Patents by Inventor Francois Ronsin

Francois Ronsin 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).

  • Elevator motor control system for A.C. induction motor
    Patent number: 4068741
    Abstract: An alternating current induction motor control system suitable to employ the motor as a hoisting motor for an elevator. The motor includes a high speed winding and a low speed winding, the high speed winding being used for acceleration and the low speed winding for deceleration. The low speed winding is connected in such a way as to rotate the motor in a direction opposite to that in which the high speed winding rotated it. A motion detector is provided to prevent the elevator from moving in the opposite direction after being brought to a stop at a landing.
    Type: Grant
    Filed: February 19, 1976
    Date of Patent: January 17, 1978
    Assignee: United Technologies Corporation
    Inventors: Rene Ficheux, Francois Ronsin