Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818666 | Erasable optical recording element and method of optically recording and erasing information | Dirk J. Gravesteijn | 1989-04-04 |
CP
Carlus J. Van Der Poel
Overall (1989): #127,197 of 140,708Top 95%
1
Patents 1989