Issued Patents All Time
Showing 51–69 of 69 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5809007 | Optical disk and optical disk reproduction apparatus | Yoshinari Takemura, Takashi Ishida, Yoshito Aoki, Shigeru Furumiya, Toyoji Gushima | 1998-09-15 |
| 5729525 | Two-layer optical disk | Takashi Ishida, Mamoru Shoji, Shinichi Konishi, Yoshito Aoki, Yoshiyuki Miyabata +2 more | 1998-03-17 |
| 5544137 | Optical disc record/playback apparatus | Tamotsu Matsuo, Kenzou Ishibashi | 1996-08-06 |
| 5375111 | Optical information recording medium, and audio and video information recording method | Takashi Ishida, Tadashige Furutani | 1994-12-20 |
| 5140580 | Optical disk apparatus operative with optimal recording power setting | Mitsuro Moriya, Yoshihisa Fukushima, Kenzo Ishibashi | 1992-08-18 |
| 5128911 | Optical disc reproducing apparatus having an automatic gain control circuit | Motoshi Ito, Kenzo Ishibashi | 1992-07-07 |
| 5119363 | Optical disk having an index mark | Isao Satoh, Tomio Yoshida, Kenji Koishi | 1992-06-02 |
| 4929823 | Optical pickup head with holographic servo signal detection using a spot size detection system | Makoto Kato, Tetsuo Saimi | 1990-05-29 |
| 4759006 | Abnormal track skipping detection and control arrangement | Kenji Koishi, Tomio Yoshida, Isao Satoh, Yuzuru Kuroki | 1988-07-19 |
| 4724533 | Optical head | Tomio Yoshida, Takashi Ishida | 1988-02-09 |
| 4700336 | Optical recording and playback apparatus using plural light spots | Tomio Yoshida, Yoshinobu Nakata, Toshio Satoh | 1987-10-13 |
| 4689780 | Optical recording and reproducing head | Tomio Yoshida, Isao Satoh, Kenji Koishi | 1987-08-25 |
| 4679184 | Optical recording and reproducing apparatus having erasing beam spot with asymmetrical intensity distribution | Tomio Yoshida | 1987-07-07 |
| 4566088 | Optical and reversible recording and reproducing apparatus | Tomio Yoshida, Isao Satoh, Kenji Koishi, Yuzuru Kuroki | 1986-01-21 |
| 4564931 | Optical recording and reproducing head | Tomio Yoshida, Isao Satoh, Kenji Koishi | 1986-01-14 |
| 4546462 | Optical data recording and reproducing apparatus | Kenji Koishi, Tomio Yoshida, Isao Satoh | 1985-10-08 |
| 4545044 | Method and apparatus for optically recording and reproducing information | Isao Satoh, Tomio Yoshida, Kenji Koishi | 1985-10-01 |
| 4535439 | Optical having index mark and sector mark | Isao Satoh, Tomio Yoshida, Kenji Koishi | 1985-08-13 |
| 4509156 | Semiconductor laser driving system | Tomio Yoshida, Isao Satoh, Kenji Koishi | 1985-04-02 |