Patents by Inventor David R. Fredericks

David R. Fredericks 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).

  • Heated solid electrolyte oxygen sensor
    Patent number: 4169778
    Abstract: A readily manufacturable heated solid electrolyte oxygen sensor having an elongated heater supported in subassembly with a tubular terminal for a reference electrode of the sensor. The heater is coaxial with the electrode terminal for predetermined disposition with respect to the sensor solid electrolyte member. The heater includes a rod coaxially in a ceramic tube and a resistance heating coil and crimped outer connector around the ceramic tube. Fused glass, directly bonded to the ceramic tube, supports the heater in the electrode terminal.
    Type: Grant
    Filed: November 16, 1978
    Date of Patent: October 2, 1979
    Assignee: General Motors Corporation
    Inventors: Gamdur S. Mann, Michael P. Murphy, David R. Fredericks, Kenneth R. Deming