Patents by Inventor Don J. McAlpine

Don J. McAlpine 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).

  • Apparatus and method for clearing debris from cut trees
    Patent number: 4872565
    Abstract: A Christmas tree shaker including a base with a horizontal turntable mounted rotatably thereon on a motor driven shaft. A tree trunk receiving receptacle is mounted on the turntable for limited relative rotation with respect thereto. The receptacle is offset from the turntable axis of rotation. A stabilizer link between the base and receptacle limits the amount of relative rotation between the receptacle and turntable as the motor driven shaft rotates the turntable causing the receptacle to travel rapidly in a tight circle.
    Type: Grant
    Filed: February 12, 1988
    Date of Patent: October 10, 1989
    Inventor: Don J. McAlpine