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GB1354502A - Heat exchangers - Google Patents

Heat exchangers

Info

Publication number
GB1354502A
GB1354502A GB4160370A GB1354502DA GB1354502A GB 1354502 A GB1354502 A GB 1354502A GB 4160370 A GB4160370 A GB 4160370A GB 1354502D A GB1354502D A GB 1354502DA GB 1354502 A GB1354502 A GB 1354502A
Authority
GB
United Kingdom
Prior art keywords
block
sheets
plastics material
heat exchangers
spacers
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
GB4160370A
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of GB1354502A publication Critical patent/GB1354502A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F28F21/065—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing plate-like or laminated conduits
    • 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
    • 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
    • Y10S165/387—Plural plates forming a stack providing flow passages therein including side-edge seal or edge spacer bar
    • Y10S165/392—Unitary heat exchange plate and projecting edge

Landscapes

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

Abstract

1354502 Plate heat exchangers IMPERIAL CHEMICAL INDUSTRIES Ltd 4 Aug 1971 [28 Aug 1970] 41603/70 Heading F4S A heat exchanger block consists of a plurality of sheets (e.g. 0À1 to 1 mm. thick) made of a plastics material selected from fluorocarbon polymers, aromatic polyimides, high density polyethylene or polypropylene, adjacent sheets being spaced from one another by edge spacers, e.g. 12 (also of plastics material), which may be integral with or separately formed from the sheets. The spacers provide fluid passages 0À05 to 1 mm. thick between adjacent sheets. The elements of the block are bonded together by an adhesive or as a step followed by sintering, in the final curing of the plastics material. The material used may be a glass-filled composition for strength or a carbon-filled composition to increase heat transfer. Cross flow heat exchangers are described wherein the passages, e.g. 14, 15, Fig. 4, formed between adjacent sheets extend at right angles to each other through the block. Each passage may be further subdivided longitudinally by one or more intermediate spacers, e.g. 11 (or 47, Fig. 6), and these may be bonded to or integral with the plates or merely located in recesses in the plates. Headers which may have PTFE linings are clamped to the block (Fig. 5).
GB4160370A 1970-08-28 1970-08-28 Heat exchangers Expired GB1354502A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4160370 1970-08-28

Publications (1)

Publication Number Publication Date
GB1354502A true GB1354502A (en) 1974-06-05

Family

ID=10420460

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4160370A Expired GB1354502A (en) 1970-08-28 1970-08-28 Heat exchangers

Country Status (4)

Country Link
US (1) UST911013I4 (en)
DE (1) DE2143020A1 (en)
FR (1) FR2103583A1 (en)
GB (1) GB1354502A (en)

