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| Number | Title | Issue Date |
| 7225746 | Low NOx combustion Combustion of hydrocarbon liquids and solids is achieved with less formation of NOx by feeding a small amount of oxygen into the fuel stream. ... | 06/05/2007 |
| 7176805 | System for controlling ignition sources when flammable gas is sensed Upon detection of a flammable gas condition, an intelligent thermostat regulates operation of appliances that have sources of ignition which could be the source of or may ignite the flammable gas. This hazardous condition is detected by a flammable gas detector and ... | 02/13/2007 |
| 7112059 | Apparatus and method for shutting down fuel fired appliance An apparatus is provided for controlling the operation of a gas fired appliance having a gas valve circuit for enabling the flow of gas to the burner. The apparatus comprises a sensor capable of detecting the presence of flammable vapor, a switching means in series ... | 09/26/2006 |
| 7083408 | Apparatus and method for shutting down a fuel fired appliance An apparatus comprising a switch, a fuse, and a sensor that is capable of detecting the presence of flammable vapors and responsively changing in resistance, wherein the sensor enables the switch to supply current to the fuse which opens to shut down an appliance bu... | 08/01/2006 |
| 7048537 | Apparatus and method for controlling a variable fuel fired appliance An apparatus is provided for controlling a fuel fired heating appliance, the apparatus comprising a first processor for controlling the ignition operation of the furnace and a second processor for controlling the operation of a variable speed blower motor, wherein t... | 05/23/2006 |
| 7039555 | Method for detecting heat exchanger tube failures and their location when using input/loss performance monitoring of a recovery boiler This invention relates to a recovery boiler as used by the pulp and paper industry burning black liquor, and, more particularly, to a method for rapid detection of tube failures and the location of the affect heat exchanger within the recovery boiler, without need f... | 05/02/2006 |
| 6978726 | Combustion with reduced carbon in the ash Combustion of coal in which oxygen is injected into the coal as it emerges from burner produces ash having reduced amounts of carbon. ... | 12/27/2005 |
| 6973819 | Differential compensated vapor sensor Vapor sensing systems and methods are disclosed. An appliance such as a gas water heater, clothes dryer, and the like can be associated with a controller for controlling the appliance. A vapor sensor is also associated with the appliance, such that the vapor sensor ... | 12/13/2005 |
| 6920377 | Self-sustaining control for a heating system A self-sustaining control for a heating system, having conventional operational modes and pilot burner assembly, is disclosed. A controller directs operation in accordance with a need-based protocol and monitors the condition of a storage device, which provides syst... | 07/19/2005 |
| 6908300 | Apparatus and method for shutting down a fuel fired appliance An apparatus comprising a switch, a fuse, and a sensor that is capable of detecting the presence of flammable vapors and responsively changing in resistance, wherein the sensor enables the switch to supply current to the fuse which opens to shut down an appliance bu... | 06/21/2005 |
| 6745152 | Method for detecting heat exchanger tube failures when using input/loss performance monitoring of a power plant This invention relates to a fossil-fired thermal system such as a power plant or steam generator, and, more particularly, to a method for rapid detection of tube failures without direct instrumentation, thereby preventing serious damage to heat exchangers. This meth... | 06/01/2004 |
| 6739865 | System and method for disabling a furnace A system and method for disabling an oil furnace based on a vacuum level measurement. The oil furnace includes a pump and a burning device. The pump is adapted to transfer oil from a storage device to the burning device. A measurement device adapted to measure a vac... | 05/25/2004 |
| 6652266 | Flame sensor and method of using same A flame sensor for sensing the presence of a flame in a burner. The signal from the sensor is passed to an amplifier located adjacent to the sensor and amplified without having a sensor signal contaminated with common mode radiation. The selectively ampli... | 11/25/2003 |
| 6651035 | Method for detecting heat exchanger tube failures and their location when using input/loss performance monitoring of a power plant This invention relates to a fossil-fired thermal system such as a power plant or steam generator, and, more particularly, to a method for rapid detection of tube failures and their location with the steam generator, without need for direct instumentation,... | 11/18/2003 |
| 6339379 | Carbon monoxide detector A carbon monoxide detector for detecting the level of carbon monoxide in a furnace supply duct. The carbon monoxide detector includes a carbon monoxide detector that has a housing. The housing is coupled to an exterior surface of a furnace supply duct of ... | 01/15/2002 |
| 6164958 | Safety system for gas range A safety system for a gas burning device, such as a gas range having a plurality of burner assemblies. The safety system generally comprises a gas supply valve, a gas flow sensor, a gas leak warning circuit, a no-flame warning circuit, a gas supply valve ... | 12/26/2000 |
| 6045352 | Carbon monoxide automatic furnace shutdown system An automatic safety system for a fluid fuel air heating furnace. The safety system utilizes a double-sided carbon monoxide sensor for detecting unsafe levels of carbon monoxide interiorly and exteriorly of the furnace's heated air duct and a single-sided ... | 04/04/2000 |
| 5896089 | Dual carbon monoxide detection system with gas cut off and alarm capabilities A dual carbon monoxide detection system is provided including a gas furnace having a heat exchanger with a supply air duct for delivering heated air and a return air duct for receiving air to be heated. The gas furnace further has a gas input line for rec... | 04/20/1999 |
| 5866802 | Piping leakage detecting apparatus A piping leakage detecting apparatus includes a high pressure gas supply source, a gas implement connected to the high pressure gas supply source via a pipeline, and a switching device mounted on the pipeline for selectively opening and closing the pipeli... | 02/02/1999 |
| 5827950 | Leak test system A leak test system is disclosed for a double block and bleed valve arrangement, the system including a second vent valve disposed along the bleed line and a secondary gas supply line connected to the bleed line for introducing gas at a known pressure into... | 10/27/1998 |
| 5793296 | Apparatus for carbon monoxide detection and automatic shutoff of a heating system An apparatus for carbon monoxide detection and automatic shutoff of a heating system is provided which includes a single housing containing a thermostat, a carbon monoxide detector, and a control circuit serially connected to the heating system via the ex... | 08/11/1998 |
| 5567143 | Flue draft malfunction detector and shut-off control for oil burner furnaces Flue-draft-malfunction detector and shut-off control for oil burner furnaces automatically stops operation of the oil burner in event of flue draft malfunction and prevents further running operation of the oil burner until a meltable element in the contro... | 10/22/1996 |
| 5540273 | Method for controlling a heating unit This invention relates to a method and system for controlling a heating/air conditioning unit. More particularly, this invention relates to a control unit which detects the presence of one or more gases (e.g. CO, fuel, refrigerant or radon) produced by th... | 07/30/1996 |
| 5531214 | Gas vent and burner monitoring system A gas vent and burner monitoring system for monitoring a gas burner vent appliance. The system includes an alarm, a first sensor proximate the burner and a second sensor proximate the draft hood. Each sensor detects the occurrence of an event and the resp... | 07/02/1996 |
| 5503550 | Gas log fireplace system A gas-fired, simulated log fireplace insert incorporating an automatic flue damper for controlling the operational state of a chimney vent (open/closed) in response to gas combustion, an externally mounted carbon monoxide detector for terminating or inhib... | 04/02/1996 |
| 5477913 | System for controlling a heating/air conditioning unit This invention relates to a method and system for controlling a heating/air conditioning unit. More particularly, this invention relates to a control unit which detects the presence of one or more gases (e.g. CO, fuel, refrigerant or rador) produced by th... | 12/26/1995 |
| 5472336 | Flame rectification sensor employing pulsed excitation A flame rectification type flame sensor circuit and method in which a generator injects periodic pulses of alternating voltage into a flame region, the voltage across the flame region being processed by a filter/amplifier which, in proper operation, produ... | 12/05/1995 |
| 5318437 | Automatic system to feed burners with diesel or light fuel-oil From a fuel storage tank (13), a filter (1) is installed to prevent any obstruction, followed by a vacuum gauge (2) and a motor-driven pump (3) to deliver the fuel to the burner (12): immediately prior to said burner, there is a pressure relief valve (11)... | 06/07/1994 |
| 5307620 | Fuel gas burning control method A method of safely controlling a burning of a fuel gas in a combustor in response to the pressure change in a fuel gas sealed in a fuel gas passage between a fuel gas supply source and the combustor communicated with the fuel gas supply source, the method... | 05/03/1994 |
| 5280802 | Gas appliance detection apparatus A first and second sensor and alarm member is mounted relative to a gas appliance, and more particularly to the diverter housing and adjacent a lower portion of the gas appliance for detection of spillage in the form of flue restriction relative to the fi... | 01/25/1994 |
| 5239980 | Forced air furnace control system and method of operation A forced air furnace control system for preventing the buildup of dangerous concentrations of CO gas within a building airspace. A CO sensor is mounted in the air exit plenum of the furnace and connected in a circuit which produces an output signal when t... | 08/31/1993 |
| 5143050 | Water heater heat rollout sensor A water heater comprising a combination chamber, a gas burner located in the combustion chamber, a gas inlet pipe communicating with the burner, a gas valve for opening and closing the inlet pipe, and a sensor which is in contact with the inlet pipe and w... | 09/01/1992 |
| 4986468 | Test circuit for system monitoring apparatus A gas fired burner includes a pilot gas valve and a burner gas valve sequentially operated to light the burner. A monitor includes individual monitoring of the status of the valves and the burner as well as other components and systems associated with the... | 01/22/1991 |
| 4978821 | Reverse flow prevention device for combustion apparatus A reverse flow prevention device for combustion apparatuses control operated by electrical power, and which is provided with a combustion gas discharge tube for discharging the combustion process by-product. The reverse flow device comprising a reverse fl... | 12/18/1990 |
| 4915613 | Method and apparatus for monitoring pressure sensors A method and apparatus monitor fuel pressure in a heating system where a controller controls actuation of fuel valves. A fuel pressure limit signal is provided to the controller for determining if the fuel pressure crosses predetermined thresholds. In ord... | 04/10/1990 |
| 4901678 | Heating boiler and method for operating same A fan forces air through an air inlet channel to a mixing chamber where it is mixed with fuel, and the mixture is then fed to a burner. The combustion products of the burner provide heat to a heat exchanger which is connected to a discharge channel. The c... | 02/20/1990 |
| 4902223 | Oxy-fuel burner for burning pulverized fuel The wall (5) of a tube (2) for delivering pulverized fuel to the outlet (4) of an oxy-fuel burner (1) forms part of a chamber (6) which is pressurized or evacuated. The pressure in the chamber is continuously monitored. If the pressure in the chamber (6) ... | 02/20/1990 |
| 4872828 | Integrated furnace control and control self test An integrated electronic control arrangement is disclosed in the illustrative environment of a gas-fired furnace. The control incororates a self-test feature which shuts down the furnace and displays a diagnostic fault code in the event of any one of a nu... | 10/10/1989 |
| 4865538 | Fail safe gas valve drive circuit A fail safe drive circuit for enabling the relay which in turn opens the valve for supplying gas to a burner is disclosed and includes a pair of field effect transistors both of which must be operating properly to enable the relay. One transistor receives... | 09/12/1989 |
| 4832594 | Control system with timer redundancy A fail safe control circuit for supplying gas to a burner is disclosed and includes a plurality of timers, two of which set upper and lower bounds on a window or acceptable time interval during which a third timer must issue a control signal for that sign... | 05/23/1989 |
