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Publication numberUS2495415 A
Publication typeGrant
Publication dateJan 24, 1950
Filing dateOct 17, 1945
Priority dateOct 17, 1945
Publication numberUS 2495415 A, US 2495415A, US-A-2495415, US2495415 A, US2495415A
InventorsLaurence K Marshall
Original AssigneeRaytheon Mfg Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
High-frequency electromagnetic cooking apparatus
US 2495415 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Jan. 24, 1950 K. MARSHALL HIGH-FREQUENCY ELECTROMAGNETIC vCOOIKING APPARATUS Filed Oct. 1'7, 1945 Patented Jan. 24, 1950 HIGH-FREQUENCY ELECTROMAGNETIC COOKING APPARATUS v Laurence K. Marshall, Cambridge, Mass., as-

signor to Raytheon Manufacturing Company, Newton, Mass., a corporation of Delaware Application October 17, 1945, Serial No. 622,735

My present invention relates to the art of cool;- ing, and more particularly to the art of cooking by means of electromagnetic energy.

While not limited thereto, my present invention is especially suitable for carrying out the cooking necessary in the canning of foodstuffs, such as fruits, vegetables, etc.

One of the objects of my present invention is to provide simple and inexpensive apparatus for performing the above-mentioned cooking by means of electromagnetic energy.

Another object of my present invention is to provide apparatus which enables the above-mentioned cooking to be more speedily and more efciently carried out than has heretofore been the case.

These, and other objects of my present invention, which Will become more apparent as the detailed description thereof progresses, are attained, briefly, in the following manner:

Instead of packing the foodstuff in a conven-A tional, all-metal can, I provide a special container, which is, at least in part, permeable to electromagnetic energy. For example, While the container may have a conventional, cylindrical body portion made of metal, the end members thereof may be made of a dielectric material, such as a suitable plastic. Or, if desired, the entire container may be made of such a plastic, the idea being that the container be so constructed as to permit high-frequency energy to pass through the same to cook the foodstui contained therein.

A plurality of such containers is successively fed through a Wave guide which is excited from any desired source of high-frequency energy, for example, from a magnetron oscillator. It is preferred that the containers move through the wave guide in the same direction as the direction of propagation of the high-frequency energy.

In the accompanying specification I shall describe, and in the annexed drawing show, two illustrative embodiments of the cooking apparatus of my present invention. It is, however, to be clearly understood that I do not Wish to be limited to the details herein shown and described for purposes of illustration only, inasmuch as changes therein may be made Without the exercise of invention, and Within the true spirit and scope of the claims hereto appended.

In said drawing,

Fig. i is a schematic arrangement of apparatus constituting one of the aforesaid illustrative embodiments of my present invention; and

Fig. 2 is a schematic arrangement of apparatus 2 Claims. (Cl. 219-47 constituting the second of the aforesaid illustrative embodiments of my present invention.

Referring now more in detail to the aforesaid illustrative embodiments of my present inven- I tion, with particular reference to the form thereof shown in Fig. 1 of the drawing, the numeral I l designates a hollow, cylindrical Wave guide made of conductive material, said Wave guide, preferably, being horizontally disposed. Adjacent one end thereof, said wave guide is cut away, as at Il, and connected With a verticallydisposed, container-feeding member I2 in which the containers I3 of the foodstuff being canned may be stacked as shown. Diametrically opposite the cutaway portion I I, the Wave guide may be slotted, as at I4, to receive a cam member I5, the latter being reciprocable by any appropriate mechanism (not shown) to periodically move the lowermost container down the Wave guide and permit the next container to drop into said Wave guide through the action of gravity. High-frequency energy may be fed to the wave guide from any desired source I 6, for example, from a magnetron oscillator.

In the form of my present invention under consideration, the containers may each comprise a conventional, cylindrical body portion Il made of metal, closed at the ends thereof by disks I8 made of a suitable dielectric material. As the energy from the source I6 is propagated down the Wave guide, the dielectric end members I8 of the containers permit said energy to enter said containers to cook the foodstuff contained therein.

In the form of my present invention shown in Fig. 2 of the drawing, the numeral I9 designates a horizontally-disposed Wave guide, which is fed from a source 2D of high-frequency energy through a vertical branch 2|. In this case, the containers 22 are, preferably, made entirely of dielectric material. Adjacent one end of the wave guide, there may. for example, be a conveyor system 23 for bringing the containers successively into alignment with the Wave guide opening to enable a reciprocable member 24 to move said container into and through said Wave guide.

This completes the description of the aforesaid illustrative embodiments of my present invention. It will be noted from all of the foregoing that the apparatus employed is simple and inexpensive, and enables the speedy and efficient carrying out of the cooking necessary in the canning of foodstuffs, such as fruits, vegetables, etc.

Other objects and advantages of my present invention will readily occur to those skilled in the art to which the same relates.

