US3854021A - Electromagnetic heating system which includes an automatic shielding mechanism and method for its operation - Google Patents

Electromagnetic heating system which includes an automatic shielding mechanism and method for its operation Download PDF

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Publication number
US3854021A
US3854021A US00380188A US38018873A US3854021A US 3854021 A US3854021 A US 3854021A US 00380188 A US00380188 A US 00380188A US 38018873 A US38018873 A US 38018873A US 3854021 A US3854021 A US 3854021A
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United States
Prior art keywords
tray
shield
cavity
oven
combination
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Expired - Lifetime
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US00380188A
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English (en)
Inventor
D Moore
W Leyers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SPX Technologies Inc
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Chemetron Corp
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Priority to US00380188A priority Critical patent/US3854021A/en
Priority to BE141057A priority patent/BE811192R/fr
Application granted granted Critical
Publication of US3854021A publication Critical patent/US3854021A/en
Assigned to CHEMETRON PROCESS EQUIPMENT, INC. reassignment CHEMETRON PROCESS EQUIPMENT, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE MARCH 24, 1980. Assignors: CHEMETRON-PROCESS EQUIPMENT, INC.,
Assigned to AMCA INTERNATIONAL CORPORATION, DARTMOUTH NATIONAL BANK BLDG., HANOVER, NEW HAMPSHIRE, 03755, A CORP. reassignment AMCA INTERNATIONAL CORPORATION, DARTMOUTH NATIONAL BANK BLDG., HANOVER, NEW HAMPSHIRE, 03755, A CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CHEMETRON PROCESS EQUIPMENT, INC. A DE CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H05B6/766—Microwave radiation screens for windows
    • 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
    • H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors

Definitions

  • the present invention relates to electromagnetic heating systems and, more particularly, to systems which selectively heat various elements of a load'such as a complete meal or the like in a single operation.
  • the present invention provides a combination for moving a shield over certain food items or the like by inserting a tray conveying those items into an oven and to a method for its operation.
  • a typical meal normally includes some food items which require heating before they may be served and other food items which are preferably served cold.
  • the salad and dessert portions of a meal are preferably served cold.
  • the main entree of a meal is preferably served hot. If a meal includes coffee or tea, the coffee or tea is preferably served very hot.
  • a conventional oven ordinarily supplies heat energy to every portion of the meal.
  • any food item that is completely enclosed inan electrically conductive wrapper or shield is not heated. It is therefore possible to heat acomplete meal in a microwave oven without heating, for example, a dessert such as ice .cream that is wrapped in aluminum foil.
  • wrapping all itmes such as desserts, salads, and beverages such as milk in foil adds considerably to the cost of preparing a meal.
  • Difficulties may also arise any time a shielded item is placed into an electromagnetic oven because the shield distorts the electromagnetic field within the oven. Arcing can also result, especially if the shielding has any sharp edges or is positioned adjacent a conductive wall of the oven chamber.
  • An objectof this invention is the automatic shielding of some of the objects in an oven from heating'in the oven.
  • a primary object of the present invention is to provide a mechanism which automatically shields some of equivalent means.
  • the tray is supported by the items on a tray from electromagnetic energy when the tray is inserted into an electromagnetic oven.
  • a further object of the invention is provision of a position-sensing mechanism arranged to respond to the final location of the shield and tray within the oven.
  • a still further object of the invention is provision of a mechanism which gives forth an audible warning and disables the oven until the problem is corrected when the shield is not properly seated against the tray.
  • a further object of the invention is provision of a method for heating objects to a non-uniform temperature in accord with a controlled energy distribution and object placement in the oven.
  • an electromagnetic oven system for heating materials carried on a tray comprising an oven cavity having conductive walls and an open end for receiving trays inserted therein, a door to open and close said open end, means for directing microwave energy into said cavity, a conductive shield mounted for movement in said cavity between an open tray-receiving position and a closed position shielding a portion of a tray inserted in said cavity from microwave energy therein, and actuator means responsive to the insertion of a tray into said cavity for moving said shield from said open to said shielding position.
