GB1238491A - - Google Patents

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Publication number
GB1238491A
GB1238491A GB1238491DA GB1238491A GB 1238491 A GB1238491 A GB 1238491A GB 1238491D A GB1238491D A GB 1238491DA GB 1238491 A GB1238491 A GB 1238491A
Authority
GB
United Kingdom
Prior art keywords
plates
plate
heat
fluids
heat exchanger
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
Application number
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 filed Critical
Publication of GB1238491A publication Critical patent/GB1238491A/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
    • F25J5/002—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants for continuously recuperating cold, i.e. in a so-called recuperative heat exchanger
    • F25J5/005—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants for continuously recuperating cold, i.e. in a so-called recuperative heat exchanger in a reboiler-condenser, e.g. within a column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
    • F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
    • F25J5/002—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants for continuously recuperating cold, i.e. in a so-called recuperative heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0037—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/24—Processes or apparatus using other separation and/or other processing means using regenerators, cold accumulators or reversible heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/02—Bath type boiler-condenser using thermo-siphon effect, e.g. with natural or forced circulation or pool boiling, i.e. core-in-kettle heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/42—Modularity, pre-fabrication of modules, assembling and erection, horizontal layout, i.e. plot plan, and vertical arrangement of parts of the cryogenic unit, e.g. of the cold box
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/44—Particular materials used, e.g. copper, steel or alloys thereof or surface treatments used, e.g. enhanced surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/02—Fastening; Joining by using bonding materials; by embedding elements in particular materials
    • F28F2275/025—Fastening; Joining by using bonding materials; by embedding elements in particular materials by using adhesives
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/355—Heat exchange having separate flow passage for two distinct fluids
    • Y10S165/356—Plural plates forming a stack providing flow passages therein
    • Y10S165/373—Adjacent heat exchange plates having joined bent edge flanges for forming flow channels therebetween

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

1,238,491. Plate heat exchangers. LINDE A.G. 29 Oct., 1968 [3 Nov., 1967], No. 61203/68. Heading F4S. In a heat exchanger plate pack in which the plates e.g. 70, 71, 72, 73 are bonded together by an adhesive, preferably a heat-hardenable synthetic resin, each plate has non-corrugated fluid inlet and outlet zones e.g. 78, 79 and has also a central zone which is corrugated with straight or sinuous corrugations of trapezoidal form wherein the corrugations of adjacent plates are relatively offset by half a corrugation so that fluid passages 90 are formed by the plates as shown in Fig. 5. Heat transfer and turbulator elements in the form of springy, ribbed, embossed or twisted strips 93 or 94 may be inserted in these passages. In the fluid inlet and outlet zones of the plates each plate may have formed therein a series of spacers 6 extending alternately from opposite faces of the plate, and being directed towards the spacers of adjacent plates to provide mutual support. By suitably profiling the plates the heat exchanging fluids may be caused to enter and leave the fluid spaces at the sides or at the ends of the plates as indicated by the arrows 80, 83. Headers (not shown) convey the fluids to or from the plate interspaces. The plate stack may be strengthened by strips 91 (Fig. 5) inserted into the gaps formed between the edges of each pair of consecutive plates and by thick plates 92 disposed at the ends of the stack. The heat exchanger may be utilized for the cooling of air prior to its liquefaction and rectification wherein four fluids may be in heat exchange viz. air, nitrogen, oxygen and a gas to be heated for use in a lowpressure turbine. In this case eight headers are required two each on the long sides and two each on the short sides of the plate stack. The plate material may comprise copper, brass, aluminium, aluminium alloy, or steel sheet. An example giving typical dimensions of the heat exchanger plates is described.
GB1238491D 1967-11-03 1968-10-29 Expired GB1238491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671601216 DE1601216B2 (en) 1967-11-03 1967-11-03 TIN PANEL FOR PLATE HEAT EXCHANGER WITH A STACK OF SUCH TIN PANELS

Publications (1)

Publication Number Publication Date
GB1238491A true GB1238491A (en) 1971-07-07

Family

ID=5680889

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1238491D Expired GB1238491A (en) 1967-11-03 1968-10-29

Country Status (5)

Country Link
US (1) US3590917A (en)
BE (1) BE723137A (en)
DE (1) DE1601216B2 (en)
FR (1) FR1590755A (en)
GB (1) GB1238491A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287918A (en) * 1990-06-06 1994-02-22 Rolls-Royce Plc Heat exchangers
US5385204A (en) * 1989-08-25 1995-01-31 Rolls-Royce Plc Heat exchanger and methods of manufacture thereof
US5505256A (en) * 1991-02-19 1996-04-09 Rolls-Royce Plc Heat exchangers and methods of manufacture thereof
GB2362456A (en) * 2000-04-17 2001-11-21 Nordon Cryogenie Snc Heat exchange fin
US10156405B2 (en) 2012-04-05 2018-12-18 Alfa Laval Corporate Ab Plate heat exchanger
EP3730890A1 (en) 2019-04-24 2020-10-28 Vysoká Skola Bánská - Technická Univerzita Ostrava Plate heat exchanger
WO2023006132A1 (en) 2021-07-28 2023-02-02 Vysoká Škola Báňská - Technická Univerzita Ostrava Plate heat exchanger

