Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859317 | Purification process for bitumen froth | William Edward Shelfantook, Larry P. Hackman | 1989-08-22 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859317 | Purification process for bitumen froth | William Edward Shelfantook, Larry P. Hackman | 1989-08-22 |