Patents by Inventor Donald L. Bianchetta

Donald L. Bianchetta 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).

  • Patent number: 3987623
    Abstract: An improved fluid system of a crawler type vehicle has control means for selectively passing fluid in a preselected sequence to a plurality of work elements.
    Type: Grant
    Filed: January 23, 1976
    Date of Patent: October 26, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Donald L. Bianchetta
  • Patent number: 3982469
    Abstract: A fluid system of a vehicle has means for reducing waste by separately controlling the maximum operating pressure of separate portions of the fluid system serving work elements of the vehicle.
    Type: Grant
    Filed: January 23, 1976
    Date of Patent: September 28, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Donald L. Bianchetta
  • Patent number: 3967640
    Abstract: A hydraulic control valve body is pre-cored for selective adaptation to provide a first valve assembly having two independent circuits or a second valve assembly having a single circuit with either a series-parallel or interrupted series function.
    Type: Grant
    Filed: January 31, 1975
    Date of Patent: July 6, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Donald L. Bianchetta
  • Patent number: 3943825
    Abstract: A load supporting hydraulic system having a pilot operated main control valve is provided with pilot controlled load check valve operative to permit free flow of fluid from said control valve toward the load supporting means of the system in response to pilot pressure and to block fluid flow from the load supporting means toward the control valve. The system includes valve means operative independent of the main control valve to permit the load check valve to be opened by fluid pressure in the load supporting means to allow fluid flow therefrom to the reservoir. The system further includes safety valve means for blocking fluid flow to pilot control means.
    Type: Grant
    Filed: October 26, 1973
    Date of Patent: March 16, 1976
    Assignee: Caterpillar Tractor Co.
    Inventors: Donald L. Bianchetta, Kenneth R. Lohbauer, Sammy J. Rhodes