Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5253429 | Levelling method and apparatus | Yoshishige Konno, Yooichi Toita | 1993-10-19 |
| 5048326 | Surface roughness measuring instrument | Yoichi Toida | 1991-09-17 |
| 4888984 | Levelling device of roughness measuring machine | Yoichi Toida, Masatsugu Nemoto, Junichi Iida, Kenji Sakuma | 1989-12-26 |