Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5249800 | Progressive gaming control and communication system | Douglas N. Hilgendorf | 1993-10-05 |
| 4727544 | Memory integrity checking system for a gaming device | Norman Brunner, Douglas N. Hilgendorf | 1988-02-23 |
| 4711451 | Reel mapping scheme for a gaming device | Victor L. Salmons, Tony Chan | 1987-12-08 |