US3770408A - Annealing lehr - Google Patents

Annealing lehr Download PDF

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Publication number
US3770408A
US3770408A US00198849A US3770408DA US3770408A US 3770408 A US3770408 A US 3770408A US 00198849 A US00198849 A US 00198849A US 3770408D A US3770408D A US 3770408DA US 3770408 A US3770408 A US 3770408A
Authority
US
United States
Prior art keywords
roof
housing
fans
burners
lehr
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
US00198849A
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English (en)
Inventor
Cully J Mc
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.)
Surface Combustion Corp
Grimes Aerospace Co
Original Assignee
Midland Ross Corp
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 Midland Ross Corp filed Critical Midland Ross Corp
Application granted granted Critical
Publication of US3770408A publication Critical patent/US3770408A/en
Assigned to FL AEROSPACE CORP. reassignment FL AEROSPACE CORP. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). 9/11/86 AND 1/05/88, OHIO Assignors: MIDLAND - ROSS CORPORATION, CHANGED TO, MIDLAND-ROSS CORPORATION MERGING INTO, MRC MERGER CORP., CHANGED NAME TO
Assigned to SURFACE COMBUSTION, INC. reassignment SURFACE COMBUSTION, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FL AEROSPACE CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B25/00—Annealing glass products
    • C03B25/04—Annealing glass products in a continuous way
    • C03B25/06—Annealing glass products in a continuous way with horizontal displacement of the glass products
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/10—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by hot air or gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/243—Endless-strand conveyor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/04—Circulating atmospheres by mechanical means
    • F27D2007/045—Fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2001/00—Composition, conformation or state of the charge
    • F27M2001/07—Glass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2003/00—Type of treatment of the charge
    • F27M2003/01—Annealing
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]

