Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D297437 | Mathematics teaching aid | — | 1988-08-30 |
| D291900 | Rack for holding cards used in teaching mathematics | — | 1987-09-15 |
| 4645461 | Method for structurally differentiating polynomial functions | — | 1987-02-24 |
| 4632661 | Methods for structurally performing differential calculus | — | 1986-12-30 |