US2500752A - High-frequency dielectric heating in a resonant chamber - Google Patents
High-frequency dielectric heating in a resonant chamber Download PDFInfo
- Publication number
- US2500752A US2500752A US673724A US67372446A US2500752A US 2500752 A US2500752 A US 2500752A US 673724 A US673724 A US 673724A US 67372446 A US67372446 A US 67372446A US 2500752 A US2500752 A US 2500752A
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- chamber
- heating
- high frequency
- strip
- heated
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- 238000010438 heat treatment Methods 0.000 title description 26
- 239000000463 material Substances 0.000 description 12
- 239000004020 conductor Substances 0.000 description 10
- 239000003989 dielectric material Substances 0.000 description 6
- 230000005672 electromagnetic field Effects 0.000 description 6
- 229920001971 elastomer Polymers 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 239000005060 rubber Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 241000208125 Nicotiana Species 0.000 description 2
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 102100035683 Axin-2 Human genes 0.000 description 1
- 101700047552 Axin-2 Proteins 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 241000533293 Sesbania emerus Species 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
- H05B6/78—Arrangements for continuous movement of material
- H05B6/782—Arrangements for continuous movement of material wherein the material moved is food
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S99/00—Foods and beverages: apparatus
- Y10S99/14—Induction heating
Definitions
- Our invention relates to high frequency electric heating apparatus utilizing a chamber in which oscillating electromagnetic fields are produced, more particularly to apparatus for heating non-metallic or dielectric materials by electromagnetic fields and has for its object a simple, reliable and eflic'ient apparatus for heating 3J1? ticles and for heating material in the form of a continuous thread or strip or articles on a con veyor.
- a chamber which may be resonant or nonresonant and which has walls made of electrically conducting material, together with means for passing the material to be heated through the chamber. All dielectric materials, both organic and inorganic, may be heated for drying, hardening or other purposes, such as paper, fabrics, rubber, rayon, cellulose or other synthetic materials, food products, tobacco, ceramic materials, etc.
- Fig. l. of which "is a view in perspective of high frequency heating apparatus embodying our invention
- Fig. 2 is a View in perspective of a simplified form of our invention
- Fig. 3 is a View in perspective of a modified form of our invention
- Fig. 4 is a sectional view of a modified form of our invention.
- Fig. 1 of the drawing we have shown our invention in one form as applied to the heating of a strip I of flexible dielectric material, such as damp paper to be dried, which is moved horizontally and continuously at a predetermined speed along a predetermined path through the heating apparatus 2 by suitable feed and winding rolls and driving means (not shown) the strip 1 passing over guide rollers 3 and 4.
- a strip I of flexible dielectric material such as damp paper to be dried
- the heating apparatus 2 comprises a closed rectangular container 5 formed by walls of electrically conducting material, preferably copper. and provided with a slot 6 in opposite side walls near the bottom wall 1 through which slots the strip i passes through the chamber for heating inside the chamber.
- Electric power at a suitable high frequency is applied from electric supply means 8, which preferably is an electronic oscil-- lation generator, by a magnetic coupling or hair pin device 9 to a wave guide iii having walls made of an electrically conducting material such as copper bymeans oi graduallytapered walls to the upper wall of the chamber 5.
- electric supply means 8 which preferably is an electronic oscil-- lation generator
- a magnetic coupling or hair pin device 9 to a wave guide iii having walls made of an electrically conducting material such as copper bymeans oi graduallytapered walls to the upper wall of the chamber 5.
- A's shown the con-- allel lengths or threads.
- pling device 5 is connected to the source 8 by coaxial conductors the center one of which passes through an electric insulator in the wall of the wave guide.
- the coupling device 9 high frequency oscillating electromagnetic fields are set up in the chamber, which fields are intercepted by the strip l with the generation of heat in the strip.
- At least one dimension of the wave guide and the chamber is selected greater than one half of the wave length oi the generator 3.
- the generator 8 at a frequency of 2900 megacycles, Whose Wave length is 15 centimeters, at least one transverse inside dimension of the wave guide and chamber must be 7.5 centimeters or greater.
- the wave guide may have one transverse dimension of substantially 7.5 centimeters and a length of many times this value.
- the chambar 5, which may be considered also as a wave guide, will probably be larger than the wave guide in a transverse or horizontal direction as shown, although its dimensions in a vertical direction may be less than the length of the wave guide.
