Parkin; Derek A.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Parkin; Derek A..The latest application filed is for "respirator flow control apparatus and method".
- Parkin; Derek A. - Newton Aycliffe GB
- Parkin; Derek A. - Durham GB
- Parkin; Derek A. - County Durham GB
| Patent | Date |
|---|---|
| Respirator Flow Control Apparatus And Method App 20210387028 - Walker; Garry J. ; et al. | 2021-12-16 |
| Respirator flow control apparatus and method Grant 11,130,008 - Walker , et al. September 28, 2 | 2021-09-28 |
| Respirator Flow Control Apparatus And Method App 20190083822 - Walker; Garry J. ; et al. | 2019-03-21 |
| Respirator flow control apparatus and method Grant 10,137,320 - Walker , et al. November 27, 2 | 2018-11-27 |
| Respirator Flow Control Apparatus And Method App 20150083134 - Walker; Garry J. ; et al. | 2015-03-26 |
| Supplied Air Respirator That Has An Adjustable Length Hose App 20130228183 - Walker; Garry ; et al. | 2013-09-05 |
| Respirator Flow Control Apparatus And Method App 20100108067 - Walker; Garry J. ; et al. | 2010-05-06 |
| Exhalation valve filter Grant D575,390 - Scott , et al. August 19, 2 | 2008-08-19 |
| Frame that supports an exhalation valve filter Grant D550,837 - Parkin , et al. September 11, 2 | 2007-09-11 |
| Supplied air respirator that has an adjustable length hose App 20060231100 - Walker; Garry J. ; et al. | 2006-10-19 |
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