Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4833753 | Filter apparatus, in particular on vacuum cleaners | — | 1989-05-30 |
| 4803268 | Process for the preparation of cyclohexanedionecarboxylic acid derivatives | Hans-Georg Brunner | 1989-02-07 |