Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6994244 | Exothermic welding | Spencer Heynis, Mark S. Harger | 2006-02-07 |
| 6486402 | Cable grounding clamp | Spencer Heynis, Lloyd Lewallen | 2002-11-26 |
| 6382496 | Welding handle clamp | — | 2002-05-07 |