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US3810509A (en) * 1971-10-15 1974-05-14 Union Carbide Corp Cross flow heat exchanger
US3757855A (en) * 1971-10-15 1973-09-11 Union Carbide Corp Primary surface heat exchanger
US3757856A (en) * 1971-10-15 1973-09-11 Union Carbide Corp Primary surface heat exchanger and manufacture thereof
GB1433379A (en) * 1973-08-24 1976-04-28 Nevsky Mashinostroitelny Z Im Heat exchange apparatus
JPS52144852A (en) * 1976-05-28 1977-12-02 Panafacom Ltd Heat exchanger
JPS6032800B2 (en) * 1979-06-01 1985-07-30 株式会社日立製作所 Heat exchanger
US4475589A (en) * 1981-01-21 1984-10-09 Tokyo Shibaura Denki Kabushiki Kaisha Heat exchanger device
DE3220774C2 (en) * 1982-06-02 1986-09-25 W. Schmidt GmbH & Co KG, 7518 Bretten Plate evaporator or condenser
SE451181B (en) * 1985-01-29 1987-09-14 Zetterlund Engineering Ab SET AND DEVICE FOR SCRAPPING IN SEDIMENTATION POOL
US4758385A (en) * 1987-06-22 1988-07-19 Norsaire Systems Plate for evaporative heat exchanger and evaporative heat exchanger
US4872578A (en) * 1988-06-20 1989-10-10 Itt Standard Of Itt Corporation Plate type heat exchanger
GB8917241D0 (en) * 1989-07-28 1989-09-13 Cesaroni Anthony Joseph Corrugated thermoplastic sheet having fluid flow passages
US5381510A (en) * 1991-03-15 1995-01-10 In-Touch Products Co. In-line fluid heating apparatus with gradation of heat energy from inlet to outlet
US5245693A (en) * 1991-03-15 1993-09-14 In-Touch Products Co. Parenteral fluid warmer apparatus and disposable cassette utilizing thin, flexible heat-exchange membrane
DE4223321A1 (en) * 1992-07-16 1994-01-20 Tenez A S Welded plate heat exchanger
DE29607547U1 (en) * 1996-04-26 1996-07-18 SKS-Stakusit-Kunststoff GmbH & Co. KG, 47198 Duisburg Plate-type heat exchanger
DE19635552C1 (en) * 1996-09-02 1998-03-12 Slg Pruef Und Zertifizierungs Heat exchanger
US6047108A (en) * 1996-10-01 2000-04-04 Baxter International Inc. Blood warming apparatus
US5846224A (en) * 1996-10-01 1998-12-08 Baxter International Inc. Container for use with blood warming apparatus
JP3685890B2 (en) * 1996-10-17 2005-08-24 本田技研工業株式会社 Heat exchanger
DE19648139A1 (en) * 1996-11-21 1998-05-28 Klingenburg Gmbh Counterflow heat exchanger
GB2343643B (en) * 1998-11-10 2002-01-16 Centrax Ltd Heat exchanger
GB9903908D0 (en) 1999-02-19 1999-04-14 Boc Group Plc Air separation
SE513784C2 (en) * 1999-03-09 2000-11-06 Alfa Laval Ab Permanently joined plate heat exchanger
FR2797039B1 (en) * 1999-07-27 2001-10-12 Ziepack HEAT EXCHANGER IN RELATED EXCHANGE MODULE
GB9926629D0 (en) * 1999-11-10 2000-01-12 Boc Group Plc Heat exchangers
US6840313B2 (en) * 1999-12-27 2005-01-11 Sumitomo Precision Products Co., Ltd. Plate fin type heat exchanger for high temperature
US20040091735A1 (en) * 2001-01-08 2004-05-13 Frieder Flamm Method for producing evaporator boards
JP2002243395A (en) * 2001-02-15 2002-08-28 Sanden Corp Heat exchanger and its manufacturing method
EP1513963A1 (en) * 2002-06-14 2005-03-16 Tosoh Smd, Inc. Target and method of diffusion bonding target to backing plate
JP4418182B2 (en) * 2003-06-25 2010-02-17 ソマール株式会社 HEAT EXCHANGER FORMING MATERIAL, HEAT EXCHANGER MANUFACTURING METHOD USING THE SAME, AND HEAT EXCHANGER
WO2006042015A1 (en) * 2004-10-07 2006-04-20 Brooks Automation, Inc. Efficient heat exchanger for refrigeration process
US7646608B2 (en) * 2005-09-01 2010-01-12 Gm Global Technology Operations, Inc. Heat transfer plate
JP2007162974A (en) * 2005-12-09 2007-06-28 Xenesys Inc Heat exchange plate
SE531472C2 (en) * 2005-12-22 2009-04-14 Alfa Laval Corp Ab Heat exchanger with heat transfer plate with even load distribution at contact points at port areas
CN101541522B (en) * 2006-08-28 2012-07-18 丹塞姆空气调节有限公司 Method for manufacturing a heat exchanger
CZ300999B6 (en) * 2007-09-27 2009-10-07 2 V V S. R. O. Counter-current recuperative heat exchanger
US8376036B2 (en) * 2007-11-02 2013-02-19 Az Evap, Llc Air to air heat exchanger
