Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |