Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8047305 | Vacuum feed supply system for drilling fluid additives | Nels A. Hansen, John B. Trenery | 2011-11-01 |
| 7712551 | Vacuum feed supply system for drilling fluid additives | Nels A. Hansen, John B. Trenery | 2010-05-11 |
| 5919738 | Fluids for use in drilling and completion operations comprising water insoluble colloidal complexes for improved rheology and filtration control | James Norfleet, Michael A. Jarrett, Dennis K. Clapper, Geoffrey Robinson, Ronald G. Bland +2 more | 1999-07-06 |
| 5658860 | Environmentally safe lubricated well fluid method of making a well fluid and method of drilling | David E. Clark | 1997-08-19 |
| 5586608 | Method of making an anti-bit balling well fluid using a polyol having a cloud point, and method of drilling | David E. Clark | 1996-12-24 |
| 5099930 | Drilling fluid methods and composition | Dorothy P. Enright, F. Martin Smith, Alphonse C. Perricone | 1992-03-31 |
| 5007489 | Drilling fluid methods and composition | Dorothy P. Enright, F. Martin Smith, Alphonse C. Perricone | 1991-04-16 |