Definitions

  • ABSTRACT An endless belt conveyor annealing lehr having burner means located above the belt.
  • the belt is foraminous and supported throughout the length of the lehr by a system of perforated plates.
  • a shroud extends intermediate the walls of the lehr and a fan is located adjacent to the burner means outlet. This combination results in a continuous circulating atmosphere impinging directly upon the work being conveyed through the lehr.
  • Means is also provided to control the temperature of the work throughout the length of the lehr, particularly at the entrance thereof.
  • an object of this invention to provide an annealing lehr, or furnace, which anneals work with a higher percentage of heat being transferred by convection.
  • FIG. 1 is a perspective view of the type of annealing lehr to which the invention is applicable.
  • FIG. 2 is a partially schematic, longitudinal crosssectional view of the entrance end of an annealing lehr embodying the principles of this invention.
  • FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 2.
  • FIG. 4 is a longitudinal cross-sectional view of the static cooling section of the annealing lehr shown in FIG. 1.
  • FIG. 5 is a longitudinal cross-sectional view showing a portion of the forced cooling section of the lehr shown in FIG. 1 and the discharge end thereof.
  • FIG. 6 is a longitudinal cross-sectional view of the entrance end of the annealing lehr shown in FIG. 1 with a unique burner means.
  • FIG. 7 is a cross-sectional view of the lehr having the unique burner means shown in FIG. 6 taken along line 77.
  • an annealing lehr is shown generally at 10 which comprises a housing 11, or heating chamber, a staticcooling chamber 12, and a forced cooling chamber 13.
  • the housing 11 has a roof 14, a floor 16, first side wall 18, and second side wall 20.
  • the roof l4, floor l6, and walls 18, of the housing 11 are made of refractory insulation 22 which is supported on the outside by a steel casing 24 and on the inside by a metal lining 25.
  • the housing 11 has an entrance opening 26 with an adjustable door 28.
  • Supporting the housing 1 1 are a plurality of laterally extending channel sections 34 which are secured to longitudinally spaced legs 36 which are in contact with the floor of a building or the ground.
  • the static cooling chamber 12 Downstream from the housing 11 is the static cooling chamber 12 which has a pair of longitudinally extending channel irons 40 that support transverse channel members 42. Located below the channel members 42 is a plate 44 which, in cooperation with chamber side walls 43, encloses the cooling chamber 12. A plurality of legs 46 support the longitudinally extending channel irons 40 and the static cooling chamber 12 is provided with a roof 48 having a plurality of openings 50 therein,
  • the forced cooling chamber. 13 has aroof 60 containing a plurality of openings 62.
  • a plurality'of fan assemblies 64 are disposed on the roof 60, there being a fan assembly located above each of the openings.
  • Situated along the length of the forced cooling chamber 13 i I I are a plurality of flexible curtains 66 which assist in directing the flow of cooling air downwardly.
  • a drive roller 72 having afriction surface, located below the floor of the furnace and a snub roll 74.
  • a continuous foraminous belt 76 such as a mesh belt, is turned and driven by the rollers 72, 74 in conveying work 75 through the lehr.
  • rollers 77 having tension means (not' shown) provided to take up slack in the belt 76.
  • the belt 76 is supported within the housing 11 by a longitudinally extending plate 78 which has a plurality of openings 79, or perforations, therein.
  • the plate 78 is, in turn, supported by transversely extending angle irons 80 which are attached to a pair of longitudinally extending support members 81.
  • a fan assembly 84 is positioned above each opening 82 and supported by the roof 14.
  • Each fan assembly has a shaft 86 extending through the opening 82 and a fan blade 88 located at the lower end of each shaft.
  • the housing 11 is composed of a plurality of zones, each zone being determined by the location and influence of the fan assemblies 84.
  • each fan assembly 84 Extending through the side wall 18 at the location of each fan assembly 84 is a ported tube 90 which is supplied with combustible gas from a source 92. Extending the length of the housing 12 is a metallic shroud 94 which is spaced relative to the roof 14, side walls 18 and 20, and terminates a short distance below the upper location of the belt 76.
  • the shroud 94 has a plurality of first openings 96 which are aligned with the fan blades 88 and a second plurality of openings 97 which receive the ported tubes 90.
  • a plurality of vanes 98 are attached to the shroud 94 and extend from the opening 96 outwardly to direct the wind from the fan blade 88 '3 and intermediate the plenum 100 defined by the shroud 94, roof 14, and side walls 18, 20.
  • a plurality of thermocouples 102 Positioned at locations within the housing 11 to correspond to the locations of the fan assemblies 84 are a plurality of thermocouples 102 which are connected to an instrument 104 which controls the gas source 92 in response to the temperature measured by the thermocouples.
  • natural gas is supplied from the source 92 to the ported tube burners 90 wherein the gas is combusted with air as it leaves the ports of the burner.
  • the products of combustion are drawn upwardly by the fan blade 88, mix with the recirculating atmosphere, and subsequently devolve between the plenum 100 defined by the shroud 94 and panels 25.
  • the recirculating atmosphere then is forced upward from the bottom of the housing 11 by pressure created by the fans 84 and moves upwardly through the perforations 79 in the plate 78. Since the belt is foraminous, the recirculating atmosphere directly contacts the work 75 that is supported upon the belt 76. In this manner there is intimate contact between the work and the recirculating atmosphere so that a high percentage of the heat transferred to the work is by convection. The heat transfer is also aided by the high velocity with which the hot gas impinges against the work 75.
  • the furnace housing is divided into zones, each being defined by the location of a fan assembly 84.
