Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4829963 | Method for the regulation of the mixture composition in a mixture-compressing internal combustion engine | Kurt Oblaender, Joerg Abthoff | 1989-05-16 |
| 4824363 | Process and equipment for removing odorous substances from the fresh air for vehicle cabins | Joerg Abthoff, Hans-Dieter Schuster, Gottfried Wollenhaupt, Hans Schmitz | 1989-04-25 |