Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5555232 | Optical head with built-in semiconductor laser, objective lens and 1/4 wavelength plate | Shohei Kobayashi, Takeshi Yamazaki, Tsuneo Yanagida, Toshihiro Ogata | 1996-09-10 |
| 4728188 | Light source degeradation detecting apparatus for laser device | Seizi Kitagawa, Shozi Yoshikawa | 1988-03-01 |
| D288558 | Optical pickup for use in optical discs | Nobuhide Matsubayashi, Tsuneo Yanagida, Masaharu Sakamoto | 1987-03-03 |
| 4574371 | Apparatus for recording and reproducing information on an optical disc | Kiichi Kato, Masaharu Sakamoto | 1986-03-04 |