Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5684778 | Initialization process for a phase change recording medium with a zero level drop in flash light emission | Noboru Yamada, Katsumi Kawahara | 1997-11-04 |
| 5635267 | Optical information recording medium of phase change type having variably grooved tracks depending on their radial locations | Noboru Yamada, Kenichi Nishiuchi, Nobuo Akahira, Eiji Ohno, Kenichi Nagata +1 more | 1997-06-03 |
| 5587216 | Optical recording medium | Kazumi Yoshioka, Takeo Ohta, Katsumi Kawahara | 1996-12-24 |
| 5545454 | Optical information recording medium and method of designing its structure | Noboru Yamada, Nobuo Akahira, Kenichi Nishiuchi, Kenichi Nagata, Eiji Ohno | 1996-08-13 |
| 5453346 | Optical information recording medium having protection layers with different properties on both sides of an optical active layer | Katsumi Kawahara, Noboru Yamada | 1995-09-26 |
| 5439752 | Optical recording medium and reflecting film for use therein | Kazumi Yoshioka, Takeo Ohta, Masami Uchida | 1995-08-08 |
| 5424106 | Optical information recording medium and method of designing its structure | Noboru Yamada, Nobuo Akahira, Kenichi Nishiuchi, Kenichi Nagata, Eiji Ohno | 1995-06-13 |
| 5395669 | Optical record medium | Katsumi Kawahara, Takeo Ohta, Tetsuya Akiyama | 1995-03-07 |
| 5256518 | Information storage disk employing a reflective layer having good malleability | Tetsuya Akiyama, Hidemi Isomura, Takeo Ohta | 1993-10-26 |
| 5230973 | Method of recording and erasing information in an erasible optical recording medium | Kazumi Yoshioka, Takeo Ohta, Masami Uchida, Katsumi Kawahara | 1993-07-27 |
| 5194363 | Optical recording medium and production process for the medium | Kazumi Yoshioka, Takeo Ohta, Masami Uchida, Katsumi Kawahara | 1993-03-16 |
| 5191565 | Optical information recording medium | Kazuo Inoue, Takeo Ohta, Masami Uchida, Kazumi Yoshioka | 1993-03-02 |
| 5147701 | Information recording medium | Takeo Ohta, Tetsuya Akiyama, Hidemi Isomura | 1992-09-15 |