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Richard J. Duffy

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  • Salem, MA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Locking patch machine
    • Patent number 4,366,190
    • Issue date Dec 28, 1982
    • Philip J. Rodden
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Method of making self-locking fasteners
    • Patent number 4,120,993
    • Issue date Oct 17, 1978
    • USM Corporation
    • Richard Joseph Duffy
    • B05 - SPRAYING OR ATOMISING IN GENERAL APPLYING LIQUIDS OR OTHER FLUENT MATER...
  • Information Patent Grant

    Apparatus for making locking nuts
    • Patent number 4,100,882
    • Issue date Jul 18, 1978
    • USM Corporation
    • Richard J. Duffy
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Method of making locking nuts
    • Patent number 4,054,688
    • Issue date Oct 18, 1977
    • USM Corporation
    • Richard J. Duffy
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Method for the manufacture of fasteners
    • Patent number 3,995,074
    • Issue date Nov 30, 1976
    • USM Corporation
    • Richard J. Duffy
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR