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| Number | Title | Issue Date |
| 6694683 | Sight glass retainer system and method for making same A sight glass retaining system is provided for mounting a sight glass to a support panel, such as for viewing combustion or other processes. The system includes a retainer which forms a continuous frame and has lateral flanges for locating the sight glass... | 02/24/2004 |
| 6247919 | Intelligent burner control system An intelligent burner control apparatus is configured to control the flow rate of a fluid flowing from a fluid supply to a burner. The apparatus includes a flow controller, a flow regulator, and a flow monitor. The flow controller includes a sensor config... | 06/19/2001 |
| 4880376 | Method and apparatus for monitoring and calibrating damper position Damper position of a damper in a heating system is monitored. The damper is movable between end positions in response to movement of a motor shaft. The motor shaft moves in response to a movement request signal. A shaft position signal is received by a po... | 11/14/1989 |
