Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6828959 | Method and device for inputting coordinate-position and a display board system | Tsutomu Ogasawara, Takahiro Ito | 2004-12-07 |
| 6823481 | Optical coordinate input/detection device with optical-unit positioning error correcting function | — | 2004-11-23 |