Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7016878 | Content sales period verifying system and content decryption key effective period verifying system | Makoto Yoshioka, Haruhiko Tsunoda, Kazuharu Hasegawa | 2006-03-21 |
| 5918215 | Content sales price accounting system and accounting method thereof | Makoto Yoshioka, Haruhiko Tsunoda, Kazuharu Hasegawa | 1999-06-29 |
| 5884280 | System for and method of distributing proceeds from contents | Makoto Yoshioka, Haruhiko Tsunoda, Kazuharu Hasegawa | 1999-03-16 |