US3584177A - Energy seal for microwave oven apparatus - Google Patents

Energy seal for microwave oven apparatus Download PDF

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Publication number
US3584177A
US3584177A US869106A US3584177DA US3584177A US 3584177 A US3584177 A US 3584177A US 869106 A US869106 A US 869106A US 3584177D A US3584177D A US 3584177DA US 3584177 A US3584177 A US 3584177A
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US
United States
Prior art keywords
enclosure
opening
choke
conductive
energy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US869106A
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English (en)
Inventor
Arnold M Bucksbaum
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.)
Goodman Co LP
Original Assignee
Amana Refrigeration Inc
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Filing date
Publication date
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Publication of US3584177A publication Critical patent/US3584177A/en
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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
    • H05B6/763—Microwave radiation seals for doors

Definitions

  • An oven apparatus is disclosed utilizing electromagnetic energy at microwave frequencies for heating by radiation within an electrically conductive enclosure having an access opening closed by a substantially flush-mounted door arrangement.
  • an energy seal is provided along the peripheral walls of the opening comprising a short-circuited one-quarter wavelength-type choke structure.
  • Such a structure is provided with a layer of conductive material adjacent to the wall surfaces to form substantially a double wall and supporting the high leakage currents as a result of the escaping radiated energy to thereby enhance the efficiency of the choke under all operating conditions.
  • An improved prior art electromagnetic energy seal provides for planar contact closure areas between the access opening and peripheral walls of approximately one-quarter of a wavelength in a single overlapping door arranged similar to a radio frequency transmission choke structure.
  • Still another suggested solution includes a choke-type energy seal having an approximate overall length of one-half wavelength and nonmetallic contact areas for a slidably mounted door.
  • a predetermined escape route is provided for stray radiated energy by the spaced wall surfaces which may be filled with an energy permeable dielectric medium to reduce the choke dimensions over structures in air and to enhance cleanliness.
  • the'energy seal defines a choke structure analogous to conventional parallel plate radio frequency transmission line circuits to provide, a path of least resistance for the escaping energy.
  • a gap oriented near the frontal planar surface of the oven provides a first path of substantially onequarter of a wavelength before the radiated energy contacts a metallic conductive surface.
  • the energy is then reflected or transformed along a second path of one-quarter wavelength terminating in a'conductive surface thereby located an overall distance of an integral number of one-half wavelengths from the point of origin of the escaping energy.
  • the terminating conductive surface therefore, presents a low impedance or short circuit with high surface currents.
  • This low impedance is transformed back one-quarter wavelength as a high impedance and high voltage node with little or no currents present. In turn, this high impedance is reflected back into a short circuit at the point of origin.
  • the prior art electromagnetic energy seals particularly those of the radio frequency choke type, require the use of costly highly electrical conductive metallic components for the doors and wall surfaces ofthe access opening to support the high surface currents at the termining conductive surface.
  • costly metallurgical bonding techniques such as spot welding, are required in the fabrication of the pertinent structures.
  • the efficiency of the foregoing choke arrangements which are critically dependent on dimensions for surface current carrying capabilities may be sharply diminished or altered.
  • the terminating conductive surface may reflect in reality, a high impedance to the point of origin of the choke adjacent tothe oven enclosure. High electromagnetic energy radiation leakage would,
  • microwaves shall refer to electromagnetic wave energy radiation in that portion of the spectrum from approximately 1,000 to 300,000 megacycles per second, corresponding to wavelengths of from 30 centimeters to l millimeter.
  • the oven apparatus disclosed in the present invention utilizes a magnetron as an energy source which radiates at a frequency of substantially 2,450 megacycles per second corresponding to a wavelength of approximately 5 inches in air.
  • the expression wave lengths shall be utilized to refer to the wavelength of the electromagnetic energy as it travels in the medium defined by the choke arrangement at the operating frequency of the magnetron generator. Additionally, the term shall denote the effective wavelength within the choke structure filled with a dielectric medium which will result in shorter tion only in free space.
