Patents by Inventor Roger E. Axmark

Roger E. Axmark 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).

  • Dual detector flame sensor
    Patent number: 4370557
    Abstract: In a multi-burner boiler or industrial furnace installation that uses pulverized coal for fuel and utilizes an oil pilot torch it has been difficult to sense and discriminate satisfactorily between safe and unsafe burner operation in these multi-burner arrangements. By using both a Si detector (visible light responsive) and a lead sulfide detector (infrared responsive) and selectively combining the signals therefrom, the best characteristics of both detectors are utilized to provide satisfactory flame sensing.
    Type: Grant
    Filed: August 27, 1980
    Date of Patent: January 25, 1983
    Assignee: Honeywell Inc.
    Inventors: Roger E. Axmark, Ernest A. Satren