Issued Patents All Time
Showing 26–43 of 43 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5906907 | Optical disc | Ryoichi Sudo, Tetsuo Tajima, Eiji Koyama | 1999-05-25 |
| 5766407 | Optical disk producing apparatus | Ryoichi Sudo, Tetsuo Tajima, Toshiaki Taii | 1998-06-16 |
| 5686227 | Optical reproduction apparatus | Ryoichi Sudo, Tetsuo Tajima, Eiji Koyama | 1997-11-11 |
| 5582677 | Optical disk producing apparatus | Ryoichi Sudo, Tetsuo Tajima, Toshiaki Taii | 1996-12-10 |
| 5543271 | Optical recording and reproduction apparatus | Ryoichi Sudo, Tetsuo Tajima, Eiji Koyama | 1996-08-06 |
| 5427893 | Optical data recording medium | Eiji Koyama, Akira Gotoh, Shuhei Nakamichi, Ryoichi Sudo | 1995-06-27 |
| 5401610 | Optical disc | Ryoichi Sudo, Tetsuo Tajima, Eiji Koyama | 1995-03-28 |
| 5244775 | Method of manufacturing an optical disc | Ryoichi Sudo, Tetsuo Tajima, Eiji Koyama | 1993-09-14 |
| 5234792 | Optical data recording medium and manufacturing method thereof | Eiji Koyama, Akira Gotoh, Shuhei Nakamichi, Ryoichi Sudo | 1993-08-10 |
| 5071236 | Replica plate, process for producing the same and projection type television using the same | Ryoichi Sudo, Chiyoko Iwano, Tetsuo Tajima, Hiroyuki Onodera | 1991-12-10 |
| 4957990 | Materials for optical use | Ryoichi Sudo, Makoto Kobata, Tetsuo Tajima | 1990-09-18 |
| 4897228 | Method for producing optical disk base | Tetsuo Tajima, Ryoichi Sudo | 1990-01-30 |
| 4889757 | Optical recording disk | Shinkichi Horigome, Toshio Niihara, Norio Ohta, Yutaka Sugita, Yoshinori Miyamura +2 more | 1989-12-26 |
| 4835027 | Optical disc | Ryoichi Sudo, Tetsuo Tajima, Shinkichi Horigome | 1989-05-30 |
| 4812346 | Optical disc base plate and process for producing the same | Ryoichi Sudo, Tetsuo Tajima | 1989-03-14 |
| 4729938 | Optical disc base plate having a primer layer formed of an ultraviolet-cured resin composition | Tetsuo Tajima, Ryoichi Sudo | 1988-03-08 |
| 4668550 | Optical disc | Tetsuo Tajima, Ryoichi Sudo, Shinkichi Horigome | 1987-05-26 |
| 4456659 | Substrate for optical disc recording media | Ryoichi Sudo, Takeshi Watanabe | 1984-06-26 |