Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7945033 | Prepaid calling time processing: a method and apparatus for processing pre-paid calling time in a telephone communication system | — | 2011-05-17 |
| 7447300 | Prepaid calling time processing: a method and apparatus for processing pre-paid calling time in a telephone communication system | — | 2008-11-04 |
| 6707894 | Prepaid calling time processing: a method and apparatus for processing pre-paid calling time in a telephone communication system | — | 2004-03-16 |