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:
Aug. 06, 2002
Filed:
Oct. 22, 1999
Stephen A. Grot, Bear, DE (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An electrochemical fuel cell stack comprising an upper end plate assembly; a lower end plate assembly; at least one electrochemical fuel cell assembly interposed between the upper and lower end plate assemblies; and a clamp mechanism operative to compressively clamp the stack. A plurality of screws threaded through threaded bores in the upper end plate at spaced locations in the upper end plate and bearing at their lower ends on an upper face of a distributor plate are selectively tightened to provide a substantially uniform torque in each screw whereby to assure uniform compressive loading across the area of the distributor plate and thereby across the area of the fuel cell assembly.