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US2961520A - Domestic appliance - Google Patents

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Publication number
US2961520A
US2961520A US65025957A US2961520A US 2961520 A US2961520 A US 2961520A US 65025957 A US65025957 A US 65025957A US 2961520 A US2961520 A US 2961520A
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Prior art keywords
enclosure
shelf
metal
glass
oven
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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 - Lifetime
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George B Long
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Motors Liquidation Co
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Motors Liquidation Co
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B6/00Heating by electric, magnetic, or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/72Radiators or aerials
    • H05B6/725Rotatable antennas
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B6/00Heating by electric, magnetic, or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/6402Aspects relating to the microwave cavity
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B6/00Heating by electric, magnetic, or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/72Radiators or aerials

Description

Nov. 22, 1960 G. a. LONG DOMESTIC APPLIANCE Filed April 2, 1957 llWf/VTOR GfOfi GE B. LONG 5 y W Hi5 ATTOBNE United States Patent DOMESTIC APPLIANCE George B. Long, Dayton, Ohio, assignor to General Motors Corporation, Detroit, Mich, a corporation of Delaware Filed Apr. 2,1957, Ser. No. 650,259 Claims. (Cl. 219-1055) This invention relates to a domestic appliance and more particularly to domestic electric ovens in which the electromagnetic high frequency waves of the order of 915 or 2500 megacycles are used to rapidly cook foods.

Such ovens have the capability of cooking foods in a minute or two, but a number of difficulties have been encountered in addition to teaching this new method of cooking. One of the ditficulties has been that parts of a food load such as a roast or a cake are well-done or overdone, while other parts are underdone. Allegedly, this is due to the presence of hot spots and cold spots within the oven. Attempts have been made to combat this difiiculty with stirrers, rotating antennas and various forms of wave guides. While these procedures provide means for reducing the difficulties, they have not eliminated them.

It is an object of this invention to obtain even and uniform cooking and baking in an electronic oven, particularly in the region wherein roasts and cakes are normally baked. i

It is another object of this invention to provide a more even voltage. gradient throughout the region of the food to be cooked or baked. i i

It is another object of this invention to provide a simple means within an electronic oven which will shift and alter the wave pattern and eliminate hot and cold spots.

It is another object of this invention to provide a simple, inexpensive improved metal spring gasket readily applied to and retained upon the door jamb for grounding the door to the door jamb for preventing arcing and also for preventing the escape of radio frequency Waves.

These and other objects are attained in the form of the invention shown in the drawing in which the microwave cooking device is provided with an electron discharge device of the magnetron type located beneath the oven provided with a rotating antenna driven by the blower motor. Above the rotating antenna is a horizontal bar-type metal shelf provided with relatively widely spaced bars, which is supported upon guideways of electrical insulating material mounted upon the sidewalls of the oven. This shelf may support materials to be heated, cooked, baked or roasted. Spaced above the bar shelf is a second horizontal shelf of regular plate glass which may be supported on similar guideways of electrical insulating material fastened to the side walls of the oven. This sheet of plate glass may also be used to support material to be heated, cooked, baked or roasted. The plate glass is not transparent to the radio frequency energy but has an appreciable loss and a dielectric constant above 7. It acts to diffuse and change the wave pattern within the oven to reduce the hot spots and cold spots.

Further objects and advantages of the present inven- 2,961,520 Patented Nov. 22, 1960 tion will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is clearly shown.

In the drawings:

Figure 1 is a front view, partly in section and partly diagrammatic, showing a microwave oven embodying one form of my invention; and

Figure 2 is a horizontal fragmentary sectional view taken along the line 2-2 of Figure 1.

Referring now to the drawing, there is shown a micro wave oven 20 provided with a metal enclosure 22 enclosing the oven compartment 23. The metal enclosure 22 has an outwardly curled flange 24 which holds the curled inner edge 26 of a thin spring metal gasket 28. The curled inner edge of the gasket is held firmly beneath the outwardly curled flange 24. The gasket 28 is provided with an outwardly bulged portion 30 connecting with the inner curled portion 26 and having rearwardly extending tongues 32 extending through slots 34 in the door-jamb 36. The door 38 closes against the outwardly bulged portion 30 which yields to the high spots so that a substantially tight contact is made throughout with the inner face of the door. On the front wall of the oven above the oven compartment 24 are the various control 40.

Beneath the oven compartment there is provided a compartment 42 for the electron discharge device 44 of 915 megs. This device is of the magnetron type and includes a coaxial transmission line 46 and a double outlet blower 48 having an outlet 50 discharging below the electron discharge device 44, and an upper discharge outlet 52 discharging into the transmission line 46 above the discharge device 44. The transmission line 46 includes an inner conductor 54 extending up into the hollow bottom of the rotating conductor 56. The rotating conductor 56 is rotatably mounted upon the lower and upper insulating bearings 58 and 60 provided within the transmission line 46. The blower 48 is provided with a small pulley 62 which, through the belt 64 and the selectively located pulley 66, rotates the conductor portion 56. The conductor portion 56 and the coaxial transmission line 46 extend through an aperture in the bottom wall of the metal enclosure 22. Within the oven compartment the conductor portion 56 is provided with a rotating antenna 68 having arms of a quarter and a half wavelength.

Spaced above the antenna 68 is a horizontal shelf 70 made of parallel steel bars fastened to a perimeter bar. This shelf 70 is slidably supported in the guides 72 fixed to the side walls of the metal enclosure 22. These guides 72 are of low loss electrical insulating material and of such dimension and location so as to prevent arcing between the metal shelf 70 and the metal enclosure 22. The side walls of the enclosure 22 are provided with similar guides 74, 76 and 78 spaced at different heights above the guides 72 within the oven. The bar shelf 70 is a matching device to electromagnetically match, radiate, distribute and make uniform the electromagnetic waves. However, I find that there are hot spots and cold spots within the oven. According to my invention, spaced above the bar-type shelf 70 is a shelf 80 of regular A plate soda lime glass which has a higher loss and different properties than quartz and high quartz glass which are practically transparent to radio frequency waves. It has a composition containing less than of SiO This has a dielectric constant between 7 and 7%. It has a relatively high loss factor (which varies with the frequency in megacycles) as high as .059. The average composition may be as follows:

I find that this plate glass shelf gets only slightly warm from the wave energy it absorbs. It, however, does appear, if properly located, to minimize the hot and cold spots and apparently provides a more even voltage gradient and more uniform wave distribution. It also seems to prevent cancellation in same areas. For example, a hot spot pattern in a food load can be shifted by the introduction of this material. Perhaps it performs as an impedance matching medium to limit intense microwave field concentration. The glass shelf 80 may be used to support a reinforced polyester pan 82 containing the material 84 for baking a cake. The shelf 70 may also support a receptacle 86 containing material to be heated, baked or roasted. The plate glass shelf 80 appears to have an effect upon the wave pattern both above and below. The plate glass 80 may be placed also vertically or at various angles and positions to obtain the uniformity and distribution desired.

While the form of embodiment of the invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted, as may come within the scope of the claims which follow.

What is claimed is as follows:

1. A microwave cooking device including a metal enclosure, means for radiating radio frequency energy into the interior of said enclosure, a metal shelf having openings therein within said enclosure, electrical insulating means between the adjacent portions of said shelf and said enclosure, and a sheet of glass having an Si content of less than A and a relatively high loss factor extending between the walls of said enclosure for changing the Wave pattern of the radio frequency energy within said enclosure.

2. A microwave cooking device including a metal enclosure, means for radiating radio frequency energy into the interior of said enclosure, and a sheet of soda lime glass having an SiO content of less than A and a relatively high loss factor extending between the walls of said enclosure with the central portions of the sheet spaced away from the walls for changing the wave pattern of the radio frequency energy within said enclosure.

3. A microwave cooking device including a metal enclosure, means for radiating radio frequency energy into the interior of said enclosure, and a sheet of soda lime glass having an SiO content of less than and a relatively high loss factor extending between the walls of said enclosure for changing the wave pattern of the radio frequency energy within said enclosure, said sheet of glass extending horizontally for supporting material to be cooked.

4. A microwave cooking device including a metal enclosure, means for radiating radio frequency energy into the interior of said enclosure, a metal shelf having openings therein within said enclosure, electrical insulating means between the adjacent portions of said shelf and said enclosure, and a sheet of glass having an Si0 content of less than and a relatively high' loss factor extending between the walls of said enclosure for changing the wave pattern of the radio frequency energy within said enclosure, said radiating means being located at the bottom of said enclosure, said shelf and glass being located in spaced horizontal planes located one above the other.

5. A microwave cooking device including a metal enclosure, means for radiating radio frequency energy into the interior of said enclosure, a metal shelf having openings therein within said enclosure, and a sheet of soda lime glass having Si0 content of less than and a relatively high loss factor extending between the walls of said enclosure for changing the wave pattern of the radio frequency energy within said enclosure.

References Cited in the file of this patent UNITED STATES PATENTS 2,714,070 Welch July 26, 1955 2,762,893 Long et a1. Sept. 11, 1956 2,778,911 Valentine Jan. 22, 1957 2,782,292 Long Feb. 19, 1957 2,827,537 Haagensen Mar. 18, 1958 2,831,952 Warner Apr. 22, 1958 FOREIGN PATENTS 752,206 Great Britain July 4, 1956

US2961520A 1957-04-02 1957-04-02 Domestic appliance Expired - Lifetime US2961520A (en)

