Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6463139 | Combination pre-paid and calling card | Michael Davitt, Leonard Matulewski | 2002-10-08 |
| 6137872 | Combination pre-paid and calling card | Michael Davitt, Leonard Matulewski | 2000-10-24 |