  • a microwave oven apparatus is provided with a primary energy seal arrangement having two parallel paths terminating in a conducting surface which are microwave permeable and define an overall leakage path of approximately an integral number of one-half wavelength from a point of origin.
  • the high electrical surface current carrying wall structure along the internal perimeter of the choke arrangement is engaged by a layer of a conductive material such as a thin metallic foil.
  • the conductivity of the choke wall structure is thereby rendered less critical in view of the fact that the high surface currents will now be carried by the conductive layer material.
  • the conductive layer may be wedged or supported by the dielectric material.
  • the conductively lined choke arrangement may be disposed along the peripheral edges of the oven door to provide for mounting entirely within the access opening.
  • the choke arrangement structure disclosed herein may be provided as a component of the oven enclosure walls adjacent to the access opening.
  • metallic materials for the door as well as choke arrangement may now employ mechanical rather than metallurgical bonding techniques with an accompanying savings in labor and material costs.
  • materials having poorer electrical conductivity characteristics which render them unsuitable for electrical resistance welding techniques may be employed for the oven door closure means. It is, therefore, within the purview of the invention to substitute less costly metals such as aluminum for such metals as stainless steel with attendant savings in overall apparatus costs.
  • the conductive material layer will also enhance the efficiency of the safety structure of the overall device over extended periods of operation.
  • FIG. 1 is a front perspective view of a microwave oven
  • FIG. 2 is a similar perspective view of the embodiment of the invention with the door closure means opened;
  • FIG. 3 is a top view with a portion of the oven walls removed to reveal internal structure
  • FIG. 4 is an enlarged fragmentary cross-sectional view of a prior art dielectric filled choke arrangement provided in the door closure means of an illustrative embodiment
  • FIG. 5 is a diagrammatic sketch illustrative of the operating principles of the choke structure arrangement of the present invention.
  • FIG. 6 is a partial cross-sectional view illustrative of a door choke arrangement incorporating the present invention.
  • FIG. 7 is a partial cross-sectional view of an alternative embodiment of the door-type choke arrangement of the present invention.
  • FIG. 8 is a partial cross-sectional view of another alternative embodiment wherein the choke arrangement is provided in the microwave oven apparatus wall surfaces sur-- rounding the access opening.
  • a casing 16 surrounds the oven enclosure as well as accompanying components and controls.
  • Access to the interior is provided by opening 18 with a metallic door closure means 20 supported by spring actuated arms 22 and hinge 24 together with a handle 26 to enable manual opening and closing thereof.
  • the door 20 comprises a panel member 28 as well as ring member 30 secured along the perimeter of the panel member.
  • the door assembly is positioned within the access opening 18 and is flush mounted with respect to the oven walls.
  • Decorative trim members 32 are disposed along the periphery of the door panel and ring members in the manner of a picture frame and expose perforations 34 defining approximately 150 openings per square inch covering a major portion of the door panel member to prevent the escape of electromagnetic energy radiation during the operation of the oven apparatus with the door closing the access opening.
  • Control panel 36 is disposed adjacent to the oven enclosure opening with the electromagnetic energy generation means and accompanying electrical circuitry disposed behind.
  • electromagnetic generation means illustratively a microwave magnetron, along with the requisite power supply and controls indicated generally by box 38, feed the-required energy by means of a radiating probe 40 in dielectric dome member 42 to a section of rectangular waveguide 44 having an appropriately dimensioned open end 46 within the cavity enclosure 12.
  • the opposing end of waveguide 44 is closed as at 48 to prevent escapement of electromagnetic energy in this direction.
  • the waves radiating within the oven enclosure are uniformly distributed by a stirrer 50 having a plurality of vane members 52 which are driven by a fractional horsepower motor.
  • the stirrer means are well known in the art and have been described in detail in U.S. Pat. No. 2,813,185, issued Nov. 12, [957 to Robert V. Smith.
  • the door panel 28 defines a peripheral upstanding wall section 284 which defines with the oven enclosure wall 14a first electromagnetic energy transmission path 56 having its point of origin at point 58 adjacent wall 14.
  • the ring member 30 has a stepped configuration to provide a conductive wall 30a for the choke arrangement and define a frontal lateral member 30b overlapping the oven enclosure and easing walls 14 and 16, respectively.
  • the door ring member 30 is electrically welded to the panel 28 to thereby frame perforations 34. in the fabrication of the overall door assembly then, a plurality of spot welds will be provided on four sides of the panel member 28.
