Issued Patents 1989
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887984 | Marine transmission with fluid coupler | — | 1989-12-19 |
| 4887983 | Chain drive marine propulsion system with dual counterrotating propellers | Herbert A. Bankstahl | 1989-12-19 |
| 4887982 | Gear driven marine propulsion system with steerable gearcase and dual counterrotating propellers | Herbert A. Bankstahl | 1989-12-19 |
| 4872859 | Lift and latch apparatus for an outboard motor | John M. Griffiths, Lyle M. Forsgren, Wayne T. Beck | 1989-10-10 |
| 4872857 | Operation optimizing system for a marine drive unit | Herbert A. Bankstahl, John M. Griffiths, Lyle M. Forsgren, Wayne T. Beck | 1989-10-10 |
| 4869692 | Outboard marine propulsion system including a chain drive mechanism | — | 1989-09-26 |
| 4865569 | Variable height marine propulsion mechanism | — | 1989-09-12 |
| 4861292 | Speed optimizing positioning system for a marine drive unit | John M. Griffiths, Wayne T. Beck | 1989-08-29 |
| 4836811 | Transom extension mounting assembly for outboard motors | John M. Griffiths, John J. Litjens | 1989-06-06 |
| 4826461 | Propeller protector | — | 1989-05-02 |
| 4820209 | Torque converter marine transmission with variable power output | — | 1989-04-11 |
| 4817566 | Four-stroke cycle induction tuned V-engine with central exhaust manifold | — | 1989-04-04 |
| 4813897 | Combined trim, tilt and lift apparatus for a marine propulsion device | John M. Griffiths, Wayne T. Beck | 1989-03-21 |