Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5003717 | Changeable information scroll sign | Charles E. Trame, Robert A. Karsten | 1991-04-02 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5003717 | Changeable information scroll sign | Charles E. Trame, Robert A. Karsten | 1991-04-02 |