US3589847A - Ignition system - Google Patents
Ignition system Download PDFInfo
- Publication number
- US3589847A US3589847A US813593A US3589847DA US3589847A US 3589847 A US3589847 A US 3589847A US 813593 A US813593 A US 813593A US 3589847D A US3589847D A US 3589847DA US 3589847 A US3589847 A US 3589847A
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- Prior art keywords
- switch
- control
- burner
- control unit
- resistance
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- 230000007423 decrease Effects 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 4
- 230000002950 deficient Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/06—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs structurally associated with fluid-fuel burners
- F23Q7/10—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs structurally associated with fluid-fuel burners for gaseous fuel, e.g. in welding appliances
- F23Q7/12—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs structurally associated with fluid-fuel burners for gaseous fuel, e.g. in welding appliances actuated by gas-controlling device
Definitions
- Gas is ignited by a glow coil and a sensoror probe-type resistance unit imposes a control function to turn off the gas supply if the burner is not ignited within a predetermined time period.
- the sensor also closes the gas valve whenever the sensor is no longer heated.
- This invention relates to gas burner ignition and safety control systems and more in particular to a simplified electrical system for igniting gas burners and for cutting cutting off the gas supply whenever malfunctioning prevents the burner from operating.
- An object of this invention is to provide improved ignition systems for gas systems.
- a further object is to provide electrical control systems for gas burners which provide for efficient and dependable ignition and which prevents the objectionable results which occur when the equipment malfunctions.
- a further object is to provide inexpensive and simple control systems for gas burners and the like.
- FIGURE is a schematic representation of one embodiment of the invention.
- a burner 2 is supplied with gas through a valve 4 which is opened by the energization of a solenoid 24 but which closes automatically when the solenoid is deenergized.
- Electrical power is supplied through a pair of lines 5 and 6 which extend from a control switch represented schematically at 7.
- the closing of switch 7 supplies electrical power through lines 5 and 6 to an igniter circuit formed by the primary winding of a transformer 8, the secondary winding of which is connected directly to an igniter 10, which is in the form of a resistance heater.
- Power is also supplied through lines 5 and 6 to a gas supply circuit formed by a normally open switch 20, a normally closed switch 22 and a solenoid 24; and to a control circuit for switches 20 and 22.
- Switches 20 and 22 are the switches of two time-delay warpswitch relay units ll and 15, respectively, which have a control circuit connected across lines 5 and 6 with a resistance unit 12 and two resistance units or heaters 14 and 16.
- Relay unit 11 includes resistance heater 14 and a warp strip 13 heated thereby and operatively connected to switch 20; and, relay unit 15 is similar with resistance heater l6 heating a warp strip 17 which operates switch 22.
- strips 13 and 17 g are at'room temperature, switch is open and switch 22 is closed; and, the heating of these strips by the full energization of their resistance heaters 14 and 16 causes warp strip 13 to close switch 20, and causes warp strip 17 to open switch 22.
- the control circuit for switches 20 and 22 also includes a probe or sensor or resistance unit 18 which is connected in parallel with resistance heater 16 and which has a negative resistance-temperature characteristic.
- unit 18 When the burner is not ignited, unit 18 is at room temperature and has relatively high resistance, however, when burner has ignited, resistance drops to a much lower level. This variation in the resistance of unit 18 is used as a basic control feature, based upon the high resistance detecting that the burner is not ignited.
- the control circuit formed by resistance units 16 and 18 in parallel and thence in series with resistance units 12 and 14, has a constant voltage impressed across it when switch 7 is closed.
- switch 7 When burner 2 is not ignited, there is a predetermined distribution of that voltage into voltages across unit 12, unit 14 and the parallel circuit of units 16 and 18.
- the resistance of the parallel circuit of units 16 and 18 is reduced and there is a different distribution of the voltage with a greater voltage across each of units 12 and 14 and a lesser voltage across units 16 and 18.
- the change in the relative resistances of units 16 and 18 causes unit 18 to shunt a high portion of the total current around unit 16.
