Patents by Inventor John C. Rohde

John C. Rohde 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).

  • Acceleration control system for a d-c motor
    Patent number: 3931555
    Abstract: A digital pulse source generates a frequency analog of a desired velocity to which a d-c motor is accelerated. The acceleration circuit comprises a circuit means for converting a frequency analog signal to a frequency dependent direct voltage and a sawtooth voltage. A comparison circuit generates a motor drive signal having a duty cycle dependent on the relative voltage levels of the direct and sawtooth voltages. The comparative duty cycle of motor drive signal for two different velocities is regulated to be proportional to the square of the ratio of the two velocities.
    Type: Grant
    Filed: May 20, 1974
    Date of Patent: January 6, 1976
    Assignee: International Business Machines Corporation
    Inventors: George J. Dohanich, Jr., John C. Rohde, Gary A. Trudgen