Issued Patents 1997
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5668659 | Optical fibers for optical amplifiers | Tadashi Sakamoto, Terutoshi Kanamori, Makoto Shimizu, Yasutake Ohishi, Shoichi Sudo | 1997-09-16 |
| 5659607 | Telephone set | Fumihiro Minamizawa | 1997-08-19 |
| 5649007 | Telephone set of distinctive ringing type capable of generating different calling sounds after the telephone set is connected to remote calling party | — | 1997-07-15 |
| 5623380 | Circuit and method for controlling head tracking based on an average of reproduced pilot signals from each recording unit | Masayoshi Noguchi | 1997-04-22 |
| 5604609 | Light reflection type detection device in facsimile machine | Katsutoshi Seguchi, Yoshikatsu Kameyama, Yasuhito Bandai, Tomohisa Higuchi, Hiroaki Yazawa | 1997-02-18 |