Patents Assigned to Caterpillar Tractor Company
  • Priority flow control system
    Patent number: 4437307
    Abstract: A priority flow control system in which the priority feature is obtained by progressively lowering the pressure differential of nonpriority valves, once the maximum pump output is reached, so that all of the system valves always retain their compensated proportional flow feature.
    Type: Grant
    Filed: March 11, 1982
    Date of Patent: March 20, 1984
    Assignee: Caterpillar Tractor Company
    Inventor: Tadeusz Budzich
  • Dual input pressure compensated fluid control valve
    Patent number: 4437388
    Abstract: A dual input direction flow control valve responsive to a manual or an electrical control signal for control of positive and negative loads operated by a single pilot valve stage, which automatically maintains a relatively constant pressure differential across valve spool, while controlling positive and negative loads and which permits variation in the level of pressure differential in response to a pulse type control signal, while this pressure differential is maintained constant at each controlled level.
    Type: Grant
    Filed: August 20, 1981
    Date of Patent: March 20, 1984
    Assignee: Caterpillar Tractor Company
    Inventor: Tadeusz Budzich
  • Dual input pressure compensated fluid control valve
    Patent number: 4436020
    Abstract: A fully compensated direction flow control valve for control of positive and negative loads provided with a direction control and flow metering spool and a control which varies the level of the pressure differential controlled across the metering section of the spool in respect to the displacement of the spool from its neutral position.
    Type: Grant
    Filed: March 11, 1982
    Date of Patent: March 13, 1984
    Assignee: Caterpillar Tractor Company
    Inventor: Tadeusz Budzich
  • Pressure compensated fluid control valve with maximum flow adjustment
    Patent number: 4436115
    Abstract: A direction flow control valve responsive to a manual control signal for control of positive and negative loads operated by a single pilot valve stage, which automatically maintains a relatively constant pressure differential across valve spool, while controlling positive and negative loads and which permits independent adjustment in maximum flow level through the valve for positive and negative load control.
    Type: Grant
    Filed: March 11, 1982
    Date of Patent: March 13, 1984
    Assignee: Caterpillar Tractor Company
    Inventor: Tadeusz Budzich
  • Pressure compensated fluid control valve
    Patent number: 4436019
    Abstract: A direction flow control valve for control of positive and negative loads operated by a single pilot valve stage, which automatically maintains a relatively constant pressure differential across valve spool, while controlling positive and negative loads and which permits variation in the level of pressure differential in response to an external control signal, while this pressure differential is maintained constant at each controlled level.
    Type: Grant
    Filed: August 20, 1981
    Date of Patent: March 13, 1984
    Assignee: Caterpillar Tractor Company
    Inventor: Tadeusz Budzich
  • Method and apparatus for vacuum evacuation and pressure fillings of sealed pin joints
    Patent number: 4051920
    Abstract: An apparatus and method for vacuum evacuation and pressure filling of a lubricant reservoir are provided which includes a sequence timing and shutoff mechanism for controlling evacuation, testing for air leaks, and filling with lubricant. Visual indication of mechanism performance is provided. A charging gun is adapted for sealingly mating with an opening in the reservoir. Alternatively, a pointed probe utilizable with stoppers of the conventional as well as vented type may be used.
    Type: Grant
    Filed: March 19, 1973
    Date of Patent: October 4, 1977
    Assignee: Caterpillar Tractor Company
    Inventor: Harold L. Reinsma