Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9550249 | High power factor rectifier/filter for three phase input welder or plasma cutter | Roger Chamberlin | 2017-01-24 |
| 6794601 | Plasma arc torch system with pilot re-attach circuit and method | Roger Chamberlin, David Morrie | 2004-09-21 |
| 6670572 | Solenoid control and safety circuit system and method | David A. Tatham, Roger W. Hewett | 2003-12-30 |
| 6369350 | Plasma-arc torch system with pilot re-attach circuit and method | — | 2002-04-09 |