Patents by Inventor Donald J. Tomasek

Donald J. Tomasek 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).

  • Multiple clutch control system
    Patent number: 4376473
    Abstract: A multiple clutch control system for controlling the operation of clutches in a multiple speed transmission of the type wherein the gear ratio of the transmission is operated by engaging one hydraulically operated clutch while simultaneously disengaging another hydraulically operated clutch includes circuitry responsive to the hydraulic pressure applied to the just engaged or on going clutch for preventing the disengagement of the other clutch until the hydraulic pressure applied to the just engaged clutch exceeds a predetermined level indicating that the just engaged clutch has engaged.
    Type: Grant
    Filed: March 26, 1981
    Date of Patent: March 15, 1983
    Assignee: International Harvester Co.
    Inventors: Donald J. Tomasek, Benjamin L. McCash