Feenstra; Robijn
Patent Applications and Registrations
Patent applications and USPTO patent grants for Feenstra; Robijn.The latest application filed is for "downhole motor and method for directional drilling of boreholes".
- Feenstra; Robijn - Rijswijk NL
| Patent | Date |
|---|---|
| Downhole motor and method for directional drilling of boreholes Grant 4,485,879 - Kamp , et al. December 4, 1 | 1984-12-04 |
| Method and means for controlling the course of a bore hole Grant 4,465,147 - Feenstra , et al. August 14, 1 | 1984-08-14 |
| Rotary bit with jet nozzles Grant 4,341,273 - Walker , et al. July 27, 1 | 1982-07-27 |
| Rotary bit with ridges Grant 4,116,289 - Feenstra September 26, 1 | 1978-09-26 |
| Rotary bit for hydraulically drilling holes into underground formations Grant 3,881,561 - Pols , et al. May 6, 1 | 1975-05-06 |
| Diamond Bit Grant 3,747,699 - Feenstra , et al. July 24, 1 | 1973-07-24 |
| Diamond Bit With Annular Mud Distributing Groove Grant 3,743,036 - Feenstra , et al. July 3, 1 | 1973-07-03 |
| Diamond Bit Grant 3,640,356 - Feenstra February 8, 1 | 1972-02-08 |
| Diamond Bit Unit Grant 3,575,247 - Feenstra April 20, 1 | 1971-04-20 |
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