Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9255425 | Closing device for a door | Norman Wittke | 2016-02-09 |
| 8720959 | Door opening mechanism with automatic adjustment of the door opening latch | Norman Wittke | 2014-05-13 |
| 7900981 | Door opener system and adapter part for use in a door opener | — | 2011-03-08 |