Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8098672 | Internet telephone system ensuring communication quality and path setting method | Kazuhiko Sugiyama | 2012-01-17 |
| 7336603 | Internet telephone system ensuring communication quality and path setting method | Kazuhiko Sugiyama | 2008-02-26 |