Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5336559 | Magnetic recording medium | Hiroaki Yamagishi, Setsuko Kawahara, Noboru Koyama | 1994-08-09 |
| 5284716 | Magnetic recording medium | Yoshitaka Yasufuku, Noboru Koyama, Masahiro Umemura, Takemasa Namiki, Seiichi Tobisawa +2 more | 1994-02-08 |