Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE39648 | Crankcase lubricant for heavy duty diesel oil | Andrew Ritchie | 2007-05-22 |
| 6004910 | Crankcase lubricant for modern heavy duty diesel and gasoline fueled engines | Ricardo Bloch, Arunas T. Lapinas, Andrew Ritchie, Malcolm Waddoups | 1999-12-21 |
| 5719107 | Crankcase lubricant for heavy duty diesel oil | Andrew Ritchie | 1998-02-17 |