Patents by Inventor Ralph S. Hajek

Ralph S. Hajek 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).

  • Automatic control of lockable differentials
    Patent number: 4070924
    Abstract: A pilot source of fluid pressure allows the engagement of a lockable differential into a locked mode in response to a pressure signal directed to it. Metering of the signal is related to the operating condition of the implements being carried by the vehicle regardless of operator initiation of the differential locking control.
    Type: Grant
    Filed: May 21, 1976
    Date of Patent: January 31, 1978
    Assignee: International Harvester Company
    Inventors: Emil F. Moreno, Ralph S. Hajek, Julius F. Marquardt
  • Engine exhaust diverter valve
    Patent number: 3994530
    Abstract: Valve mechanism allows exhaust gas flow to be directed to either a dump body heating system or an exhaust pipe depending on the proximity of the dump body heating system.
    Type: Grant
    Filed: December 8, 1975
    Date of Patent: November 30, 1976
    Assignee: International Harvester Company
    Inventors: George Zaborsky, Ralph S. Hajek