US3322112A - Infrared gas burner - Google Patents

Infrared gas burner Download PDF

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Publication number
US3322112A
US3322112A US447739A US44773965A US3322112A US 3322112 A US3322112 A US 3322112A US 447739 A US447739 A US 447739A US 44773965 A US44773965 A US 44773965A US 3322112 A US3322112 A US 3322112A
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US
United States
Prior art keywords
burner
plate
compartment
upwardly
warpage
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
US447739A
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English (en)
Inventor
Norman M Huff
Marvin A Kruse
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.)
Harper Wyman Co
Original Assignee
Harper Wyman Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Harper Wyman Co filed Critical Harper Wyman Co
Priority to US447739A priority Critical patent/US3322112A/en
Priority to GB14064/66A priority patent/GB1099175A/en
Priority to BE679228D priority patent/BE679228A/xx
Priority to DE19661579671 priority patent/DE1579671A1/de
Application granted granted Critical
Publication of US3322112A publication Critical patent/US3322112A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C99/00—Subject-matter not provided for in other groups of this subclass
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00—Baking; Roasting; Grilling; Frying
    • A47J37/06—Roasters; Grills; Sandwich grills
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/125—Radiant burners heating a wall surface to incandescence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/24—Radiant bodies or panels for radiation heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/08—Arrangement or mounting of burners
    • F24C3/085—Arrangement or mounting of burners on ranges
    • F24C3/087—Arrangement or mounting of burners on ranges in baking ovens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2700/00—Special arrangements for combustion apparatus using fluent fuel
    • F23C2700/04—Combustion apparatus using gaseous fuel
    • F23C2700/046—Combustion apparatus using gaseous fuel generating heat by heating radiant bodies

Definitions

  • the present invention relates to an infrared gas burner and has for its primary object the provision of a new and improved burner of this character that is economical to manufacture and which operates efliciently.
  • An object of the present invention is the provision of an infrared gas burner comprising an elongated burner and imperforate overlying plate providing, when used as a broiler burner, a relatively large broiler area operating at a temperature of between l000 and 1200 F. surface temperature to provide radiation in the far infrared range, i.e., approximately 2.5 to 6.5 microns to insure the greatest degree of heat absorption by the food being broiled.
  • a further object of the present invention is the provision of a burner of the character aforesaid in which the burner temperature is realized with a minimum gas flow rate and with medium primary air to produce a fairly well lengthened and not too hard flame and which will generally operate at full on, but which is also operable at turndown rates and in which cooking or broiling will be regulated by rack positioning of the food.
  • a still further object of the present invention is the provision of a new and improved infrared broiler burner including an elongated tubular horizontally disposed burner above which is located an imperforate plate having a pair of wings inclined upwardly at an angle of about five degrees from the horizontal and in which the burner ports provide a generally laminar gas flow so that the gas flames have what might be described as a scrubbing relationship with the underside of the plate wings in order to insure eificient combustion of the gas Within the limits of acceptable carbon monoxide formation.
  • a further object of the present invention is the construction of a burner as aforesaid in which the plate and burner are so located and arranged so as to provide an etfective laminar flow and scrubbing action of the gas flames.
  • a further object of the present invention is to provide a burner having increased emissivity of radiation provided by porcelain enamel coating of black or dark grey color.
  • a further object of the present invention is to construct an infrared burner which acts efliciently as an energy transformer, radiator and distributor of infrared energy.
  • a further object of the present invention is to provide an infrared burner in which warpage of the burner plate is minimized as by a peripheral upwardly extending flange portion which may be combined with either longitudinal ribs or, particularly, with heightened flange corners adapted to contact the top of the oven, thereby to limit warpage and to provide adequate clearances for circulation of oven combustion products.
  • the infrared gas burner of the present invention includes, in combination, a horizontally disposed elongated tubular burner element having a series of small ports thereof disposed in a substantially horizontal plane and a radiation plate secured to the upper side of the burner element.
  • the radiation :plate has a central arcuate portion encircling approximately the upper ninety degrees of the tubular element and oppositely disposed imperforate side portions or wings extending laterally and upwardly from the side portion at angles of about five degrees from the horizontal and relative to which the ice flames move outwardly with a scrubbing action during operation of the burner.
  • the burner plate has an upwardly extending flange around substantially its entire periphery and in one embodiment the flange has corner portions extending upwardly beyond the remainder of the flange for engagement with associated portions of the range in which the burner is installed for the purpose of minimizing and limiting warpage of the plate.
  • the plate is heated to a temperature of between 1000 and 1200 F. to provide radiation in the far infrared range, i.e., 2.5 to 6.5 microns, to provide optimum heating of the food to be broiled.
  • the burner plate may be coated, as
  • porcelain enamel coating or heat resistant paint of black or dark gray color to increase the radiation emissivity.
  • FIG. 1 is a front view, partly broken away and parts omitted, of a gas range equipped with two burners constructed and arranged in accordance with the present invention, one of the burners, the one at the left, being a high broiler and the one at the right being installed as a conventional combination oven and broiler burner with the burner of the invention disposed below the oven bottom and above the broiler drawer so that it may be used either for broiling or baking purposes;
  • FIG. 2 is a fragmentary cross sectional view taken along the line 2-2 of FIG. 1;
  • FIG. 3 is an enlarged horizontal cross sectional view taken along the line 3-3 of FIG. 1, but with the broiler drawer omitted;
  • FIG. 4 is a fragmentary further enlarged vertical cross sectional view taken along the line 44 of FIG. 3, but showing the broiler drawer;
  • FIG. 5 is an enlarged fragmentary view taken along the line 55 of FIG. 4, but illustrating the front end of the burner;
  • FIG. 6 is a side elevational view of the burner plate alone.
  • FIGS. 7, 8 and 9 are top, side and end plan views of a modified form of burner plate.
  • the burner of the present invention may be used for both conventional combined oven and broil burners and burners used solely for broiling. Both types of burners are installed in the gas range indicated as a Whole by reference character 10 in FIG. 1.
  • a combination oven and broiler burner 12 constructed in accordance with the present invention so that it can be used, in conventional manner, either for broiling or baking purposes.
  • the broiler drawer door has been omitted but the usual oven door 14 above the 'burner has been shown.
  • a second burner 12 constructed and arranged in accordance with the present invention and shown mounted in a compartment 16 having a door 16A, shown only in FIGS. 2 and 3.
  • This second burner is used for broiling only-the arrangement providing what is commonly known as a high broiler.
  • the compartment 16 is provided with a broiler drawer 18, not shown in detail. While not illustrated, an arrangement of two burners may be disposedin a single compartment with a broil burner at the top of the compartment and a bake burner at the bottom. Other possible arrangements may be utilized.
  • the tube is disposed horizontally and it has a series of small ports 20A arranged in thirteen groups 20B of five each.
  • the ports are located centrally of and on opposite sides of the tube so that gas is projected in a generally horizontal direction from the ports.
  • the ports are drilled with a No. 47 drill and are .078 inch in diameter.
  • the front end of the tube is closed by an end cap 20C, see FIG. 5, to which is attached a bracket 20D having secured to it a dependent supporting and locating pin or stud 20E.
  • the latter fits into an apertured supporting bracket 20F, see FIGS. 2 and 3, secured in suitable'manner to the interior of the range.
  • the burner tube 20 is supported at its rear by a support rod 20G adapted to be mounted at the rear of the compartment and secured to coupling flange elements 20H by means of which the rear end of the burner tube is secured to the upper end of an angulated venturi tube 24, see FIG. 2, by means of which gas is supplied to the burner.
  • the lower end of the venturi is supplied with gas through a gas inlet nozzle 25 in known manner.
  • the burner plate 22 has a central arcuate portion 22A overlying the upper ninety degrees of the burner tube 20 with the opposite edges of the arcuate portion disposed about of an inch above the burner ports 20A. It has been found that this distance is quite critical in order to obtain the desired combustion of gas and scrubbing action of the flames at the underside of the plate.
  • the central portion of the plate is attached to the burner tube as by a number of rivets 22B.
  • the burner plate includes oppositely disposed imperforate side portions or wings 22C extending laterally and upwardly from the central portion at an angle of about five degrees from the horizontal. It has been found that this angle is also quite critical in order to make the gas flames angle slightly upwardly toward and along the underside of the imperforate portions to produce a scrubbing action, somewhat as indicated in FIG. 4. If the relationship between the ports and plate and the gas flow is not designed properly, the flames will not burn pro-perly and' there will be excessive production of carbon monoxide and the plate also will not be heated properly.
