Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5708647 | Laser power supply circuit as well as option recording and/or reading device comprising such a laser power supply circuit | Martinus P. M. Bierhoff | 1998-01-13 |
| 5140282 | Current amplifier arrangement | Martinus P. M. Bierhoff | 1992-08-18 |
| 5105249 | Radiation-sensitive semiconductor device having a transistor | Martinus P. M. Bierhoff | 1992-04-14 |
| 5103439 | Beam focus control system for optical record carrier scanning apparatus | Martinus P. M. Bierhoff | 1992-04-07 |
| 5099126 | Photosensitive semiconductor device having radiation sensitive diodes and photocurrent amplification | Martinus P. M. Bierhoff | 1992-03-24 |
| 4908551 | DC/AC bridge circuit | Adrianus W. Ludikhuize, Franciscus A. C. M. Schoofs | 1990-03-13 |
| 4712091 | Digital/analog converter having a switchable reference current | Franciscus A. C. M. Schoofs, Martinus P. M. Bierhoff, Albert H. Slomp | 1987-12-08 |
| 4689501 | Signal level detector for compact disc player | Franciscus A. C. M. Schoofs, Martinus P. M. Bierhoff, Albert H. Slomp | 1987-08-25 |
| 4663749 | Apparatus for reproducing information from an optically readable record carrier | Martinus P. M. Bierhoff, Franciscus A. C. M. Schoofs, Albert H. Slomp | 1987-05-05 |
| 4560836 | Four-wire communication line circuit and conference network comprising such circuits | Adrianus W. M. van den Enden | 1985-12-24 |
| 4484151 | Amplifier circuit | Aloysius J. Nijman, Franciscus A. C. M. Schoofs | 1984-11-20 |
| 4477696 | Conference system for telephony | Adrianus W. M. van den Enden, Aloysius J. Nijman | 1984-10-16 |
| 4425478 | Conference system for telephony | Adrianus W. M. van den Enden, Teunis A. van Harreveld | 1984-01-10 |
| 4340869 | Amplifier for use in a line circuit | — | 1982-07-20 |
| 4319092 | Current detection circuit arrangement for an automatic telephone exchange | Adrianus W. M. van den Enden | 1982-03-09 |