- the chamber 5 may be three feet square transversely and one foot high.
- the coupling device 9 may be located one-half wave length from the upper end of the wave guide.
- the slots are positioned a distance from the bottom wall l where rapid and eflicient heating will be obtained, such as approximately one-fourth wave length, i. e. 3.75 centimeters for a 2000 megacycle supply source.
- the strip is supported the chamber on a plate I! made of low loss material as compared with the material being heated, such as glass, secured to the side walls of chamber. If desired, separate sheets of material or other objects may be heated by placing them on "the low loss plate I I.
- Metal plates i2 and B3 are provided at the slot 6 respectively above and below the strip. These plates are secured to the container 5 and serve as a capacitor choke to prevent energy radiation from the chamber.
- the strip i is heated by heat generated in the strip itself by the electromagnetic fields in the chamber 5.
- the strip i may consist of a plurality of par- Latex in strip or cordform may be passed through the chamber and heated therein to vulcanize it.
- Fig. 3 we have shown our invention as applied to the heating of dielectric articles M on a conveyor belt l5 moved continuously by suitable means (not shown) over supporting rollers 16 made of electrically insulating material having a relatively low power factor.
- the belt is also made of a dielectric material having a low power factor such as dry cotton fabric.
- the resonant chamber 5 is open at one side, as shown the bottom side and suitably supported just above the conveyor belt.
- a bottom wall plate l8 for the chamber is provided below the rollers IS, the spacing of the plate l8 from the belt I5 and articles to be heated being such as to provide rapid and efiicient heating preferably a distance of at least substantially one-fourth of the wave length of the supply source.
- the plate I8 is provided with an electric ground connection IQ for safety reasons.
- This form of our invention is adapted for the heating of coffee beans for roasting purposes, the drying of tobacco and ceramic materials, and, in fact, the heating of all dielectric mate ials having a power factor high enough for effective heating by the high frequency used.
- the rubber t re 2% which is to be vulcanized is carried by a forming core 2
- the core and mold sections are preferably made of a dielectric material such as low power factor glass, or other material having a low power factor as compared with rubber so that the generation of heat is confined substantially in the tire. It will be understood that the mold sections are suitably detachabh secured together so that they can be readily separated for the insertion and removal of the tire.
- the mold and tire are placed in a container 24 such as dis closed in Fig. 1 except that the side walls are imperforate and the bottom wall 25 is removable for the insertion and removal of the mold and tire.
- the tire is positioned a distance from the bottom plate 25 such as to provide rapid and efficient heating.
- the source of high frequency supply can be connected directly to the heating cl1amber through which the material to be heated is passed or in which the material is placed, as shown in Fig. 2, without using the wave guide of smaller cross section leading into the heating chamber as shown in Figs. 1, 3 and 4.
- the container 23 made of eletrically conductin material such as copper is provided with slots 21 and 28 in its top and bot-- tom walls respectively through which the material to be heated is passed through the chamber.
- the high frequency supply source (not shown) is connected to the chamber by means of a coaxial line consisting of an outer cylinder 25 having its end electrically connected to the top wall of the container, while its inner conductor 30 extends downward through an aperture in the wall of the container and is electrically connected to the bottom of the container.
- a coaxial line consisting of an outer cylinder 25 having its end electrically connected to the top wall of the container, while its inner conductor 30 extends downward through an aperture in the wall of the container and is electrically connected to the bottom of the container.
- , is at least as great as one-half the wave length of the supply source in order to assure the propagation of the electric waves in the chamber required for efficient heating.
- tuning of the chamber with the supply source will be broad and a resonant condition may not exist.
- High frequency heating apparatus comprising a high frequency oscillation generator for supplying electric power having a predetermined high frequency, walls of electrically conducting material forming a chamber open at the bottom, means connecting said generator to said chamher for producing high frequency electromagnetic fields in said chamber, said chamber having a dimension at least as great as one-half of the wave length of said predetermined high frequency, conveyor means for moving articles to be heated past the open bottom of said chamber, and a plate made of electrically conducting material below said conveyor means forming a bottom wall for said chamber, said plate being a conveyor means for moving articles to be heated past the open bottom of said chamber, a plurality of rollers supporting said conveyor means, and a plate made of electrically conducting material below said rollers forming a bottom wall for said chamber, said bottom wall being spaced from said conveyor a distance equal to substantially one-fourth of the wave length of said high frequency to give rapid and eificient heating.
