Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5650209 | Manufacture of telephone debit cards | E. Douglas Ramsburg, Gerald C. Krahn, Jeffrey S. Walter, Ralph F. Irelan, John L. Wantz | 1997-07-22 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5650209 | Manufacture of telephone debit cards | E. Douglas Ramsburg, Gerald C. Krahn, Jeffrey S. Walter, Ralph F. Irelan, John L. Wantz | 1997-07-22 |