Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874637 | Method of making thin film magnetic recording medium | — | 1989-10-17 |
| 4871582 | Method of manufacturing magnetic recording medium | — | 1989-10-03 |
| 4810592 | Thin film magnetic recording medium and producing method of the same | — | 1989-03-07 |
| 4802050 | Magnetic recording medium | Takemi Yamamoto | 1989-01-31 |