Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4966821 | Perpendicular magnetic recording medium | Ikue Kawashima, Futoyoshi Koh, Masafumi Kumano | 1990-10-30 |
SR
Shinei Ryu
Ricoh Research Institute Of General Electronics Co.: 1 patents #21 of 68Top 35%
Overall (All Time): #3,914,219 of 4,157,543Top 95%
1
Patents All Time