Patents by Inventor Mark C. Sellnau

Mark C. Sellnau 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).

  • Patent number: 5329809
    Abstract: A cylinder pressure sensor of the annular insert type disposed within an access well to measure the flexure of a first wall relative to a second wall along a response axis has low-cost components thereof requiring only simple sequential assembly in axial stacked fashion providing contaminant protection and electrical shielding of the sensing element.
    Type: Grant
    Filed: April 22, 1993
    Date of Patent: July 19, 1994
    Assignee: General Motors Corporation
    Inventors: Mark C. Sellnau, Robert G. Plyler, Andrew F. Rodondi
  • Patent number: 4969352
    Abstract: This invention is an annular sensor that measures combustion chamber pressure in an internal combustion engine. The sensor is located in an engine component opening, such as a spark plug well, and is engaged with first and second walls that define the ends of the opening. The first wall is located near the combustion chamber and flexes in response to varying combustion chamber pressure. The second wall is located away from the combustion chamber and remains relatively rigid. Movement of the first wall relative to the second wall due to varying combustion chamber pressure transmits a load to the sensor. The sensor generates an output signal that corresponds to that load which may subsequently be used to control engine functions.
    Type: Grant
    Filed: March 12, 1990
    Date of Patent: November 13, 1990
    Assignee: General Motors Corporation
    Inventor: Mark C. Sellnau