Issued Patents All Time
Showing 51–75 of 144 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6771587 | Optical information recording medium with plural information layers | Ken'ichi Nagata, Nobuo Akahira | 2004-08-03 |
| 6762985 | Optical recording method and optical recording device | Shigeaki Furukawa, Yuuichi Kamioka, Norifumi Oda | 2004-07-13 |
| 6754143 | Optical information recording medium, and method and apparatus for recording/reproducing information thereon | Tetsuya Akiyama, Kenji Narumi | 2004-06-22 |
| 6744724 | Recording and reproducing method for optical information recording medium and optical information recording medium | Ken'ichi Nagata, Noboru Yamada, Nobuo Akahira | 2004-06-01 |
| 6711105 | Method and apparatus for writing and reading optical recording medium | Kenji Narumi | 2004-03-23 |
| 6707776 | Recording and reproducing method of optical information recording medium | Ken'ichi Nagata, Eiji Ohno, Nobuo Akahira, Kenji Narumi | 2004-03-16 |
| 6700849 | Method and apparatus for writing and reading optical recording medium | Kenji Narumi | 2004-03-02 |
| 6697313 | Optical information recording and reproducing system with overwrite capability and recording medium for use therewith | Ken'ichi Nagata, Eiji Ohno, Nobuo Akahira, Kenji Narumi | 2004-02-24 |
| 6683739 | Optical information recording and reproducing system with overwrite capability and recording medium for use therewith | Ken'ichi Nagata, Eiji Ohno, Nobuo Akahira, Kenji Narumi | 2004-01-27 |
| 6667937 | Optical information recording medium and optical information recording and reproducing apparatus | Naoyasu Miyagawa, Eiji Ohno, Nobuo Akahira | 2003-12-23 |
| 6661749 | Substrate for optical recording medium, optical recording medium, master disc, master disc recording apparatus, and signal generating apparatus | Shigeaki Furukawa, Tetsuya Akiyama | 2003-12-09 |
| 6611491 | Optical recording medium having dual recording layers | Ken'ichi Nagata, Nobuo Akahira | 2003-08-26 |
| 6590915 | Optical apparatus and method for producing the same | Yasuo Kitaoka, Kazuhisa Yamamoto, Makoto Kato, Tomoaki Uno, Kiminori Mizuuchi | 2003-07-08 |
| 6587420 | Recording and reproducing method for optical information recording medium and optical information recording medium | Ken'ichi Nagata, Noboru Yamada, Nobuo Akahira | 2003-07-01 |
| 6584054 | Optical recording method and optical recording device | Shigeaki Furukawa, Yuuichi Kamioka, Norifumi Oda | 2003-06-24 |
| 6535468 | OPTICAL RECORDING MEDIUM HAVING AN AREA FOR RECORDING A PLURALITY OF RECORDING/REPRODUCTION CONDITIONS TO BE USED IN RECORDING/REPRODUCTION APPARATUSES AND RECORDING/REPRODUCTION METHOD AND APPARATUS THEREFOR | Tetsuya Akiyama, Shigeaki Furukawa, Kenji Narumi, Hiroyuki Yamaguchi | 2003-03-18 |
| 6532209 | Optical information recording medium and optical information recording and reproducing apparatus | Naoyasu Miyagawa, Eiji Ohno, Nobuo Akahira | 2003-03-11 |
| 6487151 | Optical information recording and reproducing system with overwrite capability and recording medium for use therewith | Ken'ichi Nagata, Eiji Ohno, Nobuo Akahira, Kenji Narumi | 2002-11-26 |
| 6483788 | Method and apparatus for writing and reading optical recording medium | Kenji Narumi | 2002-11-19 |
| 6469964 | Optical recording medium and recording/reproduction method and apparatus therefor | Tetsuya Akiyama, Shigeaki Furukawa, Kenji Narumi, Hiroyuki Yamaguchi | 2002-10-22 |
| 6456584 | Optical information recording medium comprising a first layer having a phase that is reversibly changeable and a second information layer having a phase that is reversibly changeable | Ken'ichi Nagata, Noboru Yamada, Nobuo Akahira | 2002-09-24 |
| 6434095 | Optical information recording medium, manufacturing method therefor, manufacturing apparatus therefor, and optical information recording and reproducing apparatus | Ken'ichi Nagata, Nobuo Akahira | 2002-08-13 |
| 6414922 | OPTICAL RECORDING MEDIUM HAVING AN AREA FOR RECORDING A PLURALITY OF RECORDING/REPRODUCTION CONDITIONS TO BE USED IN RECORDING/REPRODUCTION APPARATUSES AND RECORDING/REPRODUCTION METHOD AND APPARATUS THEREFORE | Tetsuya Akiyama, Shigeaki Furukawa, Kenji Narumi, Hiroyuki Yamaguchi | 2002-07-02 |
| 6411575 | OPTICAL RECORDING MEDIUM HAVING AN AREA FOR RECORDING A PLURALITY OF RECORDING/REPRODUCTION CONDITIONS TO BE USED IN RECORDING/REPRODUCTION APPARATUSES AND RECORDING/REPRODUCTION METHOD AND APPARATUS THEREFOR | Tetsuya Akiyama, Shigeaki Furukawa, Kenji Narumi, Hiroyuki Yamaguchi | 2002-06-25 |
| 6411592 | OPTICAL INFORMATION RECORDING MEDIUM HAVING CONVEX AND CONCAVE PORTIONS FOR RECORDING INFORMATION AND AN ADDITIONAL PORTION FOR CONDITION DATA, AND RECORDING AND REPRODUCING APPARATUS FOR USING THE MEDIUM | Naoyasu Miyagawa, Eiji Ohno, Nobuo Akahira | 2002-06-25 |