Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7956573 | Battery charging system with discharging means | — | 2011-06-07 |
| 5699620 | Apparatus for sharpening crayon marking instruments to form an improved arcuate safety marking tip | Frederick B. Hadtke, Linda El-Fakir | 1997-12-23 |