Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880528 | Method and apparatus for hydrocarbon recovery from tar sands | James D. Westhoff | 1989-11-14 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880528 | Method and apparatus for hydrocarbon recovery from tar sands | James D. Westhoff | 1989-11-14 |