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Cited By (73)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127495A (en) * 1961-09-05 1964-03-31 Studebaker Corp Microwave oven
US3127494A (en) * 1961-03-13 1964-03-31 Studebaker Corp Microwave heating apparatus
US3172987A (en) * 1961-09-01 1965-03-09 Gen Electric Combination electric and electronic ovens
US3196243A (en) * 1963-02-26 1965-07-20 Raytheon Co High frequency heating system
US3218429A (en) * 1962-03-14 1965-11-16 Electrolux Ab Dielectric heating apparatus
US3265780A (en) * 1963-04-02 1966-08-09 Gen Motors Corp Method curing a foam insitu using a changing mode microwave generator
US3304400A (en) * 1960-03-04 1967-02-14 Husqvarna Vapenfabriks Ab Cooling arrangement for magnetrons
US3316380A (en) * 1964-04-30 1967-04-25 Gen Motors Corp Energy distribution detector for microwave oven
US3366769A (en) * 1964-12-11 1968-01-30 Philips Corp High frequency heating apparatus
US3436507A (en) * 1965-06-12 1969-04-01 Herbert August Puschner Device for heating nonmetallic materials,more particularly food-stuffs,by microwave energy in a cavity resonator
US3480753A (en) * 1968-02-16 1969-11-25 Robert G Wilson Electronic oven
US3526737A (en) * 1967-03-20 1970-09-01 Varian Associates Microwave heating apparatus
US3566066A (en) * 1968-08-30 1971-02-23 Dunlop Co Ltd Apparatus for heating articles
JPS4728249Y1 (en) * 1966-07-28 1972-08-26
JPS49106962U (en) * 1972-12-29 1974-09-12
US3855440A (en) * 1974-01-04 1974-12-17 Gen Electric Microwave oven having preferred modes
FR2236454A1 (en) * 1973-07-09 1975-02-07 Raytheon Co
JPS50116132U (en) * 1974-02-28 1975-09-22
JPS50131142A (en) * 1974-04-03 1975-10-17
US3936627A (en) * 1974-01-17 1976-02-03 General Electric Company Microwave oven with special rack designs
JPS5139848U (en) * 1974-09-19 1976-03-25
FR2295672A1 (en) * 1974-12-18 1976-07-16 Husqvarna Ab Applicator of microwave, particularly for food cooking ovens
DE2622173A1 (en) * 1975-05-19 1976-12-02 Matsushita Electric Ind Co Ltd A device for heating an object by means of high-frequency radiation, in particular microwave-oven
JPS51150135A (en) * 1975-06-18 1976-12-23 Hitachi Heating Appliance Co Ltd Microwave cooker
JPS5228149U (en) * 1975-08-18 1977-02-26
US4028519A (en) * 1976-02-26 1977-06-07 Roper Corporation Modular power supply and waveguide construction for microwave oven
US4028521A (en) * 1976-02-26 1977-06-07 Roper Corporation Antenna construction for microwave oven
US4028520A (en) * 1976-02-26 1977-06-07 Roper Corporation Air flow system for common cavity microwave oven
US4037071A (en) * 1976-04-19 1977-07-19 Dca Food Industries Inc. Method and apparatus for improved distribution of microwave power in a microwave cavity
JPS5295348A (en) * 1976-02-05 1977-08-10 Matsushita Electric Ind Co Ltd High-frequency heater
JPS52127648A (en) * 1976-04-20 1977-10-26 Matsushita Electric Ind Co Ltd High frequency heating equipment
JPS5314441A (en) * 1976-06-30 1978-02-09 Hitachi Heating Appliance Co Ltd Uniform heating method of high-frequency heater
US4091252A (en) * 1975-06-09 1978-05-23 Tokyo Shibaura Electric Co., Ltd. Microwave heating apparatus
JPS5388845U (en) * 1976-12-22 1978-07-21
JPS5388844U (en) * 1976-12-22 1978-07-21
US4131778A (en) * 1976-03-04 1978-12-26 Matsushita Electric Industrial Co., Ltd. Microwave oven
DE2844128A1 (en) * 1977-10-14 1979-04-19 Bosch Siemens Hausgeraete microwave oven
JPS5463543U (en) * 1977-10-14 1979-05-04
US4165454A (en) * 1975-11-07 1979-08-21 U.S. Philips Corporation Microwave oven
US4176266A (en) * 1976-02-02 1979-11-27 Hitachi, Ltd. Microwave heating apparatus
US4185181A (en) * 1976-10-18 1980-01-22 Hitachi Heating Appliances Co., Ltd. Microwave oven
US4223194A (en) * 1978-12-26 1980-09-16 General Electric Company Microwave oven with means for modifying energy distribution therein
FR2455711A1 (en) * 1979-05-04 1980-11-28 Bosch Siemens Hausgeraete high frequency stove
US4264804A (en) * 1979-11-30 1981-04-28 Emerson Electric Co. Electric heating elements
US4316069A (en) * 1979-12-03 1982-02-16 General Electric Company Microwave oven excitation system
US4335290A (en) * 1978-01-05 1982-06-15 Raytheon Company Microwave oven blower radiator
US4335289A (en) * 1978-12-21 1982-06-15 Amana Refrigeration, Inc. Microwave oven
DE2857841C1 (en) * 1977-10-14 1982-07-15 Bosch Siemens Hausgeraete microwave oven
US4342896A (en) * 1976-12-23 1982-08-03 Raytheon Company Radiating mode stirrer heating system
US4410779A (en) * 1978-04-03 1983-10-18 Raytheon Company Combination microwave oven control system
US4416906A (en) * 1979-04-27 1983-11-22 Golden Valley Foods Inc. Microwave food heating container
US4416907A (en) * 1981-07-13 1983-11-22 Golden Valley Foods Inc. Process for preparing food packages for microwave heating
US4455467A (en) * 1981-09-21 1984-06-19 General Electric Company Metal rack for microwave oven
US4458126A (en) * 1982-03-30 1984-07-03 General Electric Company Microwave oven with dual feed excitation system
US4556771A (en) * 1984-07-19 1985-12-03 Raytheon Company Microwave feed for common cavity oven
EP0367179A1 (en) * 1988-11-01 1990-05-09 Mitsubishi Denki Kabushiki Kaisha Heat cooking method and microwave heat cooking apparatus
US5097106A (en) * 1988-11-01 1992-03-17 Mitsubishi Denki Kabushiki Kaisha Frypan for both microwave and flame cooking
US5166485A (en) * 1988-11-01 1992-11-24 Mitsubishi Denki Kabushiki Kaisha Frypan for both microwave and flame cooking
USD610903S1 (en) 2007-03-02 2010-03-02 Conagra Foods Rdm, Inc. Container assembly
USD635816S1 (en) 2006-06-09 2011-04-12 Conagra Foods Rdm, Inc. Container basket
USD638701S1 (en) * 2010-09-08 2011-05-31 Conagra Foods Rdm, Inc. Container
USD639186S1 (en) 2010-09-08 2011-06-07 Conagra Foods Rdm, Inc. Container with sleeve
USD639656S1 (en) * 2010-09-08 2011-06-14 Con Agra Foods RDM, Inc. Container lid
US8302528B2 (en) 2005-10-20 2012-11-06 Conagra Foods Rdm, Inc. Cooking method and apparatus
USD680426S1 (en) 2012-06-12 2013-04-23 Conagra Foods Rdm, Inc. Container
US8613249B2 (en) 2007-08-03 2013-12-24 Conagra Foods Rdm, Inc. Cooking apparatus and food product
US8850964B2 (en) 2005-10-20 2014-10-07 Conagra Foods Rdm, Inc. Cooking method and apparatus
USD717162S1 (en) 2012-06-12 2014-11-11 Conagra Foods Rdm, Inc. Container
US8887918B2 (en) 2005-11-21 2014-11-18 Conagra Foods Rdm, Inc. Food tray
US9027825B2 (en) 2012-06-12 2015-05-12 Conagra Foods Rdm, Inc. Container assembly and foldable container system
US9132951B2 (en) 2005-11-23 2015-09-15 Conagra Foods Rdm, Inc. Food tray
US9211030B2 (en) 2005-10-20 2015-12-15 Conagra Foods Rdm, Inc. Steam cooking apparatus
US9676539B2 (en) 2013-05-24 2017-06-13 Graphic Packaging International, Inc. Package for combined steam and microwave heating of food

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* Cited by examiner, † Cited by third party
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US2714070A (en) * 1950-04-04 1955-07-26 Raytheon Mfg Co Microwave heating apparatus and method of heating a food package
GB752206A (en) * 1953-11-12 1956-07-04 Raytheon Mfg Co Improvements in or relating to high frequency dielectric heating apparatus
US2762893A (en) * 1952-07-17 1956-09-11 Gen Motors Corp Electronic oven with liquid collector
US2778911A (en) * 1952-08-12 1957-01-22 Gen Motors Corp Domestic appliance
US2782292A (en) * 1952-04-17 1957-02-19 Gen Motors Corp Domestic appliance
US2827537A (en) * 1953-11-12 1958-03-18 Raytheon Mfg Co Electronic heating apparatus
US2831952A (en) * 1958-04-22 warner

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US2831952A (en) * 1958-04-22 warner
US2714070A (en) * 1950-04-04 1955-07-26 Raytheon Mfg Co Microwave heating apparatus and method of heating a food package
US2782292A (en) * 1952-04-17 1957-02-19 Gen Motors Corp Domestic appliance
US2762893A (en) * 1952-07-17 1956-09-11 Gen Motors Corp Electronic oven with liquid collector
US2778911A (en) * 1952-08-12 1957-01-22 Gen Motors Corp Domestic appliance
GB752206A (en) * 1953-11-12 1956-07-04 Raytheon Mfg Co Improvements in or relating to high frequency dielectric heating apparatus
US2827537A (en) * 1953-11-12 1958-03-18 Raytheon Mfg Co Electronic heating apparatus