  • Ring member 30 defineswith the door panel section 28a a second parallel electromagnetic energy transmission path 60.
  • the entire choke structure may be filled with a dielectric medium which is electromagnetic energy permeable and, preferably, has a dielectric constant value of between 2 and 4. illustratively, polystyrene or polypropylene may be utilized for the dielectric material.
  • the complete choke arrangement comprises what is referred to herein as the primary seal" offering the path of least resistance for the escaping radiated electromagnetic energy around the inside peripheral walls of the access opening 18.
  • additional safety measures may be provided by a secondary seal" along the frontal edge of the oven enclosure and casing walls which will absorb any energy bypassing the choke arrangement.
  • a first energy absorbent member 64 is affixed around the peripheral frontal edge of the walls defining the access opening 18 and a similar absorbent material 66 isdisposed along the peripheral walls of the door ring member ⁇ with the absorbent members 64 and 66 in contiguous relationship upon the closing of the door assembly 20.
  • a dielectric plastic material such as vinylis loaded with a highly energy-absorbent material such as carbon black.
  • the seal materials may be secured by an adhesive material to the metallic walls.
  • the first electromagnetic energy transmission path 56 is defined by walls 14 and 28a.
  • a second electromagnetic energy transmission path 60 substantially parallel to the first path is defined by conductive walls 280, 28, 30 and 30a.
  • a terminating conductive surface wall is thereby provided by the door panel member 28.
  • the dimension from the point designated by the letter A to the midpoint of the opening between walls 280 and 30a designated by the letter B is approximately one-quarter wavelength of the operating frequency. Similarly, a distance of one-quarter wavelength is provided between the point B and the terminating conductive wall surface indicated by the letter C.
  • the total overall choke transmission path thereby provided is approximately equal to an integral number of one-half wavelengths from the point A.
  • an electrical short circuit or low impedance at the point C is reflected as a short circuit at the point A or point of origin 58 of the first transmission path 56.
  • electromagnetic energy escaping from the oven will be prevented from leaking from the edges of the door indicated by point D.
  • the door ring member 30 is secured to the panel member 28, illustratively, a. plurality of spot welds 68 spaced a predetermined distance apart.
  • the leakage electromagnetic energy traversing the one-half wavelength choke will, cause high surface currents in the vicinity of the inner portion of the wall surface 28 at the point C as well as walls 280 and 30.
  • the surface currents within the second transmission path 60 are indicated by the arrows 70 and 72.
  • Such high surface currents in the vicinity of the terminating conductive surface and second transmission path must be considered in the establishment of the distance between the spot welds as well as the selection of conductivity characteristics of the metallic materials for the door ring and panel members.
  • the invention provides for the disposition of a relatively thin layer of conductive material forming substantially a double wall with at least one of the underlying perimeter wall surfaces supporting the high electric surface currents within the second transmission path 60 within the choke arrangement.
  • the high surface currents will thereby be supported by the conductive layer material.
  • the second transmission path of the choke arrangement then, is analogous to a shorted transmission line with essentially a high voltage node and low surface currents at the point B which will be the open end of the conductive material.
  • the addition of the layer material will have no adverse effect on the overall operation of the microwave oven door primary seal.
  • FIGS. 6 to 8 inclusive several embodiments of the invention incorporating'theconductively lined choke arrangement are illustrated.
  • the layer material of any suitable conductive metal having a thickness of approximately 0004-0008 inches or any thickness satisfactory for supporting the high surface currents along the preferred wall surface areas.
  • a metallic foil such as aluminum, gold or silver may be glued on one side for application of the layer material to the metallic wall surfaces.
  • the layer 74 it will be noted, is applied to the surfaces 28a,28, 30 and 30a.
  • the dielectric filler member 62 may then be disposed within the choke in contiguous relation with the conductivefoil layer 74.
  • the invention may be practiced by coating or plating the outer surfaces of the dielectric body 62 with a plating thickness of only a few thousandths of an inch over the preferred wall portions. It will be noted that numerous ways for the application of the conductive layer will occur to those skilled in the art and in configurations of the choke structures disposed in an alternative manner similar to those disclosed in the aforementioned United States patent.
  • the dielectric body member may be also omitted and the free space employed.