- High frequency heating apparatus comprising a high frequency oscillation generator for supplying electric power having a predetermined high frequency, walls of electrically conducting material forming a chamber open at one side, means connecting said generator to said chamber for producing electromagnetic fields in said chamber, said chamber having a dimension at least as great as one-half of the wave length of said predetermined high frequency, means for moving a material to be heated along a predetermined path adjacent the open side of said chamber, and a plate made of electrically conducting material on the opposite side of said path.
Description
March 14, 1950 E. C. HANSON ET AL HIGH-FREQUENCY DIELECTRIC HEATING IN A RESONANT CHAMBER Filed June 1, 1946 HIGH FfiEQUE/YC Y SUPPLY SOURCE .lhventors'. Earl cJ-lanson, Donald E.Watts,
by WWW Their Attorney.
Patented Mar. 14, 1950 UNITED STATES PATENT OFFICE HIGH-FREQUENCY DIELECTRIC HEATING IN A RESONANCE CHAMBER Application June 1, 18 i6, Serial No. 673,724
3 Claims. 1
Our invention relates to high frequency electric heating apparatus utilizing a chamber in which oscillating electromagnetic fields are produced, more particularly to apparatus for heating non-metallic or dielectric materials by electromagnetic fields and has for its object a simple, reliable and eflic'ient apparatus for heating 3J1? ticles and for heating material in the form of a continuous thread or strip or articles on a con veyor.
In carrying out our invention in one form we provide a chamber which may be resonant or nonresonant and which has walls made of electrically conducting material, together with means for passing the material to be heated through the chamber. All dielectric materials, both organic and inorganic, may be heated for drying, hardening or other purposes, such as paper, fabrics, rubber, rayon, cellulose or other synthetic materials, food products, tobacco, ceramic materials, etc.
For a more complete understanding of our invention reference should be had to the accompanying drawing, Fig. l. of which "is a view in perspective of high frequency heating apparatus embodying our invention, Fig. 2 is a View in perspective of a simplified form of our invention, Fig. 3 is a View in perspective of a modified form of our invention, while Fig. 4 is a sectional view of a modified form of our invention.
Referring to Fig. 1 of the drawing we have shown our invention in one form as applied to the heating of a strip I of flexible dielectric material, such as damp paper to be dried, which is moved horizontally and continuously at a predetermined speed along a predetermined path through the heating apparatus 2 by suitable feed and winding rolls and driving means (not shown) the strip 1 passing over guide rollers 3 and 4.
The heating apparatus 2 comprises a closed rectangular container 5 formed by walls of electrically conducting material, preferably copper. and provided with a slot 6 in opposite side walls near the bottom wall 1 through which slots the strip i passes through the chamber for heating inside the chamber. Electric power at a suitable high frequency is applied from electric supply means 8, which preferably is an electronic oscil-- lation generator, by a magnetic coupling or hair pin device 9 to a wave guide iii having walls made of an electrically conducting material such as copper bymeans oi graduallytapered walls to the upper wall of the chamber 5. A'sshown the con-- allel lengths or threads.
pling device 5 is connected to the source 8 by coaxial conductors the center one of which passes through an electric insulator in the wall of the wave guide. By means of the coupling device 9 high frequency oscillating electromagnetic fields are set up in the chamber, which fields are intercepted by the strip l with the generation of heat in the strip.
In order to provide for the propagation of electric waves in the chamber and energy oscillation back and forth from electric to magnetic fields at the frequency of the supply source, at least one dimension of the wave guide and the chamber is selected greater than one half of the wave length oi the generator 3. For example, with power supplied by the generator 8 at a frequency of 2900 megacycles, Whose Wave length is 15 centimeters, at least one transverse inside dimension of the wave guide and chamber must be 7.5 centimeters or greater. The wave guide may have one transverse dimension of substantially 7.5 centimeters and a length of many times this value. The chambar 5, which may be considered also as a wave guide, will probably be larger than the wave guide in a transverse or horizontal direction as shown, although its dimensions in a vertical direction may be less than the length of the wave guide. For example, the chamber 5 may be three feet square transversely and one foot high. The coupling device 9 may be located one-half wave length from the upper end of the wave guide.