  • the invention includes the method of heating objects in a'cavity adapted to receive heating amounts of microwave energy comprising the steps of locating the objects in a predetermined array on a tray, lowering a shield over the objects in response to the insertion of the tray in the cavity and heating those objects not within the shield.
  • the method includes the steps of securing the shield and activating a heating circuit in response to closing of the door'to the cavity.
  • the invention also includes the steps of grouping to gether items which are to be heated in a first region called a heating zone, and assembling items which are not to be heated in a second region called a protected zone.
  • the items are arranged on a tray whereon the heating zone is an L-shaped region which partially-surrounds the protected zone.
  • This shield may comprise a box-like structure that .is hingedly mounted within the oven and that is drawn down into position either by the motion of the tray into theoven, by the closure of the oven door, or by other a conductive shelf or bottom wall of the oven which also serves as a bottom wall for the box-like shield.
  • the back and side conductive walls of the oven may also cooperate with the shield, if desired.
  • FIG. 1 is a front perspective view of a microwave oven constructed in accordance with the teachings of the invention and showing the shield in a raised positron;
  • FIG. 2 is a perspective view of the shield which is shown hingedly mounted within the oven of FIG. 1 and which is automatically brought into position to shield certain food items resting upon the tray shown in FIG.
  • FIG. 2A is a front, elevational view of the shield shown in FIG. 2;
  • FIG. 3 is an isometric view of a tray for use in the oven shown in FIG; 1, additionally adapted to cooperate with the shield shown in FIG. 2, and also carrying a ferrite oven control element;
  • FIGS. 4 and 5 are sectional views of the oven shown in FIG. 1 taken along the lines 44 in FIG. 1 to illustrate the manner whereby the shield shown in FIG. 2 is brought down into place to protect items upon a tray that is inserted into the oven;
  • FIG. 6 is a front sectional view taken along the lines 6-6 in FIG.-5 to illustrate engagement of the shield shown in FIG. 2 with upstanding flanges upon a tray and the oven bottom to minimize the amount of electromagnetic radiation which reaches the shielded items placed upon the tray;
  • FIG. 7 is a right-hand sectional view of the oven shown in FIG. 1 taken along the section lines 7+7 to show the mechanical mechanism which is actuated when the oven door is closed and which secures the shield into protecting-position within the oven.
  • Thepreferred embodiment of the invention is a modified version of a conventional microwave oven.
  • a suitable oven is a system 70/80 MenuMaster oven sold by the Atherton Division of Litton Industries, Inc., Minneapolis, Minnesota, but other conventional microwave ovens may also be used in constructing the invention.
  • an oven 100 having electrically conductive walls to accept food items distributed over a tray as described below.
  • the back wall 101 of the oven has sockets 102 and 104 between which extends a movable tongue 106.
  • the floor 108 of the oven 100 is constructed from an electrically conductive non-magnetic material.
  • the oven floor and back wall cooperate with the shield 200 to form a substantially closed, electrically conductive enclosure.
  • An angle 109 secured to the floor and extending up and across the back wall 101 acts as a guide for the tray and aids to seal the shield 200 shown supported by the tongue 106 which is raised byspring biasing means.
  • Dotted lines 120 indicate elements of the control mechanism which cooperate with a sensor on the tray to control oven operation.
  • Indicator lamps -1 16 118, and 119 disclose the" condition of the oven operating sequence.
  • Hook 402 assists in supporting the door 112 and also operates elements of the interlock mechanism as discussed further below.
  • Bracket 208 secures the shield to tongue 106.
  • Leaf spring 206 depends within the shield and, in part, Iowers the shield when a tray is in the oven.
  • the shield 200 has its lower edge 212 coated with an electrical insulator 210, e.g., Teflon tape to prevent arcs from forming between the shield 200 and the angle 109, upstanding flanges on the tray 310 and 312 or the strip 318 (FIG. 3).
