Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5671074 | Optical multiplex transmission equipment and method | Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda +6 more | 1997-09-23 |
| 5600631 | Self-healing ring switch and method of controlling the same | Yoshihiro Ashi, Hiroyuki Fujita | 1997-02-04 |