Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860544 | Closed cryogenic barrier for containment of hazardous material migration in the earth | John A. Drumheller | 1989-08-29 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860544 | Closed cryogenic barrier for containment of hazardous material migration in the earth | John A. Drumheller | 1989-08-29 |