Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8412184 | Communication switching method in communication system | Keiichi Nakatsugawa, Junichi Suga | 2013-04-02 |
| 7698436 | IP connection processing device | Keiichi Nakatsugawa, Yuji Matsumoto | 2010-04-13 |
| 7554950 | Handover method and mobile communication system and mobile terminal using same | Keiichi Nakatugawa, Ryuichi Takechi, Hideaki Ono | 2009-06-30 |