Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7222108 | Electronic cash implementing method and equipment using user signature and recording medium recorded thereon a program for the method | Tatsuaki Okamoto | 2007-05-22 |
| 6539364 | Electronic cash implementing method and equipment using user signature and recording medium recorded thereon a program for the method | Tatsuaki Okamoto | 2003-03-25 |
| 6377692 | Method and system for controlling key for electronic signature | Yoshio Takahashi | 2002-04-23 |
| 6260027 | Electronic ticket system, collecting terminal, service providing terminal, user terminal, electronic ticket collecting method and recording medium | Yoshio Takahashi | 2001-07-10 |