Patent EP0069298B1 successfully refreshed from Google Patents.
EP0069298B1
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EP
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Cooking plate
Assignee: EGO Elektro Geratebau GmbH
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Filing: 1982-06-25
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Granted: 1986-08-27
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Expires: 2002-06-25
Abstract
Abstract An electric hotplate has a hotplate body in the form of a thin ceramic substrate, to whose bottom surface is applied, e.g. by printing, a thin resistive material film. This resistive material film is covered by a protective coating, which prevents damage. Between the protective coating and the bottom tray of the hotplate is provided a thermal insulating layer. The hotplate has an extremely low thermal capacity, so that rapid preliminary cooking or boiling is possible with low power consumption.
Inventors
- 👤 Robert Kicherer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 15:11
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/74; H05B3/748; F; F24; F24C; F24C15/00; F24C15/10; F24C15/102
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
121 words
Hotplate with a flat hotplate body (17) having in the heated area a substantially planar top and bottom and which is made from good heat- conducting, electrically insulating material with a low expansion coefficient and high thermal cycling stability, as well as an electrical heating means applied to the bottom of the hotplate body (17) in the form of a resistance material layer film (27) subdivided into individual reciprocally insulated zones and has zones with different electrical surface loading, characterized in that the resistance value is matched by cross-sectional reduction, particularly with the aid of a lazer, the zones with different electrical surface loading being constructed in annular or circular manner and that the electrical surface loading rises to the outside.
Claim 2
Dependent Claim
121 words
Hotplate with a flat hotplate body (17) having in the heated area a substantially planar top and bottom and which is made from good heat- conducting, electrically insulating material with a low expansion coefficient and high thermal cycling stability, as well as an electrical heating means applied to the bottom of the hotplate body (17) in the form of a resistance material layer film (27) subdivided into individual reciprocally insulated zones and has zones with different electrical surface loading, characterized in that the resistance value is matched by cross-sectional reduction, particularly with the aid of a lazer, the zones with different electrical surface loading being constructed in annular or circular manner and that the electrical surface loading rises to the outside.
Claim 3
Dependent Claim
15 words
Hotplate according to claim 1, characterized in that the resistive film (27) is printed on.
Claim 4
Dependent Claim
15 words
Hotplate according to claim 1, characterized in that the resistive film (27) is evaporated on.
Claim 5
Dependent Claim
30 words
Hotplate according to one of the preceding claims, characterized in that the resistive film (27) is provided on its side opposite to the substrate with a mechanical protection coating (28).
Claim 6
Dependent Claim
16 words
Hotplate according to one of the preceding claims, characterized in that the ceramic substrate is coloured.
Claim 7
Dependent Claim
22 words
Hotplate according to one of the preceding claims, characterized in that a thermal insulation (26) is arranged below the resistive film (27).
Claim 8
Dependent Claim
34 words
Hotplate according to one of the preceding claims, characterized in that the electrical connections are brazed or hard soldered onto the resistive film (27) or an additional silver coating (35, 37) or silver-palladium coating.
Claim 9
Dependent Claim
38 words
Hotplate according to one of the preceding claims, characterized in that it has an overflow edge (12) and the pull relief of the electrical connections is provided by the downwardly directed leg (18) of the overflow edge (12).
Claim 10
Dependent Claim
53 words
Hotplate according to one of the preceding claims, characterized in that it has an overflow edge (12), whose downwardly directed leg (18) is provided with at least two bolts (19), which are used for fixing hotplate in a depression (11) with the aid of a thermally insulated fixing plate or bottom tray (20).
Claim 11
Dependent Claim
28 words
Hotplate according to one of the preceding claims, characterized in that the hotplate body (17) is tightly bonded into an overflow edge, preferably using a ceramic adhesive (25).
Claim 12
Dependent Claim
25 words
Hotplate according to claim 10, characterized in that the expansion coefficient of the overflow edge (12) is adapted to that of the hotplate body (17).
Claim 13
Dependent Claim
26 words
Hotplate according to one of the preceding claims, characterized in thatthe areas of the resistive film (27) are subdivided into circular or circular ring sectors (30).
Claim 14
Dependent Claim
20 words
Hotplate according to claim 12, characterized in that the sectors (30) alternately have cuts (32, 33, 34) on both sides.
Claim 15
Dependent Claim
27 words
Hotplate according to claims 12 or 13, characterized in that the two sectors (30) are constructed symmetrically to one another with respect to their dividing line (31).
Claim 16
Dependent Claim
37 words
Hotplate according to one of the preceding claims, characterized in that the resistive film is made from a cermet layer, platinum, rhodium or some other suitable metal is pulverulently admixed in oxide form in a glass frit.
Claim 17
Dependent Claim
42 words
Hotplate according to one of the preceding claims, characterized in that for electronic temperature control purposes, one or more thermal sensors are applied in the same screen printing process from a temperature-dependent substance with a negative (NTC) or positive (PTC) resistance coefficient.
References Cited (Backward Citations)
No citation records indexed.
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