EP0041203B1 - Dispositif pour loger de façon thermiquement isolée une hélice chauffante électrique, en particulier pour une plaque de cuisson chauffée par rayonnement et procédé pour sa fabrication - Google Patents
Dispositif pour loger de façon thermiquement isolée une hélice chauffante électrique, en particulier pour une plaque de cuisson chauffée par rayonnement et procédé pour sa fabrication Download PDFInfo
- Publication number
- EP0041203B1 EP0041203B1 EP81103958A EP81103958A EP0041203B1 EP 0041203 B1 EP0041203 B1 EP 0041203B1 EP 81103958 A EP81103958 A EP 81103958A EP 81103958 A EP81103958 A EP 81103958A EP 0041203 B1 EP0041203 B1 EP 0041203B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- insulating
- bedding
- heat
- heating spiral
- 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.)
- Expired
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 45
- 238000010411 cooking Methods 0.000 title claims abstract 6
- 238000000034 method Methods 0.000 title claims description 8
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 230000005855 radiation Effects 0.000 title description 2
- 230000004308 accommodation Effects 0.000 title 1
- 239000000463 material Substances 0.000 claims abstract description 42
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000011810 insulating material Substances 0.000 claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 7
- 239000003605 opacifier Substances 0.000 claims abstract description 7
- 230000002787 reinforcement Effects 0.000 claims abstract description 7
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 238000000197 pyrolysis Methods 0.000 claims abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract 6
- 239000011707 mineral Substances 0.000 claims abstract 6
- 239000004965 Silica aerogel Substances 0.000 claims abstract 3
- 230000002093 peripheral effect Effects 0.000 claims description 19
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 5
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 4
- 230000001698 pyrogenic effect Effects 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 6
- 239000000919 ceramic Substances 0.000 claims 2
- 239000003779 heat-resistant material Substances 0.000 claims 2
- 229910021485 fumed silica Inorganic materials 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 description 44
- 239000012774 insulation material Substances 0.000 description 10
- 239000000377 silicon dioxide Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 6
- 239000002241 glass-ceramic Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000007496 glass forming Methods 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 239000002557 mineral fiber Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical group [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical group [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000004964 aerogel Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
- 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
- H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
-
- 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
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/017—Manufacturing methods or apparatus for heaters
Definitions
- the invention relates to a device for the heat-insulating mounting of an electric heating coil, in particular for a radiation-heated hotplate, according to the preamble of claim 1, and to a heat-insulating plate which is particularly suitable for use with the device and a method which is particularly suitable for its production.
- a device of this type is known for example from DE-A-28 06 367.
- the insulation layer on the basis of Keiselklareaerogel is introduced in this known device as the only heat insulation layer between the heating coil and the bottom of the receptacle made of sheet metal, so that the excellent thermal insulation properties of this special thermal insulation material are optimally used.
- Adequate temperature resistance in the immediate vicinity of the heating coil, which lies directly on the insulation layer, is sought by adding aluminum oxide, which counteracts sintering of the silica airgel at temperatures above about 700 ° C .; aluminum oxide in the form of reinforcing fibers or as an additional admixture can be present in an amount of up to 12% in the insulating material based on silicic acid airgel.
- Materials for opacifiers are manganese dioxide, titanium dioxide and zirconium oxide.
- Insulation material of this type has an extremely high thermal resistance, but is not mechanically stable, since it tends to crumble or crumble in the area of already low voltage peaks.
- the shaped body for storing the heating coil can be produced as an inexpensive pressed part which only has to be inserted into the receiving shell, which already contains material of the thermal barrier layer pressed directly against the bottom of the receiving shell.
- a radiation-heated hotplate is known, the electric heating coil of which is mounted on an insulating support in the form of a disk made of a cardboard-like material, a mechanically perfect and vibration-proof mounting of the electrical heating resistors being ensured on the cardboard-like material.
- the insulating support formed in this way is in turn supported on insulating layers or disks, the lower insulating layer in particular being able to have low mechanical strength, for example consisting of a bulk material which is not or only slightly compressed, for example finely divided silica.
- this known device results in the construction with a bottom-side, mechanically less solid, but good thermal insulation layer, for example based on silica airgel, and above that a special mechanically stronger bearing layer for supporting the heating coil.
- the material of the solid bearing layer makes only a minor contribution to thermal insulation and thus increases the overall height of the bearing device above the effective thermal barrier layer.
- the invention has for its object to provide a device of the type specified in the preamble of claim 1 and a thermal insulation panel for forming the thermal insulation material for this purpose, which has both excellent thermal insulation properties with a low overall height, as well as a structurally simple and reliable position securing of the heating coil .
- the insulation layer can of course also be hardened accordingly, since this increases its mechanical resistance, for example for effective edge protection, albeit at the cost of a slight decrease in thermal insulation capacity; however, since the insulation layer does not need to have the mechanical resistance of the bearing layer, the insulation layer is often not hardened.
- a base material based on pyrogenic aluminum oxide should be preferred instead of pyrogenic silica, since although pyrogenic silica still gives slightly better thermal insulation properties, material based on aluminum oxide airgel is considerably more temperature-resistant without additional measures.
- high-temperature resistant materials such as manganese oxide, titanium oxide or zirconium oxide can be introduced into the insulating material of the bearing layer in order to further increase the temperature resistance if necessary.
- the device according to the invention thus consists of the receptacle, for example in the form of a sheet metal bowl, the thermal insulation panel to form the thermal insulation material consisting of the insulating layer and the bearing layer, and the heating coil, which is mounted directly on the bearing layer of the thermal insulation panel.
- the thermal insulation board can be prefabricated in a cost-effective manner, for which purpose, according to claim 13, one of the layers - the insulating layer or the bearing layer - is pressed from amorphous powder of the desired consistency in order to achieve pressure fixation, then the material of the other layer is applied and with the pre-pressed layer under higher pressure is finished pressed, whereupon the curing can take place under suitable heat.
- thermal insulation board as a molded part also enables the application of helical grooves to the top of the bearing layer, into which the heating coil can be glued with a high-temperature-resistant inorganic adhesive, as well as a trough-shaped design of this area of the bearing layer with circumferential peripheral edge, without any additional effort. which, due to the mechanical strength of the material of the bearing layer, can directly form the contact surface for the glass ceramic cover of the hotplate, so that a separate spacer ring can be dispensed with in a cost-effective manner.
- the illustrated device consists essentially of a receptacle 1 made of metal, in particular aluminum sheet, and thermal insulation material in the form of a thermal insulation panel 2, which is arranged on the inside of a peripheral wall 3 of the receptacle 1 between the bottom 4 and a heating coil 5.
- the electrically operated heating coil 5 has electrical connections, not shown, which are led out of the area of the receiving shell 1 in a suitable manner.
- the device shown is used for radiant heating of a glass-ceramic cover of a hotplate, the glass-ceramic plate (not shown in detail) resting on a support surface 22 and thus receiving a distance from the upper edge of the peripheral wall 3 of the receiving shell 1 and from the heating coil 5.
- the peripheral wall 3 of the receiving shell 1 and thus the entire device has an essentially circular shape in plan view and is concentric with a central axis 14.
- the thermal insulation panel 2 consists of an upper bearing layer 7, which receives the heating coil 5 in helical grooves 8.
- an insulating layer 9 is provided, which abuts the bottom 4 of the receiving shell 1 and consists of fine-pored silica airgel.
- This material is known per se and, in addition to the silica airgel, generally has a mineral fiber reinforcement and / or an opacifying agent;
- Such highly effective thermal insulation materials are sold by the applicant under the name MINILEIT (registered trademark), reference being made to the relevant DE-Osen 27 47 663, 27 48 307 and 27 54 956 for details of the material, to which reference is expressly made is taken.
- a material is preferably used for the insulation layer 9, which consists of 30 to 50% fumed silica, 20 to 50% opacifying agent and 5 to 15% aluminum fibers, as well as in one There is a density of 200 to 400 kg / m 3 , but need not be organically or inorganically hardened.
- Such a special thermal insulation material has a thermal conductivity that is lower than still air and is also only slightly temperature-dependent.
- the plates pressed from powdery raw materials made of such a material are not mechanically resistant and difficult to manufacture. For this reason, panels made of this material are usually surrounded by a solid glass fabric during production and subsequently cut to the desired shape.
- the upper bearing layer 7 consists of an aluminum oxide airgel instead of the silica " airgel of the insulation layer 9, or a suitable mixture of both aerogels.
- Such insulating material based on aluminum oxide airgel is more resistant to higher temperatures than on the basis of silica airgel.
- the bearing layer 7 may contain additions of high-temperature resistant substances such as manganese oxide, zirconium oxide or titanium oxide to further increase the temperature resistance, but above all the material of the bearing layer 7 is hardened with an inorganic binder, for example with suitable glass-forming substances is known from the earlier patent application EP-A-0 027 264 (prior art according to Art.
- the bearing surfaces 22 can be formed directly on the upper side of a peripheral edge 10 which, in the illustrated manner, surrounds a trough in the bearing layer 7 for receiving the heating coil 5 on the circumference and thus radiates heat to the peripheral wall 3 of the receiving shell 1 safely avoids.
