Patents by Inventor Ivan Daryl Chapman

Ivan Daryl Chapman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Fluid flow pulsing for increased stability in PEM fuel cell
    Patent number: 8778551
    Abstract: A fuel cell system includes a fuel cell stack and a flow control device that controls a supply of a first phase fluid flowing through the fuel cell stack. A controller monitors at least one parameter of the fuel cell stack and controls the supply to generate pulses of reactant when the at least one parameter crosses a threshold to flush a second phase fluid from said fuel cell stack.
    Type: Grant
    Filed: January 29, 2008
    Date of Patent: July 15, 2014
    Assignee: GM Global Technology Operations LLC
    Inventors: Ivan Daryl Chapman, Charles Mackintosh, Pinkhas A. Rapaport