Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857073 | Diesel fuel additive | Mark S. Filowitz | 1989-08-15 |
| 4809769 | Engine coolant flush-filtering using external gas pressure | Richard W. Smith, Rainer H. Labus | 1989-03-07 |
| 4797134 | Additive composition, for gasoline | — | 1989-01-10 |