Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4993496 | Quick release valve for sprinkler head | Horst Zientek, Nikolaus Grainer, Heinz Heider | 1991-02-19 |
| 4898246 | Quick release valve for sprinkler head | Horst Zientek | 1990-02-06 |