Joseph Z. Zdrok

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Webster, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Face mask and retainer
- Patent number 5,794,617
- Issue date Aug 18, 1998
- Louis M. Gerson Co., Inc.
- Robert Brunell
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Grant
Test probe for face piece respirators
- Patent number 5,373,869
- Issue date Dec 20, 1994
- Cabot Safety Corporation
- Joseph Z. Zdrok
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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
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