Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6744978 | Small diameter low watt density immersion heating element | Clifford D. Tweedy | 2004-06-01 |
| 6539171 | Flexible spirally shaped heating element | Clifford D. Tweedy, Keith Laken, David Adank | 2003-03-25 |