Patents by Inventor Keith L. Carmichael

Keith L. Carmichael 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).

  • Control system for mechanically adjustable speed motor drives
    Patent number: 4976186
    Abstract: A control system for mechanically adjustable motor drives which have a shiftable speed control for controlling the speed of the drive. The system includes a double acting pneumatic cylinder which is remotely controlled to shift the speed control by varying the air pressure in the double acting cylinder, to increase or to decrease the speed of the motor drive. The air pressure can be varied manually or by automatic control means.
    Type: Grant
    Filed: December 20, 1988
    Date of Patent: December 11, 1990
    Assignee: Reliance Electric Company
    Inventors: Keith L. Carmichael, James F. Runyan