What is claimed is:

l. Apparatus for cooking foodstuff comprising: a source of high-frequency electromagnetic energy; a hollow wave guide, excited by said energy, for propagating the same through a confined region of space; and a container, at least a portion of which is permeable to said energy, receptive of said foodstuff; said container being movable through said wave guide, whereby said foodstuff is subjected to the heating effect of said energy,

2. Apparatus for cookingfoodstui comprising: a source of high-frequency electromagnetic energy; a hollow wave guide, excited by said energy, for propagating the same through a conned region of space; a container, at least a portion of which is permeable to said energy, receptive of said foodstuff; and means for feeding said container through said wave guide in a direction parallel to the direction of propagation of said energy, whereby said foodstuff is subjected to the heating effect of said energy.

LAURENCE K. MARSHALL.

4 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS OTHER REFERENCES @Modern Packaging, vol. 17, February 1944, page 99.

Popular Mechanics, January 1945, page 4l of text.

Patent Citations
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US1972050 *Aug 8, 1932Aug 28, 1934Jesse H DavisHigh frequency method of and apparatus for exterminating insect life in seed or grain or other materials
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2545106 *Apr 30, 1948Mar 13, 1951Rca CorpApplicator for radio-frequency heating
US2560903 *Aug 27, 1949Jul 17, 1951Raytheon Mfg CoWave guide dielectric heating apparatus
US2582806 *Jan 23, 1948Jan 15, 1952American Enka CorpDrying of hollow yarn bodies
US2595748 *Mar 14, 1947May 6, 1952Raytheon Mfg CoHeating apparatus
US2603741 *Dec 12, 1946Jul 15, 1952Goodrich Co B FHigh-frequency heating
US2612596 *Feb 18, 1947Sep 30, 1952Raytheon Mfg CoMicrowave heating
US2618735 *Jan 11, 1947Nov 18, 1952Raytheon Mfg CoHeating apparatus
US2622187 *Jan 14, 1947Dec 16, 1952Raytheon Mfg CoMicrowave pressure cooker
US2632838 *Mar 4, 1948Mar 24, 1953Gen ElectricUltrahigh-frequency electromag-netic radiation heating method and apparatus
US2648760 *Sep 21, 1950Aug 11, 1953Raytheon Mfg CoHeating apparatus
US2713697 *Jul 27, 1949Jul 26, 1955Gen ElectricMolding machine
US2714070 *Apr 4, 1950Jul 26, 1955Raytheon Mfg CoMicrowave heating apparatus and method of heating a food package
US2716221 *Sep 25, 1950Aug 23, 1955Allen Philip JRotatable dielectric slab phase-shifter for waveguide
US2733650 *Mar 20, 1953Feb 7, 1956 Microwave cooker controls
US2758282 *Mar 28, 1952Aug 7, 1956Gen Precision Lab IncTransforming microwave energy from rectangular air filled wave guide
US2807698 *Sep 14, 1954Sep 24, 1957A W BrickmanThermatronic processing and containercell combination
US2856497 *Apr 29, 1954Oct 14, 1958Raytheon Mfg CoDielectric matching devices
US5290583 *Apr 2, 1992Mar 1, 1994David ReznikMethod of electroheating liquid egg and product thereof
US5415882 *Jan 22, 1993May 16, 1995Knipper; Aloysius J.Producing extended refrigerated shelf life food without high temperature heating
US5533441 *Mar 8, 1995Jul 9, 1996Reznik; DavidApparatus for rapidly cooling liquid egg
US5562024 *Jun 6, 1995Oct 8, 1996Polny, Jr.; Thaddeus J.Apparatus for electroheating food employing concentric electrodes
US5571550 *Jun 3, 1993Nov 5, 1996Polny, Jr.; Thaddeus J.Methods for electroheating food employing concentric electrodes
US5583960 *Jun 1, 1994Dec 10, 1996David ReznikElectroheating apparatus and methods
US5607613 *Jun 6, 1995Mar 4, 1997Reznik; DavidElectroheating of food products using low frequency current
US5609900 *Mar 21, 1996Mar 11, 1997Reznik; DavidElectroheating of food products using low frequency current
US5630360 *Mar 18, 1996May 20, 1997Polny, Jr.; Thaddeus J.Apparatus for electroheating food employing concentric electrodes
US5636317 *May 30, 1995Jun 3, 1997Reznik; DavidElectroheating apparatus and methods
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US5768472 *Jun 2, 1995Jun 16, 1998Reznik; DavidApparatus and methods for rapid electroheating and cooling
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US20110024411 *Dec 24, 2008Feb 3, 2011Osci-Tek LimitedCombined heater and conveyor
WO2009083725A2 *Dec 24, 2008Jul 9, 2009Richard HollidayCombined heater and conveyor
WO2009083725A3 *Dec 24, 2008Oct 29, 2009Richard HollidayCombined heater and conveyor
Classifications
U.S. Classification219/698, 333/22.00R, 220/573.1, 99/358, 219/693
International ClassificationH05B6/80
Cooperative ClassificationH05B6/782
European ClassificationH05B6/78F