Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5051220 | Method for the manufacture of a heating element | Conrad Zellweger | 1991-09-24 |
| 4583940 | Igniter for combustible material | Conrad Zellweger | 1986-04-22 |
| 4506654 | Heating device | Conrad Zellweger | 1985-03-26 |