Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4354842 | System for utilizing interactive blocks to teach arithmetic | Blair F. Baldwin, Donald Gorgas | 1982-10-19 |
| 4212117 | System of interactive blocks | Blair F. Baldwin | 1980-07-15 |
| 4212118 | System of interactive blocks | Blair F. Baldwin | 1980-07-15 |