Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5999339 | Hand-held magnifying device | Wai Hing Kam, Yau Chung Siu | 1999-12-07 |
| D407423 | Slide viewer | Lonnie C. Pogue | 1999-03-30 |
| D400813 | Teaching scale | Tirza Ernst | 1998-11-10 |
| D379315 | Educational balance | Richard Woldenberg, Lonnie C. Pogue, Brian Macowski | 1997-05-20 |