Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D266186 | Heater | James F. Mariol | 1982-09-14 |
| 4302663 | Control system for a heater | Carl R. Pittman | 1981-11-24 |
| 4240401 | Fireplace heat exchanger | Albert J. Parrigin | 1980-12-23 |
| D254388 | Combined grate and fireplace heat exchanger | Albert J. Parrigin | 1980-03-04 |