- the characteristics of the circuit are such that when burner 2 is not ignited the voltage across unit 16 and the current flow therethrough will heat strip 17 sufficiently to open switch 22 at the end of the time-delay period of relay unit 15, but when burner 2 is ignited the voltage drop across unit 16 and the current flow therethrough is not sufficient to cause strip 18 to open switch 22.
- Relay unit 11 has a 3-second time-delay characteristic so that it closes switch 20 3 seconds after the closing of switch 7. During that 3-second interval or time-delay period, the energization of transformer 8 supplies current to heat igniter 10. The closing of switch 20 then completes a circuit through switch 22 to energize solenoid 24 which opens valve 4 and supplies gas to burner 2.
- the timedelay period for unit 15 is of the order of 15 seconds so that switch 22 opens only atter unit 16 has been fully energized for 12 seconds after switch 20 has closed. However, during that additional l2-second time-delay while the system is operating normally, burner 2 receives a proper supply of gas and is ignited and it heats sensor unit 18.
- the system acts as a lockout, thus preventing cycling of the type which occurs with some control systems where the gas is turned on and off without being ignited. Therefore, any malfunctioning which interferes with the operation as explained above prevents the burner from operating until it has received attention.
- any malfunctioning if either igniter 10 or unit 18 were to become improperly positioned or defective, the energizing of the control system would result in the opening of switch 22 and valve 4 'would be closed.
- the invention contemplates that a pilot flame could be used to ignite the burner, and a defective pilot flame would have the same effect.
- burner 2 is an infrared gas burner in a household appliance
- switch 7 is a standard type of manual switch, but can be a relay switch. It is understood that the illustrative embodiment is adaptable for different environments and the invention contemplates modified constructions and other arrangements within the scope of the claim.
- a sensing resistance element having a negative temperature-resistance characteristic which is positioned to be heated by the burner whereby its electrical resistance is decreased substantially when the burner is operating normally
- means constituting a supply of fuel to said burner including a solenoid operated valve means, a normally closed switch connected in series with said solenoid and providing electrical current therethrough to actuate said solenoid thereby to open said valve when said switch is closed, and a control unit operatively associated with said switch to open said switch, after a predetermined time delay period, when said control unit is energized, said control unit including means for operating said switch, said operating means being connected in parallel with said sensing resistance element and having electrical resistance relative to that of said sensing resistance element such that the change in resistance of said sensing resistance element due to the increase in its temperature as it is heated by said burner decreases the current flow through said control unit precluding energization of said control unit thereby maintaining said switch closed.
- control unit is a warp switch relay unit comprising a resistance heater and a warp strip operatively connected with said switch and said resistance heater of said unit is said operating means connected in parallel with said sensing resistance element.
- a control system as described in claim 1 including a normally open switch connected in series with said normally closed switch, a second control unit which is adapted to be energized to close said normally open switch and wherein said second control unit has operating means connected in series with the parallel circuit formed by the first-named operating means and said sensing resistance element 5.
- said second control unit is a warp switch relay unit comprising a resistance heater and a warp strip operatively connected with said normally opened switch and said resistance heater of said second control unit is said operating means connected in series with said parallel circuit.
- a control system as described in claim 6 which includes an igniter unit connected so as to be energized simultaneously with the energization of the control unit of said normally open switch thereby to render said igniter efiective during the firsttime delay period.
- a control system as described in claim 7 which includes a resistance element in series with said control unit for said normally open switch.