  • the shield 200 is so arranged within the oven 100 that when lowered into position over a tray, it creates a region shielded from the electromagnetic radiation that .is developed within the oven 100.
  • Portions of the corners 214 and 216 are provided with contours which complement the edges of the tray against which it is located in the protecting position.
  • a plurality of leaf springs of similar configuration to spring 206 may assist in lowering the shield.
  • the bracket 208 may be formed integrally with the top of the shield.
  • the tray 300 shown in a preferred embodiment in FIG. 3, has an upper side 301 and edges 301A.
  • An L- shaped conductive strip 318 on its upper side 301 supports a pair of conductive, upstanding flanges 310 and 312 which in part define zones 302, 304, and 306 within which load items may be placed and provide coupling to the cavity floor for microwave energy. Since the flanges 310 and 312 engage the shield 200 on opposite surfaces, it is necessary to have the two flanges 310 and 312 separated from one another by a notch 322.
  • the flanges 310 and 312 in the L-shaped strip 318 have dimensions, including radii, which are selectedto 'reduce field concentrations and to effect an electromagnetic energy seal with the floor of the oven and -with the front and side wall of the shield 200.
  • the body of the tray is constructed from polyester fiber glass which has excellent mechanical strength but only fair dielectric properties.
  • Barrier 319 serves to direct load items to locations where they will not interfere with the lowering of the shield.
  • a ferrite sensor 308 is cemented or otherwise attached to each of the trays 300 and is part of the oven control system.
  • a cover 314 overlies the sensor 308 to provide mechanical protection in addition to regulating the amount of microwave energy which reaches the sensor.
  • tongue 106 extends outwardly from the oven back wall and engages bracket 208 upon the top of the shield 200.
  • the tongue is rigidly attached to a shaft 416 (FIGS. 4, 5 and 7) which runs the length of the back wall 101 of the oven 100 and which is mounted at its two ends by means not I shown which permit the shaft 416 to rotate.
  • the shaft 416 is also rigidly attached to a lever 412 (FIGS. 4, 5, and 7) which extends forwardly along the right-hand wall of the oven 100 (see FIG. 4).
  • a first spring 414 normally biases the lever 412 to apply an angular
  • FIG. 2 depicts the shield 200 which is shown pivotally torque to the shaft 416 which tends to rotate the tongue 1 06 upwards within the oven.
  • a stop (not shown) limits the upward motion of the tongue 106.
  • the biasapplied to the lever 412 by the spring 414 causes the tongue 106 to hold the shield 200 normally suspended in air when no tray is present.
  • FIG. 7 A crank 406 mounted to rotate about its support 407 is connected by chain 408 to a hook 402 mounted on the door 112. Tension spring 420 opposes the action of the chain. The end 409 of the crank is connected by spring 410 to the lever 412. A SPDT switch 418 is' mounted for actuation by the lever 412 and a normally open switch 422 is located for actuation by the end 409 of the crank 406. The normally open contacts of the switch 418 are connected into the oven control circuit and the normally closed contacts are in an alarm circuit with contacts of the switch 422.
  • food itmes are arranged on a tray so that items not to be heated are all placed within the protected zone 303; food items to be heated are placed within one of the heating zones 302, 304 and306.
  • the leading edge 320 of the tray engages the leaf spring 206 and draws the sheild 200 down substantially over the region 303 on the tray.
  • the tensionof the spring 414 is relatively weak and is easily overcome when a tray 300 presses against the leaf spring 206 that is attached to the shield 200. Since the tray is moving rearwardly at the same time that the leading lower edge 212 of the shield 200. is moving through a rearwardly-directed are, both the tray 300 and the lower edge 212 are simultaneously moving in the same direction, so that the edge'212 moves almost straight down relative to the tray 300 and does not strike food items 326 positioned toward the front of the tray.
  • the shield 200 were brought into position only by closure of the oven door 112 and not by motion of the tray 300, then therearwardly-directed arcthrough which the leading edge 212 of the sheild 200 swings would sweep over the heating region of the tray, possibly striking against taller food items positioned in that region.
  • the action of the' leaf spring 206 eliminates this problem and allows larger items to be placed upon the tray than would otherwise be possible. If the leaf spring 206 is omitted from the shield 200, then the shield 200 is brought downwards over the tray 300 by the tongue 106 which is actuated by the closure of the oven door 112.
  • the leaf spring 206 flexes and does not permit the shield 200 or the food item to be damages.
  • the relatively weak leaf spring 206 need not completely seat the shield 200 upon the tray 300 as .a separate dooractuated lever mechanism is provided for that purpose.
  • a hook 402 attachedvto the door 112 pulls on a chain 408 to stretch a spring 420 and rotate the crank 406 so that the crank 406 applies no tension to the spring 410.
  • the spring 410 thus has no effect upon the lever 412 when the oven door 112 is open.
  • heating of the food items within the zones 302, 304 and 306 commences.
  • the interior of the oven is flooded with microwave energy at a frequency of 2,450 megacycles generated by a conventional magnetron microwave energy source.
  • HEATING lamps 116 on the front of the oven are illuminated to signal that microwave energy is,"in fact, being supplied to the oven.
  • a SERVE lamp 1 19 automatically comes on to signal that the tray may be removed from the oven.
  • the oven door 112 is opened by grasping and pulling down on the handle '114 and the tray 300 is removed from the oven 100.
  • rials carried on a tray comprising an oven cavity having electrically conductive walls and an open end for receiving trays inserted therein, a door to open and close .said open end, means for directing microwave energy 'into said cavity, an electrically conductive shield mounted'for movement in said cavity between an open tray receiving position and a closed position, means including said shield when in said closed position and cooperating with the bottom wall of said cavity to provide substantial shielding of a portion of a tray inserted in said cavity from microwave energy therein, and actuator means for moving said shield from said open to said closed position.
  • said actuator means includes linkage means interconnecting said door and said shield and switch means responsive to said linkage whereby said switch assumes a heating enabling position when a tray is properly shielded in said oven.
  • the oven system of claim 1 including means for detachably and pivotally interconnecting said shield and a rear wall of said cavity, said actuator means including an element detachably engaging said shield for operatively interconnecting the same with said linkage means.
  • said actuator means includes a tongue extending into said cavity from said rear wall and having a free outer end, said shield including attachment means for receiving the free end of said tongue.
  • said shield includes opposed side walls each having a lower edge, a strip in conductive relation with the bottom wall of said cavity and adapted to interfit in side by side shielding relation with a lower edge of at least one of said side walls when said shield is in saidclosed position.
  • the oven system of claim 1 in combinationwith said tray, said oven cavity having a conductive bottom wall for supporting said tray and a rear wall adjacent one edge thereof, said tray including a conductive strip on the upper surface thereof outlining at least a part of said portion to be shielded, and said shield having at least a front wall with a lower edge positioned adjacent said conductive strip when the shield is in said closed position.
  • said actuator means includes a depending spring within said shield for engaging the edge of a tray as it is inserted in said oven cavity from said open end for moving said shield from said open toward said closed position.
  • said actuator means includes second linkage means interconnecting said door and said shield for biasing said shield'forcefully against an inserted tray in response to closing of said door.
  • the method of heatingiobjects in a cavity adapted to receive microwave energy comprisingthe steps of locating the objects in a predetermined array on a tray, lowering a shield over the objects in response. to insertion of the tray in the cavity, and heating those objects not within the shield.
  • the method of claim 13 including the step of securing said shield in position over a tray in said cavity, and activating a heating circuit in response to closing a door to the cavity.
