GB2138659A - Glass Ceramic Hob including Temperature Sensor - Google Patents
Glass Ceramic Hob including Temperature Sensor Download PDFInfo
- Publication number
- GB2138659A GB2138659A GB08325660A GB8325660A GB2138659A GB 2138659 A GB2138659 A GB 2138659A GB 08325660 A GB08325660 A GB 08325660A GB 8325660 A GB8325660 A GB 8325660A GB 2138659 A GB2138659 A GB 2138659A
- Authority
- GB
- United Kingdom
- Prior art keywords
- glass ceramic
- hob
- temperature
- detector
- hob according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0258—For cooking
- H05B1/0261—For cooking of food
- H05B1/0266—Cooktops
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/10—Tops, e.g. hot plates; Rings
- F24C15/102—Tops, e.g. hot plates; Rings electrically heated
- F24C15/105—Constructive details concerning the regulation of the temperature
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
- H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
- H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/04—Heating plates with overheat protection means
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/07—Heating plates with temperature control means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Control Of Resistance Heating (AREA)
- Resistance Heating (AREA)
Abstract
A glass ceramic cooker hob includes, as a temperature sensing device, an electrical resistance temperature detector which is in contact with the glass ceramic. A signal from the detector is used to control the energy supplied to a hob-heater element. A further signal is generated when the temperature of the hob exceeds a predetermined value.
Description
SPECIFICATION
Temperature Control
This invention relates to means for controlling the temperature of a surface, particularly the temperature of a glass ceramic top heater/hob of a cooking appliance.
Glass ceramic hobs are becoming increasingly popular in place of hobs incorporating the more traditional metallic hot plate or "radiant ring" type of elements in electrically powered cooking/ heating applicances. Glass ceramic hobs generally comprise a sheet of glass ceramic mounted substantially horizontally and constituting the upper surface (i.e. the working surface) of the appliance and concealing one or more heater elements mounted under and spaced apart from the glass ceramic. Each element heats by radiation a region of the underside of the glass ceramic and thence any utensil placed above and in contact with the upper surface of glass ceramic.
The glass ceramic is designed to have a high heat conductivity through it in a direction substantially normal to its surface but a low heat conductivity in other directions and especially in directions parallel to or having a substantial component parallel to its surface, so that a localised area of the upper surface of the glass ceramic and thence any utensil placed immediately above it quickly becomes hot through a combination of direct radiation through the glass ceramic and heat conduction from the glass ceramic. This area will for convenience be referred to throughout the remainder of this specification as the "hot plate area".
Each heater element generally consists of a length of relatively thin resistance wire which is wound in the form of a helix and partially embedded in a suitable insulating material, contained in a flanged plate, sometimes known in the art as a "flan-pan". Typically, the helix is arranged in the insulating material in a pattern, for example a tortile pattern, suitable for permitting a high concentration of heat to be radiated on to the underside of that region of the ceramic glass constituting the hot plate area. In order to retain the essential characteristics of the glass ceramic, it is necessary to limit maximum temperature or the time spent at temperatures in excess of a temperature specified by the glass ceramic manufacturer. It is also necessary to provide for thermostatic control at lower temperatures.In order to limit the maximum safe temperature of the hot plate area and to provide thermostatic control, it is the usual practice to provide a tube made from a refractory material having a relatively low coefficient of thermal expansion, such as Quartz or fused silica, mounted diagonally through holes formed in the flange of the flanged plate in such a position that the tube is located between the element and the underside of the glass ceramic, but in contact with neither, in one end of the tube being secured a rod or strip made from a material having a relatively high coefficient of thermal expansion such that the differential thermal expansion between tube and rod or strip at the other end of the tube is arranged to make or break an electrical circuit, that is, directly or indirectly, the power supply to the element, in response to variations in the amount of heat radiated by the element and hence in the temperature of the hot plate area. This is rather a crude and inefficient means of control however, since there is inherently, from device to device, a spread of temperatures, sometimes as wide as 700C or more for any given thermostat setting, over which the electrical circuit is switched, and also such electro mechanical thermostats exhibit hysterisis between switching on and switching off in the order of 4000. For the sake of safety, it is therefore necessary to calibrate each device to break circuit at a lower rather than a higher temperature.This means in practice that some hot plate areas will not be capable of attaining a temperature approaching the theoretical maximum safe operating temperature, which theoretical temperature is dependent on the maximum operating temperature of the glass ceramic.
Furthermore, such devices are vulnerable to vibration and the calibration is subject to drift with ageing.
It is therefore one object of the present invention to provide a more sensitive and a more reproducible means of controlling hot plate temperature, thus allowing the maximum temperature to be set closer to the maximum safe operating temperature of the glass ceramic.
One of the main advantages of glass ceramic hobs is the smooth and uninterrupted surface when integrated with modern kitchen furnishings and hence their ease of cleaning. This attractive feature would be marred if a warning were not provided to alert the user that the hot plate region is still hot after switch off, even when decorative patterns are employed to indicate the individual heating zones. The high temperature is not evident after the elements are switched off and hence the glass ceramic remains potentially dangerous for some considerable time afterwards.
This problem has hitherto been overcome by providing in a convenient location a bulb, neon or a light emitting diode which is electrically connected to glow when a hot plate area is being heated or maintained at a thermostatically controlled temperature and which is further connected to a time delay circuit so that it continues to glow for a time sufficient to allow the hot plate area to cool to a safe temperature after the power supply to the element has been disconnected. Clearly, however, such an arrangement also is rather crude and consequently it is a further object of the invention to provide means for indicating precisely whether or not a hot plate is hotter than a pre-determined temperature.
According to the present inventi6n,- a glass ceramic hob includes, as the temperature sensing device, an electrical resistance temperature detector disposed in contact with the underside of the glass ceramic, wherein the resistance value of the temperature detector varies with temperature, means for converting the resistance value into a signal for controlling the energy supplied to a hob-heater element independence of the said signal, and wherein the control means produces a secondary output when the temperature of the hob exceeds a predetermined value.
The RTD preferably comprises an electrically conducting path comprising metal particles printed or otherwise applied to the surface of an electrically non-conducting substrate. In the present invention, the RTD or a plurality of RTDs may be in contact with the glass ceramic, in which case the temperature of the glass ceramic is monitored and controlled directly. Where the
RTD is beneath and spaced apart from the glass ceramic the heat incident upon it comprises essentially radiant heat from the lower surface of the glass ceramic. Where the RTD is in contact with the glass ceramic, it may be attached to or incorporated in the glass ceramic, or the nonconducting substrate may be part of the glass ceramic.Where a plurality (say, for example, ten or twenty) of RTDs are utilised in contact with the glass ceramic, their individual outputs are averaged to provide a signal indicative of the average temperature of the hot plate area with electrical power cut-out means, should one or more individual RTDs indicate an abnormally high glass ceramic temperature, being optionally included as a precaution against local overheating and consequent degradation. We prefer, however, to locate the RTD beneath and spaced apart, for example by about 2.5 cms, from the glass ceramic where it can be made to given an-output signal fairly indicative of the average hotplate area temperature.
In this latter embodiment, we have found that the location of the resistance temperature detector or RTD is critical in enabling the temperature of the hot plate area to be closely controlled. We prefer to locate the RTD in a depression in the insulating material such that the main source of heat energy incident upon the RTD is radiation from the underside of the glass ceramic sheet and direct'radiation from the heater elements to the RTD can be substantially avoided.
Conversely, for some applications it is desirable to allow more or less of the direct radiation from the heating element to influence the temperature control via RTD, in which case the RTD may be mounted above the surface of the insulating compound, or indeed partially submerged in the insulation. Alternatively, the heater element may be located in a depression in the insulating material and the RTD may be on or substantially on the surface of the insulating material or the heater element and the RTD may each be partially embedded in the insulating material.
According to a preferred embodiment of the invention, a glass ceramic hob comprises a flanged plate containing a refractory insulating
material in which is partially embedded a heater element, the whole being covered with a sheet of glass ceramic spaced apart from the element, an
RTD being located in relation to the insulating material in such a manner that at least part of the resistive path of the RTD can receive radiation directly from the underside of the glass and at least a proportion of the resistive path in the RTD is screened from receiving radiation directly from the heater element, suitable electrical connections being provided through the flanged plate to supply electrical current to the heater element and to the RTD.The variation in resistance of the RTD is converted via a bridge circuit and amplifier into a signal used to control the energy supplied to the heater element.
Suitable resistance temperature detectors (RTDs) are described in our British Patent No.
141 5644 and U.S. Patent No. 4222025 and comprise a substrate made from an electrically non-conducting material and carrying an electrically conducting tortile path consisting essentially of fused vitreous material loaded withelectrically conducting particles made from one or more metals selected from the group consisting of gold, silver, platinum, rhodium, ruthenium, iridium, palladium, iron, nickel, cobalt, and copper.
As an alternative, the electrically conducting path may be essentially free of vitreous material and may comprise electrically conducting particles fused together by heating to a temperature less than their melting temperature (see for example our British Patent Application No. 20021 75A).
RTDs such as described above may be provided with a protective outer coating made from a glaze, and may comprise either a flat or a cylindrical substrate.
The heater element preferably comprises a length of relatively thin resistance wire wound in the form of a helix and arranged on or at least partially within the insulating material in a tortile pattern, for example a spiral or a re-entrant spiral.
A further embodiment may comprise a heating system based upon a so-called gas "surface" burner. The RTD is preferably located, suitably screened, in the central region of the pattern described by the heater element.
We have found that a cylindrical RTD rated at 200 ohms (nominal resistance at OOC) and having a length of 29 mm and a diameter of 3 mm is satisfactory for the present invention. Such detectors have a high and reproducible temperature coefficient of resistance and can therefore be used to control glass ceramic hobs accurately to temperatures close to the maximum safe operating temperature of the glass ceramic.
Furthermore, a secondary output from the bridge circuit may be used to operate a warning light or other device, e.g. such that the warning light glows all the time the temperature of the hob exceeds a pre-determined safe value:
We have found that locating the RTD in the
indicated manner where it receives heat
substantially from the under surface of the glass
ceramic gives an excellent means of controlling
the temperature of the upper surface of the glass,
and that, whereas previous methods of controlling
the heating process in such applications have
relied upon the principle of energy regulation of
the heater element, the use of RTDs allows, by
incorporation into the control circuit, the use of
temperature control, which brings with it closer
control of the temperature of the glass ceramic, and-also the means to heat the glass ceramic to
temperatures below maximum setting, in a
shorter time than is normally possible with
existing energy regulation based upon electro
mechanical systems.
Accordingly the invention also includes a method for controlling the temperature of a glass
ceramic hob comprises locating in confronting
relationship with the glass ceramic an electrical
resistance temperature detector comprising metal
particles printed or otherwise applied to the
surface of an electrically non-conducting
substrate, supplying electrical current to the
detector, and converting the perceived resistance
of the detector into a signal to control the energy
supplied to the hob heating means.
By "confronting relationship" we mean to
include the detector being in contact with the
glass ceramic and also spaced from the glass
ceramic, both as hereinbefore defined.
Claims (9)
1. A glass ceramic hob including an electrical
resistance temperature detector disposed in
contact with the underside of the glass ceramic,
whereinthe resistance value of the temperature
detector varies with temperature, means for
converting the resistance value into a signal for
controlling the energy supplied to a hob-heater
element independence of the said signal, and wherein the control means produces a secondary
output when the temperature of the hob exceeds
a pre-determined value.
2. A hob according to claim 1 including power
cut-out means associated with individual
detectors.
3. A hob according to claim 2 in which the
detector is located in a depression in insulating
material on or at least partially within which is
located the heater element.
4. A hob according to any preceding claim
wherein the detector comprises an electrically
conducting path comprising metal particles
applied to the surface of an electrically non
conducting substrate.
5. A hob according to any preceding claim in
which one or more detectors are in contact with
the glass ceramic.
6. A hob according to claim 5 in which the
non-conducting substrate is part of the glass
ceramic.
7. A hob according to claim 5 in which a
plurality of detectors are utilised, their individual
outputs being averaged to provide a signal
indicative of the average temperature of the hot
plate area (as hereinbefore defined).
8. A hob according to any preceding' claim in
which the heater element comprises a length of
resistance wire in the form of a helix and arranged on or at least partially within insulating material in
a tortile pattern.
9. A method for controlling the temperature of a glass ceramic hob comprising locating one or more electrical resistance temperature detectors comprising an electrically conducting path comprising metal particles applied to the surface of an electrically non-conducting substrate and disposed in contact with the glass ceramic, supplying electrical current to the or each detector, and converting the perceived resistance of the or each detector into a signal to control the energy supplied to the hob heating means.
1 0. A method for controlling the temperature of a glass ceramic hob substantially as herein described.
9. A hob according to any preceding claim
which is heated by a burner fuelled by gas.
10. A hob according to claim 1 comprising a
flanged plate containing a refractory insulating
material in which is partially embedded a heater
element, the whole being covered with a sheet of
glass ceramic spaced apart from the element, an
electrical resistance temperature detector being
located in relation to the insulating material in
such manner that at least part of the resistive
path of the detector can receive radiation directly
from the underside of the glass and at least a
proportion of the resistive path of the detector is
screened from receiving radiation directly from
the heater element.
