Grappendorf; Richard H.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Grappendorf; Richard H..The latest application filed is for "bit design for a rotating bit incorporating synthetic polycrystalline cutters".
- Grappendorf; Richard H. - Riverton UT
| Patent | Date |
|---|---|
| Bit design for a rotating bit incorporating synthetic polycrystalline cutters Grant 4,744,427 - Grappendorf May 17, 1 | 1988-05-17 |
| Earth boring bit for soft to hard formations Grant 4,673,044 - Bigelow , et al. June 16, 1 | 1987-06-16 |
| Cutter configuration for a gage-to-shoulder transition and face pattern Grant 4,586,574 - Grappendorf May 6, 1 | 1986-05-06 |
| Tooth configuration for an earth boring bit Grant 4,499,959 - Grappendorf , et al. February 19, 1 | 1985-02-19 |
| Diamond cutting element in a rotating bit Grant 4,491,188 - Grappendorf January 1, 1 | 1985-01-01 |
| Drill bit Grant 4,352,400 - Grappendorf , et al. October 5, 1 | 1982-10-05 |
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