For effective and efficient heating of the strip l the slots are positioned a distance from the bottom wall l where rapid and eflicient heating will be obtained, such as approximately one-fourth wave length, i. e. 3.75 centimeters for a 2000 megacycle supply source. The strip is supported the chamber on a plate I! made of low loss material as compared with the material being heated, such as glass, secured to the side walls of chamber. If desired, separate sheets of material or other objects may be heated by placing them on "the low loss plate I I.
Metal plates i2 and B3 are provided at the slot 6 respectively above and below the strip. These plates are secured to the container 5 and serve as a capacitor choke to prevent energy radiation from the chamber.
It will be understood that the strip i is heated by heat generated in the strip itself by the electromagnetic fields in the chamber 5.
The strip i may consist of a plurality of par- Latex in strip or cordform may be passed through the chamber and heated therein to vulcanize it.
In Fig. 3 we have shown our invention as applied to the heating of dielectric articles M on a conveyor belt l5 moved continuously by suitable means (not shown) over supporting rollers 16 made of electrically insulating material having a relatively low power factor. The belt is also made of a dielectric material having a low power factor such as dry cotton fabric.
In this application of our invention the resonant chamber 5 is open at one side, as shown the bottom side and suitably supported just above the conveyor belt. A bottom wall plate l8 for the chamber is provided below the rollers IS, the spacing of the plate l8 from the belt I5 and articles to be heated being such as to provide rapid and efiicient heating preferably a distance of at least substantially one-fourth of the wave length of the supply source. As shown, the plate I8 is provided with an electric ground connection IQ for safety reasons. This form of our invention is adapted for the heating of coffee beans for roasting purposes, the drying of tobacco and ceramic materials, and, in fact, the heating of all dielectric mate ials having a power factor high enough for effective heating by the high frequency used.
In the modified form of our invention shown in Fig. 4, we have shown our invention as anplied to the vulcanization of rubber, esp cially automobi e tires. The rubber t re 2% which is to be vulcanized is carried by a forming core 2| and enclosed between the annular mold sections 22 and 23. The core and mold sections are preferably made of a dielectric material such as low power factor glass, or other material having a low power factor as compared with rubber so that the generation of heat is confined substantially in the tire. It will be understood that the mold sections are suitably detachabh secured together so that they can be readily separated for the insertion and removal of the tire. For the generation of heat in the tire the mold and tire are placed in a container 24 such as dis closed in Fig. 1 except that the side walls are imperforate and the bottom wall 25 is removable for the insertion and removal of the mold and tire. The tire is positioned a distance from the bottom plate 25 such as to provide rapid and efficient heating.
If desired, the source of high frequency supply can be connected directly to the heating cl1amber through which the material to be heated is passed or in which the material is placed, as shown in Fig. 2, without using the wave guide of smaller cross section leading into the heating chamber as shown in Figs. 1, 3 and 4. As shown in Fig. 2, the container 23 made of eletrically conductin material such as copper is provided with slots 21 and 28 in its top and bot-- tom walls respectively through which the material to be heated is passed through the chamber.
The high frequency supply source (not shown) is connected to the chamber by means of a coaxial line consisting of an outer cylinder 25 having its end electrically connected to the top wall of the container, while its inner conductor 30 extends downward through an aperture in the wall of the container and is electrically connected to the bottom of the container. One in side dimension of the container, as shown the side 3|, is at least as great as one-half the wave length of the supply source in order to assure the propagation of the electric waves in the chamber required for efficient heating.
Obviously, when the heating chamber is filled with material, tuning of the chamber with the supply source will be broad and a resonant condition may not exist.
While we have shown a particular embodiment of our invention, it will be understood, of course, that we do not wishto be limited thereto since many modifications may be made and we therefore contemplate by the appended claims to cover any such modifications as fall within the true spirit and scope of our invention.
What We claim as new and desire to secure by Letters Patent of the United States, is:
1. High frequency heating apparatus comprising a high frequency oscillation generator for supplying electric power having a predetermined high frequency, walls of electrically conducting material forming a chamber open at the bottom, means connecting said generator to said chamher for producing high frequency electromagnetic fields in said chamber, said chamber having a dimension at least as great as one-half of the wave length of said predetermined high frequency, conveyor means for moving articles to be heated past the open bottom of said chamber, and a plate made of electrically conducting material below said conveyor means forming a bottom wall for said chamber, said plate being a conveyor means for moving articles to be heated past the open bottom of said chamber, a plurality of rollers supporting said conveyor means, and a plate made of electrically conducting material below said rollers forming a bottom wall for said chamber, said bottom wall being spaced from said conveyor a distance equal to substantially one-fourth of the wave length of said high frequency to give rapid and eificient heating.