11. A hob according to any preceding claim
further including a warning device activated by
the output from the detector to indicate when the
temperature of the glass ceramic is in excess of a
pre-determined value.
12. A glass ceramic hob constructed and
arranged substantially as hereinbefore described.
Amendments to the Claims have been Filed, and
have the Following Effect: *(a) Claims 1-12 Above have been Deleted or
Textually Amended.
*(b) New or Textually Amended Claims have been
Filed as Follows: 1-10
1. A glass ceramic hob including one or more
electrical resistance temperature detectors each
comprising an electrically conducting path
comprising metal particles applied to thesurface of an electrically non-conducting substrate and
disposed in contact with the underside of the
glass ceramic, wherein the resistance value of the
or each temperature detector varies with
temperature, means for converting the resistance
value into a signal for controlling the energy
supplied to a hob-heater element in dependence
on the said signal, and wherein the control means
produces a secondary output when the
temperature. of the hob exceeds a pre-determined
value.
2. A hob according to claim 1, including power
cut-out means associated with the or each
individual detector.
3. A hob according to claim 1 or 2, in which the
non-conducting substrate is part of the glass
ceramic.
4. A hob according to claim 1, in which a
plurality of detectors is utilised, their individual
outputs being averaged to provide a signal
indicative of the average temperature of the hot
plate area (as hereinbefore defined).
5. A hob according to any preceding claim in
which the heater element comprises a length of
resistance wire in the form of a helix and arranged
on or at least partially within insulating material in
a tortile pattern.
6. A hob according to any one of claims 1 to 4,
which is heated by a burner fuelied by gas.
7. A hob according to any preceding claim further including a warning device activatable by the output from the or each detector to indicate when the temperature of the glass ceramic is in excess of a pre-determined value.
8. A glass ceramic hob including one or more electrical resistance temperature detectors disposed in contact with the underside of the glass ceramic, constructed and arranged substantially as hereinbefore described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08325660A GB2138659B (en) | 1980-01-14 | 1983-09-26 | Glass ceramic hob including temperature sensor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8001205 | 1980-01-14 | ||
| GB08325660A GB2138659B (en) | 1980-01-14 | 1983-09-26 | Glass ceramic hob including temperature sensor |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8325660D0 GB8325660D0 (en) | 1983-10-26 |
| GB2138659A true GB2138659A (en) | 1984-10-24 |
| GB2138659B GB2138659B (en) | 1985-05-15 |
Family
ID=26274135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08325660A Expired GB2138659B (en) | 1980-01-14 | 1983-09-26 | Glass ceramic hob including temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2138659B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2170002A (en) * | 1985-01-17 | 1986-07-23 | Licentia Gmbh | Ceramic hob |
| DE3703768A1 (en) * | 1987-02-07 | 1988-08-18 | Fissler Gmbh | DEVICE FOR DETECTING THE TEMPERATURE OF A GLASS CERAMIC PLATE HEATED BY HEATING WINDINGS OR HALOGEN LAMPS |
| EP0467133A2 (en) * | 1990-07-18 | 1992-01-22 | Schott Glaswerke | Temperature sensor or sensing devices made of glass-ceramics with contacting film-resistances |
| EP0471171A2 (en) * | 1990-07-18 | 1992-02-19 | Schott Glaswerke | Device for regulating and limiting the power of a heating plate of ceramic or similar material |
| DE4039664A1 (en) * | 1990-12-12 | 1992-06-17 | Ego Elektro Blanc & Fischer | Heating condition indicator for electrical cooking plate - indicates heating condition also with switched off cooking plate using temp. switch with is sensing element partly extending in blind bore of plate body |
| EP0607745A1 (en) * | 1993-01-22 | 1994-07-27 | Emerson Electric Co. | Control for glass cooktops |
| EP0652688A1 (en) * | 1993-10-28 | 1995-05-10 | Daimler-Benz Aktiengesellschaft | Method of controlling the heating power of a vitroceramic hob according to required cooking conditions |