US8028410B2 (en) * 2008-12-08 2011-10-04 Randy Thompson Gas turbine regenerator apparatus and method of manufacture
EP2432443A4 (en) * 2009-05-22 2013-01-16 Agency Science Tech & Res A flexible fluid storage and warming bag and a fluid storage and warming system
US20110088417A1 (en) * 2009-10-19 2011-04-21 Kayser Kenneth W Energy Recovery Ventilator And Dehumidifier
FR2961892A1 (en) * 2010-06-29 2011-12-30 Air Liquide Installation for separating air by cryogenic distillation, has conduit sending product to auxiliary exchanger, and conveying unit sending compressed air from adsorption unit to main exchanger
DE102010030781A1 (en) * 2010-06-30 2012-01-05 Sgl Carbon Se Heat exchanger plate, thus provided plate heat exchanger and method for producing a plate heat exchanger
US9151539B2 (en) * 2011-04-07 2015-10-06 Hamilton Sundstrand Corporation Heat exchanger having a core angled between two headers
US9643391B2 (en) * 2011-08-11 2017-05-09 Mahle International Gmbh Device for controlling the temperature of an energy accumulator, more particularly for a vehicle, and method for production thereof
US9359952B2 (en) 2012-02-03 2016-06-07 Pratt & Whitney Canada Corp Turbine engine heat recuperator plate and plate stack
EP2657636B1 (en) * 2012-04-23 2015-09-09 GEA Ecoflex GmbH Plate heat exchanger
EP2657635B1 (en) * 2012-04-23 2015-06-10 GEA Ecoflex GmbH Plate heat exchanger
CA3083317C (en) * 2012-09-20 2021-02-09 Airia Leasing Inc. Planar plate core and method of assembly
US9283608B2 (en) 2013-05-13 2016-03-15 Intri-Plex Technologies, Inc. Disk separator plates and method of making disk separator plates for hard disk drives
JP2016200316A (en) * 2015-04-08 2016-12-01 セイコーエプソン株式会社 Heat exchange device, cooling device and projector
DE102015107468A1 (en) * 2015-05-12 2016-11-17 Benteler Automobiltechnik Gmbh Automotive heat exchanger system
DE102015107442A1 (en) * 2015-05-12 2016-11-17 Benteler Automobiltechnik Gmbh Automotive heat exchanger system
EP3426986B1 (en) * 2016-03-09 2019-11-20 Bekaert Combustion Technology B.V. Sectional heat exchanger for use in a heat cell
ES2733574T3 (en) * 2016-10-07 2019-12-02 Alfa Laval Corp Ab Heat exchange plate and heat exchanger
WO2019041046A1 (en) 2017-08-31 2019-03-07 Dana Canada Corporation Multi-fluid heat exchanger
ES2926530T3 (en) * 2018-10-30 2022-10-26 Cadro Ind Gmbh & Co Kg Procedure for manufacturing a heat exchanger and heat exchanger
WO2020192666A1 (en) * 2019-03-28 2020-10-01 浙江三花汽车零部件有限公司 Heat exchanger and heat exchange device
CN113318466B (en) * 2019-07-02 2022-07-12 江苏远卓设备制造有限公司 Implementation method of plate-type evaporator
JP6970360B2 (en) * 2020-02-10 2021-11-24 ダイキン工業株式会社 Heat exchanger and heat pump system with it
US11745118B1 (en) 2022-06-02 2023-09-05 Ace Machine Design Llc Mechanical vapor recompression solvent recovery
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5385204A (en) * 1989-08-25 1995-01-31 Rolls-Royce Plc Heat exchanger and methods of manufacture thereof
US5287918A (en) * 1990-06-06 1994-02-22 Rolls-Royce Plc Heat exchangers
US5505256A (en) * 1991-02-19 1996-04-09 Rolls-Royce Plc Heat exchangers and methods of manufacture thereof
GB2362456A (en) * 2000-04-17 2001-11-21 Nordon Cryogenie Snc Heat exchange fin
GB2362456B (en) * 2000-04-17 2004-03-17 Nordon Cryogenie Snc Corrugated fin for a plate-type heat exchanger and corresponding plate-type heat exchanger
US10156405B2 (en) 2012-04-05 2018-12-18 Alfa Laval Corporate Ab Plate heat exchanger
EP3730890A1 (en) 2019-04-24 2020-10-28 Vysoká Skola Bánská - Technická Univerzita Ostrava Plate heat exchanger
WO2023006132A1 (en) 2021-07-28 2023-02-02 Vysoká Škola Báňská - Technická Univerzita Ostrava Plate heat exchanger

Also Published As

Publication number Publication date
FR1590755A (en) 1970-04-20
BE723137A (en) 1969-04-01
US3590917A (en) 1971-07-06
DE1601216B2 (en) 1971-06-16
DE1601216A1 (en) 1970-03-26

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees