Rochester, NY (US);
Yeh-Hung Lai, Webster, NY (US);
Christopher Lewis, Rochester, NY (US);
Daniel Miller, Victor, NY (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
One aspect of the invention includes the discovery that pinholes in the membrane of the membrane electrode assembly may be caused by hygroexpansive ratcheting. In one embodiment of the invention, a fuel cell stack including a plurality of cells each having a membrane electrode assembly each including a membrane manufactured by an extrusion method and operated so that the rate of drying during humidity cycling is sufficiently low to reduce or eliminate build up stresses in the membrane electrode assembly.