TREA

Willem C. DEN Hertog

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  • Zwolle, NL
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Patents Grantslast 30 patents

  • Information Patent Grant

    Tube of thermoplastics with thickened end
    • Patent number 4,150,087
    • Issue date Apr 17, 1979
    • Wavin B.V.
    • Warner J. de Putter
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Device for forming tube with thickened socket end
    • Patent number 4,131,407
    • Issue date Dec 26, 1978
    • Wavin B.V.
    • Warner J. de Putter
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Extruder with hydrostatic bearing
    • Patent number 3,945,621
    • Issue date Mar 23, 1976
    • Wavin B.V.
    • Willem Cornelis den Hertog
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL