Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4299185 | Device for warning of impending roof-fall in underground excavations | William R. Heffernan, Mary-Louise Vega | 1981-11-10 |
| 4186426 | Emergency lighting device | William R. Heffernan, Mary-Louise Vega, Michael T. Beachem | 1980-01-29 |
| 4184193 | Multi-purpose lantern | William R. Heffernan, Mary-Louise Vega | 1980-01-15 |