Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5916003 | Propeller vent plug with fluid passage | Paul A. Masini, Michael P. Mihelich | 1999-06-29 |
| 5791874 | Marine propeller with adjustable cupping | — | 1998-08-11 |
| 4794888 | Fuel puddle suction system for fuel injected engine | — | 1989-01-03 |
| 4781632 | Anti-ventilation plate | John J. Litjens, Michael E. Frazzell, Michael A. Karls, Ronald M. Steiner | 1988-11-01 |
| 4767366 | Water ram scoop for cooling water intake | — | 1988-08-30 |
| 4752257 | Cooling water intake with increased flow | Michael A. Karls | 1988-06-21 |