  • the conductive layer supports the high electric surface currents, the use ,of the electrical welding techniques may be omitted and mechanical securing means such as rivets 76 may be utilized to secure the door ring member 30 to the door panel 28.
  • the electrical resistance of the door components therefore, will no longer have to be considered with relation to the desired choke electrical parameters to support the electromagnetic leakage energy.
  • FIG. 7 illustrates an alternative embodiment of the invention with the conductive foil layer material 78 disposed on walls 28a, 28 and 30 defining the second transmission path.
  • the conductive foil layer 78 has a substantially U-shaped configuration which may facilitate the assembly and support of this component by the dielectric body member 62.
  • FIG. 8 still another alternative embodiment of the invention is disclosed'with the choke arrangement 80 provided as a part of the oven wall 14 instead of the door assembly.
  • the conductive choke layer 82 is disposed similarly to the orientation in FIG. 6 with the exception that oven walls are now contacted.
  • Mechanical securing means 86 will secure choke ring 14a to oven walls 14.
  • panel member 88 and door ring 90 are made of a single metal sheet. The resultant choke arrangement will thereby be provided around the entire periphery of the oven access opening.
  • said enclosure having an access opening therein;
  • said choke arrangement defining first and second transmission paths each having a distance of substantially onequarter wavelength
  • said enclosure having an access opening therein;
  • said choke arrangement defining a first transmission path substantially one-quarter wavelength in distance from a point of origin adjacent to the peripheral edges of said opening and a second transmission path of, substantially similar distance and terminating in a conductive surface located at a distance approximately equal to an integral number of half wavelengths from said point of origin;
  • said enclosure having an access opening therein;
  • said choke arrangement defining wall structure terminating in a conductive surface located substantially an integral number of one-half wavelengths from a point adjacent to the peripheral edges of said opening;
  • a layer of a conductive material capable of supporting high electric surface currents disposed in engagement with said terminating conductive surface and adjacent wall surfaces to form substantially a double wall within said choke arrangement;
  • Microwave oven apparatus comprising:
  • said enclosure having an access opening therein;
  • said choke arrangement defining first and second parallel transmission paths each having a distance of substantially one-quarter wavelengths
  • Microwave oven apparatus comprising:
  • said enclosure having an access opening therein;
  • said choke arrangement defining wall structure terminating in a conductive surface located substantially an integral number of half wavelengths from a point of origin adjacent to the peripheral edges of said opening;
  • Microwave oven apparatus according to claim wherein' said choke arrangement is disposed along the peripheral edges of said door.
  • Microwave oven apparatus according to claim 5 wherein said choke arrangement is disposed along the peripheral oven walls around said opening;
  • Microwave oven apparatus according to claim 5 wherein said conductive layer covers a substantial portion of the perimeter walls defining said choke arrangement.
  • Microwave oven apparatus wherein said conductive layer is supported within said choke arrangement by a body of a dielectric material.
  • Microwave oven apparatus is filled with a dielectric material with said conductive material coated on the dielectric material in the areas contacting the inner choke wall surfaces.
  • said enclosure having an access opening therein;
  • means defining an electrical choke arrangement disposed adjacent to the peripheral edges of said opening; and a layer of a conductive material capable of supporting high electric surface currents and forming substantially a double wall with at least one underlying inner wall surface of said choke arrangement.
  • said enclosure having an access opening therein;
  • said energy seal comprising an electrical choke structure with a layer of a conductive material contacting at least one inner wall surface of said structure to form substantially a double wall with the underlying wall surface.
  • High frequency heating apparatus adapted to be supplied with electromagnetic wave energy comprising: 7
  • said energy seal comprising conductive walls defining an electrical choke structure and a layer of a conductive material disposed inside said choke structure to form substantially a double wall with at least one of the underlying conductive walls.
  • An energy seal for ovens adapted to be radiated with electromagnetic energy comprising:
  • a layer of a conductive material in said choke structure capable of supporting high leakage currents resulting from escaping radiated energy and forming substantially a double wall with at least one of the underlying wall surfaces.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US869106A 1969-10-24 1969-10-24 Energy seal for microwave oven apparatus Expired - Lifetime US3584177A (en)

