Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6642188 | Lubricating oil composition for outboard engines | Rolfe J. Hartley, Malcolm Waddoups | 2003-11-04 |
| 6525004 | Combustion improving additive for small engine lubricating oils | Rolfe J. Hartley, William H. Stover | 2003-02-25 |