Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5958174 | Manufacture of telephone debit cards | E. Douglas Ramsberg, Gerald C. Krahn, Ralph F. Irelan, John L. Wantz, Eric Patterson | 1999-09-28 |
| 5650209 | Manufacture of telephone debit cards | E. Douglas Ramsburg, Gerald C. Krahn, Ralph F. Irelan, John L. Wantz, Eric Patterson | 1997-07-22 |