Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5223712 | Closed loop ionization apparatus for detecting trace gases | Joerg Boscher, Dirk Hoffmeyer | 1993-06-29 |
| 4944489 | Rotary valve and seal | Bernd Bruggestrath, Rudolf August Kappe | 1990-07-31 |
| 4281817 | Disc valve | Rudolf Koenen | 1981-08-04 |