Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7720227 | Encryption method for SIP message and encrypted SIP communication system | Tadashi Kaji, Osamu Takata, Kazuyoshi Hoshino | 2010-05-18 |
| 7697692 | Cryptographic communication system and method | Osamu Takata, Tadashi Kaji, Kazuyoshi Hoshino | 2010-04-13 |
| 7657035 | Encryption communication method and system | Akifumi Yato, Tadashi Kaji, Osamu Takata, Kazuyoshi Hoshino | 2010-02-02 |
| 7558952 | Method and apparatus for accelerating public-key certificate validation | Yoko Kumagai, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono | 2009-07-07 |
| 7533269 | Digital-signed digital document exchange supporting method and information processor | Yoko Kumagai, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono | 2009-05-12 |
| 7443986 | Key allocating method and key allocation system for encrypted communication | Osamu Takata, Tadashi Kaji, Kazuyoshi Hoshino | 2008-10-28 |
| 7409551 | Certificate validity authentication method and apparatus | Satoru Tezuka, Yoko Kumagai, Tomoharu Morio, Yutaka Miyazaki | 2008-08-05 |
| 7409553 | Public key certificate generation method, validation method and apparatus thereof | Yoko Kumagai, Satoru Tezuka, Takanobu Oikawa, Izumi Anayama | 2008-08-05 |
| 7392380 | Authentication and authorization infrastructure system with CRL issuance notification function | Tadashi Kaji, Yoko Kumagai, Shingo Hane, Hiromi Nagano | 2008-06-24 |
| 7080251 | Certificate validity authentication method and apparatus | Satoru Tezuka, Yoko Kumagai, Tomoharu Morio, Yutaka Miyazaki | 2006-07-18 |
| 6360247 | Information processing system, communication method, and recording medium | Susumu Matsui, Yasuhiro Takahashi, Taro Saito | 2002-03-19 |
| 5907676 | Information processing system, communication method, and recording medium | Susumu Matsui, Yasuhiro Takahashi, Taro Saito | 1999-05-25 |
| 5521633 | Motor vehicle obstacle monitoring system using optical flow processing | Masato Nakajima, Norio Kitamura, Kazuyuki Sasaki, Takahiro Oikawa, Kouji Ishii | 1996-05-28 |