  • the plate may have a length of fifteen inches. with a width of about fourteen inches. It is spaced substantially from the front and rear of the compartment and but about an inch or less from the side walls 26A of the compartment 16. The spacing at the rear is. particularly important from the standpoint of there resulting no interference with the pilot burner and associated controls, notshown, associated with the ignition of, the burner.
  • a steel plate having a thickness of about .025 to .065 inch has been found to be satisfactory.
  • the plate is provided with a peripheral flange 22D having upwardly projecting rounded corners 22E adapted to engage associated range structure in the event of a predetermined warpage, thereby to prevent undesirable further warpage.
  • This arrangement is illustrated in FIGS. 1, 2 and 4, particularly the latter,
  • a broiler shelfor rack 28 is illustrated as being supported in the broiler drawer 18.
  • the rack is adapted adjustably to receive a pan or the like 30 upon which is placed the meat 32, for example, to be broiled. It will be noted that the radiation which is normal to the wings 22C is quite effectively directed over the entire area of the meat.
  • the burner plate 22 Improved results are obtained by coating the burner plate 22 with a, porcelain enamel or heat resistant paint of black or gray color.
  • the plate could be coated with red enamel or heat resistant paint'to give the impression of visible heat, although the plate should be heated between 1000 and 1200 F., in order to provide radiation in the far infrared range, approximately 2.5 to 65 microns, which provides optimum cooking of the meat.
  • FIGS. 7, 8 and 9 A second embodiment of the burner plate is illustrated in FIGS. 7, 8 and 9.
  • the plate is indicated as a whole by reference character 49. It is substantially the same as the previously described burner except that the peripheral flange portions 40A of uniform height are associated only with the ends of the plate, while longitudinal upwardly extending ribs 40B are provided at opposite edgs of the plate for strengthening the plate and for minimizing possible warpage.
  • the burner may be made simply and inexpensively and can be readily installed in desired position in a domestic gas range.
  • the gas flow is such that the flames rise slightly and have a scrubbing action along the underside of the radiant plate 22, as depicted in FIG. '4.
  • Substantially complete combustion takes place and there is no excessive production of carbon monoxide.
  • the entire area of the plate is quite well heated to a temperature of about 1l0O F. to provide the desired radiation in the far infrared range, which is best for eifecting heat absorption by the food being broiled.
  • the products of combustion rise in the oven or broiler compartment and undue warpage of the burner plate 22 is prevented by engagement of a compartment wall or bottom by one of the corner portions 22E.
  • the burners It has been found preferable to install the burners in symmetrical horizontal position. The vertical location depends somewhat upon flue location and general circulatory behavior of the products of combustion. The best positioning of the burner may actually be determined by try out in a particular compartment design. Generally, it has been found preferable that the burner be mounted as high as possible in the compartment, with due regard being given to meeting combustion restrictions, in order to obtam the greatest degree of space flexibility. If combustion requirements permit, the corners of the plate should be within /s inch of the top of the compartment so that the top wall would 'be engaged by the plate corner upon A1 inch warpage. Also, in order to obtain maximum effective radiation, the plate should be coatedwith porcelain enamel approaching a dull jet black in color.
  • the five degree upward inclination of the plate wings has been found to be quite critical. This angular rise provides for good combustion without the formation of excessive quantities of carbon monoxide.
  • the gaseous flow from the ports is laminar and tends to flow along the underside of the'wings without turbulence and undesired impmgement.
  • the primary air generally needs to be adjusted to a medium rate to provide adequate temperature distrrbution patterns. The flames attained with the medium primary air are fairly Well lengthened and less hard in V While the present invention has been described in connection with the details of certain embodiments thereof, it should be understood that these details are not intended to be limitative of the invention except insofar as set forth in the accompanying claims.
  • An infrared gas burner including in combination, a horizontally elongated straight tubular burner element of circular cross-section having a series of small ports at each side thereof disposed in a substantially horizontal plane parallel to the axis of the burner, and a radiation plate secured to the upper side of said burner element, said plate having a medial arcuate portion encircling approximately the upper ninety degrees along substantially the length of the tubular element, said plate having also oppositely disposed smooth imperforate side portions extending laterally and upwardly from the medial portion at an angle of about five degrees from the horizontal and along which the flames from said ports move in laminar flow outwardly with a scrubbing act-ion and are confined to the underside of said plate during operation of the burner, said plate having upstanding peripheral portions along the side and end edges of said side portions.
  • An infrared cooking unit comprising a cooking compart-ment having a top, an infrared gas burner in said compartment adjacent said top and including an elongated tubular burner element having a series of small ports at each side thereof disposed in a substantially horizontal plane relative to the burner, and a radiation plate secured to the upper side of said burner element, said plate having a central arcuate portion encircling approximately the upper ninety degrees of the tubular element, said plate having also oppositely disposed imperforate side portions extending laterally and upwardly from the central portion at an angle of about five degrees from the horizontal and along which the flames move outwardly with a scrubbing action during operation of the burner, said plate having upwardly extending corner portions normally spaced from the top of said compartment but engageable with the top upon some warpage of the plate, thereby to minimize further and undesirable warpage.
  • An infrared cooking unit comprising a cooking compartment having a top, an infrared gas burner in said compartment adjacent said top and including an elongated tubular burner element, and a radiation plate secured to the upper side of said burner element, said plate having oppositely disposed imperforate side portions extending laterally and upwardly from the central portion at an angle of about five degrees from the horizontal and along which the flames move outwardly with a scrubbing action during operation of the burner, said plate having upwardly extending corner portions normally spaced from the top of said compartment but engageable with the top upon some warpage of the plate, thereby to minimize further and undesirable warpage.
  • a radiation plate for attachment to a tubular gas burner element having a central portion for attachment to the upper side of the burner element and oppositely disposed imperforate side portions extending laterally and upwardly from the central portion at an angle of about five degrees from the horizontal, said plate having an upwardly extending flange around substantially its entire periphery, said flange having corner portions extending upwardly beyond the remainder of the flange.
  • a radiation plate for attachment to a tubular gas burner element having a central arcuate portion for attachment to the upper side of the burner element and oppositely disposed imperforate side portions extending laterally and upwardly from the central portion at an angle of about five degrees from the horizontal, said plate having an upwardly extending flange around substantially its entire periphery, said flange having corner portions extending upwardly beyond the remainder of the flange, said corner portions being smooth and rounded.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Baking, Grill, Roasting (AREA)
  • Gas Burners (AREA)
US447739A 1965-04-13 1965-04-13 Infrared gas burner Expired - Lifetime US3322112A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US447739A US3322112A (en) 1965-04-13 1965-04-13 Infrared gas burner
GB14064/66A GB1099175A (en) 1965-04-13 1966-03-30 A radiation plate for a tubular gas burner element
BE679228D BE679228A (OSRAM) 1965-04-13 1966-04-07
DE19661579671 DE1579671A1 (de) 1965-04-13 1966-04-13 Infrarotgasbrenner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US447739A US3322112A (en) 1965-04-13 1965-04-13 Infrared gas burner

