Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4819194 | Coordinate inputting system with provision for erroneous input detection | Haruyuki Koizumi, Hideki Sato, Shinichi Hashizume | 1989-04-04 |
| 4801767 | Coordinate inputting sheet with auxiliary electrodes promoting accuracy of positional detection | Hideki Sato, Haruyuki Koizumi, Shinichi Hashizume | 1989-01-31 |