Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5740168 | Method and apparatus for switching radio links in mobile communication | Takehiro Nakamura, Narumi Umeda | 1998-04-14 |
| 5673260 | Method and system for CDMA mobile communication | Narumi Umeda, Akihiro Higashi, Akira Kaiyama | 1997-09-30 |