  • An electromagnetic oven system for heating selected materials on a tray comprising an oven cavity having an opening for receiving trays, a door to open and close said opening, means defining a horizontal conductive tray support in said cavity, means for supplying microwave energy to said cavity, an electrically conductive shield mounted for movement in said cavity between an open tray receiving position and a closed position, means including said shield when in said closed position and cooperating with said tray support to provide substantial total shielding of a portion of a tray inserted in said cavity from microwave energy therein, and actuator means for moving said shield from said open to said closed position.
  • said conductive means includes a thin conductive strip secured to said tray and positioned to be in the vicinity of the bottom edge of said shield when said shield is in said closed position.
  • An electromagnetic oven system for heating selected materials on a tray comprising, an oven cavity having an opening for receiving trays, means for supplying microwave energy to said cavity, and shielding means at least a portion of which is attached to and positioned within said cavity for substantially totally shielding a portion of a tray positioned in said cavity from microwave energy therein.
  • said movable shield portion includes conductive side and front walls, the bottom edges of which are positionedover said tray when saidshield portion is in said closed position, thereby to define said totally shielded portion of said tray.
  • said shielding means includes .a rear wall of said cavity which cooperates with said movable shield portion to define said totally shielded'portion of said tray.
  • said shielding means includes a conductive tray support within said cavity which cooperates with said movable shield portion to define said totally shielded portion of said tray.
  • An electromagnetic oven system for heating selected materials on a tray comprising, an oven cavity having an opening for receiving trays, means for supplying microwave energy to said cavity, means for positioning a tray at a predetermined location within said cavity, and shieldingmeans at least a portion of which remains in said cavity while a plurality of trays are successively positioned within said cavity for substantially completely shielding a portion of a tray positioned at said predetermined location in said cavity from microwave energy therein.
  • the method of selectively heating objects in a cavity adapted to receive microwave energy comprising the steps of, locating the objects in a predetermined array on a tray with at least one of said objects in a predetermined area of said tray which is unshielded when outside said cavity, inserting said tray with said objects located thereon into a predetermined area of said cavity, substantially completely shielding said area of a tray when located in said predetermined area of said cavity against microwave energy therein, and supplying microwave energy to said cavity to heat those objects outside said shielded portion of said tray.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
US00380188A 1973-07-18 1973-07-18 Electromagnetic heating system which includes an automatic shielding mechanism and method for its operation Expired - Lifetime US3854021A (en)

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US00380188A US3854021A (en) 1973-07-18 1973-07-18 Electromagnetic heating system which includes an automatic shielding mechanism and method for its operation
BE141057A BE811192R (fr) 1973-07-18 1974-02-18 Four electromagnetique de chauffage automatique et simultane a temperatures diverses de produits de nombre et dimension varies

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941967A (en) * 1973-09-28 1976-03-02 Asahi Kasei Kogyo Kabushiki Kaisha Microwave cooking apparatus