3. High frequency heating apparatus comprising a high frequency oscillation generator for supplying electric power having a predetermined high frequency, walls of electrically conducting material forming a chamber open at one side, means connecting said generator to said chamber for producing electromagnetic fields in said chamber, said chamber having a dimension at least as great as one-half of the wave length of said predetermined high frequency, means for moving a material to be heated along a predetermined path adjacent the open side of said chamber, and a plate made of electrically conducting material on the opposite side of said path.
from said chamber forming a wall for the open side of said chamber, said plate being spaced from said path a distance of at least substantially on fourth of the wave length of said high frequency.
EARL C. HANSON. DONALD E. WATTS.
(References on following page) REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date Darrah May 26, 1936 Stephen Feb. 11, 1941 King Feb. 18, 1941 Mouromtseff Oct. 14, 1941 Hull Feb. 15, 1944 Hansell Dec. 5, 1944 6 Number Name Date 2,370,161 Hansen Feb. 27, 1945 2,400,777 Okress May 21, 1946 2,433,067 Russell Dec. 23, 1947 OTHER REFERENCES
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US673724A US2500752A (en) | 1946-06-01 | 1946-06-01 | High-frequency dielectric heating in a resonant chamber |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US673724A US2500752A (en) | 1946-06-01 | 1946-06-01 | High-frequency dielectric heating in a resonant chamber |
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US2500752A true US2500752A (en) | 1950-03-14 |
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US673724A Expired - Lifetime US2500752A (en) | 1946-06-01 | 1946-06-01 | High-frequency dielectric heating in a resonant chamber |
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Cited By (47)
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US2583338A (en) * | 1948-09-15 | 1952-01-22 | Gen Electric | Ultrahigh-frequency heater |
US2585970A (en) * | 1949-06-10 | 1952-02-19 | Us Agriculture | Method and apparatus for heating fluids |
US2586754A (en) * | 1946-11-16 | 1952-02-19 | Raytheon Mfg Co | Radio-frequency system |
US2595748A (en) * | 1947-03-14 | 1952-05-06 | Raytheon Mfg Co | Heating apparatus |
US2597825A (en) * | 1948-07-20 | 1952-05-20 | Hotpoint Inc | Combination electric and ultrahighfrequency heating apparatus |
US2599033A (en) * | 1946-11-15 | 1952-06-03 | Raytheon Mfg Co | High-frequency apparatus |
US2602134A (en) * | 1947-10-03 | 1952-07-01 | Gen Electric | High-frequency dielectric heater |
US2603741A (en) * | 1946-12-12 | 1952-07-15 | Goodrich Co B F | High-frequency heating |
US2605383A (en) * | 1945-10-08 | 1952-07-29 | Raytheon Mfg Co | Means for treating foodstuffs |
US2612596A (en) * | 1947-02-18 | 1952-09-30 | Raytheon Mfg Co | Microwave heating |
US2622187A (en) * | 1947-01-14 | 1952-12-16 | Raytheon Mfg Co | Microwave pressure cooker |
US2627571A (en) * | 1948-11-02 | 1953-02-03 | Gen Electric | Choke joint high-frequency heater |
US2632838A (en) * | 1948-03-04 | 1953-03-24 | Gen Electric | Ultrahigh-frequency electromag-netic radiation heating method and apparatus |
US2640142A (en) * | 1946-10-04 | 1953-05-26 | Westinghouse Electric Corp | Microwave heating |
US2648760A (en) * | 1950-09-21 | 1953-08-11 | Raytheon Mfg Co | Heating apparatus |
US2650291A (en) * | 1946-10-04 | 1953-08-25 | Westinghouse Electric Corp | Microwave heating |
US2714070A (en) * | 1950-04-04 | 1955-07-26 | Raytheon Mfg Co | Microwave heating apparatus and method of heating a food package |
US2713697A (en) * | 1949-07-27 | 1955-07-26 | Gen Electric | Molding machine |
