Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5452274 | Sound-activated playback device | — | 1995-09-19 |
| 5178545 | Electronic puzzle game with unknown random time of play | — | 1993-01-12 |
| 4961579 | Electronic puzzle game | Russell D. Bingham, William A. Holmes | 1990-10-09 |
| 4959017 | Electronic learning device for teaching how to handle money | Jesse Ursery, Jr. | 1990-09-25 |
| 4799890 | Electronic learning device for teaching how to tell time | Ashok Dittakavi | 1989-01-24 |
| 4505682 | Learning aid with match and compare mode of operation | — | 1985-03-19 |
| 4457719 | Electronic learning aid for providing sequencing and spelling exercises | Ashok Dittakavi | 1984-07-03 |