US3746823A - Electronic cooking appliance - Google Patents

Electronic cooking appliance Download PDF

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Publication number
US3746823A
US3746823A US00229790A US3746823DA US3746823A US 3746823 A US3746823 A US 3746823A US 00229790 A US00229790 A US 00229790A US 3746823D A US3746823D A US 3746823DA US 3746823 A US3746823 A US 3746823A
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Prior art keywords
wave guide
disk
cavity
set forth
central opening
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US00229790A
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English (en)
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L Whiteley
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Assigned to SCHROEDER, SIEGFRIED, RYAN, VIDAS, STEFFEY & ARRETT, P.A., A CORP. reassignment SCHROEDER, SIEGFRIED, RYAN, VIDAS, STEFFEY & ARRETT, P.A., A CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MODERN ELECTRONIC PRODUCTS, INC.
Assigned to SCHROEDER, SIEGFRIED, RYAN, VIDAS, STEFFEY & ARRETT, P.A., A CORP. reassignment SCHROEDER, SIEGFRIED, RYAN, VIDAS, STEFFEY & ARRETT, P.A., A CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMALGAMATED ENERGY CORPORATION
Anticipated expiration legal-status Critical
Assigned to GENERAL ELECTRIC CAPITAL CORPORATION reassignment GENERAL ELECTRIC CAPITAL CORPORATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SPECIALTY EQUIPMENT COMPANIES, INC., A DE CORP.
Assigned to SPECIALTY EQUIPMENT COMPANIES, INC. reassignment SPECIALTY EQUIPMENT COMPANIES, INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: GENERAL ELECTRIC CAPITAL CORPORATION
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/72—Radiators or antennas
    • H05B6/725—Rotatable antennas
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/688—Circuits for monitoring or control for thawing
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/705—Feed lines using microwave tuning
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/74—Mode transformers or mode stirrers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

  • ABSTRACT A magnetron is coupled to a wave guide having an open end exciting a transition section which is spproximatelytwo wavelengths square.
  • the transition section approximately two box is secured over the microwave cavity which has a circular opening formed in the top wall thereof.
  • a disk having a plurality of apertures or slots is rotatably supported beneath the upper cavity wall in close proximity thereto so that energy is radiated into the cavity in such a manner as to produce uniform and linear heating throughout the cavity
  • the apertures in the disk appear electrically at multiples of substantially half-wavelengths from the point of the magnetron coupling when the longder dimension of the apertures are transverse to the longitudinal dimension of the wave guide.
  • Microwave cooking or heating devices have been in existence for some time incorporating standing waves of high frequency energy which are directed into the oven cavity and reflected within the cavity to accomplish the heating or cooking process. Due to the nature of the standing waves, there are localized areas of high electric field intensity and localized areas of low electric field intensity within the oven cavity. Distribution of the microwave energy in this manner obviously results in relatively hot or cold spots within the cavity and generally speaking with a large area to be covered, such as in the baking process, unless the cold and hot spots are eliminated, the process using microwave energy does not perform the baking process in an acceptable manner. In fact, the true test of a microwave oven is to determine if it will bake rather than merely produce calized heating which may be acceptable in certain foods such as meats or smaller food items such as baked potatoes, cupcakes, and the thawing of certain small frozen foods.
  • some of the disclosures are directed to the use of more than a single stirrer, and some use motors having various speeds to drive the stirrers so as to create random reflections and thus tend to avoid introducing secondary or auxiliary hot and cold spots.
  • This technique is used even more extensively where the cavity may be thought of as including a double size or being energized by two different sources of microwave energy.
  • U. S. Pat. No. 3,439,143 discloses a microwave oven having a mode stirrer which is located within the wave guide rather than in the microwave oven cavity.
  • the inventor there suggests that changes within the wave guide have a much better chance of providing uniform distribution of energy within the cavity because the socalled paddle wheel stirrers have a limited effect in providing uniformity of heating.
  • the disclosure in the latter reference is directed to placing a rotatable element within the wave guide between two openings into the cavity such that when a reflective strip is placed upon the rotatable element, it will alternately act like a gate in producing an open condition and a shorted condition thus permitting energy to be alternately ap plied through the two openings and thus create a means of changing the standing wave patterns within the cavity.
  • This invention relates to the field of electronic cooking appliances and more particularly to a means of controlling the microwave radiation between the wave guide and a heating or cooking cavity.
  • the present invention recognized the deficiencies which have been prevalent in the art and from the background of the invention, it should also be apparent that the problems which various inventors have attempted to solve still remain.
  • the instant invention makes use of a magnetron which energized the wave guide in the dominant mode or the TE mode of operation.
  • the wave guide is connected to a transition wave guide or box along one of the side walls with the longitudinal axis of the wave guide intersecting the center point of the transition box Generally speaking, the transition section is approximately two wavelengths square.
  • the frequency of operation of the magnetron is at 2450 X Hz having a wavelength of approximately 4.81 inches.
  • a tuning stub is also used at an appropriate point in the transition section to tune the wave guide in such a manner that various loadings of the cavity will not affect the mode of operation of the magnetron.
  • the heating cavity is located directly below the transition box and is coupled to the transition box through an opening which is circular in nature, the upper wall of the cavity and lower wall of the wall guide transition section being common to each other.
  • a disk is rotatably secured in close proximity to the lower surface of the wall just described having the opening formed be tween the transition wave guide section or box and the cavity so that it may be considered that the disk and common wall are coplanar.
  • This disk is supported for rotation through the use of a non-metallic shaft which is supported above through the upper edge or wall of the transition wave guide section or box, the upper portion of the shaft being driven by a low speed motor which generally operates between approximately 13 to l8 revolutions per minute.
  • the disk is secured within the transition box along the longitudinal axis of the wave guide at a point representative of ap proximately two wavelengths.
  • the disk has a number of apertures formed therein which are elongated and sequentially oriented transverse to the longitudinal axis of the wave guide at multiples of half-wavelengths.
  • the load seen by the magnetron may be varied or modified by the position of the resonant stub and the disk is prevented from arcing with respect to the wall of the cavity or wave guide transition section through the use of a plurality of insulated spacers which prohibit the disk and the other surface from rubbing together.
  • FIG. 1 is a perspective view of the front of an electronic cooking appliance incorporating the invention
  • FIG. 2 is a back perspective view of the electronic cooking appliance with the outer cover removed;
  • FIG. 3 is a top plan view of the electronic cooking appliance with the cover removed exposing the transition section or feedbox and a portion of the disk;
  • FIG. 4 is a side elevation view of the electronic cooking appliance with the cover off as seen looking into the end of the wave guide;
  • FIG. 5 is a top plan view of the disk showing all of the details of the placement and size of the apertures formed therein;
  • FIG. 6 is a diagram showing the relationship of the standing wave patterns in the wave guide and transition box.
  • FIG. 1 discloses a microwave oven 10 which has a front panel to which is secured a door 12.
  • the oven has acabinet cover 13 which covers the rear portion of the oven.
  • Several oven controls 14 and 15 are also secured to the front panel 11.
  • FIG. 2 discloses the rear of microwave oven 10 where a magnetron 16 is coupled to a wave guide 17 in the normal manner for a TE mode of operation and further includes a shroud or housing 18 which is used to cool magnetron 16 through the use of a blower 20.
  • a power supply 21 is secured to the base plate of the oven and a junction box 22 is secured to the back of the base plate.
  • An oven cavity 23 is secured in the center of the microwave oven and secured to the upper portion of the cavity is a microwave transition section or box 24.
  • a motor 25 is secured to the upper portion of cavity 23 or the edge of transition section 24 to drive a pulley 26 through the use of a belt 27.
  • a tuning stub 28 is also secured in the upper edge of transition section 24, to insure that a proper standing wave ratio is obtained and that the magnetron 16 operates in the proper mode.
  • a wave guide adaptor 30 also helps secure wave guide assembly 17 to transition section 24. i
  • wave guide 18 is secured to the transition box 24 through suitable means such as bolts 31 which are secured through a side wall of box 24 and wave guide adaptor 30, bolts 31 being connected to a pair of brackets 32 and 33 which are secured to wave guide 18.
  • Wave guide 18 is connected in open-end fashion through an opening 34 formed in a side wall of transition box 24.
  • Wave guide 18 may include a transition section between wave guide adaptor 30 and a coupling point 35 which is located axially with the center hole ofa plurality of circular spaced ventilating holes 36.
  • magnetron 16 has an operating frequency of 2,450 X 10 Hz and the wave guide has a height of 2.25 inches where coupled to the magnetron and is reduced to a height of l inch where coupled to transition box 24.
  • the wave guide width is maintained at 3.75 inches. It will also be generally understood that the magnetron is coupled to the wave guide at a multiple of a guarter-wavelength from the closed end of the wave guide. The distance from the point of coupling to the wave guide from the magnetron to the end secured to transition box 24 is 5.002 inches.
  • Pulley 26 is coupled to a shaft 40 which is formed of a non-metallic material such as polypropylene.
  • a bushing 41 forms a journal for shaft 40 and is secured in the center at the top of the transition box 24.
  • Shaft 40 extends downwardly and is connected to a hub 42 which is secured to a disk 43. The distance from coupling point 35 to the position of the axis of shaft 40 along a longitudinal axis of wave guide 18 is approximately two wavelengths.
  • a plate 45 forms the upper wall of cavity 23 and has a central circular opening 46 formed therein. It is through this opening that shaft 40 extends to secure disk 43 at a position slightly below that of wall 45.
  • a plurality of insulated spacers 47 are secured between the bottom surface of plate 45 and disk 43, the spacers being approximately one-sixteenth inch in thickness and are disposed between the two surfaces to prevent arcing in the cavity.
  • plate 45 and disk 43 may be considered to be substantially coplanar.
  • Opening 46 has a smaller diameter than the diameter of disk 43. In the instant application, the cavity is 14 inches square and the sides of the transition.
  • a circular ring 48 is depressed in the top of transition box 24 having an outer radius of 2.375 inches and an inner radius of 1.60 inches, the central portion being depressed 0.38 inches, and a sloping portion 49 between the two radii joining the top with a curvature of 0.50 inch radius.
  • Disk 43 is shown in more detail in FIG. 5 wherein eight holes 50 are equally spaced around the rim of the disk at a diameter of 9 inches, the disk being formed of a metallic material such as aluminum and having a diameter of IO inches. Holes 50 are formed in disk 43 to accomodate the spacers 47 which are generally formed with a flange so that they may be pressed into holes 50 and held in place. Disk 43 contains threeelongated apertures 51 through 53 having a length of 2.31 inches and a fourth elongated aperture 54 having a length of 1.920 inches, all of the apertures being 0.250 inches wide. A pair of center lines 55 and 56 are representative of axes which are longitudinally and transversely oriented respectively with respect to the longitudinal axis of wave guide 18.
  • aperture 52 With the disk rotating counterclockwise as seen in FIGS. 3 and 5, aperture 52 would have been transverse to axis 55 just prior to the appearance of aperture 51 and in this position, aperture 52 is 1.50 wavelengths from the magnetron coupling point 35. Upon aperture 52 being oriented transverse to longitudinal axis 55 at a point 180 degrees from that shown in FIG. 5, aperture 52 will be approximately 2.47 wavelengths from coupling point 35.
  • Aperture 53 will appear electronically at a transverse position relative to axis 55 prior to apertures 52 and 51 and in so doing, will be oriented approximately l.95 wavelengths from magnetron coupling point 35 and when rotated 180 from such position, will then appear transverse to longitudinal axis 55 at approximately 2.02 wavelengths.
  • each of the transverse appearances of the apertures 51, 52, 53, and 54 with respect to the magnetron coupling point 35 is at a multiple ofa half-wavelength and thus maximum transfer of the energy through the apertures is achieved.
  • apertures 51 through'54 are aligned with their longitudinal axes parallel to the longitudinal axis 55, a minimum amount of energy will be transferred into cavity 23.
  • the microwave energy radiating through apertures 51 54 it will be observed that there is virtually no reflection from cavity 23 back towards the magnetron such as may be experienced when exciting a cavity with an open-ended or large aperture or iris formed in a wave guide.
  • FIG. 4 additionally discloses a front opening 60 which is closed through appropriate electrical sealing means by door 12 and a cooking or heating plane or shelf 61 is formed above a bottom member 62 of cavity 23.
  • Adequate ventilation vents 63 may be formed in cavity 23 by the appropriate forming of small holes in the side walls to allow the escape of cooking vapors without permitting microwave energy to escape therethrough.
  • the cooking cavity is 8.875 inches high with the shelf 61 being elevated 1.50 inches above floor 62, which means that the distance from disk 43 to shelf 61 is also a multiple of substantially half-wavelengths. In the present invention the distance is approximately one and one-half wavelengths.
  • ovens which are generally thought to be of double" cavity size, that is, where two different magnetrons are used to feed the oven cavity.
  • oven cavity width and length may be varied without regard to the general requirements of attempting to maintain some relationship to the operating frequency or wavelength.
  • the apertured disk 43 the radiation is directed into cavity 23 much like a sprinkler in which the sprinkler head is rotated so as to bathe everything within the cavity, In fact, tests have been made in which at least 16 containers were placed in the oven in a square pattern, each of the containers being formed of styrofoam and containing eight ounces of water.
  • the temperature of the water was measured initially in each of the containers and after the oven was excited for 1% minutes, the results indicated that after two tests, the difference between the highest and the lowest temperature was 29 F.
  • a similar test was run on a microwave oven embodying the state of the art at present using a cavity with a stirrer and after both tests had been completed, the difference between the highest and the lowest temperature was 21 F for the first test and 22 F for the second test. It was also observed that there was more usable energy in the instant invention than that embodying the present state of the art, and that the in stant invention produced power which was very close to the rated power rating whereas the oven embodying the present state of the art was considerably lower than the rated power.
  • An electronic cooking appliance comprising:
  • a microwave generator including coupling means for coupling microwave energy into a wave guide
  • a microwave cavity constructed and arranged to receive objects to be heated and having a central opening formed in one wall thereof;
  • a wave guide transition box disposed over said central opening in said cavity, said box and said cavity having walls forming a barrier to the transmission of microwave energy except through said central opening, said box having a wave guide opening formed in one wall thereof;
  • a wave guide operably connected between said microwave generator and the wave guide opening in said wave guide transition box for conducting microwave energy therebetween;
  • a disk rotatably supported about an axis substantially coaxial with said central opening and having a periphery extending outwardly at least to the periphery of said central opening in a plane substantially coplanar with the wall containing said central opening, said disk having at least one aperture therein distributing said microwave energy between said transition box and said cavity;
  • insulated spacers secured around the periphery of said disk and disposed between said disk and said wall of said cavity, said spacers eliminating arcing between said disk and said cavity wall.
  • a tuning element aligned parallel to said axis of rotation for said disk and disposed in a wall opposite that having said disk adjacent thereto and disposed to produce low microwave power variations for different loads placed in said microwave cavity.
  • An electronic cooking appliance comprising:
  • a microwave generator including coupling means for coupling microwave energy into a wave guide
  • a microwave cavity constructed and arranged to receive objects to be heated and having a central opening formed in one wall thereof;
  • a wave guide transition box disposed over said central opening in said cavity, said box and said cavity having walls forming a barrier to the transmission of microwave energy through said central opening, said box having a wave guide opening formed in one wall thereof;
  • a wave guide operably connected between said microwave generator and the wave guide opening in said wave guide transition box for conducting microwave energy therebetween;
  • a disk rotatably supported about an axis substantially coaxial with said central opening and having a periphery extending outwardly at least to the periphery of said central opening, said disk extending in a plane substantially coplanar with the wall containing said central opening, said disk having a plurality of apertures formed therein with elongated shapes of substantially parallel sides, of which the longer dimension when transverse to the longitudinal dimension of said wave guide appears at multiples of substantially half-wavelengths from said coupling means for distributing said microwave energy between said transition box and said cavity;
  • each of said plurality of apertures has a ratio of length to width of approximately 7.68 to 9.25.
  • a shelf defining a cooking plane disposed below said disk at a distance representative of substan tially a multiple of half-wavelengths.
  • said wave guide transition box includes an indented ring portion extending downwardly from the top of said box in a smooth curve.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Ovens (AREA)
US00229790A 1972-02-28 1972-02-28 Electronic cooking appliance Expired - Lifetime US3746823A (en)

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US22979072A 1972-02-28 1972-02-28

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092513A (en) * 1977-01-31 1978-05-30 Litton Systems, Inc. Stirrer hub assembly
FR2375791A1 (fr) * 1976-12-23 1978-07-21 Raytheon Co Dispositif de chauffage a agitateur de mode rayonnant
US4123643A (en) * 1977-05-31 1978-10-31 Whirlpool Corporation Air circulation system for microwave oven
FR2408271A1 (fr) * 1977-11-02 1979-06-01 Raytheon Co Four a hyperfrequences
FR2422113A1 (fr) * 1978-04-03 1979-11-02 Raytheon Co Four a chauffage combine electrique et par hyperfrequences
US4185181A (en) * 1976-10-18 1980-01-22 Hitachi Heating Appliances Co., Ltd. Microwave oven
DE2948314A1 (de) * 1978-12-01 1980-06-12 Raytheon Co Mikrowellenherd mit rotierbaren strahlern
US4314127A (en) * 1977-11-02 1982-02-02 Raytheon Company Microwave oven with rotating multiport radiator
US4316069A (en) * 1979-12-03 1982-02-16 General Electric Company Microwave oven excitation system
DE3117709A1 (de) * 1980-05-05 1982-02-25 Raytheon Co., 02173 Lexington, Mass. Mikrowellenzufuehrungseinrichtung fuer mikrowellenoefen
US4327266A (en) * 1980-09-12 1982-04-27 Amana Refrigeration, Inc. Microwave ovens for uniform heating
US4329557A (en) * 1979-12-07 1982-05-11 General Electric Company Microwave oven with improved energy distribution
US4335290A (en) * 1978-01-05 1982-06-15 Raytheon Company Microwave oven blower radiator
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
US4430538A (en) 1980-08-28 1984-02-07 Tokyo Shibaura Denki Kabushiki Kaisha High-frequency heating device
US4430539A (en) 1980-11-11 1984-02-07 Tokyo Shibaura Denki Kabushiki Kaisha High-frequency heating device
US4463239A (en) * 1982-12-06 1984-07-31 General Electric Company Rotating slot antenna arrangement for microwave oven
US4642435A (en) * 1985-12-26 1987-02-10 General Electric Company Rotating slot antenna arrangement for microwave oven
US4849592A (en) * 1987-02-03 1989-07-18 U.S. Philips Corp. Feeding arrangement for a microwave oven
US4967050A (en) * 1987-11-11 1990-10-30 Imanishi Kinzoku Kogyo Kabushiki Kaisha High frequency cooking device with ceiling mounted semi-spherical reflector
EP1062490A4 (fr) * 1998-02-10 2003-10-15 Denver Instr Co Analyseur d'humidite pour micro-ondes: procede et appareil
US6657171B1 (en) 2002-11-20 2003-12-02 Maytag Corporation Toroidal waveguide for a microwave cooking appliance
US6781102B1 (en) 2003-07-23 2004-08-24 Maytag Corporation Microwave feed system for a cooking appliance having a toroidal-shaped waveguide
US20140197163A1 (en) * 2013-01-16 2014-07-17 Standex International Corporation Microwave mode stirrer apparatus
US10993295B2 (en) 2015-09-30 2021-04-27 Corning Incorporated Microwave mode stirrer apparatus with microwave-transmissive regions

