US4575616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Domestic infra-red radiation oven
Assignee: Electrolux AB
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Filing: 1983-02-03
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Granted: 1986-03-11
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Expires: 2003-02-03
Abstract
Abstract A domestic oven has upper and lower infra-red radiation sources. The upper radiation source includes at least one or two radiation elements emitting radiation in the range of 1.0-1.4 micro meters. The lower radiation source is a meandering tube element emitting long wave radiation in the range of 3-6 micro meters.
Inventors
- 👤 Lars R. G. Bergendal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:34
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/04; F24C7/046
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
159 words
In a domestic oven having a generally parallelepiped oven space with walls of a material which is highly reflective of infra-red radiation, one side wall being a door, and an upper and a lower radiation source arranged at top and bottom walls repectively of the oven, the radiation sources emitting infra-red radiation and a supporting surface substantially transparent to the radiation and arranged between the two radiation sources and adapted to support an oven load, the upper radiation source being arranged to emit short-wave IR-radiation with a peak performance in a wavelength range of 1.0 to 1.4 μm, the improvement wherein the upper radiation source is comprised of at least one straight rod-shaped quartz-tube radiation element having an active length and being in a plane parallel to the top wall of the oven, the oven having a vertical distance from the rod-shaped radiation element to said supporting surface that is 40-70% of the active length of the radiation element.
Claim 2
Dependent Claim
159 words
In a domestic oven having a generally parallelepiped oven space with walls of a material which is highly reflective of infra-red radiation, one side wall being a door, and an upper and a lower radiation source arranged at top and bottom walls repectively of the oven, the radiation sources emitting infra-red radiation and a supporting surface substantially transparent to the radiation and arranged between the two radiation sources and adapted to support an oven load, the upper radiation source being arranged to emit short-wave IR-radiation with a peak performance in a wavelength range of 1.0 to 1.4 μm, the improvement wherein the upper radiation source is comprised of at least one straight rod-shaped quartz-tube radiation element having an active length and being in a plane parallel to the top wall of the oven, the oven having a vertical distance from the rod-shaped radiation element to said supporting surface that is 40-70% of the active length of the radiation element.
Claim 3
Dependent Claim
64 words
An oven according to claim 1, wherein the lower radiation source is a tube element placed above a flat reflector at a distance from the reflector which is less than 15 mm, the tube element being in a plane parallel to the reflector and to said supporting surface (17) supporting the vessel and at a distance less than 30 mm from the supporting surface.
Claim 4
Dependent Claim
33 words
An oven according to claim 2, wherein the tube element has a mass less than 7 g/dm tube length with a load of at least 3 Watts per square centimeter of its surface.
Claim 5
Dependent Claim
26 words
An oven according to claim 2 or claim 3, wherein the vessel has a size and shape to cover both the tube element and the reflector.
Claim 6
Dependent Claim
77 words
An oven according to claim 1, wherein the oven space has two side walls spaced apart a given distance and the upper radiation source is comprised of two radiation elements disposed symmetrically and parallel relative to one another and to the two side walls of the oven, the side walls having the same reflection coefficient, the radiation elements being spaced apart with a distance therebetween of from 40 and 60% of said distance between the side walls.
Claim 7
Dependent Claim
82 words
An oven according to claim 1, wherein the oven space has two side walls spaced apart a given distance and the upper radiation source is composed of three radiation elements disposed symmetrically in the oven and parallel relative to one another and to the two side walls of the oven, the two side walls having the same reflection coefficient and the radiation elements being spaced apart with a distance therebetween of from 30 and 50% of said distance between the side walls.
Claim 8
Dependent Claim
89 words
An oven according to claim 1, wherein the oven space has two side walls with a distance therebetween and the upper radiation source is comprised of two radiation elements disposed symmetrically and parallel relative to one another and to the two side walls, the two side walls having reflection coefficients being 0.4 and 0.8, one side wall comprising the door and having a lower reflection coefficient than the opposed side wall, the radiation elements further being spaced apart between 45 and 65% of the distance between the side walls.
Claim 9
Dependent Claim
46 words
An oven according to claim 1, wherein the door has an inspection glass and a fixed blind-like screen arranged for allowing inspection of the oven space and at the same time for preventing direct radiation of the upper radiation source from escaping through the inspection glass.
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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) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |