Patent US4794233A successfully refreshed from Google Patents.
US4794233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiant heater
Assignee: EGO Elektro Geratebau GmbH
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Filing: 1987-09-18
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Granted: 1988-12-27
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Expires: 2007-09-18
Abstract
Abstract A radiant heater has a shallow shell-like support for carrying heating resistors and a glass ceramic top plate. A connection and hot warning indicating device is arranged in the space between the top plate and the support. The light source is preferably a low voltage tungsten halogen lamp which projects, at most, slightly beyond the front side of the support. Despite a very compact construction, the radiant heater is not subject to dazzle effects even over a large area, and a readily visible indicating illumination is obtained. The light source can be operated at different brightness levels, for example one brightness level indicating the switched-on condition of the heating resistor and the other brightness level indicating the hot-to-touch condition of the top plate, notwithstanding the switched-on or switched-off condition of the heating resistor.
Inventors
- 👤 Gerhard Goessler
- 👤 Eugen Wilde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:20
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/74; H05B3/748
Claims Analysis
Total Claims: 47
Claim 1
Independent Claim
131 words
A radiant heater adapted for use inside of an electric cooker having a top plate, said heater comprising: a support having an insulator member, the insulator member having a front side facing the top plate, said insulator member being made from an insulating material; at least one elongated heating resistor located substantially in a plane substantially parallel to the top plate, said heating resistor being located on the front side of said insulator member; and, an electric light source electrically connected as an indicating device separate from the heating resistor, said light source being located in the vicinity of the insulator member, wherein the electric light source is arranged to extend substantially into the vicinity of the front side of the insulator member and of the plane of the heating resistor.
Claim 2
Dependent Claim
131 words
A radiant heater adapted for use inside of an electric cooker having a top plate, said heater comprising: a support having an insulator member, the insulator member having a front side facing the top plate, said insulator member being made from an insulating material; at least one elongated heating resistor located substantially in a plane substantially parallel to the top plate, said heating resistor being located on the front side of said insulator member; and, an electric light source electrically connected as an indicating device separate from the heating resistor, said light source being located in the vicinity of the insulator member, wherein the electric light source is arranged to extend substantially into the vicinity of the front side of the insulator member and of the plane of the heating resistor.
Claim 3
Dependent Claim
29 words
A radiant heater according to claim 1, wherein the front side of the insulator member defines a front plane, the light source projecting to at least said front side.
Claim 4
Dependent Claim
47 words
A radiant heater according to claim 2, wherein the light source projects to one side over the front plane of the insulator member, said light source penetrating said front side of the insulator member, said front side and said heating resistor being spaced from the top plate.
Claim 5
Dependent Claim
41 words
A radiant heater according to claim 1, wherein said light source has at least one filament translucently encapsulated, said at least one filament of the light source being located between said front side of the insulator member and the top plate.
Claim 6
Dependent Claim
29 words
A radiant heater according to claim 4, wherein said at least one filament is located nearer to the front side of the insulator member than to the top plate.
Claim 7
Dependent Claim
44 words
A radiant heater according to claim 1, wherein said light source has an external width, and further comprising a light absorbing cover between the light source and the top plate, said light absorbing cover being larger than the external width of the light source.
Claim 8
Dependent Claim
24 words
A radiant heater according to claim 6, wherein said light absorbing cover extends in contact-free manner close to the inside of the top plate.
Claim 9
Dependent Claim
33 words
A radiant heater according to claim 6, wherein the light source has a translucent bulb body, said light absorbing cover extending in contact-free manner close to the bulb body of the light source.
Claim 10
Dependent Claim
27 words
A radiant heater according to claim 6, wherein said light absorbing cover is at least partly plate-like and at most substantially as thick as the top plate.
Claim 11
Dependent Claim
22 words
A radiant heater according to claim 6, wherein the light absorbing cover has a rim at least partly surrounding the light source.
Claim 12
Dependent Claim
12 words
A radiant heater according to claim 10, wherein said rim is dome-shaped.
Claim 13
Dependent Claim
21 words
A radiant heater according to claim 6, wherein said light absorbing cover has at least one opening defining a light passage.
Claim 14
Dependent Claim
27 words
A radiant heater according to claim 12, wherein said light absorbing cover has a rim and said at least one light passage is provided in said rim.
Claim 15
Dependent Claim
18 words
A radiant heater according to claim 6, wherein said light absorbing cover is constructed from an insulating material.
Claim 16
Dependent Claim
21 words
A radiant heater according to claim 14, wherein said light absorbing cover is constructed from a ceramic fiber containing insulating material.
Claim 17
Dependent Claim
18 words
A radiant heater according to claim 1, wherein the light source is formed by a low-tension current lamp.
Claim 18
Dependent Claim
17 words
A radiant heater according to claim 1, wherein the light source is formed by a tungsten-halogen bulb.
Claim 19
Dependent Claim
22 words
A radiant heater according to claim 1, wherein the light source is a bulb arranged at right angles to the top plate.
Claim 20
Dependent Claim
35 words
A radiant heater according to claim 1, wherein the light source is a bulb with a base adapted for insertion in a socket, and at most projecting slightly over a back side of the support.
