Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4838638 | Optical wavelength conversion device | Yoji Okazaki | 1989-06-13 |
| 4830447 | Optical wavelength conversion device | Yoji Okazaki, Masaki Okazaki, Seiiti Kubodera, Syozo Takeuchi | 1989-05-16 |
| 4830448 | Light modulator and wave guide device | Yoji Okazaki, Hiroshi Sunagawa | 1989-05-16 |
| 4820011 | Optical wavelength conversion device, and a method of making the same | Shinsuke Umegaki, Yoji Okazaki | 1989-04-11 |
| 4797867 | Pick-up head for optical information storage disk | Hiroshi Sunagawa | 1989-01-10 |