Patents by Inventor Christopher D. Sierra

Christopher D. Sierra 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 engine propeller overspeed protection technical field
    Patent number: 5019006
    Abstract: An aircraft engine propeller autofeather system (4) has a feather solenoid (8) which is actuated by either a signal provided by an engine power loss detector (10) or a signal provided by an engine overspeed detector (12). The overspeed detector (12) detects excessive propeller speed by comparing the speed to a first predetermined value (21) or by comparing the speed rate of change to a second predetermined value (23) combined with comparing the speed to a third predetermined value (25).
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: May 28, 1991
    Inventors: Roy W. Schneider, Christopher D. Sierra