Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11104837 | Drilling fluids and methods for making the same | — | 2021-08-31 |
| 10421892 | Drilling fluids and methods for making the same | — | 2019-09-24 |
| 6118542 | Method and apparatus for determination of a quality property of a piece of meat | Jan Rud Andersen, Claus Borggaard, Allan J. Rasmussen | 2000-09-12 |
| 5269383 | Navigable downhole drilling system | — | 1993-12-14 |
| 5248896 | Power generation from a multi-lobed drilling motor | — | 1993-09-28 |
| 5171138 | Composite stator construction for downhole drilling motors | — | 1992-12-15 |
| 4926949 | Thermal shield for drilling motors | — | 1990-05-22 |
| 4901806 | Apparatus for controlled absorption of axial and torsional forces in a well string | — | 1990-02-20 |
| 4844179 | Drill string stabilizer | Rory McCrae Tulloch, William M. Stewart | 1989-07-04 |
| 4807708 | Directional drilling of a drill string | Roger John Catherall, William M. Stewart, Randall Pounds | 1989-02-28 |
| 4796704 | Drop ball sub-assembly for a down-hole device | William M. Stewart, Rory McCrae Tulloch | 1989-01-10 |
| 4775017 | Drilling using downhole drilling tools | Rory McCrae Tulloch, William M. Stewart | 1988-10-04 |