Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7894317 | Optical recording medium recording and reproducing apparatus and tracking control method | Hiroshi Hasegawa | 2011-02-22 |
| 7518961 | Optical disk recording and reproducing apparatus for recording and reproducing data in and from optical disk | Hiroshi Hasegawa | 2009-04-14 |
| 7016271 | Optical recording/playback apparatus and optical recording medium | — | 2006-03-21 |
| 6795381 | Multi-body multi-purpose information processing apparatus | Hideo Ando, Seigo Ito, Naobumi Seo, Hiroaki Unno, Hisashi Yamada +2 more | 2004-09-21 |
| 6301208 | Optical disk having radial lands and grooves, and boundary recognition marks, and optical disk apparatus for emitting a light beam to an optical disk having a plurality of error correction blocks after boundary recognition marks | Toshihiro Sugaya, Kazuo Watabe | 2001-10-09 |
| 5946283 | Optical information recording medium and optical information reproducing device | Kazuo Watabe | 1999-08-31 |
| 5673248 | Phase change type optical recording apparatus and optical recording method using an overwrite system | Hiroshi Hasegawa | 1997-09-30 |
| 5673249 | Phase change type optical recording apparatus and optical recording method using an overwrite system | Hiroshi Hasegawa | 1997-09-30 |
| 5493552 | Phase change optical information recording system with a header area in the form of prepit rows | — | 1996-02-20 |
| 5475210 | Noise reduction system for optical record and reproduction apparatus using auto-power controlled semiconductor laser device | Toyoki Taguchi, Toshihiro Sugaya, Hisashi Yamada, Kei Shimura, Isao Hoshino +4 more | 1995-12-12 |
| 5187694 | Magneto-optical recording medium comprising recording layer and thermal bias layer, and method for recording, erasing and overwriting on the medium | Katsutarou Ichihara | 1993-02-16 |
| 4984226 | Magnetoptic head for recording/erasing information using a cylindrical hollow permanent magnet | — | 1991-01-08 |
| 4868802 | Magnetooptic recording and erasing head which performs biasing, tracking and focusing | — | 1989-09-19 |