Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8391112 | Optical disk apparatus, control method, and program | Yasushi Tomita, Takamichi Yamakoshi | 2013-03-05 |
| RE38538 | Apparatus and method for recording and reproducing information from a plurality of recording medium having different thicknesses and recording densities | Akio Yamakawa | 2004-06-22 |
| 6366543 | Optical pickup for discriminating between and reading different types of optical discs | Kiyoshi Ohsato, Akio Yamakawa, Masamichi Utsumi | 2002-04-02 |
| 6222803 | Optical pickup for discriminating between and reading different types of optical discs | Kiyoshi Ohsato, Akio Yamakawa, Masamichi Utsumi | 2001-04-24 |
| 5875164 | Apparatus and method for recording and reproducing information from a plurality of recording medium having different thickness and recording densities | Akio Yamakawa | 1999-02-23 |
| 5737294 | Objective lens with two numerical apertures for reading/writing two optical discs | Akio Yamakawa | 1998-04-07 |
| 5442615 | Optical plate for correcting comatic aberration | Kiyoshi Ohsato, Naoya Eguchi | 1995-08-15 |