Cited By (86)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3304400A (en) * 1960-03-04 1967-02-14 Husqvarna Vapenfabriks Ab Cooling arrangement for magnetrons
US3127494A (en) * 1961-03-13 1964-03-31 Studebaker Corp Microwave heating apparatus
US3172987A (en) * 1961-09-01 1965-03-09 Gen Electric Combination electric and electronic ovens
US3127495A (en) * 1961-09-05 1964-03-31 Studebaker Corp Microwave oven
US3218429A (en) * 1962-03-14 1965-11-16 Electrolux Ab Dielectric heating apparatus
US3196243A (en) * 1963-02-26 1965-07-20 Raytheon Co High frequency heating system
US3265780A (en) * 1963-04-02 1966-08-09 Gen Motors Corp Method curing a foam insitu using a changing mode microwave generator
US3316380A (en) * 1964-04-30 1967-04-25 Gen Motors Corp Energy distribution detector for microwave oven
US3366769A (en) * 1964-12-11 1968-01-30 Philips Corp High frequency heating apparatus
US3436507A (en) * 1965-06-12 1969-04-01 Herbert August Puschner Device for heating nonmetallic materials,more particularly food-stuffs,by microwave energy in a cavity resonator
JPS4728249Y1 (en) * 1966-07-28 1972-08-26
US3526737A (en) * 1967-03-20 1970-09-01 Varian Associates Microwave heating apparatus
US3480753A (en) * 1968-02-16 1969-11-25 Robert G Wilson Electronic oven
US3566066A (en) * 1968-08-30 1971-02-23 Dunlop Co Ltd Apparatus for heating articles
JPS49106962U (en) * 1972-12-29 1974-09-12
FR2236454A1 (en) * 1973-07-09 1975-02-07 Raytheon Co
US3855440A (en) * 1974-01-04 1974-12-17 Gen Electric Microwave oven having preferred modes
US3936627A (en) * 1974-01-17 1976-02-03 General Electric Company Microwave oven with special rack designs
JPS5314435Y2 (en) * 1974-02-28 1978-04-17
JPS50116132U (en) * 1974-02-28 1975-09-22
JPS50131142A (en) * 1974-04-03 1975-10-17
JPS5321731B2 (en) * 1974-04-03 1978-07-04
JPS5139848U (en) * 1974-09-19 1976-03-25
FR2295672A1 (en) * 1974-12-18 1976-07-16 Husqvarna Ab Applicator of microwave, particularly for food cooking ovens
DE2622173A1 (en) * 1975-05-19 1976-12-02 Matsushita Electric Ind Co Ltd A device for heating an object by means of high-frequency radiation, in particular microwave-oven
US4476362A (en) * 1975-05-19 1984-10-09 Matsushita Electric Industrial Co., Ltd. High frequency heating apparatus
FR2312165A1 (en) * 1975-05-19 1976-12-17 Matsushita Electric Ind Co Ltd heater has high frequency
US4091252A (en) * 1975-06-09 1978-05-23 Tokyo Shibaura Electric Co., Ltd. Microwave heating apparatus
JPS51150135A (en) * 1975-06-18 1976-12-23 Hitachi Heating Appliance Co Ltd Microwave cooker
JPS5524485Y2 (en) * 1975-08-18 1980-06-12
JPS5228149U (en) * 1975-08-18 1977-02-26
US4165454A (en) * 1975-11-07 1979-08-21 U.S. Philips Corporation Microwave oven
US4176266A (en) * 1976-02-02 1979-11-27 Hitachi, Ltd. Microwave heating apparatus
JPS5295348A (en) * 1976-02-05 1977-08-10 Matsushita Electric Ind Co Ltd High-frequency heater
US4028519A (en) * 1976-02-26 1977-06-07 Roper Corporation Modular power supply and waveguide construction for microwave oven
US4028520A (en) * 1976-02-26 1977-06-07 Roper Corporation Air flow system for common cavity microwave oven
US4028521A (en) * 1976-02-26 1977-06-07 Roper Corporation Antenna construction for microwave oven
US4131778A (en) * 1976-03-04 1978-12-26 Matsushita Electric Industrial Co., Ltd. Microwave oven
US4037071A (en) * 1976-04-19 1977-07-19 Dca Food Industries Inc. Method and apparatus for improved distribution of microwave power in a microwave cavity
JPS52127648A (en) * 1976-04-20 1977-10-26 Matsushita Electric Ind Co Ltd High frequency heating equipment
JPS5314441A (en) * 1976-06-30 1978-02-09 Hitachi Heating Appliance Co Ltd Uniform heating method of high-frequency heater
US4185181A (en) * 1976-10-18 1980-01-22 Hitachi Heating Appliances Co., Ltd. Microwave oven
JPS5388844U (en) * 1976-12-22 1978-07-21
JPS5388845U (en) * 1976-12-22 1978-07-21
US4342896A (en) * 1976-12-23 1982-08-03 Raytheon Company Radiating mode stirrer heating system
DE2844128A1 (en) * 1977-10-14 1979-04-19 Bosch Siemens Hausgeraete microwave oven
JPS5934071Y2 (en) * 1977-10-14 1984-09-21
JPS5463543U (en) * 1977-10-14 1979-05-04
DE2857841C1 (en) * 1977-10-14 1982-07-15 Bosch Siemens Hausgeraete microwave oven
US4335290A (en) * 1978-01-05 1982-06-15 Raytheon Company Microwave oven blower radiator
US4410779A (en) * 1978-04-03 1983-10-18 Raytheon Company Combination microwave oven control system
US4335289A (en) * 1978-12-21 1982-06-15 Amana Refrigeration, Inc. Microwave oven
US4223194A (en) * 1978-12-26 1980-09-16 General Electric Company Microwave oven with means for modifying energy distribution therein
US4416906A (en) * 1979-04-27 1983-11-22 Golden Valley Foods Inc. Microwave food heating container
US4304974A (en) * 1979-05-04 1981-12-08 Matsushita Electric Industrial Co., Ltd. Energy supply structure for combined resistance heater for H. F. heater oven
FR2455711A1 (en) * 1979-05-04 1980-11-28 Bosch Siemens Hausgeraete high frequency stove
US4264804A (en) * 1979-11-30 1981-04-28 Emerson Electric Co. Electric heating elements
US4316069A (en) * 1979-12-03 1982-02-16 General Electric Company Microwave oven excitation system
US4416907A (en) * 1981-07-13 1983-11-22 Golden Valley Foods Inc. Process for preparing food packages for microwave heating
US4455467A (en) * 1981-09-21 1984-06-19 General Electric Company Metal rack for microwave oven
US4458126A (en) * 1982-03-30 1984-07-03 General Electric Company Microwave oven with dual feed excitation system
US4556771A (en) * 1984-07-19 1985-12-03 Raytheon Company Microwave feed for common cavity oven
EP0367179A1 (en) * 1988-11-01 1990-05-09 Mitsubishi Denki Kabushiki Kaisha Heat cooking method and microwave heat cooking apparatus
US5097106A (en) * 1988-11-01 1992-03-17 Mitsubishi Denki Kabushiki Kaisha Frypan for both microwave and flame cooking
US5166485A (en) * 1988-11-01 1992-11-24 Mitsubishi Denki Kabushiki Kaisha Frypan for both microwave and flame cooking
US8850964B2 (en) 2005-10-20 2014-10-07 Conagra Foods Rdm, Inc. Cooking method and apparatus
US8302528B2 (en) 2005-10-20 2012-11-06 Conagra Foods Rdm, Inc. Cooking method and apparatus
US9505542B2 (en) 2005-10-20 2016-11-29 Conagra Foods Rdm, Inc. Cooking method and apparatus
US9211030B2 (en) 2005-10-20 2015-12-15 Conagra Foods Rdm, Inc. Steam cooking apparatus
US8887918B2 (en) 2005-11-21 2014-11-18 Conagra Foods Rdm, Inc. Food tray
US9815607B2 (en) 2005-11-21 2017-11-14 Conagra Foods Rdm, Inc. Food tray
US9132951B2 (en) 2005-11-23 2015-09-15 Conagra Foods Rdm, Inc. Food tray
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