US3974353A (en) * 1973-05-18 1976-08-10 Teckton, Inc. Conveyorized microwave oven
US4027132A (en) * 1975-04-17 1977-05-31 Levinson Melvin L Microwave pie baking
US4037479A (en) * 1975-12-01 1977-07-26 Chemetron Corporation Method and apparatus for sensor assembly inspection
US4126777A (en) * 1975-05-05 1978-11-21 Chemetron Corporation Method of automatically rethermalizing previously prepared food for consumption
US4330696A (en) * 1978-04-17 1982-05-18 Plastics, Inc. Portable turntable for ovens
US4335292A (en) * 1979-05-09 1982-06-15 Matsushita Electric Industrial Co., Ltd. High frequency oven with drawer type door
WO1984000462A1 (fr) * 1982-07-12 1984-02-02 Plastics Inc Unite motrice d'entrainement et plaque tournante l'utilisant
US4471195A (en) * 1980-08-07 1984-09-11 Tokyo Shibaura Denki Kabushiki Kaisha Food receptacle for microwave ovens
US4504715A (en) * 1978-07-25 1985-03-12 Northland Aluminum Products, Inc. Portable turntable for use in microwave ovens
US4558198A (en) * 1984-12-03 1985-12-10 Aluminum Company Of America Metal container system for use in microwave ovens
US4560850A (en) * 1984-12-03 1985-12-24 Aluminum Company Of America Container with steam port for use in microwave ovens
US4567341A (en) * 1984-08-02 1986-01-28 James River-Norwalk, Inc. Side vented and shielded microwave pizza carton
US4600822A (en) * 1983-07-19 1986-07-15 Sanyo Electric Co., Ltd. Microstripline for use in microwave heating
US4647745A (en) * 1982-07-12 1987-03-03 Plastics, Inc. Drive motor assembly and turntable utilizing the same
US4754111A (en) * 1980-03-18 1988-06-28 Plastics, Inc. Portable turntable for ovens
US4762973A (en) * 1985-09-10 1988-08-09 Alfa Institut Fur Hauswirtschafliche Produkt-Und Verfahrens-Enwicklung Gmbh Microwave oven with a hinged cover to seal a cooking container
GB2201070A (en) * 1987-01-13 1988-08-17 Christopher John Cobham Smail Microwave cooking
US4788397A (en) * 1982-07-12 1988-11-29 Plastics, Inc. Drive motor assembly and turntable utilizable the same
US4851631A (en) * 1986-10-23 1989-07-25 The Pillsbury Company Food container for microwave heating and method of substantially eliminating arching in a microwave food container
US4886948A (en) * 1978-04-17 1989-12-12 Plastics, Inc. Portable turntable with shielded drive motor for microwave ovens
US5393960A (en) * 1991-08-23 1995-02-28 Socamel S.A. Device for the transport and distribution of meal trays, including integral microwave oven for re-heating the latter
US5550356A (en) * 1994-06-20 1996-08-27 Tripp; Gregory A. Food covering device for use with a microwave oven
US5801363A (en) * 1994-06-20 1998-09-01 Michaluk, Iii; Mitchell Microwave oven with built-in food covering mechanism
US7596885B2 (en) 2006-07-28 2009-10-06 Corning Incorporated Microwave drying of ceramic structures
US20090272737A1 (en) * 2006-01-30 2009-11-05 Timothy Vinnicombe Receptacle
US20220325898A1 (en) * 2019-08-07 2022-10-13 Sharp Kabushiki Kaisha Heating cooking apparatus

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Publication number Priority date Publication date Assignee Title
US2600566A (en) * 1949-11-23 1952-06-17 Jr Frank Wesley Moffett Method of heating frozen food packages
US3219460A (en) * 1962-11-20 1965-11-23 Lever Brothers Ltd Frozen food package and method for producing same
US3547661A (en) * 1968-10-07 1970-12-15 Teckton Inc Container and food heating method
US3615713A (en) * 1969-09-12 1971-10-26 Teckton Inc Selective cooking apparatus
US3657508A (en) * 1970-11-18 1972-04-18 Western Electric Co Method of and radiant energy transmissive member for reflow soldering

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600566A (en) * 1949-11-23 1952-06-17 Jr Frank Wesley Moffett Method of heating frozen food packages
US3219460A (en) * 1962-11-20 1965-11-23 Lever Brothers Ltd Frozen food package and method for producing same
