Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8326144 | Transmission path monitoring method and device | Katsuji Yamaguchi | 2012-12-04 |
| 6697546 | Optical node system and switched connection method | Sadao Ibukuro, Satoshi Kuroyanagi | 2004-02-24 |
| 5873982 | Method and apparatus of discriminating coal species | Mitsuyuki Takahashi, Osamu Hatakeyama, Satoshi Sugawara, Fumio Kutsukake, Masatoshi Yokoyama +5 more | 1999-02-23 |
| 5793917 | Apparatus for compensating for dispersion in submarine optical amplification and transmission system | — | 1998-08-11 |
| 5510925 | Relay transmission system including optical amplification | Katsuo Suzuki | 1996-04-23 |
| 5218606 | Current-spare switching control system | Yoshitaka Eguchi | 1993-06-08 |
| 5134612 | Digital communication terminal equipment | — | 1992-07-28 |
| 5123020 | Phase synchronization pull-in system in bit error detecting apparatus | Atsuhiko Utsumi | 1992-06-16 |
| 4431600 | Extrusion molding of polyamidoimide resins | Kunisuke Sakamoto, Isamu Shiga | 1984-02-14 |