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Richard D. Maryyanek

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  • Northbridge, MA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Positive pressure test apparatus for facepiece respirator
    • Patent number 5,299,448
    • Issue date Apr 5, 1994
    • Cabot Safety Corporation
    • Richard D. Maryyanek
    • A62 - LIFE-SAVING FIRE-FIGHTING
  • Information Patent Grant

    Filter element
    • Patent number 4,921,512
    • Issue date May 1, 1990
    • American Optical Corporation
    • Richard D. Maryyanek
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Dual filter respirator
    • Patent number D286213
    • Issue date Oct 14, 1986
    • Richard D. Maryyanek
    • D29 - Equipment for safety, protection, and rescue
  • Information Patent Grant

    Disposable respirator
    • Patent number 4,600,002
    • Issue date Jul 15, 1986
    • American Optical Corporation
    • Richard D. Maryyanek
    • A41 - WEARING APPAREL
  • Information Patent Grant

    Respirator
    • Patent number 4,592,350
    • Issue date Jun 3, 1986
    • American Optical Corporation
    • Richard D. Maryyanek
    • A62 - LIFE-SAVING FIRE-FIGHTING
  • Information Patent Grant

    Respirator
    • Patent number D270957
    • Issue date Oct 11, 1983
    • American Optical Corporation
    • Richard D. Maryyanek
    • D29 - Equipment for safety, protection, and rescue