Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4345623 | Multiport disk valve, especially for dust-remover duct systems | Walther Krull, Dieter Kohn | 1982-08-24 |
| 4298362 | Filter cleaning device | Walther Krull, Alfred Bekaan | 1981-11-03 |