Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5667250 | Game ticket confusion patterns | Mark Tevis, Bradley W. Walton, Stanley Litman | 1997-09-16 |
| 5641167 | Instant bingo game card | Mark Tevis | 1997-06-24 |
| 5599046 | Lottery ticket structure with circuit elements | Kenneth E. Irwin, Jr., Mark Tevis | 1997-02-04 |