Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10525992 | Light signal | Kay Koester, Zeljko Marincic | 2020-01-07 |
| 10328958 | Light Signal | Kay Koester, Zeljko Marincic | 2019-06-25 |
| 9656681 | Circuit arrangement for revealing light signal errors | Kay Koester | 2017-05-23 |
| 9562952 | Method and apparatus for revealing errors in the case of a light signal | Kay Koester | 2017-02-07 |
| 8933814 | LED light signal | Eike Berg, Norbert Poepplow | 2015-01-13 |
| 8702282 | Light signal | Joerg Birkholz, Uwe Frost, Kay Koester, Zeljko Marincic, Norbert Poepplow | 2014-04-22 |