Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5099930 | Drilling fluid methods and composition | Dorothy P. Enright, William M. Dye, F. Martin Smith | 1992-03-31 |
| 5007489 | Drilling fluid methods and composition | Dorothy P. Enright, William M. Dye, F. Martin Smith | 1991-04-16 |
| 4963273 | Modified non-polluting liquid phase shale swelling inhibition drilling fluid and method of using same | Dennis K. Clapper, Dorothy P. Enright | 1990-10-16 |
| 4941981 | Modified non-polluting liquid phase shale swelling inhibition drilling fluid | Dennis K. Clapper, Dorothy P. Enright | 1990-07-17 |
| 4830765 | Modified non-polluting liquid phase shale swelling inhibition drilling fluid and method of using same | Dennis K. Clapper, Dorothy P. Enright | 1989-05-16 |
| 4663076 | Invert emulsion drilling fluid comprising oligamide composition | Dennis K. Clapper, Darrell P. Salisbury | 1987-05-05 |
| 4575428 | Invert emulsion drilling fluid comprising oligamide composition | Dennis K. Clapper, Darrell P. Salisbury | 1986-03-11 |
| 4309329 | Aqueous drilling fluid additive | James M. Lucas, Dorothy P. Enright | 1982-01-05 |
| 4293427 | Drilling fluid containing a copolymer filtration control agent | James M. Lucas, Dorothy P. Enright | 1981-10-06 |
| 4288582 | Aqueous drilling fluid additive, composition and process | James M. Lucas, Dorothy P. Enright | 1981-09-08 |
| 4283517 | Continuous process for solution polymerization of acrylamide | James M. Lucas | 1981-08-11 |
| 4268400 | Aqueous drilling fluid additive, composition and process | James M. Lucas, Dorothy P. Enright | 1981-05-19 |