Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5599046 | Lottery ticket structure with circuit elements | Kenneth E. Irwin, Jr., Mark Tevis | 1997-02-04 |
| 5560610 | Instant bingo game card | Mark Tevis | 1996-10-01 |
| 5475205 | Document verification system | Bert Levy, Kenneth E. Irwin, Jr. | 1995-12-12 |
| 5451052 | Scratch-off game and game piece therefor | Terry D. Mangold, Howard D. Roath, Stephen Crocker | 1995-09-19 |
| 5346258 | Game ticket confusion patterns | Stanley Litman, Bradly W. Walton | 1994-09-13 |
| 4725079 | Lottery ticket integrity number | John R. Koza, Martin A. Keane | 1988-02-16 |