Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4838821 | Drive mechanism particularly for flat-bottomed watercrafts | — | 1989-06-13 |
| 4519335 | Device for controlling the direction of movement and thrust force of a watercraft | Siegfried Lais, Reinhold Knecht, Detlev Stache | 1985-05-28 |
| 4419082 | Water-jet drive mechanism for driving and controlling of particularly shallow-draught watercrafts | Siegfried Lais | 1983-12-06 |
| 4418633 | Apparatus for controlling a watercraft | Juergen Issleib | 1983-12-06 |
| 4417877 | Water-jet drive mechanism for driving and controlling of particularly shallow-draught watercrafts | Achim Kessler, Gerd Krautkraemer | 1983-11-29 |
| 4412500 | Drive mechanism for ships or the like comprising a main propeller and an auxiliary mechanism | — | 1983-11-01 |
| 4411630 | Water-jet drive mechanism for the driving of watercraft | Siegfried Lais | 1983-10-25 |
| 4278431 | Hydro-jet propulsion device for driving and controlling of particularly flat-bottomed watercrafts | Gerd Krautkraemer | 1981-07-14 |
| 4220111 | Drive and control device for watercraft or the like having at least one pair of steerable propellers | Siegfreid Lais | 1980-09-02 |