  • the temperature of each zone is controlled by the thermocouples 102 through the controller 104.
  • the respective source of gas will be discontinued and, conversely, gas will be supplied to the burners 90 after the temperature falls before a preset minimum.
  • the work 75 will at times enter the first zone at a temperature above the desired annealing temperature.
  • the entrance zone may be operated in such a manner as to cool the incoming work 75 when required, by omitting the source of heat and allowing the first zone to act as a cooling zone.
  • FIGS. 6 and 7 An alternate burner means 105 for providing combustion gases to the fan assemblies 84 for circulation is shown in FIGS. 6 and 7.
  • the burner means 105 comprises a combustor 106 secured to the roof 14 of the housing 11.
  • the combustor is supplied with a gas line 107, which communicates with the source 92, and an air line 109.
  • the combustor emits combusting gases into an annular chamber 108 that is received within an opening 110 of the roof.
  • the chamber l08' has a refractory lining 112 which serves to prevent loss of heat and protect the roof from heat damage.
  • each chamber 108 Depending from each chamber 108 are a plurality of straps 114 which have a shoe 116 attached to the lower ends thereof, each of which shoes opens in the direction of its associated fan assembly 84. As can be determined from the drawing, hot gases are directed downwardly from the chamber 108 and are deflected into a horizontal direction by the shoes 116. The gases are then drawn by the fan blades 88 and circulated as described previously.
  • the burner means 105 just described is supported by the roof 14 and is thus removed as a hazard.
  • the burner means 105 also has an advantage in that a broad path is provided for the hot gases.
  • a lehr for heatftreating in a continuous operation comprising: an elongated housing having a roof, spaced side walls, a floor,'an entrance opening and an exit opening, support means disposed along the length of the housing intermediate the roof and the floor, a foraminous belt received within the housing and supported along the length thereof by said support means, means for conveying the belt through said furnace, a plurality of longitudinally spaced-fans received within the roof, a longitudinally extending shroud within the housing spaced relative to the roof and the side walls and terminating above the floor to define a plenum in combination with said side walls androof and an opening in combination with said floor, said shroud having a plurality of openings which are aligned with said fans, a plurality of longitudinally spaced burners received within and extending into said housing, said burners being mounted in such a manner that the productsof combustion are drawn into the circulating path generated by said fans, means for supplying fuel to said burners, means for sensing the temperature along the length of
  • a lehr for heat treating of work in a continuous operation comprising: an elongated housing having a roof, spaced side walls, a floor, an entrance opening and an exit opening, a longitudinally extending, porous plate received within said housing, an endless foraminous belt supported by said plate, means for conveying said belt along said plate, a plurality of longitudinally spaced fans received within said roof, a shroud extending within the length of the housing spaced relative to the roof and side walls to define a plenum therebetween, said shroud terminating at approximately the location of said plate to define an opening therebetween, said shroud having an opening at each location of said fans, a plurality of longitudinally spaced burners received within one of said side walls and extending intermediate said belt and said fans, said burners being mounted in such a manner that the products of combustion are drawn into the circulating path generated by said fans, means for supplying fuel to said burners, means for sensing the temperature along the length of said housing, and means for supplying fuel to said burners in response to
  • a lehr for heat treating in a continuous operation comprising: an elongated housing having a roof, spaced side walls, a floor, an entrance opening and an exit opening, support means disposed along the length -of the housing intermediate the roof and the floor, a foraminous belt received within the housing and supported along the-length thereof by said support means, means for conveying the belt through said housing, a plurality of spaced fans received within the roof, a longitudinally extending shroud within the housing spaced relative to the roof and the side walls and terminating above the floor to define a plenum in combination with said side walls and roof and an opening in combination with said floor, said shroud having a first plurality of openings whichare aligned with said fans and a second plurality of openings, a plurality of longitudinally spaced burners received within said roof and extending into said housing and said shroud through said second plurality of openings, said burners being mounted in such a manner that the products of combustion are drawn into the circulating path generated by said fans, means
  • a lehr for heat treating work in a continuous operation comprising: an elongated housing having a roof, spaced side walls, a floor, an entrance opening and an exit opening, a longitudinally extending, porous plate received within said housing, an endless foraminous belt supported by said plate, means for conveying said belt along said plate, a plurality of longitudinally spaced fans received within said roof, a shroud extending within the length of the housing spaced relative to the roof and side walls to define a plenum therebetween, said shroud terminating at approximately the location of said plate to define an opening therebetween, said shroud having a first series of openings at each location of said fans, a plurality of longitudinally spaced combustors received within said roof and operative to direct combusting gases downwardly, said shroud having a second series of openings at each location of said combustor, a shoe located beneath each combustor having means to deflect gases from the com bustor horizontally into the circulating path generated by said fans,

