Famous Patents
The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7428901 | Cooking stove A cooking stove that prevents the execution of a process such as ignition of a burner when a touch switch changes from a non-sensing state to a sensing state. In STEP201, when a first touch switch, which is one of the touch switches provided in an operation, ... | 09/30/2008 |
| 7314370 | Automated operation check for standing valve A method of verifying proper operation of an electromagnetic valve. The method includes providing a mechanism to effect opening of the valve, verifying that the valve opened as a result of employing the mechanism to effect opening of the valve and after verifying th... | 01/01/2008 |
| 7233473 | Protection circuit and method for floating power transfer device A protection circuit and method are provided for a floating power transfer device having one or more switches for controlling charging of a reservoir capacitor across which a load is applied when in use. The protection circuit includes a control circuit, a fault det... | 06/19/2007 |
| 7044729 | Gas burner control for a bake oven The system (1) for controlling the combustion (7) of a cooking oven burner (2), comprises in combination a thermostat valve (3) with a rotary hand knob (4) and a non-electric temperature sensor (6) for modulating the burner ... | 05/16/2006 |
| 7008217 | Safety device for boiler comprising a time delay protected by an electronic circuit A safety device for an industrial boiler (CHA) including electromechanical relays (REn, RS), which are connected in series in order to form an electromechanical safety chain (CH1), and at least one shunt relay (RTn) which is normally ope... | 03/07/2006 |
| 6494707 | Limited recycle for primary controls An oil burner control system is disclosed in which recycling between a loss of combustion to re-establishment of combustion is limited by counting the number of times recycling occurs and causing a the system to stop recycling and go to lockout after the ... | 12/17/2002 |
| 6478573 | Electronic detecting of flame loss by sensing power output from thermopile An apparatus for and method of rapidly detecting a flame out condition. A thermopile receives heat energy from the flame and generates electrical power to enable operation of a microprocessor. This microprocessor periodically measures the output voltage o... | 11/12/2002 |
| 6322352 | Gas burner system A stove burner safety system has an electromagnetic valve and a manual gas cock controlling the gas flow to the burner and a spark plug adjacent the burner which receives a spark pulse from the electric circuitry which also controls an electromagnetic val... | 11/27/2001 |
| 5403183 | Device for automatic reignition of an extinguished burner flame A device for automatic reignition of an extinguished gas flame in a burner. The burner (10) is connected to a gas source via a security valve (13) operated to its closed position by the action of spring means. By magnetic means the security valve can be k... | 04/04/1995 |
| 5364260 | Fuel control system, control means therefor and methods of making the same A fuel control system, a control unit therefor and methods of making the same are provided, the system comprising a control unit that reduces the length of the warm-up time period of an igniter in subsequent successive burner cycles in which ignition is s... | 11/15/1994 |
| 5269458 | Furnace monitoring and thermostat cycling system for recreational vehicles and marine vessels Recreational vehicles and marine vessels provide for cabin environment heating by a thermostatically controlled furnace which is typically fueled by a portable supply of liquefied petroleum gas and electrically powered by an on board battery. The inventio... | 12/14/1993 |
| 5085573 | Hot surface ignition system for a gas furnace, control device therefor and methods of making the same A hot surface ignition system for a gas furnace or the like, control device therefor and methods of making the same are provided, the system comprising a burner, a settable thermostat, an electrically operable gas valve, a control unit, and an electricall... | 02/04/1992 |
| 5026270 | Microcontroller and system for controlling trial times in a furnace system A microcontroller and system allowing for more than one trial time in a furnace system, while using only one pin of the microcontroller. An alternating current signal at an input port of the microcontroller causes the microcontroller to allow a first long... | 06/25/1991 |
| 5003960 | Electronic grill control The electronic grill control employs a microprocessor-based circuit which monitors cooking temperature, cooking time, fuel level and the presence or absence of flame. The fuel level may be displayed alternately as a percentage or fraction of the full tank... | 04/02/1991 |
| 4997361 | Hot surface direct ignition system for gas furnaces A low cost hot surface ignition system particularly adapted for use in gas furnaces and the like, the system including low voltage control and timing circuitry effective to control a gas valve and high voltage ignition circuitry incorporating a hot surfac... | 03/05/1991 |
| 4976605 | Hot surface ignition system for a gas furnace, control device therefor and methods of making the same A hot surface ignition system for a gas furnace or the like, control device therefor and methods of making the same are provided, the system comprising a burner, a settable thermostat, an electrically operable gas valve, a control unit, and an electricall... | 12/11/1990 |
| 4925386 | Fuel burner control system with hot surface ignition A gas burner control system includes an electrical resistance igniter, gas valve means, and a microcomputer and related circuitry. The microcomputer and related circuitry control energizing of the igniter in such a manner so that the igniter, after succes... | 05/15/1990 |
| 4856983 | Hot surface direct ignition system for gas furnaces A low cost hot surface ignition system particularly adapted for use in gas furnaces and the like, the system including low voltage control and timing circuitry effective to control a gas valve and high voltage ignition circuitry incorporating a hot surfac... | 08/15/1989 |
| 4850852 | Gas valve shut off method and apparatus Provision is made for sensing when the gas valve relay contacts are welded, or stuck, in the closed position and for responsively turning off the inducer motor when that occurs. This in turn causes the pressure switch to open to thereby cut off the power ... | 07/25/1989 |
| 4746284 | Hot surface direct ignition system for gas furnaces A low cost hot surface ignition system particularly adapted for use in gas furnaces and the like, the system including low voltage control and timing circuitry effective to control a gas valve and high voltage ignition circuitry incorporating a hot surfac... | 05/24/1988 |
| 4643668 | Hot surface direct ignition system for gas furnaces A low cost hot surface ignition system particularly adapted for use in gas furnaces and the like, the system including low voltage control and timing circuitry effective to control a gas valve and high voltage ignition circuitry incorporating a hot surfac... | 02/17/1987 |
| 4465455 | Start-up/shut-down for a hydrogen gas burner System for flame start-up/shut-down for a hydrogen gas mixture burner. An electrical probe igniter positioned adjacent the gas port outlet. On demand the igniter is actuated to heat and electrically heat a thermal switch. Responsive electronic controls ac... | 08/14/1984 |
| 4459099 | Fuel and ignition control A fuel and ignition control for a pulse combustion furnace includes both analog and digital timing means for fail safe operation, fuel valve control means which depend on proper cyclic operation for proper function, and flame detection means which are fai... | 07/10/1984 |
| 4452582 | Independent, self-contained electronic spark ignition recycler An electronic spark ignition system for a heating apparatus which does not have a means of attempting repeated ignition attempts if prior attempts at ignition fail is forced into a recycling mode by an independent, self-contained electronic spark ignition... | 06/05/1984 |
| 4445841 | Combustion control apparatus A combustion control apparatus in which a predetermined number of pre-purge and igniting cycles are repeated until ignition takes place successfully. A pre-purge time interval of the second and subsequent igniting cycles is selected shorter than that of t... | 05/01/1984 |
| 4429682 | Automatic safety gas heating device A valve rod of a gas heating device actuates not only a microswitch, but also a disc valve. A pilot burner and a main burner are separately controlled by individual solenoid operated valve which is serially connected. The disc valve is provided at the ups... | 02/07/1984 |
| 4415328 | Fuel and ignition control A fuel and ignition control for a pulse combustion furnace includes both analog and digital timing means for fail safe operation, fuel valve control means which depend on proper cyclic operation for proper function, and flame detection means which are fai... | 11/15/1983 |
| 4325689 | Automatic reset control for direct spark ignition systems A fuel ignition system for a heating apparatus includes a burner connected to a fuel supply, a valve for regulating the flow of fuel to the burner, an electrode assembly for producing a spark to ignite the fuel at the burner, an ignition system control mo... | 04/20/1982 |
| 4257758 | Safety arrangement in a gas operated apparatus A safety arrangement in a gas-operated apparatus, such as an absorption refrigerator, having a safety device that controls the gas system and, when required, automatically re-ignites the flame of the gas burner that has become extinguished. The system has... | 03/24/1981 |
| 4025284 | Pilot burner reignition system A reignition system for a gas burner especially well suited for employment in recreational vehicles, and the like, for operation directly from the vehicle's low voltage DC electrical power supply. A flyback pulse converter, switched by an SCR, converts th... | 05/24/1977 |
| 4015928 | Heating system Apparatus including an improved D.C. operated oscillator for an intermediate power source, a cooperating solenoid gas valve opening and safety shut-off circuit, and a spark igniter with automatic shut-down.... | 04/05/1977 |
| 3975136 | Burner control system A spark ignition circuit begins producing sparking pulses and a storage capacitor begins charging upon closure of a space thermostat. An electromagnetically operated valve controlling gas flow to a burner is energized sufficiently to open only upon discha... | 08/17/1976 |
| 3947220 | Fuel ignition control arrangement A control arrangement for igniting gaseous fuel supplied to a main burner of a fuel ignition system includes a spark producing circuit to ignite the gaseous fuel for establishing a flame at the main burner, a flame sensing circuit for detecting the presen... | 03/30/1976 |
