TREA

Kermit W. Janssen

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  • Valley Forge, PA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Well screen
    • Patent number 4,550,778
    • Issue date Nov 5, 1985
    • CertainTeed Corporation
    • Dale W. Sullivan
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Molded fittings
    • Patent number 4,352,512
    • Issue date Oct 5, 1982
    • Certain-teed Corporation
    • Kermit W. Janssen
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Method of making a well screen
    • Patent number 4,310,372
    • Issue date Jan 12, 1982
    • Certain-teed Corporation
    • Kermit W. Janssen
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Molded fittings and methods of manufacture
    • Patent number 4,262,744
    • Issue date Apr 21, 1981
    • Certain-teed Corporation
    • Andrew Mitchell
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL