Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D727322 | Computer detectable manipulative | William G. Gridley | 2015-04-21 |
| D727323 | Computer detectable manipulative | William G. Gridley | 2015-04-21 |
| D726722 | Computer detectable manipulative | William G. Gridley | 2015-04-14 |
| D726723 | Computer detectable manipulative | William G. Gridley | 2015-04-14 |