Kotch; Robert J.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Kotch; Robert J..The latest application filed is for "pressure compensator for drill bit lubrication system".
- Kotch; Robert J. - Kingwood TX
- Kotch; Robert J. - Humble TX
| Patent | Date |
|---|---|
| Pressure compensator for drill bit lubrication system Grant 5,072,795 - Delgado , et al. December 17, 1 | 1991-12-17 |
| Seal assembly for rotary drill bits Grant 4,838,365 - Kotch June 13, 1 | 1989-06-13 |
| Roller cutter drill bit having a texturized seal member Grant 4,619,534 - Daly , et al. October 28, 1 | 1986-10-28 |
| Compound dynamic seal for rolling cutter drill bit Grant 4,466,622 - Deane , et al. August 21, 1 | 1984-08-21 |
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