Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5290147 | Variable pitch marine propeller with shift biasing and synchronizing mechanism | Michael A. Karls, Roger E. Koepsel | 1994-03-01 |
| 5236310 | Marine propeller with performance pitch, including five blade version | Roger E. Koepsel | 1993-08-17 |
| 5219272 | Variable pitch marine propeller with hydrodynamic shifting | Roger E. Koepsel, Michael A. Karls | 1993-06-15 |
| 5104292 | Marine propeller with performance pitch, including five blade version | Roger E. Koepsel | 1992-04-14 |
| 4993151 | Method of making an easily removed marine propeller | Roger E. Koepsel, Hubert S. Gilgenbach, Terence C. Reinke | 1991-02-19 |
| 4925369 | Easily removed marine propeller | Roger E. Koepsel, Hubert S. Gilgenbach, Terence C. Reinke | 1990-05-15 |
| 4897061 | Gearcase exhaust vent for a marine propulsion system | Roger E. Koepsel | 1990-01-30 |
| 4802822 | Marine propeller with optimized performance blade contour | Hubert S. Gilgenbach | 1989-02-07 |
| 4781632 | Anti-ventilation plate | John J. Litjens, Michael E. Frazzell, Michael A. Karls, William P. Lang | 1988-11-01 |
| 4331429 | Symmetrical propeller | Roger E. Koepsel, Daniel G. Wilcox | 1982-05-25 |