Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7509149 | Method and apparatus for changing a sound source of a supplementary service using a ring back tone on calling | Jae Wook Shim, Hee Jung Ahn, Gil-soo Lee | 2009-03-24 |