Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845758 | Equalizer with adjustable band filters and a digital filter suitable for use in the equalizer | Franciscus J. Op de Beek, Johan M. Rijnsburger, Jacob M. Van Nieuwland | 1989-07-04 |
| 4677389 | Noise-dependent volume control having a reduced sensitivity to speech signals | Franciscus J. Op de Beek | 1987-06-30 |