Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7059606 | Game playing methods and game piece stack formations for playing same | Stephen W. Butcher, David Grebler, Robert Grebler | 2006-06-13 |
| 6702291 | Stacking block game | Robert Grebler | 2004-03-09 |
| 6679496 | Activity-directed stacking piece game | Robert Grebler, Amanda Birkinshaw | 2004-01-20 |
| 5611544 | Stacking brick tower game | Robert Grebler, James E. Sheftel | 1997-03-18 |