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Richard D Maryyanek, Joseph Z Zdrok: Disposable respirator. American Optical Corporation, Pahl Lorusso & Loud, July 15, 1986: US04600002 (76 worldwide citation)

A multiple ply, fold-flat, disposable respirator having, as one ply, a layer of a toxic gas or vapor absorbing material. Another ply is an aerosol filter. The respirator has an inturned vertical seam covered with a strip of foamed elastomer.


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Richard D Maryyanek, Joseph Z Zdrok, Keith Simpson: Positive pressure test apparatus for facepiece respirator. Cabot Safety Corporation, Michelle B Lando, Harry J Gwinnell, April 5, 1994: US05299448 (54 worldwide citation)

A positive pressure test apparatus for fit testing a facepiece respirator having an exhalation valve, including a cover portion having a central bore with an inwardly directed shoulder at the base. A plunger is provided having a stem, a button portion on one end and a flange portion on the opposite ...


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Richard D Maryyanek, Joseph Z Zdrok: Respirator. American Optical Corporation, Pahl Lorusso & Loud, June 3, 1986: US04592350 (27 worldwide citation)

This invention relates to a dual reusable filter respirator system. The respirator can be worn in dust, mist and fume environments for very long periods of time, while providing increased visibility, safety and comfort for the respirator wearer. A significant feature of the respirator is a pair of t ...


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Joseph Z Zdrok: Test probe for face piece respirators. Cabot Safety Corporation, Michelle B Lando, December 20, 1994: US05373869 (10 worldwide citation)

A device for fit testing facepiece respirators is presented. In accordance with the present invention, a testing probe is installed in the facepiece of a respirator during fit testing. In a first embodiment, the probe of this invention is installed in the front or side port of the facepiece after th ...


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