US2718580A (en) * | 1951-08-22 | 1955-09-20 | Frederick Shirley | Method and apparatus for electrically heating dielectrics |
US2731537A (en) * | 1950-10-28 | 1956-01-17 | Firestone Tire & Rubber Co | Moisture trap for electronic curing assembly |
US2738406A (en) * | 1951-09-20 | 1956-03-13 | Gen Precision Lab Inc | Radio frequency vulcanizing |
US2739351A (en) * | 1952-02-08 | 1956-03-27 | Western Electric Co | Methods of curing vulcanizable compounds |
US2739599A (en) * | 1948-12-31 | 1956-03-27 | American Mach & Foundry | Method of treating tobacco and tobacco products |
US2744990A (en) * | 1951-01-24 | 1956-05-08 | Gen Electric | Ultrahigh frequency heating apparatus |
US2758603A (en) * | 1950-10-24 | 1956-08-14 | Heljo Runar Rafael | Process and apparatus for curing tobacco |
US2766467A (en) * | 1953-06-25 | 1956-10-16 | United Shoe Machinery Corp | Apparatus for dielectric heat seam bonding |
US2783344A (en) * | 1954-03-26 | 1957-02-26 | Nat Cylinder Gas Co | Dielectric heating systems and applicators |
US2814708A (en) * | 1952-01-05 | 1957-11-26 | Raytheon Mfg Co | Microwave ovens |
US2820127A (en) * | 1953-03-30 | 1958-01-14 | Raytheon Mfg Co | Microwave cookers |
US2827537A (en) * | 1953-11-12 | 1958-03-18 | Raytheon Mfg Co | Electronic heating apparatus |
US3048686A (en) * | 1958-10-16 | 1962-08-07 | Philips Corp | Tunnel furnace with very high frequencies to heat substances, for example, foodstuffs |
US3102181A (en) * | 1959-05-01 | 1963-08-27 | Philips Corp | High-frequency heating furnaces operating with very high frequencies |
US3476904A (en) * | 1968-02-08 | 1969-11-04 | Gen Motors Corp | Conveyor roller member assembly |
US3545093A (en) * | 1968-12-23 | 1970-12-08 | Exxon Research Engineering Co | Microwave vibrating resonating cavity and drying process |
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WO1980002220A1 (en) * | 1979-04-09 | 1980-10-16 | D Brandon | An apparatus and method for thawing materials stored in gondola-type containers |
US4370534A (en) * | 1979-04-09 | 1983-01-25 | Deryck Brandon | Apparatus and method for heating, thawing and/or demoisturizing materials and/or objects |
US4940865A (en) * | 1988-10-25 | 1990-07-10 | The United States Of America As Represented By The Department Of Energy | Microwave heating apparatus and method |
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US10966293B2 (en) | 2017-04-17 | 2021-03-30 | 915 Labs, LLC | Microwave-assisted sterilization and pasteurization system using synergistic packaging, carrier and launcher configurations |
US11032879B2 (en) | 2017-03-15 | 2021-06-08 | 915 Labs, Inc. | Energy control elements for improved microwave heating of packaged articles |
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US2605383A (en) * | 1945-10-08 | 1952-07-29 | Raytheon Mfg Co | Means for treating foodstuffs |
US2650291A (en) * | 1946-10-04 | 1953-08-25 | Westinghouse Electric Corp | Microwave heating |
US2640142A (en) * | 1946-10-04 | 1953-05-26 | Westinghouse Electric Corp | Microwave heating |
US2599033A (en) * | 1946-11-15 | 1952-06-03 | Raytheon Mfg Co | High-frequency apparatus |
US2586754A (en) * | 1946-11-16 | 1952-02-19 | Raytheon Mfg Co | Radio-frequency system |
US2603741A (en) * | 1946-12-12 | 1952-07-15 | Goodrich Co B F | High-frequency heating |
US2622187A (en) * | 1947-01-14 | 1952-12-16 | Raytheon Mfg Co | Microwave pressure cooker |
US2612596A (en) * | 1947-02-18 | 1952-09-30 | Raytheon Mfg Co | Microwave heating |
US2595748A (en) * | 1947-03-14 | 1952-05-06 | Raytheon Mfg Co | Heating apparatus |
US2602134A (en) * | 1947-10-03 | 1952-07-01 | Gen Electric | High-frequency dielectric heater |
US2632838A (en) * | 1948-03-04 | 1953-03-24 | Gen Electric | Ultrahigh-frequency electromag-netic radiation heating method and apparatus |
