Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7286680 | Cylindrical microphone having an electret assembly in the end cover | Hendrik Dolleman, Paul Christiaan van Hal, Adrianus Maria Lafort, Jan Hijman, Dion Ivo de Roo +2 more | 2007-10-23 |
| 7062058 | Cylindrical microphone having an electret assembly in the end cover | Hendrik Dolleman, Paul Christiaan van Hal, Adrianus Maria Lafort, Jan Hijman, Dion Ivo de Roo +2 more | 2006-06-13 |