Patents by Inventor Ray Ackerman

Ray Ackerman 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).

  • Stair elevator
    Patent number: 4043427
    Abstract: A stair elevator including a chair and associated track adapted for support on a stairway, and further including special limit and emergency switches for controlling movement of the chair along the track. An improved braking device is also provided, as well as a unique low voltage control arrangement, an electrical interlock feature, and a re-set feature.
    Type: Grant
    Filed: March 19, 1976
    Date of Patent: August 23, 1977
    Inventor: Ray Ackerman