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Duane D. Robertson

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  • Golden, CO, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Combined clamping and cutting tool for plastic pipes
    • Patent number 6,810,587
    • Issue date Nov 2, 2004
    • Duane D. Robertson
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Spring-biased cutting tool for plastic pipes
    • Patent number 6,370,780
    • Issue date Apr 16, 2002
    • Duane D. Robertson
    • B26 - HAND CUTTING TOOLS CUTTING SEVERING
  • Information Patent Grant

    Replacement fitting for rigid, plastic pipes
    • Patent number 6,318,761
    • Issue date Nov 20, 2001
    • Duane D. Robertson
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Pipe fitting
    • Patent number 5,487,571
    • Issue date Jan 30, 1996
    • Duane D. Robertson
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Cutting tool
    • Patent number 4,956,916
    • Issue date Sep 18, 1990
    • Duane D. Robertson
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Pipe saddle
    • Patent number 4,789,189
    • Issue date Dec 6, 1988
    • Duane D. Robertson
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Cutting tool for flexible plastic conduit
    • Patent number 4,336,652
    • Issue date Jun 29, 1982
    • Duane D. Robertson
    • B26 - HAND CUTTING TOOLS CUTTING SEVERING
  • Information Patent Grant

    Fitting for flexible plastic pipe
    • Patent number 3,980,325
    • Issue date Sep 14, 1976
    • Robertson; Duane D.
    • Duane D. Robertson
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...

Patents Applicationslast 30 patents