| EP0786923A2 (en) * | 1996-01-26 | 1997-07-30 | AEG Hausgeräte GmbH | Switching system for the overtemperature protection of a glass ceramic plate of a cooktop |
| EP0789503A3 (en) * | 1996-02-07 | 1998-01-07 | AKO-Werke GmbH & Co. KG | Radiant heater |
| GB2391725A (en) * | 2002-04-17 | 2004-02-11 | Diamond H Controls Ltd | Control device with thermal sensor |
| US6995344B2 (en) | 2001-06-28 | 2006-02-07 | Ceramaspeed Limited | Cooking appliance |
| DE19646826C5 (en) * | 1996-02-22 | 2008-10-16 | AEG Hausgeräte GmbH | Device for measuring the temperature of hotplates |
| ES2325108A1 (en) * | 2006-09-13 | 2009-08-25 | Bsh Electrodomesticos España, S.A. | Cooking device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1478583A (en) * | 1974-01-23 | 1977-07-06 | Scholtes E Ets | Household cooking apparatus |
| GB1574167A (en) * | 1976-12-30 | 1980-09-03 | Bosch Siemens Hausgeraete | Cooking apparatus |
| GB2060329A (en) * | 1979-10-11 | 1981-04-29 | Thorn Domestic Appliances Ltd | Cooking hobs |
-
1983
- 1983-09-26 GB GB08325660A patent/GB2138659B/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1478583A (en) * | 1974-01-23 | 1977-07-06 | Scholtes E Ets | Household cooking apparatus |
| GB1574167A (en) * | 1976-12-30 | 1980-09-03 | Bosch Siemens Hausgeraete | Cooking apparatus |
| GB2060329A (en) * | 1979-10-11 | 1981-04-29 | Thorn Domestic Appliances Ltd | Cooking hobs |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2170002A (en) * | 1985-01-17 | 1986-07-23 | Licentia Gmbh | Ceramic hob |
| DE3703768A1 (en) * | 1987-02-07 | 1988-08-18 | Fissler Gmbh | DEVICE FOR DETECTING THE TEMPERATURE OF A GLASS CERAMIC PLATE HEATED BY HEATING WINDINGS OR HALOGEN LAMPS |
| US5352864A (en) * | 1990-07-18 | 1994-10-04 | Schott Glaswerke | Process and device for output control and limitation in a heating surface made from glass ceramic or a comparable material |
| EP0467133A2 (en) * | 1990-07-18 | 1992-01-22 | Schott Glaswerke | Temperature sensor or sensing devices made of glass-ceramics with contacting film-resistances |
| EP0471171A2 (en) * | 1990-07-18 | 1992-02-19 | Schott Glaswerke | Device for regulating and limiting the power of a heating plate of ceramic or similar material |
| EP0471171A3 (en) * | 1990-07-18 | 1992-08-05 | Schott Glaswerke | Method and device for regulating and limiting the power of a heating plate made of ceramic or similar material |
| EP0467133A3 (en) * | 1990-07-18 | 1992-09-02 | Schott Glaswerke | Temperature sensor or sensing devices made of glass-ceramics with contacting film-resistances |
| US5258736A (en) * | 1990-07-18 | 1993-11-02 | Schott Glaswerke | Temperature sensor or temperature sensor arrangement made from glass ceramic and bonding film resistors |
| DE4039664A1 (en) * | 1990-12-12 | 1992-06-17 | Ego Elektro Blanc & Fischer | Heating condition indicator for electrical cooking plate - indicates heating condition also with switched off cooking plate using temp. switch with is sensing element partly extending in blind bore of plate body |
| EP0607745A1 (en) * | 1993-01-22 | 1994-07-27 | Emerson Electric Co. | Control for glass cooktops |
| EP0652688A1 (en) * | 1993-10-28 | 1995-05-10 | Daimler-Benz Aktiengesellschaft | Method of controlling the heating power of a vitroceramic hob according to required cooking conditions |
| EP0786923A2 (en) * | 1996-01-26 | 1997-07-30 | AEG Hausgeräte GmbH | Switching system for the overtemperature protection of a glass ceramic plate of a cooktop |
| EP0786923A3 (en) * | 1996-01-26 | 1998-01-07 | AEG Hausgeräte GmbH | Switching system for the overtemperature protection of a glass ceramic plate of a cooktop |
| EP0789503A3 (en) * | 1996-02-07 | 1998-01-07 | AKO-Werke GmbH & Co. KG | Radiant heater |
| DE19646826C5 (en) * | 1996-02-22 | 2008-10-16 | AEG Hausgeräte GmbH | Device for measuring the temperature of hotplates |
| US6995344B2 (en) | 2001-06-28 | 2006-02-07 | Ceramaspeed Limited | Cooking appliance |
| GB2391725A (en) * | 2002-04-17 | 2004-02-11 | Diamond H Controls Ltd | Control device with thermal sensor |
| ES2325108A1 (en) * | 2006-09-13 | 2009-08-25 | Bsh Electrodomesticos España, S.A. | Cooking device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2138659B (en) | 1985-05-15 |
| GB8325660D0 (en) | 1983-10-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |