Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7427066 | Puzzle apparatus with audible sounds | — | 2008-09-23 |
| 6979245 | Puzzle apparatus with audible sounds | — | 2005-12-27 |
| 6132149 | Twist drills | Bertram Victor Howarth | 2000-10-17 |
| 5795213 | Reading toy | — | 1998-08-18 |
| 5788554 | Plush puzzle toy | Ralph Bernet | 1998-08-04 |
| 5600433 | Optical fiber waist refractometer | Daniel A. Buttry, Thomas C. Vogelmann, Guoying Chen | 1997-02-04 |