- a gas burner control system energized by electrical energy to control the supply of gas through a gas supply valve to said burner which is adapted to provide a certain minimum heat when operating properly, comprising, in combination, means for forming first and second electrical circuits, both said circuits being connected to receive electrical energy, said first electrical circuit having in series a normally closed switch and a control device operatively connected to said gas supply valve to open said valve when energy is supplied to said device and to close said valve when no energy is supplied to said device, said second circuit having a control operatively connected to said normally closed switch in said first circuit to open said switch when said control is energized above a predetermined energy level and to maintain said switch closed when said control is energized below said predetermined energy level, a resistor having a negative resistance-temperature characteristic such that its resistance decreases when it is heated, said resistor shunting said control in said second circuit thereby to regulate the energy supplied to said control, whereby when said burner is operating properly and is supplying said certain minimum heat said resistor is heated and achieves a low resistance
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Combustion (AREA)
Abstract
An electrical system for igniting gas burners to provide safety features as well as an efficient and dependable means for igniting the gas flame. Gas is ignited by a glow coil and a sensor- or probe-type resistance unit imposes a control function to turn off the gas supply if the burner is not ignited within a predetermined time period. The sensor also closes the gas valve whenever the sensor is no longer heated.
Description
ilnited States Patent [56] References Cited UNITED STATES PATENTS 2.318.195 5/1943 Cate 317/41 X 2.441841 7/1948 Strobel 317/132X 2,549,633 4/1951 Ottmar 431/45 3,017,564 1/1962 Barney 317/41 X 3,282,324 11/1966 Romanelli 431/24 Primary ExaminerFrederick L. Matteson Assistant Examiner-Robert A. Dua Attorney-Curtis, Morris & Safford ABSTRACT: An electrical system for igniting gas burners to provide safety features as well as an efficient and dependable means for igniting the gas flame. Gas is ignited by a glow coil and a sensoror probe-type resistance unit imposes a control function to turn off the gas supply if the burner is not ignited within a predetermined time period. The sensor also closes the gas valve whenever the sensor is no longer heated.
IGNITION SYSTEM This invention relates to gas burner ignition and safety control systems and more in particular to a simplified electrical system for igniting gas burners and for cutting cutting off the gas supply whenever malfunctioning prevents the burner from operating. An object of this invention is to provide improved ignition systems for gas systems. A further object is to provide electrical control systems for gas burners which provide for efficient and dependable ignition and which prevents the objectionable results which occur when the equipment malfunctions. A further object is to provide inexpensive and simple control systems for gas burners and the like. These and other objects will be in part obvious and in part pointed out below.
In the drawing The single FIGURE is a schematic representation of one embodiment of the invention.
A burner 2 is supplied with gas through a valve 4 which is opened by the energization of a solenoid 24 but which closes automatically when the solenoid is deenergized. Electrical power is supplied through a pair of lines 5 and 6 which extend from a control switch represented schematically at 7. The closing of switch 7 supplies electrical power through lines 5 and 6 to an igniter circuit formed by the primary winding of a transformer 8, the secondary winding of which is connected directly to an igniter 10, which is in the form of a resistance heater. Power is also supplied through lines 5 and 6 to a gas supply circuit formed by a normally open switch 20, a normally closed switch 22 and a solenoid 24; and to a control circuit for switches 20 and 22.
The control circuit, formed by resistance units 16 and 18 in parallel and thence in series with resistance units 12 and 14, has a constant voltage impressed across it when switch 7 is closed. Hence, when burner 2 is not ignited, there is a predetermined distribution of that voltage into voltages across unit 12, unit 14 and the parallel circuit of units 16 and 18. However, when burner 2 is ignited and unit 18 is heated so as to have its resistance reduced, the resistance of the parallel circuit of units 16 and 18 is reduced and there is a different distribution of the voltage with a greater voltage across each of units 12 and 14 and a lesser voltage across units 16 and 18. Also, the change in the relative resistances of units 16 and 18 causes unit 18 to shunt a high portion of the total current around unit 16. The characteristics of the circuit are such that when burner 2 is not ignited the voltage across unit 16 and the current flow therethrough will heat strip 17 sufficiently to open switch 22 at the end of the time-delay period of relay unit 15, but when burner 2 is ignited the voltage drop across unit 16 and the current flow therethrough is not sufficient to cause strip 18 to open switch 22.
