Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8897442 | Encryption device, decryption device, encryption method, decryption method, program, and recording medium | — | 2014-11-25 |
| 8515060 | Encryption apparatus, decryption apparatus, encryption method, decryption method, security method, program, and recording medium | Koutarou Suzuki | 2013-08-20 |
| 8001384 | Authentication system, authentication method, attesting device, verification device, their programs, and recording medium | Go Yamamoto | 2011-08-16 |
| 5901229 | Electronic cash implementing method using a trustee | Tatsuaki Okamoto, Kazuo Ohta | 1999-05-04 |
| 5889862 | Method and apparatus for implementing traceable electronic cash | Kazuo Ohta, Atsushi Fujioka, Masayuki Abe | 1999-03-30 |