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US86910669A 1969-10-24 1969-10-24

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US (1) US3584177A (nl)
BE (1) BE757877A (nl)
CH (1) CH541111A (nl)
DE (2) DE2052105A1 (nl)
DK (1) DK136049B (nl)
FR (1) FR2066254A5 (nl)
GB (1) GB1276238A (nl)
NL (1) NL166837C (nl)
SE (1) SE348278B (nl)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789178A (en) * 1972-10-18 1974-01-29 Sage Laboratories Microwave heating apparatus
US3809843A (en) * 1970-06-01 1974-05-07 Gen Corp Microwave heating apparatus
US3956608A (en) * 1971-10-19 1976-05-11 U.S. Philips Corporation Energy seal for a microwave oven
JPS5179743U (nl) * 1974-12-19 1976-06-24
US4053731A (en) * 1974-06-14 1977-10-11 Amana Refrigeration, Inc. Microwave energy oven seal
US4059742A (en) * 1975-07-09 1977-11-22 Litton Systems, Inc. Microwave seal for combination cooking apparatus
US4102041A (en) * 1977-03-28 1978-07-25 Amana Refrigeration, Inc. Method of making microwave oven seal structure
US4114013A (en) * 1977-07-28 1978-09-12 General Electric Company Choke for combined microwave and self-cleaning oven
US4166207A (en) * 1977-05-31 1979-08-28 Whirlpool Corporation Microwave generating device--door seal
US4191877A (en) * 1977-07-11 1980-03-04 Matsushita Electric Industrial Co., Ltd. Microwave oven equipped with electric heating arrangement
US4371770A (en) * 1980-10-27 1983-02-01 Raytheon Company Adjustable microwave oven door seal
US4449025A (en) * 1980-10-03 1984-05-15 Matsushita Electric Industrial Co., Ltd. Door seal construction for high frequency heating appliance
US4471194A (en) * 1971-05-20 1984-09-11 Matsushita Electric Industrial Co., Ltd. Electromagnetic energy seal for high frequency heating apparatus
US4523069A (en) * 1983-10-24 1985-06-11 General Electric Company Microwave oven door seal
USRE32664E (en) * 1971-11-30 1988-05-10 Raytheon Company Energy seal for high frequency energy apparatus
EP0278564A1 (en) * 1987-02-06 1988-08-17 Philips Norden AB An arrangement in a microwave oven
US4999469A (en) * 1990-04-02 1991-03-12 Raytheon Company Apparatus for microwave heating test coupons
US5498308A (en) * 1994-02-25 1996-03-12 Fusion Systems Corp. Plasma asher with microwave trap
US6263830B1 (en) 1999-04-12 2001-07-24 Matrix Integrated Systems, Inc. Microwave choke for remote plasma generator
WO2003073799A1 (en) * 2002-02-20 2003-09-04 Fusion Uv Systems, Inc. Microwave powered uv lamp with improved rf gasket arrangement
US20070023029A1 (en) * 2005-07-27 2007-02-01 Maytag Corp. Door assembly for a cooking appliance
EP2031937A1 (en) * 2007-09-03 2009-03-04 Electrolux Home Products Corporation N.V. A microwave oven door with a wave chokes system
US20110290230A1 (en) * 2010-05-26 2011-12-01 Lg Electronics Inc. Door choke and cooking apparatus including the same
US9129778B2 (en) 2011-03-18 2015-09-08 Lam Research Corporation Fluid distribution members and/or assemblies
CN108780725A (zh) * 2016-03-25 2018-11-09 东芝北斗电子株式会社 磁控管
CN110521281A (zh) * 2016-11-30 2019-11-29 伊利诺斯工具制品有限公司 用于射频烤箱的射频阻流器和界面结构
US20210352781A1 (en) * 2020-05-11 2021-11-11 Lg Electronics Inc. Oven having multiple chokes
USD1036186S1 (en) 2019-06-06 2024-07-23 Sharkninja Operating, Llc Oven

