Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5680246 | Optical amplifier and optical transmission apparatus | Hiroyuki Itou, Yuji Tamura, Michikazu Shima, Kazuo Yamane, Yumiko Kawasaki +6 more | 1997-10-21 |
| 5663114 | Catalyst for production of pyromellitic anhydride and method for production of pyromellitic anhydride | Tatsuya Kawabata, Masaaki Okuno, Yasuhisa Emoto, Yasushi Kiyooka, Kenji Ueda | 1997-09-02 |
| 5625481 | Auxiliary-signal transmission system | Yuji Tamura, Hiroyuki Itou, Michikazu Shima, Yumiko Kawasaki, Kazuo Yamane | 1997-04-29 |