Patents by Inventor Michael J. Sum

Michael J. Sum 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).

  • Aircraft propeller speed control
    Patent number: 4958289
    Abstract: The invention concerns a control for an aircraft propeller. During operation in reverse pitch, as occurs upon thrust reversal during a landing maneuver, the speed of the propeller is controlled by adjusting pitch of the propeller, in order to prevent overspeeding. Further, during the transition period while the propeller is converting from forward pitch to reverse pitch, the propeller presents a light load to the engine. At this time, fuel flow to the engine is limited in order to restrict delivery of energy to the propeller, again, for the purpose of preventing overspeeding.
    Type: Grant
    Filed: December 14, 1988
    Date of Patent: September 18, 1990
    Assignee: General Electric Company
    Inventors: Michael J. Sum, George W. Bennett, Steven A. Merrell, Neil Walker