Issued Patents 2004
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6760418 | Method and apparatus for providing pre-pay and post-pay communication services using a switching system to monitor call duration | Minh Duy Khuc, Carl Rogers, Isaac Shane Allen, Dan Sbisa | 2004-07-06 |