Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6096691 | Gear oil additive concentrates and lubricants containing them | Rolfe J. Hartley | 2000-08-01 |
| 5942470 | Lubricant compositions | Stephen Norman, Donald G. Campbell | 1999-08-24 |
| 5328619 | Oil additive concentrates and lubricants of enhanced performance capabilities | — | 1994-07-12 |
| 5225093 | Gear oil additive compositions and gear oils containing the same | Donald G. Campbell, Stephen Norman | 1993-07-06 |