Wolfer; Dale R.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Wolfer; Dale R..The latest application filed is for "foot valve assembly for a down hole drill".
- Wolfer; Dale R. - Salem VA US
| Patent | Date |
|---|---|
| Foot valve assembly for a down hole drill Grant 8,561,730 - Yao , et al. October 22, 2 | 2013-10-22 |
| Variable frequency control for down hole drill and method Grant 8,215,419 - Plunkett , et al. July 10, 2 | 2012-07-10 |
| Foot Valve Assembly For A Down Hole Drill App 20110232922 - Yao; Jing James ; et al. | 2011-09-29 |
| Exhaust valve and bit assembly for down-hole percussive drills Grant 7,832,504 - Wolfer , et al. November 16, 2 | 2010-11-16 |
| Variable Frequency Control For Down Hole Drill App 20100282509 - Plunkett; Timothy J. ; et al. | 2010-11-11 |
| Exhaust valve and bit assembly for down-hole percussive drills App 20090308661 - Wolfer; Dale R. ; et al. | 2009-12-17 |
| Self-lubricating, fluid-actuated, percussive down-the-hole drill Grant 5,711,205 - Wolfer , et al. January 27, 1 | 1998-01-27 |
| Reversible casing for a self-lubricating, fluid-actuated, percussive down-the-hole drill Grant 5,566,771 - Wolfer , et al. October 22, 1 | 1996-10-22 |
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