Knowlton; R. Helene
Patent Applications and Registrations
Patent applications and USPTO patent grants for Knowlton; R. Helene.The latest application filed is for "optimized pdc cutting shape".
- Knowlton; R. Helene - Houston TX
| Patent | Date |
|---|---|
| Optimized PDC cutting shape Grant 5,332,051 - Knowlton July 26, 1 | 1994-07-26 |
| Diamond drag bit for soft formations Grant 4,981,184 - Knowlton , et al. January 1, 1 | 1991-01-01 |
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