Issued Patents 2023
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11617979 | Device and method for determining the pollution status of a particle filter in an air-cleaning device | Johannes Marra, Achim Gerhard Rolf Koerber | 2023-04-04 |
| 11555626 | Ventilation unit, system and method | Johannes Marra, Achim Gerhard Rolf Koerber | 2023-01-17 |