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US3322112A true US3322112A (en) 1967-05-30

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US447739A Expired - Lifetime US3322112A (en) 1965-04-13 1965-04-13 Infrared gas burner

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US (1) US3322112A (OSRAM)
BE (1) BE679228A (OSRAM)
DE (1) DE1579671A1 (OSRAM)
GB (1) GB1099175A (OSRAM)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112912A (en) * 1976-06-16 1978-09-12 Ballentine Earle W Gas broiler
US4416249A (en) * 1976-12-10 1983-11-22 Reynolds Howard R Oven burner radiant
US4478205A (en) * 1983-11-04 1984-10-23 Modern Home Products Corp. Dual adjustable gas intake assembly
US4679544A (en) * 1983-11-04 1987-07-14 Modern Home Products Corp. Threaded adjustable gas intake assembly
US4773384A (en) * 1983-11-04 1988-09-27 Modern Home Products Corp. Adjustable gas intake assembly
EP1058054A1 (en) * 1999-06-01 2000-12-06 Timoteo Pezzutti Atmospheric gas burner of longitudinal type with a radiating element which is generating lateral conduits for the stabilization of the flames
EP1488700A1 (en) * 2003-06-20 2004-12-22 United Biscuits (Uk) Limited Burner and Radiator Assembly for a Tunnel Oven
US20050006373A1 (en) * 2000-02-15 2005-01-13 Vesture Corporation Apparatus and method for heated food delivery
US20060157469A1 (en) * 2005-01-19 2006-07-20 Coleman Marshall K Radiant cooking oven
US20070204852A1 (en) * 2005-09-16 2007-09-06 Kevin Cohen Infrared deck ovens
US20080210217A1 (en) * 2005-06-30 2008-09-04 Castfutura Spa Oven or Grill Burner
US20100307474A1 (en) * 2009-06-09 2010-12-09 Electrolux Home Products, Inc. Broil burner
WO2011073162A1 (en) 2009-12-17 2011-06-23 Arcelik Anonim Sirketi An oven comprising a burner
US20140290642A1 (en) * 2013-03-26 2014-10-02 Electrolux Home Products, Inc. Oven broil burner
US20160215973A1 (en) * 2015-01-23 2016-07-28 Superior Radiant Products Limited Radiant tube assembly
US20190195506A1 (en) * 2017-12-27 2019-06-27 National Chung-Shan Institute Of Science & Technology Kiln
US11421894B2 (en) * 2020-07-13 2022-08-23 Haier Us Appliance Solutions, Inc. Spill guard for a gas oven burner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB173593A (en) * 1920-09-30 1921-12-30 Bowden Wire Ltd Improvements in or relating to bunsen burners
FR771705A (fr) * 1932-12-01 1934-10-15 Guenet & Abbat Rampe de rotissoire ou de gril
US2794497A (en) * 1955-02-01 1957-06-04 Homer D Dufault Gas burner
US3174537A (en) * 1959-06-30 1965-03-23 Thompson Ramo Wooldridge Inc Electromagnetic radiant energy response apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB173593A (en) * 1920-09-30 1921-12-30 Bowden Wire Ltd Improvements in or relating to bunsen burners
FR771705A (fr) * 1932-12-01 1934-10-15 Guenet & Abbat Rampe de rotissoire ou de gril
US2794497A (en) * 1955-02-01 1957-06-04 Homer D Dufault Gas burner
US3174537A (en) * 1959-06-30 1965-03-23 Thompson Ramo Wooldridge Inc Electromagnetic radiant energy response apparatus

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112912A (en) * 1976-06-16 1978-09-12 Ballentine Earle W Gas broiler
US4416249A (en) * 1976-12-10 1983-11-22 Reynolds Howard R Oven burner radiant
US4478205A (en) * 1983-11-04 1984-10-23 Modern Home Products Corp. Dual adjustable gas intake assembly
US4679544A (en) * 1983-11-04 1987-07-14 Modern Home Products Corp. Threaded adjustable gas intake assembly
US4773384A (en) * 1983-11-04 1988-09-27 Modern Home Products Corp. Adjustable gas intake assembly
EP1058054A1 (en) * 1999-06-01 2000-12-06 Timoteo Pezzutti Atmospheric gas burner of longitudinal type with a radiating element which is generating lateral conduits for the stabilization of the flames
US20050006373A1 (en) * 2000-02-15 2005-01-13 Vesture Corporation Apparatus and method for heated food delivery
EP1488700A1 (en) * 2003-06-20 2004-12-22 United Biscuits (Uk) Limited Burner and Radiator Assembly for a Tunnel Oven
US20060157469A1 (en) * 2005-01-19 2006-07-20 Coleman Marshall K Radiant cooking oven
US20080210217A1 (en) * 2005-06-30 2008-09-04 Castfutura Spa Oven or Grill Burner
US20070204852A1 (en) * 2005-09-16 2007-09-06 Kevin Cohen Infrared deck ovens
US20100307474A1 (en) * 2009-06-09 2010-12-09 Electrolux Home Products, Inc. Broil burner
US8789522B2 (en) * 2009-06-09 2014-07-29 Electrolux Home Products, Inc. Broil burner
WO2011073162A1 (en) 2009-12-17 2011-06-23 Arcelik Anonim Sirketi An oven comprising a burner
RU2509264C1 (ru) * 2009-12-17 2014-03-10 Арчелык Аноним Ширкети Духовка, содержащая горелку
US20140290642A1 (en) * 2013-03-26 2014-10-02 Electrolux Home Products, Inc. Oven broil burner
US9609982B2 (en) * 2013-03-26 2017-04-04 Electrolux Home Products, Inc. Oven broil burner
US20160215973A1 (en) * 2015-01-23 2016-07-28 Superior Radiant Products Limited Radiant tube assembly
US20190195506A1 (en) * 2017-12-27 2019-06-27 National Chung-Shan Institute Of Science & Technology Kiln
US11421894B2 (en) * 2020-07-13 2022-08-23 Haier Us Appliance Solutions, Inc. Spill guard for a gas oven burner

Also Published As

Publication number Publication date
GB1099175A (en) 1968-01-17
BE679228A (OSRAM) 1966-10-07
DE1579671A1 (de) 1970-08-06

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