Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6498129 | Two-cycle lubricating oil containing polyisobutylene amine | Rolfe J. Hartley | 2002-12-24 |
| 5962378 | Synergistic combinations for use in functional fluid compositions | George Mortimer Tiffany, III, Rolfe J. Hartley, Antonio Gutierrez | 1999-10-05 |
| 5932790 | Clutch friction test for motorcycle lubricants | Charles F. Hoffman, Patrick J. Colby, Roger K. Nibert | 1999-08-03 |
| 5888948 | Two-cycle lubricating oil | Charles F. Hoffman | 1999-03-30 |