Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6191911 | Positioning apparatus for hard disk servowriter | Weidong Zhou | 2001-02-20 |
| 5825023 | Auto focus laser encoder having three light beams and a reflective grating | Jihua Zhang | 1998-10-20 |
| 5757491 | Laser interferometer system for straightness measurements | Jihua Zhang | 1998-05-26 |