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909635A (en) * 1957-07-29 1959-10-20 Raytheon Co Electronic oven systems
US2920174A (en) * 1957-06-28 1960-01-05 Raytheon Co Microwave ovens
US3641301A (en) * 1969-09-10 1972-02-08 Mitsubishi Electric Corp Microwave oven

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920174A (en) * 1957-06-28 1960-01-05 Raytheon Co Microwave ovens
US2909635A (en) * 1957-07-29 1959-10-20 Raytheon Co Electronic oven systems
US3641301A (en) * 1969-09-10 1972-02-08 Mitsubishi Electric Corp Microwave oven

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185181A (en) * 1976-10-18 1980-01-22 Hitachi Heating Appliances Co., Ltd. Microwave oven
FR2375791A1 (fr) * 1976-12-23 1978-07-21 Raytheon Co Dispositif de chauffage a agitateur de mode rayonnant
US4342896A (en) * 1976-12-23 1982-08-03 Raytheon Company Radiating mode stirrer heating system
US4092513A (en) * 1977-01-31 1978-05-30 Litton Systems, Inc. Stirrer hub assembly
US4123643A (en) * 1977-05-31 1978-10-31 Whirlpool Corporation Air circulation system for microwave oven
FR2408271A1 (fr) * 1977-11-02 1979-06-01 Raytheon Co Four a hyperfrequences
US4314127A (en) * 1977-11-02 1982-02-02 Raytheon Company Microwave oven with rotating multiport radiator
US4335290A (en) * 1978-01-05 1982-06-15 Raytheon Company Microwave oven blower radiator
FR2422113A1 (fr) * 1978-04-03 1979-11-02 Raytheon Co Four a chauffage combine electrique et par hyperfrequences
US4410779A (en) * 1978-04-03 1983-10-18 Raytheon Company Combination microwave oven control system
FR2443025A1 (fr) * 1978-12-01 1980-06-27 Raytheon Co Four a hyperfrequences a elements rayonnants tournants
DE2948314A1 (de) * 1978-12-01 1980-06-12 Raytheon Co Mikrowellenherd mit rotierbaren strahlern
US4316069A (en) * 1979-12-03 1982-02-16 General Electric Company Microwave oven excitation system
US4329557A (en) * 1979-12-07 1982-05-11 General Electric Company Microwave oven with improved energy distribution
DE3117709A1 (de) * 1980-05-05 1982-02-25 Raytheon Co., 02173 Lexington, Mass. Mikrowellenzufuehrungseinrichtung fuer mikrowellenoefen
US4350859A (en) * 1980-05-05 1982-09-21 Raytheon Company Microwave oven feed system
US4430538A (en) 1980-08-28 1984-02-07 Tokyo Shibaura Denki Kabushiki Kaisha High-frequency heating device
US4327266A (en) * 1980-09-12 1982-04-27 Amana Refrigeration, Inc. Microwave ovens for uniform heating
US4430539A (en) 1980-11-11 1984-02-07 Tokyo Shibaura Denki Kabushiki Kaisha High-frequency heating device
US4463239A (en) * 1982-12-06 1984-07-31 General Electric Company Rotating slot antenna arrangement for microwave oven
US4642435A (en) * 1985-12-26 1987-02-10 General Electric Company Rotating slot antenna arrangement for microwave oven
US4849592A (en) * 1987-02-03 1989-07-18 U.S. Philips Corp. Feeding arrangement for a microwave oven
US4967050A (en) * 1987-11-11 1990-10-30 Imanishi Kinzoku Kogyo Kabushiki Kaisha High frequency cooking device with ceiling mounted semi-spherical reflector
EP1062490A4 (fr) * 1998-02-10 2003-10-15 Denver Instr Co Analyseur d'humidite pour micro-ondes: procede et appareil
US6657171B1 (en) 2002-11-20 2003-12-02 Maytag Corporation Toroidal waveguide for a microwave cooking appliance
US6781102B1 (en) 2003-07-23 2004-08-24 Maytag Corporation Microwave feed system for a cooking appliance having a toroidal-shaped waveguide
US20140197163A1 (en) * 2013-01-16 2014-07-17 Standex International Corporation Microwave mode stirrer apparatus
US10993295B2 (en) 2015-09-30 2021-04-27 Corning Incorporated Microwave mode stirrer apparatus with microwave-transmissive regions

Also Published As

Publication number Publication date
BE802410A (fr) 1973-11-16

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