Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8144659 | Handover processing system in mobile communication system | Keiji Yamamoto | 2012-03-27 |
| 8093988 | Entry control system and entry control method | Kouichi Takene, Kimito Idemori, Koichi Ikeda, Yoshiro Seki, Keiji Yamamoto +1 more | 2012-01-10 |
| 8068480 | Handover processing system in mobile communication system | Keiji Yamamoto | 2011-11-29 |