Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4846981 | Method of restoring permeability around wellbores | — | 1989-07-11 |
DB
Dale F. Brost
Overall (1989): #123,825 of 140,708Top 90%
1
Patents 1989