Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876994 | Hydraulic play compensation element | Walter Speil, Bolko Schuseil | 1989-10-31 |
| 4856468 | Ball-and-socket joint | Walter Speil, Michael Zipprath | 1989-08-15 |
| 4840160 | Valve control device | Michael Zipprath | 1989-06-20 |
| 4811631 | Shifting method for hydrodynamic-mechanical transmission | Ernst-August Honig, Lothar Kaspar, Manfred Kalversberg, Gerd Oberpichler, Gottfried Hagemann | 1989-03-14 |