Consider now that burner 2 is to be ignited, and that switch 7 is moved to its closed position. Relay unit 11 has a 3-second time-delay characteristic so that it closes switch 20 3 seconds after the closing of switch 7. During that 3-second interval or time-delay period, the energization of transformer 8 supplies current to heat igniter 10. The closing of switch 20 then completes a circuit through switch 22 to energize solenoid 24 which opens valve 4 and supplies gas to burner 2. The timedelay period for unit 15 is of the order of 15 seconds so that switch 22 opens only atter unit 16 has been fully energized for 12 seconds after switch 20 has closed. However, during that additional l2-second time-delay while the system is operating normally, burner 2 receives a proper supply of gas and is ignited and it heats sensor unit 18. As explained above, that heating of sensor unit 18 causes an-immediate drop in its resistance with a simultaneous drop in the current flowing through unit 16. As indicated above, that drop in current causes a reduction in the heating of strip 17 of sufficient magnitude to prevent the opening of switch 22. Hence, with the burner operating properly the circuit of solenoid 24 remains energized. I
Consider now that abnormal operating conditions prevent sensor 18 from being heated near the end of the additional time-delay period after switch 20 has been closed. The current flow through unit 16 is still at a high level and warp strip 17 is heated sufficiently to cause it to open switch 22. That breaks the circuit of solenoid 24 so that the solenoid is deenergized and valve 4 closes automatically so as to shut off the supply of gas to burner 2. That circuit condition is maintained as long as power is supplied to lines 5 and 6. That is, unit 16 continues to be energized sufficiently to hold switch 22 open and that prevents the supplying of gas to the burner which in turn prevents sensor 18 from being heated. The unheated sensor in turn causes the current to continue to flow through unit 16. Hence, the system acts as a lockout, thus preventing cycling of the type which occurs with some control systems where the gas is turned on and off without being ignited. Therefore, any malfunctioning which interferes with the operation as explained above prevents the burner from operating until it has received attention. As an example of malfunctioning, if either igniter 10 or unit 18 were to become improperly positioned or defective, the energizing of the control system would result in the opening of switch 22 and valve 4 'would be closed. As another example, the invention contemplates that a pilot flame could be used to ignite the burner, and a defective pilot flame would have the same effect.
The invention contemplates that the operation of the burner can be controlled automatically. With that arrangement, any malfunctioning upon the closing of switch 7 would lock out" the system, and a light or other alarm would be energized to alert the user or other personnel that the system requires attention. In the illustrative embodiment burner 2 is an infrared gas burner in a household appliance, and switch 7 is a standard type of manual switch, but can be a relay switch. It is understood that the illustrative embodiment is adaptable for different environments and the invention contemplates modified constructions and other arrangements within the scope of the claim.
lclaim:
1. in an electrical control system for a burner, the combination of, a sensing resistance element having a negative temperature-resistance characteristic which is positioned to be heated by the burner whereby its electrical resistance is decreased substantially when the burner is operating normally, means constituting a supply of fuel to said burner including a solenoid operated valve means, a normally closed switch connected in series with said solenoid and providing electrical current therethrough to actuate said solenoid thereby to open said valve when said switch is closed, and a control unit operatively associated with said switch to open said switch, after a predetermined time delay period, when said control unit is energized, said control unit including means for operating said switch, said operating means being connected in parallel with said sensing resistance element and having electrical resistance relative to that of said sensing resistance element such that the change in resistance of said sensing resistance element due to the increase in its temperature as it is heated by said burner decreases the current flow through said control unit precluding energization of said control unit thereby maintaining said switch closed.
2. An electrical control system as described in claim 1 wherein said control unit is a warp switch relay unit comprising a resistance heater and a warp strip operatively connected with said switch and said resistance heater of said unit is said operating means connected in parallel with said sensing resistance element. a
3. An electrical control system as described in claim 1 wherein said burner is a gas burner and includes an igniter circuit comprising an igniter element with a transformer having its secondary winding connected thereto.