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Tunnel Furnaces (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Manufacturing Of Cigar And Cigarette Tobacco (AREA)
US00198849A 1971-11-15 1971-11-15 Annealing lehr Expired - Lifetime US3770408A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19884971A 1971-11-15 1971-11-15

Publications (1)

Publication Number Publication Date
US3770408A true US3770408A (en) 1973-11-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00198849A Expired - Lifetime US3770408A (en) 1971-11-15 1971-11-15 Annealing lehr

Country Status (5)

Country Link
US (1) US3770408A (fr)
JP (1) JPS5755661B2 (fr)
CA (1) CA980122A (fr)
FR (1) FR2161563A5 (fr)
GB (1) GB1393150A (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4715272A (en) * 1985-07-02 1987-12-29 Mendoza Fausto C System for preparing tortillas
US4865864A (en) * 1985-03-27 1989-09-12 Rijswijck Willem V Air heated oven and heating method
US4962695A (en) * 1988-07-27 1990-10-16 Northrup Jr Lynn L Broiler oven
US5023429A (en) * 1989-10-11 1991-06-11 Flakee Mills, Inc. Vessel and method for thermally processing bulk material
US5028399A (en) * 1990-01-12 1991-07-02 Motorola, Inc. Gas manifold for solder reflow processing atmosphere
US5193735A (en) * 1992-07-13 1993-03-16 Knight Electronics, Inc. Solder reflow oven
US5403607A (en) * 1987-02-17 1995-04-04 American Harvest, Inc. Method for rapidly cooking food
US5466912A (en) * 1993-04-13 1995-11-14 American Harvest, Inc. Convection oven
US20020194879A1 (en) * 2001-05-08 2002-12-26 Junichiro Takei Glass base material manufacturing apparatus and method thereof
US6677013B1 (en) 1998-04-17 2004-01-13 Pechiney Emballage Flexible Europe Transparent multilayer polypropylene container with barrier protection
US7651781B2 (en) 2001-10-24 2010-01-26 Ball Corporation Polypropylene container and process for making the same
CN102491628A (zh) * 2011-11-14 2012-06-13 湖北戈碧迦光电科技股份有限公司 一种玻璃退火装置及退火方法
CN102627184A (zh) * 2012-04-01 2012-08-08 张家港市嘉华炉业有限公司 固化炉中的双支撑式高压气瓶的输送装置
CN102627189A (zh) * 2012-04-01 2012-08-08 张家港市嘉华炉业有限公司 固化炉中的悬臂式高压气瓶的输送装置
CN102653443A (zh) * 2012-05-05 2012-09-05 张家港市云雾实业有限公司 香水玻璃瓶退火炉
US11045047B2 (en) 2017-11-10 2021-06-29 Ron's Enterprises, Inc. Variable capacity oven
US11293071B2 (en) * 2018-09-10 2022-04-05 Koyo Thermo Systems Co., Ltd. Heat treatment apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028052A (en) * 1974-11-04 1977-06-07 Smit Ovens Nijmegen B.V. Tunnel furnace for the heat treatment of articles
US4150964A (en) * 1977-01-31 1979-04-24 Owens-Illinois, Inc. Apparatus for coating glassware
DE7924727U1 (de) * 1979-08-31 1980-01-03 Brown, Boveri & Cie Ag, 6800 Mannheim Mantelstrahlheizrohr

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544947A (en) * 1946-01-19 1951-03-13 Pittsburgh Corning Corp Lehr temperature control
US2725680A (en) * 1953-07-17 1955-12-06 Pittsburgh Corning Corp Annealing lehr
US2982052A (en) * 1955-07-28 1961-05-02 British Hartford Fairmont Ltd Lehrs for glassware

