Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881133 | Arrangement for the recording of an information signal | Gunter Joschko | 1989-11-14 |
| 4821250 | Process and apparatus for the recording of an information signal | Guenter Joschko | 1989-04-11 |
| 4814047 | Method for producing a prerecorded disk-shaped die | Gunter Joschko | 1989-03-21 |