Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5567315 | Lifting-lowering type aquarium filter | Walter Weidenmann, Frank v. Luetzau, Gerhard Frank, Michael Schmidt, Ferdinand Mayer | 1996-10-22 |
| 5404840 | Covering device for an aquarium, terrarium or similar vivarium | Walter Wiedenmann, Gerhard Frank, Ferdinand Mayer, Albert Baier, Michael Schmidt +1 more | 1995-04-11 |
| 5277800 | Inner filter for aquarium | Klaus Dieckmann, Ferdinand Mayer, Walter Wiedenmann | 1994-01-11 |