Zdrok; Joseph Z.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Zdrok; Joseph Z..The latest application filed is for "test probe for face piece respirators".
- Zdrok; Joseph Z. - Webster MA
| Patent | Date |
|---|---|
| Test probe for face piece respirators Grant 5,373,869 - Zdrok December 20, 1 | 1994-12-20 |
| Positive pressure test apparatus for facepiece respirator Grant 5,299,448 - Maryyanek , et al. April 5, 1 | 1994-04-05 |
| Test probe for facepiece respirators Grant D340,316 - Zdrok October 12, 1 | 1993-10-12 |
| Disposable respirator Grant D287,649 - Zdrok , et al. January 6, 1 | 1987-01-06 |
| Dual filter respirator Grant D286,213 - Maryyanek , et al. October 14, 1 | 1986-10-14 |
| Disposable respirator Grant 4,600,002 - Maryyanek , et al. July 15, 1 | 1986-07-15 |
| Respirator Grant 4,592,350 - Maryyanek , et al. June 3, 1 | 1986-06-03 |
| Respirator Grant D270,957 - Maryyanek , et al. October 11, 1 | 1983-10-11 |
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