US3547661A (en) * 1968-10-07 1970-12-15 Teckton Inc Container and food heating method
US3615713A (en) * 1969-09-12 1971-10-26 Teckton Inc Selective cooking apparatus
US3657508A (en) * 1970-11-18 1972-04-18 Western Electric Co Method of and radiant energy transmissive member for reflow soldering

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974353A (en) * 1973-05-18 1976-08-10 Teckton, Inc. Conveyorized microwave oven
US3941967A (en) * 1973-09-28 1976-03-02 Asahi Kasei Kogyo Kabushiki Kaisha Microwave cooking apparatus
US4027132A (en) * 1975-04-17 1977-05-31 Levinson Melvin L Microwave pie baking
US4126777A (en) * 1975-05-05 1978-11-21 Chemetron Corporation Method of automatically rethermalizing previously prepared food for consumption
US4126776A (en) * 1975-05-05 1978-11-21 Chemetron Corporation Method of preparing food items for subsequent rethermalization in a microwave oven
US4037479A (en) * 1975-12-01 1977-07-26 Chemetron Corporation Method and apparatus for sensor assembly inspection
US4330696A (en) * 1978-04-17 1982-05-18 Plastics, Inc. Portable turntable for ovens
US4886948A (en) * 1978-04-17 1989-12-12 Plastics, Inc. Portable turntable with shielded drive motor for microwave ovens
US4504715A (en) * 1978-07-25 1985-03-12 Northland Aluminum Products, Inc. Portable turntable for use in microwave ovens
US4335292A (en) * 1979-05-09 1982-06-15 Matsushita Electric Industrial Co., Ltd. High frequency oven with drawer type door
US4754111A (en) * 1980-03-18 1988-06-28 Plastics, Inc. Portable turntable for ovens
US4471195A (en) * 1980-08-07 1984-09-11 Tokyo Shibaura Denki Kabushiki Kaisha Food receptacle for microwave ovens
US4647745A (en) * 1982-07-12 1987-03-03 Plastics, Inc. Drive motor assembly and turntable utilizing the same
WO1984000462A1 (fr) * 1982-07-12 1984-02-02 Plastics Inc Unite motrice d'entrainement et plaque tournante l'utilisant
US4788397A (en) * 1982-07-12 1988-11-29 Plastics, Inc. Drive motor assembly and turntable utilizable the same
US4600822A (en) * 1983-07-19 1986-07-15 Sanyo Electric Co., Ltd. Microstripline for use in microwave heating
US4567341A (en) * 1984-08-02 1986-01-28 James River-Norwalk, Inc. Side vented and shielded microwave pizza carton
US4558198A (en) * 1984-12-03 1985-12-10 Aluminum Company Of America Metal container system for use in microwave ovens
US4560850A (en) * 1984-12-03 1985-12-24 Aluminum Company Of America Container with steam port for use in microwave ovens
US4762973A (en) * 1985-09-10 1988-08-09 Alfa Institut Fur Hauswirtschafliche Produkt-Und Verfahrens-Enwicklung Gmbh Microwave oven with a hinged cover to seal a cooking container
US4851631A (en) * 1986-10-23 1989-07-25 The Pillsbury Company Food container for microwave heating and method of substantially eliminating arching in a microwave food container
GB2201070A (en) * 1987-01-13 1988-08-17 Christopher John Cobham Smail Microwave cooking
US5393960A (en) * 1991-08-23 1995-02-28 Socamel S.A. Device for the transport and distribution of meal trays, including integral microwave oven for re-heating the latter
US5550356A (en) * 1994-06-20 1996-08-27 Tripp; Gregory A. Food covering device for use with a microwave oven
US5660755A (en) * 1994-06-20 1997-08-26 Michaluk, Iii; Mitchell Microwave oven with built-in food covering mechanism
US5801363A (en) * 1994-06-20 1998-09-01 Michaluk, Iii; Mitchell Microwave oven with built-in food covering mechanism
US20090272737A1 (en) * 2006-01-30 2009-11-05 Timothy Vinnicombe Receptacle
US7596885B2 (en) 2006-07-28 2009-10-06 Corning Incorporated Microwave drying of ceramic structures
US20220325898A1 (en) * 2019-08-07 2022-10-13 Sharp Kabushiki Kaisha Heating cooking apparatus
US12259139B2 (en) * 2019-08-07 2025-03-25 Sharp Kabushiki Kaisha Heating cooking apparatus

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Publication number Publication date
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