Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE35461 | Lubricating oil additives | John F. Marsh | 1997-02-25 |
| 5534168 | Preparation of overbased magnesium sulphonates | John A. Cleverley, Robert A. Wardle, John F. Marsh, Jeremy Spencer | 1996-07-09 |
| 5069804 | Lubricating oil additives | John F. Marsh | 1991-12-03 |