4. A control system as described in claim 1 including a normally open switch connected in series with said normally closed switch, a second control unit which is adapted to be energized to close said normally open switch and wherein said second control unit has operating means connected in series with the parallel circuit formed by the first-named operating means and said sensing resistance element 5. A control system as described in claim 4 wherein said second control unit is a warp switch relay unit comprising a resistance heater and a warp strip operatively connected with said normally opened switch and said resistance heater of said second control unit is said operating means connected in series with said parallel circuit.
6. A control system as described in claim 4 wherein said switches and their control units have time-delay characteristics whereby said normally open switch is closed a predetermined time after its control unit has been energized and said normally closed switch is not opened for a predetermined time after said normally open switch has been closed.
7. A control system as described in claim 6 which includes an igniter unit connected so as to be energized simultaneously with the energization of the control unit of said normally open switch thereby to render said igniter efiective during the firsttime delay period.
8. A control system as described in claim 7 which includes a resistance element in series with said control unit for said normally open switch. v
9. A gas burner control system energized by electrical energy to control the supply of gas through a gas supply valve to said burner which is adapted to provide a certain minimum heat when operating properly, comprising, in combination, means for forming first and second electrical circuits, both said circuits being connected to receive electrical energy, said first electrical circuit having in series a normally closed switch and a control device operatively connected to said gas supply valve to open said valve when energy is supplied to said device and to close said valve when no energy is supplied to said device, said second circuit having a control operatively connected to said normally closed switch in said first circuit to open said switch when said control is energized above a predetermined energy level and to maintain said switch closed when said control is energized below said predetermined energy level, a resistor having a negative resistance-temperature characteristic such that its resistance decreases when it is heated, said resistor shunting said control in said second circuit thereby to regulate the energy supplied to said control, whereby when said burner is operating properly and is supplying said certain minimum heat said resistor is heated and achieves a low resistance value such that the energy level of said control is below said predetermined energy level and said switch remains closed and when said burner is not operating properly and is not supplying said certain minimum heat to heat said resistor, said resistor achieves a high resistance value such that the energy level of said control is above said predetermined energy level and said switch opens thereby cuttin off the energy su plied to said control device through said irst circuit, thus c osing said gas supply valve to said burner.
Claims (9)
1. In an electrical control system for a burner, the combination of, a sensing resistance element having a negative temperatureresistance characteristic which is positioned to be heated by the burner whereby its electrical resistance is decreased substantially when the burner is operating normally, means constituting a supply of fuel to said burner including a solenoid operated valve means, a normally closed switch connected in series with said solenoid and providing electrical current therethrough to actuate said solenoid thereby to open said valve when said switch is closed, and a control unit operatively associated with said switch to open said switch, after a predetermined time delay period, when said control unit is energized, said control unit including means for operating said switch, said operating means being connected in parallel with said sensing resistance element and having electrical resistance relative to that of said sensing resistance element such that the change in resistance of said sensing resistance element due to the increase in its temperature as it is heated by said burner decreases the current flow through said control unit precluding energization of said control unit thereby maintaining said switch closed.
2. An electrical control system as described in claim 1 wherein said control unit is a warp switch relay unit comprising a resistance heater and a warp strip operatively connected with said switch and said resistance heater of said unit is said operating means connected in parallel with said sensing resistance element.
3. An electrical control system as described in claim 1 wherein said burner is a gas burner and includes an igniter circuit comprising an igniter element with a transformer having its secondary winding connected thereto.
4. A control system as described in claim 1 including a normally open switch connected in series with said normally closed switch, a second control unit which is adapted to be energized to close said normally open switch and wherein said second control unit has operating means connected in series with the parallel circuit formed by the first-named operating means and said sensing resistance element
5. A control system as described in claim 4 wherein said second control unit is a warp switch relay unit comprising a resistance heater and a warp strip operatively connected with said normally opened switch and said resistance heater of said second control unit is said operating means connected in series with said parallel circuit.
6. A control system as described in claim 4 wherein said switches and their control units have time-delay characteristics whereby said normally open switch is closed a predetermined time after its control unit has been energized and said normally closed switch is not opened for a predetermined time after said normally open switch has been closed.
