Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861699 | Method of making a master disk used in making optical readable information disks | Jacob Wijdenes, Cornelis Weening | 1989-08-29 |
JR
Johannes M. Ramaker
Overall (1989): #38,402 of 140,708Top 30%
1
Patents 1989