Issued Patents All Time
Showing 26–32 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4963273 | Modified non-polluting liquid phase shale swelling inhibition drilling fluid and method of using same | Alphonse C. Perricone, Dorothy P. Enright | 1990-10-16 |
| 4941981 | Modified non-polluting liquid phase shale swelling inhibition drilling fluid | Alphonse C. Perricone, Dorothy P. Enright | 1990-07-17 |
| 4830765 | Modified non-polluting liquid phase shale swelling inhibition drilling fluid and method of using same | Alphonse C. Perricone, Dorothy P. Enright | 1989-05-16 |
| 4735732 | Filtration control additive for invert emulsion drilling fluids and method of preparation | Darrell P. Salisbury | 1988-04-05 |
| 4728444 | Filtration control additive for invert emulsion drilling fluids and method of preparation | Darrell P. Salisbury | 1988-03-01 |
| 4663076 | Invert emulsion drilling fluid comprising oligamide composition | Alphonse C. Perricone, Darrell P. Salisbury | 1987-05-05 |
| 4575428 | Invert emulsion drilling fluid comprising oligamide composition | Alphonse C. Perricone, Darrell P. Salisbury | 1986-03-11 |