Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5670074 | Heating system shut-off system with radio/ultrasound communication between detector and existing safety switch or fuel valve | Carl F. Kass | 1997-09-23 |
| 5189392 | Heating system shut-off system using detector and existing safety switch or fuel valve | Carl E. Kass | 1993-02-23 |