US2597825A (en) * | 1948-07-20 | 1952-05-20 | Hotpoint Inc | Combination electric and ultrahighfrequency heating apparatus |
US2583338A (en) * | 1948-09-15 | 1952-01-22 | Gen Electric | Ultrahigh-frequency heater |
US2627571A (en) * | 1948-11-02 | 1953-02-03 | Gen Electric | Choke joint high-frequency heater |
US2739599A (en) * | 1948-12-31 | 1956-03-27 | American Mach & Foundry | Method of treating tobacco and tobacco products |
US2585970A (en) * | 1949-06-10 | 1952-02-19 | Us Agriculture | Method and apparatus for heating fluids |
US2713697A (en) * | 1949-07-27 | 1955-07-26 | Gen Electric | Molding machine |
US2714070A (en) * | 1950-04-04 | 1955-07-26 | Raytheon Mfg Co | Microwave heating apparatus and method of heating a food package |
US2648760A (en) * | 1950-09-21 | 1953-08-11 | Raytheon Mfg Co | Heating apparatus |
US2758603A (en) * | 1950-10-24 | 1956-08-14 | Heljo Runar Rafael | Process and apparatus for curing tobacco |
US2731537A (en) * | 1950-10-28 | 1956-01-17 | Firestone Tire & Rubber Co | Moisture trap for electronic curing assembly |
US2744990A (en) * | 1951-01-24 | 1956-05-08 | Gen Electric | Ultrahigh frequency heating apparatus |
US2718580A (en) * | 1951-08-22 | 1955-09-20 | Frederick Shirley | Method and apparatus for electrically heating dielectrics |
US2738406A (en) * | 1951-09-20 | 1956-03-13 | Gen Precision Lab Inc | Radio frequency vulcanizing |
US2814708A (en) * | 1952-01-05 | 1957-11-26 | Raytheon Mfg Co | Microwave ovens |
US2739351A (en) * | 1952-02-08 | 1956-03-27 | Western Electric Co | Methods of curing vulcanizable compounds |
US2820127A (en) * | 1953-03-30 | 1958-01-14 | Raytheon Mfg Co | Microwave cookers |
US2766467A (en) * | 1953-06-25 | 1956-10-16 | United Shoe Machinery Corp | Apparatus for dielectric heat seam bonding |
US2827537A (en) * | 1953-11-12 | 1958-03-18 | Raytheon Mfg Co | Electronic heating apparatus |
US2783344A (en) * | 1954-03-26 | 1957-02-26 | Nat Cylinder Gas Co | Dielectric heating systems and applicators |
US3048686A (en) * | 1958-10-16 | 1962-08-07 | Philips Corp | Tunnel furnace with very high frequencies to heat substances, for example, foodstuffs |
US3102181A (en) * | 1959-05-01 | 1963-08-27 | Philips Corp | High-frequency heating furnaces operating with very high frequencies |
US3476904A (en) * | 1968-02-08 | 1969-11-04 | Gen Motors Corp | Conveyor roller member assembly |
US3545093A (en) * | 1968-12-23 | 1970-12-08 | Exxon Research Engineering Co | Microwave vibrating resonating cavity and drying process |
JPS4822799B1 (en) * | 1970-08-06 | 1973-07-09 | ||
WO1980002220A1 (en) * | 1979-04-09 | 1980-10-16 | D Brandon | An apparatus and method for thawing materials stored in gondola-type containers |
US4256944A (en) * | 1979-04-09 | 1981-03-17 | Deryck Brandon | Apparatus and method for thawing materials stored in gondola-type containers |
US4370534A (en) * | 1979-04-09 | 1983-01-25 | Deryck Brandon | Apparatus and method for heating, thawing and/or demoisturizing materials and/or objects |
US4940865A (en) * | 1988-10-25 | 1990-07-10 | The United States Of America As Represented By The Department Of Energy | Microwave heating apparatus and method |
US5514853A (en) * | 1992-06-29 | 1996-05-07 | Nestec S.A. | Microwave tunnel heating apparatus |
US5423260A (en) * | 1993-09-22 | 1995-06-13 | Rockwell International Corporation | Device for heating a printed web for a printing press |
US5828040A (en) * | 1995-05-31 | 1998-10-27 | The Rubbright Group, Inc. | Rectangular microwave heating applicator with hybrid modes |
US6153868A (en) * | 1996-01-19 | 2000-11-28 | Groupe Danone | Microwave application device, particularly for baking products on a metal carrier |
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