Issued Patents 2019
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10523812 | Method and system for providing ringback tone service and ringtone service in Voice over Internet Protocol (VoIP) call service | Deok Yong Ahn, Keum Ryong Kim, Tae Jeong LEE, Jaehyun Lee, Min Jeong Kim +4 more | 2019-12-31 |