Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855175 | Magnetic recording medium and production thereof | Hideaki Niimi, Noboru Isoe | 1989-08-08 |
| 4847109 | Method of a making magnetic recording medium | Susumu Shibasaki | 1989-07-11 |
| 4826739 | Magnetic recording medium | Noboru Isoe, Tetsuo Mizumura | 1989-05-02 |