Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5686725 | Method for reading of invisible marking | Tsutomu Maruyama, Atsushi Akiyama, Hiroyasu Matsuki, Sadao Chigira, Masanobu Hidaka | 1997-11-11 |
| 5684522 | Method of recording information on ferroelectric material using polarization | Ryoichi Yamamoto, Shizuo Umemura | 1997-11-04 |