- the material in the upper end area 11 of the peripheral edge 10 can be additionally compressed.
- the thermal insulation board 2 from the lower insulation layer 9 and the upper bearing layer 7 together with grooves 8 and peripheral edge 10 with a bearing surface 22 can be produced as a one-piece pressed part.
- the powdery material of one of the layers 7 or 9 is first introduced into a press mold and pre-pressed for fixing the pressure, the pressure should be below 25 bar and a pressure of 15 to 20 bar being preferred; good results were obtained at a pressure of 18 bar.
- the material of the other layer 9 or 7 is added and the blank for the entire thermal insulation board 2 is pressed in one go under a higher pressure of more than 25 bar, in particular at a pressure between 25 and 40 bar; good results were achieved with a pressure of 30 bar.
- the bearing layer 7 is first pressed in the reverse position and remains in this position for the final pressing.
- the blank for the thermal insulation board 2 is expediently pressed in the position turned over relative to the operating position, since then an easier filling of the relief-like bottom of the press chamber is possible, which corresponds to the negative of the bearing trough of the bearing layer 7 for the heating winding 5.
- the finished thermal insulation panel 2 can be removed.
- the adhesive 6 needs to be introduced into the grooves 8 and the heating coil 5 inserted, after which the thermal insulation panel 2 with the heating coil can be inserted into the receiving shell.
- the molded body forming the thermal insulation board 2 has sufficient stability due to the hardening of the bearing layer 7, the more susceptible free edge of the insulating layer 9 being protected against breakage by the rounding corresponding to the rounding between the peripheral wall 2 and the bottom 4 of the receiving shell 1. Therefore, the thermal insulation board 2 can be shipped and assembled without great risk of damage, and is of course tradable independently.
- the percentages relate to percentages by weight in the raw material mixture.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Thermal Insulation (AREA)
- Resistance Heating (AREA)
Claims (18)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81103958T ATE9255T1 (de) | 1980-05-29 | 1981-05-22 | Vorrichtung zur waermedaemmenden lagerung einer elektrischen heizwendel, insbesondere fuer eine strahlungsbeheizte kochplatte, sowie waermedaemmplatte hierzu und verfahren zu ihrer herstellung. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3020326 | 1980-05-29 | ||
DE3020326A DE3020326C2 (de) | 1980-05-29 | 1980-05-29 | Strahlungsheizkörper mit einer elektrischen Heizwendel, insbesondere für eine Glaskeramik-Kochplatte |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0041203A1 EP0041203A1 (fr) | 1981-12-09 |
EP0041203B1 true EP0041203B1 (fr) | 1984-09-05 |
EP0041203B2 EP0041203B2 (fr) | 1988-06-08 |
Family
ID=6103462
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81103958A Expired EP0041203B2 (fr) | 1980-05-29 | 1981-05-22 | Dispositif pour loger de façon thermiquement isolée une hélice chauffante électrique, en particulier pour une plaque de cuisson chauffée par rayonnement et procédé pour sa fabrication |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0041203B2 (fr) |
AT (1) | ATE9255T1 (fr) |
DE (1) | DE3020326C2 (fr) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3102935A1 (de) * | 1981-01-29 | 1982-09-02 | Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen | Vorrichtung zur waermedaemmenden lagerung einer elektrischen heizwendel, insbesondere fuer eine strahlungsbeheizte kochplatte, sowie waermedaemmplatte hierzu und verfahren zu ihrer herstellung |
DE3144661A1 (de) * | 1981-11-10 | 1983-05-19 | Wacker-Chemie GmbH, 8000 München | Heizplatte |
DE3219392A1 (de) * | 1982-05-24 | 1983-12-01 | Gruenzweig Hartmann Glasfaser | Waermedaemmplatte fuer die lagerung einer elektrischen heizwendel, sowie verfahren zu ihrer herstellung |
DE3275804D1 (en) * | 1982-10-20 | 1987-04-23 | Elpag Ag Chur | Electric heating device for ranges or cooking plates |
