Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867768 | Muffler apparatus with filter trap and method of use | Bruce Hoppenstedt | 1989-09-19 |
| 4851015 | Muffler apparatus with filter trap and method of use | Douglas E. Flemming, Edward A. Steinbrueck, Bruce Hoppenstedt | 1989-07-25 |
| 4832661 | Apparatus and method for maintaining alternator output above predetermined levels | Douglas E. Flemming | 1989-05-23 |