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE375599B (nl) * 1973-08-17 1975-04-21 Philips Svenska Ab

Citations (4)

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Publication number Priority date Publication date Assignee Title
US2958754A (en) * 1958-12-15 1960-11-01 Gen Electric Electronic ovens
US3182164A (en) * 1962-02-28 1965-05-04 Raytheon Co Electromagnetic energy seal
US3196242A (en) * 1961-10-25 1965-07-20 Philips Corp High-frequency oven door seal
US3210512A (en) * 1962-02-02 1965-10-05 Lyons & Co Ltd J Ovens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958754A (en) * 1958-12-15 1960-11-01 Gen Electric Electronic ovens
US3196242A (en) * 1961-10-25 1965-07-20 Philips Corp High-frequency oven door seal
US3210512A (en) * 1962-02-02 1965-10-05 Lyons & Co Ltd J Ovens
US3182164A (en) * 1962-02-28 1965-05-04 Raytheon Co Electromagnetic energy seal

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809843A (en) * 1970-06-01 1974-05-07 Gen Corp Microwave heating apparatus
US4471194A (en) * 1971-05-20 1984-09-11 Matsushita Electric Industrial Co., Ltd. Electromagnetic energy seal for high frequency heating apparatus
US3956608A (en) * 1971-10-19 1976-05-11 U.S. Philips Corporation Energy seal for a microwave oven
USRE32664E (en) * 1971-11-30 1988-05-10 Raytheon Company Energy seal for high frequency energy apparatus
US3789178A (en) * 1972-10-18 1974-01-29 Sage Laboratories Microwave heating apparatus
US4053731A (en) * 1974-06-14 1977-10-11 Amana Refrigeration, Inc. Microwave energy oven seal
JPS5179743U (nl) * 1974-12-19 1976-06-24
US4059742A (en) * 1975-07-09 1977-11-22 Litton Systems, Inc. Microwave seal for combination cooking apparatus
DE2813312A1 (de) * 1977-03-28 1978-10-05 Amana Refrigeration Inc Verfahren zur herstellung einer resonanzdrossel-mikrowellenfalle und insbesondere nach einem derartigen verfahren hergestellte resonanzdrossel-mikrowellenfalle, vornehmlich fuer mikrowellenoefen
US4102041A (en) * 1977-03-28 1978-07-25 Amana Refrigeration, Inc. Method of making microwave oven seal structure
US4166207A (en) * 1977-05-31 1979-08-28 Whirlpool Corporation Microwave generating device--door seal
US4191877A (en) * 1977-07-11 1980-03-04 Matsushita Electric Industrial Co., Ltd. Microwave oven equipped with electric heating arrangement
US4114013A (en) * 1977-07-28 1978-09-12 General Electric Company Choke for combined microwave and self-cleaning oven
US4449025A (en) * 1980-10-03 1984-05-15 Matsushita Electric Industrial Co., Ltd. Door seal construction for high frequency heating appliance
US4371770A (en) * 1980-10-27 1983-02-01 Raytheon Company Adjustable microwave oven door seal
US4523069A (en) * 1983-10-24 1985-06-11 General Electric Company Microwave oven door seal
EP0278564A1 (en) * 1987-02-06 1988-08-17 Philips Norden AB An arrangement in a microwave oven
US4855554A (en) * 1987-02-06 1989-08-08 U.S. Philips Corporation Arrangement in a microwave oven
US4999469A (en) * 1990-04-02 1991-03-12 Raytheon Company Apparatus for microwave heating test coupons
