TREA

David E. Steffen

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  • Chatham, IL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Apparatus and method for sensing material build-up
    • Patent number 5,819,512
    • Issue date Oct 13, 1998
    • Dickey-john Corporation
    • Ronald E. Steffen
    • A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
  • Information Patent Grant

    High rate seed sensor
    • Patent number 4,555,624
    • Issue date Nov 26, 1985
    • Dickey-john Corporation
    • David E. Steffen
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Corn and soybean sensor
    • Patent number 4,307,390
    • Issue date Dec 22, 1981
    • Dickey-john Corporation
    • David E. Steffen
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Planter population monitor
    • Patent number 4,277,833
    • Issue date Jul 7, 1981
    • Dickey-john Corporation
    • David E. Steffen
    • A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
  • Information Patent Grant

    Electronic disabling switch
    • Patent number 4,262,288
    • Issue date Apr 14, 1981
    • Dickey-john Corporation
    • Robert C. Lanphier
    • A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
  • Information Patent Grant

    Planter population monitor
    • Patent number 4,225,930
    • Issue date Sep 30, 1980
    • Dickey-john Corporation
    • David E. Steffen
    • A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
  • Information Patent Grant

    Seed sensor
    • Patent number 4,166,948
    • Issue date Sep 4, 1979
    • Dickey-john Corporation
    • David E. Steffen
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Calibrated tuneable monitor
    • Patent number 4,137,529
    • Issue date Jan 30, 1979
    • Dickey-john Corporation
    • James H. Anson
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Automatically controlled seed planter
    • Patent number 4,085,862
    • Issue date Apr 25, 1978
    • Dickey-john Corporation
    • David Eugene Steffen
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Solid state seed sensor
    • Patent number 3,974,377
    • Issue date Aug 10, 1976
    • Dickey-john Corporation
    • David E. Steffen
    • G01 - MEASURING TESTING