Issued Patents 2021
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11201898 | SIP proxy server, communication method and SIP proxy program | Kenjiro Arai | 2021-12-14 |
| 11012478 | Communication method and communication program | Kenjiro Arai, Kenichi Hiragi | 2021-05-18 |