US5498308A (en) * 1994-02-25 1996-03-12 Fusion Systems Corp. Plasma asher with microwave trap
US6412438B2 (en) 1999-04-12 2002-07-02 Matrix Integrated Systems, Inc. Downstream sapphire elbow joint for remote plasma generator
US6352050B2 (en) 1999-04-12 2002-03-05 Matrix Integrated Systems, Inc. Remote plasma mixer
US6263830B1 (en) 1999-04-12 2001-07-24 Matrix Integrated Systems, Inc. Microwave choke for remote plasma generator
US6439155B1 (en) 1999-04-12 2002-08-27 Matrix Integratea Systems Inc. Remote plasma generator with sliding short tuner
WO2003073799A1 (en) * 2002-02-20 2003-09-04 Fusion Uv Systems, Inc. Microwave powered uv lamp with improved rf gasket arrangement
US6646384B2 (en) * 2002-02-20 2003-11-11 Fusion Uv Systems, Inc. Microwave powered UV lamp with improved RF gasket arrangement
US20070023029A1 (en) * 2005-07-27 2007-02-01 Maytag Corp. Door assembly for a cooking appliance
US8578925B2 (en) * 2005-07-27 2013-11-12 Whirlpool Corporation Oven door assembly incorporating overlay member
CN101796884B (zh) * 2007-09-03 2012-10-03 伊莱克斯家用产品股份有限公司 带有波阻挡系统的微波炉门
WO2009030321A1 (en) * 2007-09-03 2009-03-12 Electrolux Home Products Corporation N.V. A microwave oven door with a wake chokes system
AU2008295181B2 (en) * 2007-09-03 2013-02-28 Electrolux Home Products Corporation N.V. A microwave oven door with a wake chokes system
US8502125B2 (en) 2007-09-03 2013-08-06 Electrolux Home Products Corporation N.V. Microwave oven door with a waves chokes system
EP2031937A1 (en) * 2007-09-03 2009-03-04 Electrolux Home Products Corporation N.V. A microwave oven door with a wave chokes system
US20100308034A1 (en) * 2007-09-03 2010-12-09 Electrolux Home Products Corporation N.V. Microwave oven door with a waves chokes system
US9179506B2 (en) * 2010-05-26 2015-11-03 Lg Electronics Inc. Door choke and cooking apparatus including the same
US20110290230A1 (en) * 2010-05-26 2011-12-01 Lg Electronics Inc. Door choke and cooking apparatus including the same
US9129778B2 (en) 2011-03-18 2015-09-08 Lam Research Corporation Fluid distribution members and/or assemblies
CN108780725A (zh) * 2016-03-25 2018-11-09 东芝北斗电子株式会社 磁控管
US10403467B2 (en) * 2016-03-25 2019-09-03 Toshiba Hokuto Electronics Corporation Magnetron
CN110521281A (zh) * 2016-11-30 2019-11-29 伊利诺斯工具制品有限公司 用于射频烤箱的射频阻流器和界面结构
CN110521281B (zh) * 2016-11-30 2022-06-03 伊利诺斯工具制品有限公司 一种烤箱和用于烤箱的射频阻流器
USD1036186S1 (en) 2019-06-06 2024-07-23 Sharkninja Operating, Llc Oven
USD1046543S1 (en) 2019-06-06 2024-10-15 Sharkninja Operating Llc Oven
US20210352781A1 (en) * 2020-05-11 2021-11-11 Lg Electronics Inc. Oven having multiple chokes

Also Published As

Publication number Publication date
DE2052105A1 (de) 1971-05-13
DE7039215U (de) 1973-04-26
GB1276238A (en) 1972-06-01
DK136049B (da) 1977-08-01
NL166837C (nl) 1981-09-15
NL166837B (nl) 1981-04-15
CH541111A (de) 1973-08-31
BE757877A (fr) 1971-04-01
FR2066254A5 (nl) 1971-08-06
SE348278B (nl) 1972-08-28
DK136049C (nl) 1978-01-02
NL7015564A (nl) 1971-04-27

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