Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5373440 | Promotional game method and apparatus therefor | Leopold Cohen, Robert T. Grindell | 1994-12-13 |
| 5231568 | Promotional game method and apparatus therefor | Leopold Cohen, Robert T. Grindell | 1993-07-27 |