Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6801607 | System and method for preventing fraudulent calls using a common billing number | Erin C. Jackman, Ron Zimmerman | 2004-10-05 |
| 6782083 | ISN call interrupt | Arthur Lance Springer, Jeffrey D. Cahill, David K. Vognsen | 2004-08-24 |