Patents by Inventor Michael Leo Duhaime

Michael Leo Duhaime 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).

  • Self-diagnosing pressure regulator apparatus
    Patent number: 6382248
    Abstract: An improved and self-diagnosing shift pressure regulator apparatus for an automatic shift transmission provides a diagnostic output that reliably and timely detects initiation and cessation of fluid supply to a friction element. The regulator apparatus includes a pressure regulator valve responsive to an electronically developed pilot pressure, and a diagnostic switch. The pilot pressure positions the pressure regulator valve in one of three states—ON, TRIM, and OFF—and the diagnostic switch is continuously activated by a control pressure whenever the pressure regulator valve is in the TRIM or ON states.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: May 7, 2002
    Assignee: General Motors Corporation
    Inventors: Charles Francis Long, Michael Leo Duhaime, Martin Robert Dadel