Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4985623 | Diffraction-type optical encoder with improved detection signal insensitivity to optical grating gap variations | Souji Ichikawa, Hideki Oka, Seiji Sakagami | 1991-01-15 |
| 4983825 | Diffraction type optical encoder with improved detection signal insensitivity to optical grating gap variations | Souji Ichikawa, Hideki Oka, Seiji Sakagami | 1991-01-08 |
| 4943716 | Diffraction-type optical encoder with improved detection signal insensitivity to optical grating gap variations | Souji Ichikawa, Hideki Oka, Seiji Sakagami | 1990-07-24 |