Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6366543 | Optical pickup for discriminating between and reading different types of optical discs | Kamon Uemura, Kiyoshi Ohsato, Akio Yamakawa | 2002-04-02 |
| 6222803 | Optical pickup for discriminating between and reading different types of optical discs | Kamon Uemura, Kiyoshi Ohsato, Akio Yamakawa | 2001-04-24 |
| 5751679 | Hologram formed on an objective lens for one defracting light beams which are separated by more than one track width | Akio Yamakawa | 1998-05-12 |
| 5742575 | Method and device for identifying disc | Akio Yamakawa | 1998-04-21 |
| 5682372 | Method and apparatus for playing back multilayer disk | Akio Yamakawa, Tetsuo Usui | 1997-10-28 |