Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4745505 | Magnetic head with a modified gap filler | Johannes J. Ponjee | 1988-05-17 |
| 4586092 | Thermo-magneto-optical memory device and recording medium therefor | Jan W. D. Martens | 1986-04-29 |
| 4493887 | Optical recording element | Johannes J. Ponjee, Jan W. D. Martens | 1985-01-15 |