Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4722517 | Mechanical spring having negative spring stiffness useful in an electroacoustic transducer | Kees Dijkstra, Jan Huizinga | 1988-02-02 |
| 4607382 | Electroacoustic transducer unit with reduced resonant frequency and mechanical spring with negative spring stiffness, preferably used in such a transducer unit | Kees Dijkstra, Jan Huizinga | 1986-08-19 |
| 4425809 | Measuring of tension and moments in a thin flexible tape | Bernardus Lambertus Martinus Van Bakel, Guillaume P. C. van Kooijk | 1984-01-17 |
| 4348706 | Edge guide for a magnetic tape | — | 1982-09-07 |
| 4318957 | Carrier foil for a magnetic recording tape, and method of manufacturing same | — | 1982-03-09 |
| 4199796 | Tape guide arrangement for a transversely scanning magnetic recorder | — | 1980-04-22 |