Patents by Inventor Raj Kantesaria

Raj Kantesaria 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).

  • Start jerk reduction for an elevator
    Patent number: 5635688
    Abstract: At the beginning of a run of an elevator 4, from an elevator control 14 a stiction removing velocity signal 20 is provided to a drive control 24 for commanding the elevator until stiction is broken; then as soon as the elevator 4 moves a normal dictated velocity signal 21 controls the elevator 4 throughout the remainder of the run. In further accordance with the present invention, the stiction removing velocity signal 20 is provided prior to the dictated velocity signal 21 only when the elevator 4 is operating in a regenerative mode, as determined by the elevator 4 moving in the up direction while lightly loaded or moving in the down direction while heavily loaded.
    Type: Grant
    Filed: October 31, 1994
    Date of Patent: June 3, 1997
    Assignee: Otis Elevator Company
    Inventors: Raj Kantesaria, Mark E. Shepard, Donald F. Cominelli