Issued Patents All Time
Showing 51–75 of 85 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5815486 | Optical disk, recording/reproducing apparatus and method for rapidly recording/reproducing data on/from an optical disk using gray coding | Shoei Kobayashi, Toru Takeda | 1998-09-29 |
| 5805564 | Optical disk capable of detecting errors in address area and correcting errors in data area and recording method and apparatus therefor | Shoei Kobayashi, Yoichiro Sako | 1998-09-08 |
| 5784343 | Magneto-optical recording and/or reproducing apparatus having a plurality of optical systems | Tetsu Watanabe | 1998-07-21 |
| 5781567 | Digital coding method and apparatus for the correction of burst errors | Yoichiro Sako, Satoshi Otsuka | 1998-07-14 |
| 5781565 | Data recording/reproducing method, data reproducing apparatus and recording medium | Yoichiro Sako, Satoshi Otsuka, Minoru Tobita | 1998-07-14 |
| 5781518 | Disc recording method wherein a segment is recorded with reference data to control the phase of a data clock | Tetsu Watanabe, Yoichiro Sako | 1998-07-14 |
| 5684772 | Magneto-optical disc recording and reproducing system with level clamping | Tetsuji Kawashima | 1997-11-04 |
| 5675586 | Record medium, and method for recording to and reproducing from a record medium | Yoichiro Sako, Satoshi Otsuka, Minoru Tobita | 1997-10-07 |
| 5592465 | Disc recording method | Tetsu Watanabe, Yoichiro Sako | 1997-01-07 |
| 5587901 | Optical recording medium having a pre-formed recording track which is offset along its width to record frame sync signals of information | Yoichiro Sako, Masanobu Yamamoto | 1996-12-24 |
| 5559774 | Optical disc reproducing apparatus which employs a binary detector for the outer tracks and a ternary detector for the inner tracks | Tetsu Watanabe, Yoshiyuki Urakawa | 1996-09-24 |
| 5497367 | Optical recording medium | Yoichiro Sako | 1996-03-05 |
| 5488590 | Magneto-optical overwrite recording and reproducing system | Tetsu Watanabe | 1996-01-30 |
| 5469416 | Apparatus for reproducing recorded data and selectively either of read-only or recorded synchronization information from a magneto-optical recording medium | Yoichiro Sako, Masanobu Yamamoto | 1995-11-21 |
| 5436770 | Disc recording and/or reproducing apparatus having an enlarged locking range for correctly phased internal channel clocks | Takayasu Muto | 1995-07-25 |
| 5363352 | Magneto-optic disk apparatus | Minoru Tobita | 1994-11-08 |
| 5311491 | Method of data recording for optical disc having burst modulated track | Yoichiro Sako | 1994-05-10 |
| 5297125 | Optical recording medium and information recording apparatus for recording bursts of low-pass filtered reproduce-only information in a wobbling pre-groove on the optical recording medium | Yoichiro Sako | 1994-03-22 |
| 5287334 | Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus | Kietsu Iwabuchi, Koji Sasaki, Tetsu Watanabe, Yoshio Aoki | 1994-02-15 |
| 5216656 | Method for recording a CD-RAM which is compatible with a conventional CD recording format while allowing fast accessing | Yoichiro Sako | 1993-06-01 |
| 5206646 | Digital modulating method | Yoichiro Sako | 1993-04-27 |
| 5200935 | Recording apparatus using magneto-optical effect including control means for inhibiting energizing of the light beam generating means in responsive to coded data | Tetsu Watanabe | 1993-04-06 |
| 5189650 | Magneto-optical signal reproducing apparatus in which reproduced magneto-optical signal level is compared with reference signal level varied in accordance with in-phase signal | Tetsu Watanabe, Tetsuji Kawashima | 1993-02-23 |
| 5170385 | Recording medium with unembossed area indicating sector divisions | Susumu Senshu, Shigeaki Wachi, Tetsu Watanabe | 1992-12-08 |
| 5155485 | Digital modulating apparatus and digital demodulating apparatus | Yoichiro Sako | 1992-10-13 |