DE3502497A1 (de) * | 1985-01-25 | 1986-07-31 | Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen | Heizvorrichtung, insbesondere fuer eine strahlungsbeheizte kochplatte, sowie verfahren zu ihrer herstellung |
DE3800676A1 (de) * | 1988-01-13 | 1989-07-27 | Eichenauer Gmbh & Co Kg F | Heizvorrichtung, insbesondere als kochplatte |
DE3935031A1 (de) * | 1989-10-20 | 1991-04-25 | Wacker Chemie Gmbh | Strahlungsheizeinheit |
DE4202569C2 (de) * | 1992-01-30 | 1995-09-21 | Porotherm Daemmstoffe Gmbh | Formwerkzeuge zum Pressen von Dämmschalen |
DE4322941C1 (de) * | 1993-07-09 | 1995-01-12 | Porextherm Daemmstoffe Gmbh | Wärmedämmkörper und Verfahren zu dessen Herstellung |
DE4331702A1 (de) * | 1993-09-17 | 1995-03-23 | Wacker Chemie Gmbh | Strahlungsheizkörper, insbesondere zum Beheizen einer glaskeramischen Kochplatte |
GB2323507B (en) * | 1997-03-21 | 2000-11-29 | Ceramaspeed Ltd | Electric heater unit and method of manufacture |
US6150643A (en) * | 1999-06-08 | 2000-11-21 | Koyo Thermo Systems Co., Ltd. | Insulating material, electrical heating unit employing same, and manufacturing method therefor |
GB2357232A (en) * | 1999-09-29 | 2001-06-13 | Ceramaspeed Ltd | Further insulating dish/insulation interface in an electric heater |
PT107101A (pt) | 2013-08-02 | 2015-02-02 | Univ De Coimbra | Painéis flexíveis de aerogel hidrofóbico reforçado com feltro de fibras |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2808338A (en) * | 1952-12-18 | 1957-10-01 | Johns Manville | Thermal insulating bodies and method of manufacture |
US2811457A (en) * | 1952-12-18 | 1957-10-29 | Johns Manville | Inorganic bonded thermal insulating bodies and method of manufacture |
US3055831A (en) * | 1961-09-25 | 1962-09-25 | Johns Manville | Handleable heat insulation shapes |
US3636309A (en) * | 1970-11-19 | 1972-01-18 | Gen Motors Corp | Ceramic-top cooking assembly fracture detector |
CH544044A (de) * | 1971-10-26 | 1973-11-15 | Bolliger Werner | Verfahren zur Herstellung einer Brandschutzfolie |
DE2165569C3 (de) * | 1971-12-30 | 1986-05-28 | E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen | Elektrokochgerät mit einer oberen Platte aus hochwärmebeständigem glasartigem bzw. keramischem Material |
GB1433478A (en) * | 1972-08-05 | 1976-04-28 | Mcwilliams J A | Electrical heating apparatus |
DE2500586A1 (de) * | 1975-01-09 | 1976-07-15 | Ego Elektro Blanc & Fischer | Elektrokochgeraet |
DE2729930C2 (de) * | 1977-07-02 | 1993-02-18 | E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen | Verfahren zur Herstellung eines elektrischen Strahlungs-Heizelementes |
DE2551137C2 (de) * | 1975-11-14 | 1986-04-24 | E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen | Elektrischer Strahlungsheizkörper für Glaskeramikkochplatten |
GB1580909A (en) * | 1977-02-10 | 1980-12-10 | Micropore Internatioonal Ltd | Thermal insulation material |
ZA774922B (en) * | 1977-03-09 | 1978-06-28 | Emerson Electric Co | Open coil heater |
DE2748307C2 (de) * | 1977-10-27 | 1982-06-09 | Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen | Wärmedämmplatte und Verfahren zu ihrer Herstellung |
DE2804407C3 (de) * | 1978-02-02 | 1980-12-04 | Kueppersbusch Ag, 4650 Gelsenkirchen | Speicherheizplatte |
DE2812247B2 (de) * | 1978-03-21 | 1981-06-19 | Ako-Werke Gmbh & Co., 7988 Wangen | Elektrische Kochplatte |
DE2820139A1 (de) * | 1978-05-09 | 1979-11-15 | Karl Fischer | Elektrischer heizkoerper |
DE2946476A1 (de) * | 1979-11-17 | 1981-05-27 | Consortium für elektrochemische Industrie GmbH, 8000 München | Waermedaemmformkoerper und verfahren zu seiner herstellung |
-
1980
- 1980-05-29 DE DE3020326A patent/DE3020326C2/de not_active Expired
-
1981
- 1981-05-22 AT AT81103958T patent/ATE9255T1/de not_active IP Right Cessation
- 1981-05-22 EP EP81103958A patent/EP0041203B2/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0041203A1 (fr) | 1981-12-09 |
EP0041203B2 (fr) | 1988-06-08 |
DE3020326C2 (de) | 1985-12-19 |
DE3020326A1 (de) | 1981-12-03 |
ATE9255T1 (de) | 1984-09-15 |
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Effective date: 19811030 |
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Owner name: SOCIETA' ITALIANA BREVETTI S.P.A. |
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GRAA | (expected) grant |
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