Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853133 | Coal dewatering | Steven Flynn | 1989-08-01 |
| 4846957 | Precipitation of asphaltene | Graham Ronald Johnson | 1989-07-11 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853133 | Coal dewatering | Steven Flynn | 1989-08-01 |
| 4846957 | Precipitation of asphaltene | Graham Ronald Johnson | 1989-07-11 |