Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9705903 | Call control device, call control method, and call control system | Hiromitsu Kajiyama, Shigehiko Hirata, Hideo Okawa, Akio Koga | 2017-07-11 |
| 9621599 | Communication system, communication method, and call control server | Hiromitsu Kajiyama, Shigehiko Hirata | 2017-04-11 |
| 7821989 | Call management method, call management system and message processing server system | Hiroyasu Hayashida, Kaori Chigusa | 2010-10-26 |