Claim 21
Dependent Claim
15 words
A radiant heater according to claim 1, further comprising means for cooling the light source.
Claim 22
Dependent Claim
17 words
A radiant heater according to claim 20, wherein said cooling means has at least one ventilation shaft.
Claim 23
Dependent Claim
22 words
A radiant heater according to claim 21, wherein said ventilation shaft defines an inner wall surrounding the light source and spaced therefrom.
Claim 24
Dependent Claim
16 words
A radiant heater according to claim 21, wherein said ventilation shaft extends through said insulator member.
Claim 25
Dependent Claim
23 words
A radiant heater according to claim 21, wherein said ventilation shaft has a wider crossed-section at the back side of the insulator member.
Claim 26
Dependent Claim
16 words
A radiant heater according to claim 1, further comprising light guiding means for the light source.
Claim 27
Dependent Claim
30 words
A radiant heater according to claim 25, wherein the light guiding means is constructed for light guidance substantially circumferentially around the light source and substantially parallel to the top plate.
Claim 28
Dependent Claim
52 words
A radiant heater according to claim 25, wherein the light guiding means is constructed for light guidance substantially against an inner circumference of a support rim at least substantially extending up to the top plate and surrounding the heating resistor, said insulator member and said top plate together enveloping a heated space.
Claim 29
Dependent Claim
21 words
A radiant heater according to claim 27 wherein the support rim is formed by a profiled section of the insulator member.
Claim 30
Dependent Claim
24 words
A radiant heater according to claim 1, wherein the light source is directly electrically connected to switching contacts provided for switching the heating resistor.
Claim 31
Dependent Claim
20 words
A radiant heater according to claim 1 wherein the light source is electrically connected in parallel with the heating resistor.
Claim 32
Dependent Claim
29 words
A radiant heater according to claim 1, wherein the light source is electrically connected by at least one voltage tap provided in potentiometer-like manner directly on the heating resistor.
Claim 33
Dependent Claim
31 words
A radiant heater according to claim 1, wherein the light source is switched by means of at least on independent contact separate from switching contacts provided for switching the heating resistor.
Claim 34
Dependent Claim
24 words
A radiant heater according to claim 32 wherein said independent contact is a signal contact operated by a switch-on device for the heating resistor.
Claim 35
Dependent Claim
26 words
A radiant heater according to claim 32, further comprising a hot warning contact operated by a temperature sensor, said independent contact forming said hot warning contact.
Claim 36
Dependent Claim
23 words
A radiant heater according to claim 1, further comprising means for operating the light source in at least two different lighted switch positions.
Claim 37
Dependent Claim
20 words
A radiant heater according to claim 35 wherein the different switch positions for the light source define different brightness levels.
Claim 38
Dependent Claim
53 words
A radiant heater according to claim 35, wherein in one of said different switch positions the light source is switched via the heating resistor and in an other one of said different switch positions the light source is switched via the hot warning contact arranged in a line parallel to the signal contact.
Claim 39
Dependent Claim
37 words
A radiant heater according to claim 35, wherein in one switch position the light source has a lower brightness of the same filament controlled by means of a voltage reduction member than in the other switch position.
Claim 40
Dependent Claim
21 words
A radiant heater according to claim 38, wherein the filament has a lower brightness when switched via the hot warning contact.
Claim 41
Dependent Claim
18 words
A radiant heater according to claim 35, wherein at least two switch positions are associated with separate filaments.
Claim 42
Dependent Claim
22 words
A radiant heater according to claim 40, comprising a multifilament lamp wherein the separate filaments are arranged in a common bulb body.
Claim 43
Dependent Claim
19 words
A radiant heater according to claim 1, wherein said heating resistor is at least one substantially exposed heater coil.
Claim 44
Dependent Claim
17 words
A radiant heater according to claim 1, wherein said top plate is made from glass ceramic material.
Claim 45
Dependent Claim
123 words
A radiant heater adapted for use inside of an electric cooker having a top plate, said heater comprising: a support with an insulator member, the insulator member having a front side facing the top plate and being made from an insulating material; at least one elongated heating resistor located substantially in a plane substantially parallel to the top plate, said heating resistor being mounted on the front side of said insulator member; an electric light source electrically connected as an indicating device separate from the heating resistor said light source being located in the vicinity of the insulator member; and, a cover for the electric light source, said cover being constructed from the same insulating material as the insulator member of the support.
Claim 46
Dependent Claim
123 words
A radiant heater adapted for use inside of an electric cooker having a top plate, said heater comprising: a support with an insulator member, the insulator member having a front side facing the top plate and being made from an insulating material; at least one elongated heating resistor located substantially in a plane substantially parallel to the top plate, said heating resistor being mounted on the front side of said insulator member; an electric light source electrically connected as an indicating device separate from the heating resistor said light source being located in the vicinity of the insulator member; and, a cover for the electric light source, said cover being constructed from the same insulating material as the insulator member of the support.
Claim 47
Dependent Claim
17 words
A radiant heater according to claim 44 wherein said cover is made integrally with the insulator member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-27 | 1992-06-27 | 1992-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-27 | 1996-06-27 | 1996-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-27 | 2000-06-27 | 2000-12-27 | $7700.00 | Window Closed / Lapsed |