Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5759974 | Block-form cleaners for flush toilets | Ronald Menke, Alexander Ditze | 1998-06-02 |
| 4820449 | Cleaning block for flush toilet tanks | Ronald Menke, Bernd-Dieter Holdt | 1989-04-11 |
| 4683072 | Two-component cleaner and disinfectant tablet | Bernd-Dieter Holdt, Ronald Menke, Petra Hasselbach | 1987-07-28 |
| 4578207 | Two component cleaner and disinfectant tablet | Bernd-Dieter Holdt, Ronald Menke, Petra Hasselbach | 1986-03-25 |