Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5407356 | Pictorial image transforming manipulative-with multiple channel tracks | — | 1995-04-18 |
| 5281145 | Pictorial image transforming manipulatives | — | 1994-01-25 |
| D274411 | Protractor | — | 1984-06-26 |
| D273769 | Ruler | — | 1984-05-08 |
| D271667 | Protractor | — | 1983-12-06 |
| D271381 | Sine template | — | 1983-11-15 |
| D267932 | Protractor | — | 1983-02-15 |
| D267725 | Point plotting guide | — | 1983-01-25 |