Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5915960 | Direct gas-fired heating and ventilation system with passive control damper | Chris B. Check, Bruce Knieriem | 1999-06-29 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5915960 | Direct gas-fired heating and ventilation system with passive control damper | Chris B. Check, Bruce Knieriem | 1999-06-29 |