Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8280082 | Electret assembly for a microphone having a backplate with improved charge stability | Aart Zeger van Halteren, Roelof A. Marissen, Michel Bosman, Dion Ivo de Roo, Raymond Mögelin | 2012-10-02 |
| 7684575 | Electret assembly for a microphone having a backplate with improved charge stability | Aart Zeger van Halteren, Roelof A. Marissen, Michel Bosman, Dion Ivo de Roo, Raymond Mögelin | 2010-03-23 |
| 7136496 | Electret assembly for a microphone having a backplate with improved charge stability | Aart Zeger van Halteren, Roelof A. Marissen, Michel Bosman, Dion Ivo de Roo, Raymond Mögelin | 2006-11-14 |
| 6937735 | Microphone for a listening device having a reduced humidity coefficient | Dion Ivo de Roo, Adrianus Maria Lafort, Raymond Mögelin | 2005-08-30 |