Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5695911 | Optical recording medium | Hisato Itoh, Akio Karasawa, Kenichi Sugimoto, Shin Aihara | 1997-12-09 |
| 5646273 | Phthalocyanine compound and optical recording medium containing it | Hideki Umehara, Kenichi Sugimoto, Ryu Oi, Hisato Itoh | 1997-07-08 |