Patents by Inventor William H. Learn

William H. Learn 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).

  • Projectable step for vehicles
    Patent number: 4231583
    Abstract: A step for a vehicle pivotally supported by the chassis frame thereof and movable between extended operative and retracted inoperative positions, vacuum mechanism being used to retract the step and a spring moves the same to extended position. A latch releasably secures the step in the extended position and the vacuum mechanism initially unlatches the latch prior to the vacuum moving the step to retracted position.
    Type: Grant
    Filed: May 31, 1979
    Date of Patent: November 4, 1980
    Inventor: William H. Learn