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Helmut Landgraf

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  • Duisburg-Rumeln-Kaldenhausen, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method and device for jacketing a steel pipe with several plastic m...
    • Patent number 4,519,863
    • Issue date May 28, 1985
    • Mannesmann Aktiengesellschaft
    • Helmut Landgraf
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Wrapping steel pipes in a thermoplastic ribbon
    • Patent number 4,501,632
    • Issue date Feb 26, 1985
    • Mannesmann AG
    • Helmut Landgraf
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Apparatus for the jacketing of steel pipes
    • Patent number 4,386,996
    • Issue date Jun 7, 1983
    • Mannesmann Aktiengesellschaft
    • Helmut Landgraf
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Roller track for pipes
    • Patent number 4,184,839
    • Issue date Jan 22, 1980
    • Mannesmann Aktiengesellschaft
    • Helmut Landgraf
    • C21 - METALLURGY OF IRON
  • Information Patent Grant

    Cooled mandrel
    • Patent number 4,173,880
    • Issue date Nov 13, 1979
    • Mannesmann Aktiengesellschaft
    • Helmut Landgraf
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...