Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4822151 | Optical device with phase-locked diodelaser array | Kimio Tatsuno, Jan Opschoor, Ronald R. Drenten | 1989-04-18 |
| 4816385 | Method of optically recording and erasing information | Dirk J. Gravesteijn | 1989-03-28 |
| 4808514 | Method for the optical recording of information and an optical recording element used in the method | Dirk J. Gravesteijn | 1989-02-28 |