7. A control system as described in claim 6 which includes an igniter unit connected so as to be energized simultaneously with the energization of the control unit of said normally open switch thereby to render said igniter effective during the first-time delay period.
8. A control system as described in claim 7 which includes a resistance element in series with said control unit for said normally open switch.
9. A gas burner control system energized by electrical energy to control the supply of gaS through a gas supply valve to said burner which is adapted to provide a certain minimum heat when operating properly, comprising, in combination, means for forming first and second electrical circuits, both said circuits being connected to receive electrical energy, said first electrical circuit having in series a normally closed switch and a control device operatively connected to said gas supply valve to open said valve when energy is supplied to said device and to close said valve when no energy is supplied to said device, said second circuit having a control operatively connected to said normally closed switch in said first circuit to open said switch when said control is energized above a predetermined energy level and to maintain said switch closed when said control is energized below said predetermined energy level, a resistor having a negative resistance-temperature characteristic such that its resistance decreases when it is heated, said resistor shunting said control in said second circuit thereby to regulate the energy supplied to said control, whereby when said burner is operating properly and is supplying said certain minimum heat said resistor is heated and achieves a low resistance value such that the energy level of said control is below said predetermined energy level and said switch remains closed and when said burner is not operating properly and is not supplying said certain minimum heat to heat said resistor, said resistor achieves a high resistance value such that the energy level of said control is above said predetermined energy level and said switch opens thereby cutting off the energy supplied to said control device through said first circuit, thus closing said gas supply valve to said burner.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US81359369A | 1969-04-04 | 1969-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3589847A true US3589847A (en) | 1971-06-29 |
Family
ID=25212850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US813593A Expired - Lifetime US3589847A (en) | 1969-04-04 | 1969-04-04 | Ignition system |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3589847A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5791890A (en) * | 1995-08-18 | 1998-08-11 | General Electric Company | Gas oven control with proof of ignition |
| US6030205A (en) * | 1995-08-18 | 2000-02-29 | General Electric Company | Gas oven control |
| US6776608B2 (en) * | 1999-03-19 | 2004-08-17 | Worgas Bruciatori S.R.L. | Method and means for a security control of burners |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2318195A (en) * | 1939-11-01 | 1943-05-04 | Fulton Sylphon Co | Ignition system |
| US2445841A (en) * | 1943-08-16 | 1948-07-27 | Robertshaw Fulton Controls Co | Safety control for fuel burners |
| US2549633A (en) * | 1945-12-22 | 1951-04-17 | Metals & Controls Corp | Gas burner ignition and safety control system |
| US3017564A (en) * | 1954-08-12 | 1962-01-16 | Barney Walter | Protective circuit |
| US3282324A (en) * | 1965-10-11 | 1966-11-01 | Ram Domestic Products Company | Automatic fuel ignition and heat detection system |
-
1969
- 1969-04-04 US US813593A patent/US3589847A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2318195A (en) * | 1939-11-01 | 1943-05-04 | Fulton Sylphon Co | Ignition system |
| US2445841A (en) * | 1943-08-16 | 1948-07-27 | Robertshaw Fulton Controls Co | Safety control for fuel burners |
| US2549633A (en) * | 1945-12-22 | 1951-04-17 | Metals & Controls Corp | Gas burner ignition and safety control system |
| US3017564A (en) * | 1954-08-12 | 1962-01-16 | Barney Walter | Protective circuit |
| US3282324A (en) * | 1965-10-11 | 1966-11-01 | Ram Domestic Products Company | Automatic fuel ignition and heat detection system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5791890A (en) * | 1995-08-18 | 1998-08-11 | General Electric Company | Gas oven control with proof of ignition |
| US6030205A (en) * | 1995-08-18 | 2000-02-29 | General Electric Company | Gas oven control |
| US6776608B2 (en) * | 1999-03-19 | 2004-08-17 | Worgas Bruciatori S.R.L. | Method and means for a security control of burners |
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