Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874166 | Skill action game with a tiltable housing and an alarm producing disturbance sensor | — | 1989-10-17 |
| 4863172 | Front and back grids comprising puzzle with movable squares | Donald A. Rosenwinkel, John V. Zaruba | 1989-09-05 |
| 4798455 | User reconfigurable novelty glasses | Craig S. Yoe, Michael R. Gibson, Dennis O'Patka | 1989-01-17 |