TREA

John A. Hoffman

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  • Brighton, MI, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Recreational vehicle toilet with flush nozzle deflector shield
    • Patent number 5,875,499
    • Issue date Mar 2, 1999
    • Thetford Corporation
    • John A. Hoffman
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Portable waste holding tank with improved inlet valve assembly
    • Patent number 5,318,275
    • Issue date Jun 7, 1994
    • Thetford Corporation
    • Charles L. Sargent
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Portable toilet holding tank spout
    • Patent number 4,769,860
    • Issue date Sep 13, 1988
    • Thetford Corporation
    • Charles L. Sargent
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Portable toilet holding tank spout
    • Patent number 4,641,383
    • Issue date Feb 10, 1987
    • Thetford Corporation
    • Charles L. Sargent
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Portable toilet
    • Patent number D262051
    • Issue date Nov 24, 1981
    • Thetford Corporation
    • Charles L. Sargent
    • D23 - Environmental heating and cooling
  • Information Patent Grant

    Toilet
    • Patent number D257385
    • Issue date Oct 14, 1980
    • Thetford Corporation
    • Frank T. Sargent
    • D23 - Environmental heating and cooling
  • Information Patent Grant

    Portable toilet
    • Patent number 4,217,668
    • Issue date Aug 19, 1980
    • Thetford Corporation
    • Charles L. Sargent
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Portable toilets
    • Patent number 4,180,876
    • Issue date Jan 1, 1980
    • Thetford Corporation
    • Frank T. Sargent
    • E03 - WATER SUPPLY SEWERAGE