Patents by Inventor Mark D. Humphries

Mark D. Humphries 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).

  • Gas fired heater
    Patent number: D316749
    Type: Grant
    Filed: October 14, 1988
    Date of Patent: May 7, 1991
    Assignee: Valor Heating Limited
    Inventors: Mark D. Humphries, Paul A. Gillam
  • Gas fired heater
    Patent number: D317499
    Type: Grant
    Filed: October 17, 1988
    Date of Patent: June 11, 1991
    Assignee: Valor Heating Limited
    Inventors: Jeffery R. Tonks, Mark D. Humphries, Paul A. Gillam