Issued Patents All Time
Showing 26–35 of 35 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4796246 | Method and apparatus for beam-track alignment in optical disk apparatus | Takeshi Mada | 1989-01-03 |
| 4785442 | Light spot position control system and method by sampling servo | Masatoshi Ohtake, Seiji Yonezawa, Wasao Takasugi, Takashi Takeuchi | 1988-11-15 |
| 4748609 | Method and apparatus for composite tracking servo system with track offset correction and rotary optical disc having at least one correction mark for correcting track offset | Seiji Yonezawa, Masatoshi Ohtake, Masaru Ito, Kazuo Ichino, Harushige Nakagaki | 1988-05-31 |
| 4748611 | Information recording medium and method for reproducing the same | Masatoshi Otake, Sachio Kumagai, Kazuo Ichino, Wasao Takasugi, Seiji Yonezawa | 1988-05-31 |
| 4710909 | Phase compensation apparatus for an optical information recording and reproducing system | Seiji Yonezawa, Masuo Kasai, Motoo Uno | 1987-12-01 |
| 4707816 | Method and apparatus for composite wobbled and push-pull tracking servo system | Seiji Yonezawa, Masatoshi Ohtake, Masaru Ito, Kazuo Ichino, Harushige Nakagaki | 1987-11-17 |
| 4703408 | Apparatus and record carrier for optically writing information | Seiji Yonezawa, Yasunori Kanazawa | 1987-10-27 |
| 4564929 | Information recording and reproducing apparatus with tracking control by sampling | Seiji Yonezawa, Tatsuo Horikoshi, Wasao Takasugi | 1986-01-14 |
| 4541082 | Device for optically tracking information | Tatsuo Horikoshi, Seiji Yonezawa, Hiroshi Tooyama, Masatoshi Otake | 1985-09-10 |
| 4504937 | Optical information tracking apparatus | Seiji Yonezawa, Tatsuo Horikoshi | 1985-03-12 |