Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4597444 | Method for excavating a large diameter shaft into the earth and at least partially through an oil-bearing formation | — | 1986-07-01 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4597444 | Method for excavating a large diameter shaft into the earth and at least partially through an oil-bearing formation | — | 1986-07-01 |