Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888035 | Process and apparatus for separation of a gaseous mixture | — | 1989-12-19 |
| 4828589 | Filter unit with apparatus for determining the saturation of a drying cartridge | Jens Piening | 1989-05-09 |
| 4805481 | Self-locking revolute joint, adjustable to an angle by moving an activation lever back and forth | Burckhard Becker, Ernst-Reiner Frohnhaus, Alfred Gedig, Josef Klink, Antonin Koucky | 1989-02-21 |