Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872156 | Record carrier with a preformed information track for recording information with a radiation beam | Christiaan Steenbergen | 1989-10-03 |
| 4818666 | Erasable optical recording element and method of optically recording and erasing information | Carlus J. Van Der Poel | 1989-04-04 |
| 4816385 | Method of optically recording and erasing information | Carolus J. van der Poel | 1989-03-28 |
| 4808514 | Method for the optical recording of information and an optical recording element used in the method | Carolus J. van der Poel | 1989-02-28 |