Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5827067 | Method and apparatus for educating mathematical functions | — | 1998-10-27 |
| D395675 | Arithmetic instructional apparatus | — | 1998-06-30 |
| D394878 | Arithmetic instructional apparatus | — | 1998-06-02 |
| D392674 | Arithmetic instructional apparatus | — | 1998-03-24 |
| D392675 | Arithmetic instuctional apparatus | — | 1998-03-24 |