EP0099705A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Microwave ovens and methods of cooking food
Assignee: Microwave Ovens Ltd
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Filing: 1983-07-08
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Granted: —
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Expires: 2003-07-08
Abstract
Abstract A portable microwave oven is designed to be powered from a domestic power socket with a rating not exceeding 1800 watts for the US market, or not exceeding 3000 watts for the UK market. The oven comprises a microwave generator (17) for supplying microwave power to a cavity of the oven, a thermal heating element (8) capable of heating the air within the oven cavity, a fan (7) for forcing a recirculating flow of air over the heating element (8) and through the cavity and a control circuit operative to supply continuous microwave power to the oven cavity simultaneously with the supply of thermal power to the cavity. The microwave power heats the inside of the food and the thermal power dissipates the resulting moisture and browns the external surface of the food.
Inventors
- 👤 Kenneth Ian Eke
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 04:16
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/647; H05B6/6482; H05B6/6408; H05B6/6411; H05B6/6447; H05B6/645
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
163 words
A portable microwave oven designed to be powered from a domestic power socket with a rating not exceeding 1800 watts, comprising a microwave generator for supplying microwave power to a cavity of the oven, a rotatable turntable on the base of the cavity, thermal heating means capable of heating the air within the oven cavity, and control means operative to supply continuous microwave power to the oven cavity simultaneously with the supply of thermal power to the cavity, whereby the microwave power heats the inside of the food and the thermal power dissipates the resulting moisture and browns the external surface of the food, the thermal heating means comprising an electrical heating element and fan means for recirculating air over the element and through the cavity, the fan means causing a forced flow of air, heated by the thermal heating means, to enter the cavity from one side thereof, to pass over the turntable and leave the cavity from the other side thereof.
Claim 2
Dependent Claim
163 words
A portable microwave oven designed to be powered from a domestic power socket with a rating not exceeding 1800 watts, comprising a microwave generator for supplying microwave power to a cavity of the oven, a rotatable turntable on the base of the cavity, thermal heating means capable of heating the air within the oven cavity, and control means operative to supply continuous microwave power to the oven cavity simultaneously with the supply of thermal power to the cavity, whereby the microwave power heats the inside of the food and the thermal power dissipates the resulting moisture and browns the external surface of the food, the thermal heating means comprising an electrical heating element and fan means for recirculating air over the element and through the cavity, the fan means causing a forced flow of air, heated by the thermal heating means, to enter the cavity from one side thereof, to pass over the turntable and leave the cavity from the other side thereof.
Claim 3
Dependent Claim
72 words
A microwave oven according to claim 1, wherein the oven cavity has a rear wall behind which is a compartment accommodating the electrical heating element, the rear wall having on said one side an aperture allowing hot air to be forced by the fan to enter the cavity over a substantial height thereof, and the rear wall having adjacent the bottom corner at the other side a fan constituting said fan means.
Claim 4
Dependent Claim
29 words
A microwave oven according to claim 1 or 2, wherein the power rating of the oven does not exceed 1620 watts, which allows a margin for US power limits.
Claim 5
Dependent Claim
25 words
A microwave oven according to claim 3, wherein the thermal heating means produces 1250 watts and the microwave generator produces 200 watts in the cavity.
Claim 6
Dependent Claim
43 words
A microwave oven according to claim 3 or 4, wherein the microwave generator is capable of operating at a high or low level, an interlock ensuring that the microwave generator is on the low power level whenever the electrical heating element is energised.
Claim 7
Dependent Claim
163 words
A portable microwave oven designed to be powered from a domestic power socket with a rating not exceeding 3000 watts comprising a microwave generator for supplying microwave power to a cavity of the oven, a rotatable turntable at the base of the cavity, thermal heating means capable of heating the air within the oven cavity, and control means operative to supply continuous microwave power to the oven cavity, simultaneously with the supply of thermal power to the cavity, whereby the microwave power heats the inside of the food and the thermal power dissipates the resulting moisture and browns the external surface of the food, the thermal heating means comprising an electrical heating element and fan means for recirculating air over the element and through the cavity, the fan means causing a forced flow of air, heated by the thermal heating means, to enter the cavity fron one side thereof, to pass over the turntable and leave the cavity from the other side thereof.
Claim 8
Dependent Claim
163 words
A portable microwave oven designed to be powered from a domestic power socket with a rating not exceeding 3000 watts comprising a microwave generator for supplying microwave power to a cavity of the oven, a rotatable turntable at the base of the cavity, thermal heating means capable of heating the air within the oven cavity, and control means operative to supply continuous microwave power to the oven cavity, simultaneously with the supply of thermal power to the cavity, whereby the microwave power heats the inside of the food and the thermal power dissipates the resulting moisture and browns the external surface of the food, the thermal heating means comprising an electrical heating element and fan means for recirculating air over the element and through the cavity, the fan means causing a forced flow of air, heated by the thermal heating means, to enter the cavity fron one side thereof, to pass over the turntable and leave the cavity from the other side thereof.
Claim 9
Dependent Claim
27 words
A microwave oven according to claim 6, wherein the power rating of the oven does not exceed 2700 watts, which allows a margin for UK power limits.
Claim 10
Dependent Claim
18 words
A microwave oven according to claim 7, wherein the microwave generator has low, medium and high power levels.
Claim 11
Dependent Claim
25 words
A microwave oven according. to claim 8, wherein the low, medium and high power levels correspond to 200, 300 and 600 watts into the cavity.
Claim 12
Dependent Claim
24 words
A microwave oven according to any of claims 6 to 9, wherein the electrical heating element has a power rating of substantially 1450 watts.
Claim 13
Independent Claim
136 words
A method of cooking food in a portable microwave oven designed to be powered from a domestic power socket with a rating either not exceeding 1800 watts, or not exceeding 3000 watts, comprising supplying continuous power to a cavity of the oven accommodating the food and simultaneously supplying thermal power to the cavity, whereby the microwave power heats the inside of the food and the thermal power dissipates the resulting moisture and browns the external surface of the food, the thermal power being applied by a recirculating flow of air which is forced by a fan to pass over an electrical heating element, to enter the oven cavity from one side thereof, to pass over the food whilst the latter is rotated on a turntable and to leave the oven cavity from the other side thereof.
Claim 14
Independent Claim
136 words
A method of cooking food in a portable microwave oven designed to be powered from a domestic power socket with a rating either not exceeding 1800 watts, or not exceeding 3000 watts, comprising supplying continuous power to a cavity of the oven accommodating the food and simultaneously supplying thermal power to the cavity, whereby the microwave power heats the inside of the food and the thermal power dissipates the resulting moisture and browns the external surface of the food, the thermal power being applied by a recirculating flow of air which is forced by a fan to pass over an electrical heating element, to enter the oven cavity from one side thereof, to pass over the food whilst the latter is rotated on a turntable and to leave the oven cavity from the other side thereof.
References Cited (Backward Citations)
No citation records indexed.
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