Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4835049 | Magnetic recording medium | Shu Ishiguro | 1989-05-30 |
| 4818606 | Highly running-endurant magnetic recording medium | Noboru Koyama, Shu Ishiguro | 1989-04-04 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4835049 | Magnetic recording medium | Shu Ishiguro | 1989-05-30 |
| 4818606 | Highly running-endurant magnetic recording medium | Noboru Koyama, Shu Ishiguro | 1989-04-04 |