TREA

Harlo W. Janzen

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  • Fairview, OK, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Handles for slips used on drilling rigs
    • Patent number 4,458,934
    • Issue date Jul 10, 1984
    • Kliewer; Larry D.
    • Harlo W. Janzen
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Power tongs
    • Patent number 4,445,403
    • Issue date May 1, 1984
    • Kliewer; Larry D.
    • Harlo W. Janzen
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Pipe thread protector device
    • Patent number 4,415,005
    • Issue date Nov 15, 1983
    • Harlo W. Janzen
    • B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
  • Information Patent Grant

    Pipe thread protector apparatus
    • Patent number 4,398,566
    • Issue date Aug 16, 1983
    • Harlo W. Janzen
    • B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL