Issued Patents All Time
Showing 51–67 of 67 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5966448 | Cryptographic communication system | Hikari Namba, Satoshi Miyazaki | 1999-10-12 |
| 5465299 | Electronic document processing system and method of forming digital signature | Hiroshi Matsumoto, Seiichi Susaki, Hiroyuki Maezawa, Shinobu Koizumi | 1995-11-07 |
| 5351294 | Limited broadcast system | Hiroshi Matsumoto, Yasuko Fukuzawa | 1994-09-27 |
| 5315634 | Automatic trading method and apparatus | Kazuaki Tanaka, Takeshi Matsuki | 1994-05-24 |
| 5309516 | Group cipher communication method and group cipher communication system | Seiichi Susaki, Hiroshi Matsumoto, Tsutomu Nakamura | 1994-05-03 |
| 5280583 | System and method for performing interlocution at a plurality of terminals connected to communication network | Yoshiyuki Nakayama, Kenjiro Mori, Singi Domen | 1994-01-18 |
| 5235641 | File encryption method and file cryptographic system | Masafumi Nozawa, Akinobu Shimada, Toshifumi Nishimura, Katsuharu Kakuse, Tokuhiro Tsukiyama +4 more | 1993-08-10 |
| 5222139 | Cryptographic method and apparatus | Tsutomu Nakamura, Masahiro Yamashita, Kazuo Hashimoto, Hiroshi Matsumoto | 1993-06-22 |
| 5218638 | Encipher method and decipher method | Hiroshi Matsumoto, Yasuko Fukuzawa | 1993-06-08 |
| 5144665 | Cryptographic communication method and system | Yasuhiro Ishii, Tsutomu Nakamura | 1992-09-01 |
| 5117458 | Secret information service system and method | Ryoichi Sasaki, Tsutomu Nakamura, Minoru Koizumi, Yasuko Fukuzawa, Kenji Kataoka | 1992-05-26 |
| 5103479 | Encipher method and decipher method | Fusao Nakagawa, Ryoichi Sasaki | 1992-04-07 |
| 5018196 | Method for electronic transaction with digital signature | Ryoichi Sasaki | 1991-05-21 |
| 4982429 | Encipher method and decipher method | Fusao Nakagawa, Ryoichi Sasaki | 1991-01-01 |
| 4969190 | Encrypting system of data | Fusao Nakagawa, Yasuhiko Nagai, Ryoichi Sasaki | 1990-11-06 |
| 4885777 | Electronic transaction system | Ryoichi Sasaki, Takayoshi Shiraishi, Nobuhiro Kurashiki | 1989-12-05 |
| 4885788 | IC card | Takayoshi Shiraishi, Ryoichi Sasaki | 1989-12-05 |