Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4816933 | Magnetic recording medium of particular coercive force, filling ratio, and protrusions and recording/reproducing method therefor | Toshiaki Izumi, Kiyoshi Noguchi, Hisae Shimizu | 1989-03-28 |
| 4599280 | Magnetic recording medium | Toshiaki Izumi, Kiyoshi Noguchi | 1986-07-08 |