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS43390Y1 (fr) * 1967-03-06 1968-01-10

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544947A (en) * 1946-01-19 1951-03-13 Pittsburgh Corning Corp Lehr temperature control
US2725680A (en) * 1953-07-17 1955-12-06 Pittsburgh Corning Corp Annealing lehr
US2982052A (en) * 1955-07-28 1961-05-02 British Hartford Fairmont Ltd Lehrs for glassware

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4865864A (en) * 1985-03-27 1989-09-12 Rijswijck Willem V Air heated oven and heating method
US4715272A (en) * 1985-07-02 1987-12-29 Mendoza Fausto C System for preparing tortillas
US5403607A (en) * 1987-02-17 1995-04-04 American Harvest, Inc. Method for rapidly cooking food
US5513558A (en) * 1987-02-17 1996-05-07 American Harvest, Inc. Rapid cooking device
US4962695A (en) * 1988-07-27 1990-10-16 Northrup Jr Lynn L Broiler oven
US5023429A (en) * 1989-10-11 1991-06-11 Flakee Mills, Inc. Vessel and method for thermally processing bulk material
US5028399A (en) * 1990-01-12 1991-07-02 Motorola, Inc. Gas manifold for solder reflow processing atmosphere
US5193735A (en) * 1992-07-13 1993-03-16 Knight Electronics, Inc. Solder reflow oven
US5466912A (en) * 1993-04-13 1995-11-14 American Harvest, Inc. Convection oven
US6677013B1 (en) 1998-04-17 2004-01-13 Pechiney Emballage Flexible Europe Transparent multilayer polypropylene container with barrier protection
US20020194879A1 (en) * 2001-05-08 2002-12-26 Junichiro Takei Glass base material manufacturing apparatus and method thereof
US20080087048A1 (en) * 2001-05-08 2008-04-17 Junichiro Takei Glass base material manufacturing apparatus and method thereof
US7651781B2 (en) 2001-10-24 2010-01-26 Ball Corporation Polypropylene container and process for making the same
US8158052B2 (en) 2001-10-24 2012-04-17 Ball Corporation Polypropylene container and process for making the same
CN102491628A (zh) * 2011-11-14 2012-06-13 湖北戈碧迦光电科技股份有限公司 一种玻璃退火装置及退火方法
CN102627184A (zh) * 2012-04-01 2012-08-08 张家港市嘉华炉业有限公司 固化炉中的双支撑式高压气瓶的输送装置
CN102627189A (zh) * 2012-04-01 2012-08-08 张家港市嘉华炉业有限公司 固化炉中的悬臂式高压气瓶的输送装置
CN102653443A (zh) * 2012-05-05 2012-09-05 张家港市云雾实业有限公司 香水玻璃瓶退火炉
US11045047B2 (en) 2017-11-10 2021-06-29 Ron's Enterprises, Inc. Variable capacity oven
US11293071B2 (en) * 2018-09-10 2022-04-05 Koyo Thermo Systems Co., Ltd. Heat treatment apparatus

Also Published As

Publication number Publication date
JPS4859118A (fr) 1973-08-18
FR2161563A5 (fr) 1973-07-06
CA980122A (en) 1975-12-23
JPS5755661B2 (fr) 1982-11-25
GB1393150A (en) 1975-05-07

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SURFACE COMBUSTION, INC., OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FL AEROSPACE CORP.;REEL/FRAME:005091/0582

Effective date: 19880608

Owner name: FL AEROSPACE CORP.

Free format text: CHANGE OF NAME;ASSIGNORS:MIDLAND-ROSS CORPORATION MERGING INTO;MRC MERGER CORP., CHANGED NAME TO;MIDLAND - ROSS CORPORATION, CHANGED TO;REEL/FRAME:005240/0352

Effective date: 19880926