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:
Apr. 27, 2010
Filed:
Aug. 03, 2005
Robert Schaefer, Darmstadt, DE;
Sebastian Lienkamp, Bundenheim, DE;
Robert Schaefer, Darmstadt, DE;
Sebastian Lienkamp, Bundenheim, DE;
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A fuel cell stack that includes cascaded stack stages and tube bundle flow restrictions for providing a cathode input gas to each stage in the stack. The stack includes a first flow pipe for providing cathode gas flow to a first stage of the plurality of stages of the fuel cell stack. The fuel cell stack also includes a second flow pipe that receives a cathode exhaust gas flow from the first stage and fresh cathode gas flow, where the cathode exhaust gas flow and the fresh cathode gas flow are combined and sent to a second stage of the plurality of stages of the fuel cell stack. The tube bundle flow restriction is positioned within the second flow pipe and controls the flow of the cathode gas flow to the second stage, where the flow restriction provides a laminar flow through the control valve to the second stage.