Schumacher; Percy W.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Schumacher; Percy W..The latest application filed is for "seal assembly for roller cutter drill bit having a pressure balanced lubrication system".
- Schumacher; Percy W. - Houston TX
| Patent | Date |
|---|---|
| Seal assembly for roller cutter drill bit having a pressure balanced lubrication system Grant 5,080,183 - Schumacher , et al. * January 14, 1 | 1992-01-14 |
| Cutting elements for roller cutter drill bits Grant 4,940,099 - Deane , et al. July 10, 1 | 1990-07-10 |
| Rotary drill bit having improved mounting means for multiple cutting elements Grant 4,907,662 - Deane , et al. * March 13, 1 | 1990-03-13 |
| Mounting means for cutting elements in drag type rotary drill bit Grant 4,830,123 - Daly , et al. * May 16, 1 | 1989-05-16 |
| Drag drill bit having improved flow of drilling fluid Grant 4,794,994 - Deane , et al. * January 3, 1 | 1989-01-03 |
| Mounting means for cutting elements in drag type rotary drill bit Grant 4,682,663 - Daly , et al. July 28, 1 | 1987-07-28 |
| Rolling cutter drill bit Grant 4,657,093 - Schumacher April 14, 1 | 1987-04-14 |
| Seal assembly for drill bits Grant 4,623,028 - Murdoch , et al. November 18, 1 | 1986-11-18 |
| Inserts for drilling bits Grant 4,334,586 - Schumacher June 15, 1 | 1982-06-15 |
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