TREA

Richard Arthur Wittren

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  • Cedar Falls, IA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Flow amplifying steering system
    • Patent number 4,640,094
    • Issue date Feb 3, 1987
    • Deere & Company
    • Richard A. Wittren
    • B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • Information Patent Grant

    Priority valve
    • Patent number 4,556,078
    • Issue date Dec 3, 1985
    • Deere & Company
    • Richard A. Wittren
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Priority valve
    • Patent number 4,541,451
    • Issue date Sep 17, 1985
    • Deere & Company
    • Richard A. Wittren
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Compensating valve
    • Patent number 4,463,775
    • Issue date Aug 7, 1984
    • Deere & Company
    • Richard A. Wittren
    • B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • Information Patent Grant

    Steering system and compensating valve
    • Patent number 4,405,030
    • Issue date Sep 20, 1983
    • Deere & Company
    • Richard A. Wittren
    • B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • Information Patent Grant

    Steering system
    • Patent number 4,367,803
    • Issue date Jan 11, 1983
    • Deere & Company
    • Richard A. Wittren
    • B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • Information Patent Grant

    Hydraulic system with unloading valve assembly
    • Patent number 4,209,984
    • Issue date Jul 1, 1980
    • Deere & Company
    • Carl E. Kittle
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Hydraulic system with unloading valve assembly
    • Patent number 4,170,113
    • Issue date Oct 9, 1979
    • Deere & Company
    • Carl E. Kittle
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Zero lap valve
    • Patent number 4,066,099
    • Issue date Jan 3, 1978
    • Deere & Company
    • Richard Arthur Wittren
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Forward, neutral and reverse V-belt planetary drive
    • Patent number 4,038,886
    • Issue date Aug 2, 1977
    • Deere & Company
    • Richard Arthur Wittren
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Demand compensated hydraulic system with pilot line pressure-mainta...
    • Patent number 3,995,425
    • Issue date Dec 7, 1976
    • Deere & Company
    • Richard Arthur Wittren
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Hydraulic cylinder with integral feedback cylinder
    • Patent number 3,986,438
    • Issue date Oct 19, 1976
    • Deere & Company
    • Richard Arthur Wittren
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL