Patents by Inventor Steven E. Houlberg

Steven E. Houlberg 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).

  • Fuel cell stack with passive end cell heater
    Patent number: 7160640
    Abstract: A fuel cell system comprising a passive end cell heater for heating an end cell or cells within a fuel cell stack is disclosed. The fuel cell system comprises a fuel cell stack and a resistive heatable element connected in parallel to the fuel cell stack, wherein the resistive heatable element is adapted to heat an end cell of the fuel cell stack. A method for heating an end cell in a fuel cell stack is also disclosed.
    Type: Grant
    Filed: January 15, 2003
    Date of Patent: January 9, 2007
    Assignee: Ballard Power Systems Inc.
    Inventor: Steven E. Houlberg
  • Fuel cell stack with passive end cell heater
    Publication number: 20040137295
    Abstract: A fuel cell system comprising a passive end cell heater for heating an end cell or cells within a fuel cell stack is disclosed. The fuel cell system comprises a fuel cell stack and a resistive heatable element connected in parallel to the fuel cell stack, wherein the resistive heatable element is adapted to heat an end cell of the fuel cell stack. A method for heating an end cell in a fuel cell stack is also disclosed.
    Type: Application
    Filed: January 15, 2003
    Publication date: July 15, 2004
    Applicant: Ballard Power Systems, Inc.
    Inventor: Steven E. Houlberg