Issued Patents All Time
Showing 26–29 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7149317 | CMOS high impedance circuit | — | 2006-12-12 |
| 7062058 | Cylindrical microphone having an electret assembly in the end cover | Michael G. M. Steeman, Hendrik Dolleman, Paul Christiaan van Hal, Jan Hijman, Dion Ivo de Roo +2 more | 2006-06-13 |
| 6937735 | Microphone for a listening device having a reduced humidity coefficient | Dion Ivo de Roo, Michel de Nooij, Raymond Mögelin | 2005-08-30 |
| 6353344 | High impedance bias circuit | — | 2002-03-05 |