Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5702850 | Thermosensitive reversible color-developing and disappearing agent | Makoto Nishioka, Masaki Nishimura, Yoshiyuki Takahashi | 1997-12-30 |
| 5680246 | Optical amplifier and optical transmission apparatus | Tsukasa Takahashi, Hiroyuki Itou, Yuji Tamura, Michikazu Shima, Yumiko Kawasaki +6 more | 1997-10-21 |
| 5625481 | Auxiliary-signal transmission system | Yuji Tamura, Hiroyuki Itou, Tsukasa Takahashi, Michikazu Shima, Yumiko Kawasaki | 1997-04-29 |