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303125A (en) * 1979-04-26 1981-12-01 Vahlbrauk Karl Heinz Heat exchange structural element
US4475589A (en) * 1981-01-21 1984-10-09 Tokyo Shibaura Denki Kabushiki Kaisha Heat exchanger device
US4512392A (en) * 1983-01-18 1985-04-23 Ee Dirk Van Heat exchange apparatus
DE3521914A1 (en) * 1984-06-20 1986-01-02 Showa Aluminum Corp., Sakai, Osaka HEAT EXCHANGER IN WING PANEL DESIGN
US4651811A (en) * 1982-02-27 1987-03-24 Kraftanlagen Ag Heat exchanging body
US4744414A (en) * 1986-09-02 1988-05-17 Arco Chemical Company Plastic film plate-type heat exchanger
US4771826A (en) * 1985-04-23 1988-09-20 Institut Francais Du Petrole Heat exchange device useful more particularly for heat exchanges between gases
US4834930A (en) * 1986-04-28 1989-05-30 Akzo N.V. Method for the manufacture of apparatus for the transfer of heat and/or mass
US4867233A (en) * 1986-04-28 1989-09-19 Akzo N.V. Heat exchanger and method of making heat exchangers
US4955435A (en) * 1987-04-08 1990-09-11 Du Pont Canada, Inc. Heat exchanger fabricated from polymer compositions
US5159529A (en) * 1991-05-15 1992-10-27 International Business Machines Corporation Composite liquid cooled plate for electronic equipment
WO1999066282A1 (en) * 1998-06-18 1999-12-23 3M Innovative Properties Company Microchanneled heat exchanger
US6290685B1 (en) 1998-06-18 2001-09-18 3M Innovative Properties Company Microchanneled active fluid transport devices
US6375871B1 (en) 1998-06-18 2002-04-23 3M Innovative Properties Company Methods of manufacturing microfluidic articles
US6420622B1 (en) 1997-08-01 2002-07-16 3M Innovative Properties Company Medical article having fluid control film
US6431695B1 (en) 1998-06-18 2002-08-13 3M Innovative Properties Company Microstructure liquid dispenser
US6454839B1 (en) 1999-10-19 2002-09-24 3M Innovative Properties Company Electrofiltration apparatus
US6514412B1 (en) 1998-06-18 2003-02-04 3M Innovative Properties Company Microstructured separation device
US6524488B1 (en) 1998-06-18 2003-02-25 3M Innovative Properties Company Method of filtering certain particles from a fluid using a depth loading filtration media
US6983788B2 (en) * 1998-11-09 2006-01-10 Building Performance Equipment, Inc. Ventilating system, heat exchanger and methods
US7223364B1 (en) 1999-07-07 2007-05-29 3M Innovative Properties Company Detection article having fluid control film
US8162042B2 (en) 2007-01-22 2012-04-24 Building Performance Equipment, Inc. Energy recovery ventilator with condensate feedback
CN101650141B (en) * 2009-09-03 2012-06-20 天津大学 Core body of flat-plate heat exchanger for fresh air ventilator
WO2014138860A1 (en) 2013-03-14 2014-09-18 Venmar Ces, Inc. Membrane-integrated energy exchange assembly
US9810439B2 (en) 2011-09-02 2017-11-07 Nortek Air Solutions Canada, Inc. Energy exchange system for conditioning air in an enclosed structure
US9816760B2 (en) 2012-08-24 2017-11-14 Nortek Air Solutions Canada, Inc. Liquid panel assembly
US9909768B2 (en) 2013-03-13 2018-03-06 Nortek Air Solutions Canada, Inc. Variable desiccant control energy exchange system and method
US9920960B2 (en) 2011-01-19 2018-03-20 Nortek Air Solutions Canada, Inc. Heat pump system having a pre-processing module
US10302317B2 (en) 2010-06-24 2019-05-28 Nortek Air Solutions Canada, Inc. Liquid-to-air membrane energy exchanger
US10584884B2 (en) 2013-03-15 2020-03-10 Nortek Air Solutions Canada, Inc. Control system and method for a liquid desiccant air delivery system
US10634392B2 (en) 2013-03-13 2020-04-28 Nortek Air Solutions Canada, Inc. Heat pump defrosting system and method
US10712024B2 (en) 2014-08-19 2020-07-14 Nortek Air Solutions Canada, Inc. Liquid to air membrane energy exchangers
US10782045B2 (en) 2015-05-15 2020-09-22 Nortek Air Solutions Canada, Inc. Systems and methods for managing conditions in enclosed space
US10808951B2 (en) 2015-05-15 2020-10-20 Nortek Air Solutions Canada, Inc. Systems and methods for providing cooling to a heat load
US10962252B2 (en) 2015-06-26 2021-03-30 Nortek Air Solutions Canada, Inc. Three-fluid liquid to air membrane energy exchanger
US11079186B2 (en) 2016-03-31 2021-08-03 Alfa Laval Corporate Ab Heat exchanger with sets of channels forming checkered pattern
US11092349B2 (en) 2015-05-15 2021-08-17 Nortek Air Solutions Canada, Inc. Systems and methods for providing cooling to a heat load
US11408681B2 (en) 2013-03-15 2022-08-09 Nortek Air Solations Canada, Iac. Evaporative cooling system with liquid-to-air membrane energy exchanger
US11892193B2 (en) 2017-04-18 2024-02-06 Nortek Air Solutions Canada, Inc. Desiccant enhanced evaporative cooling systems and methods

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7203268A (en) * 1972-03-11 1973-09-13
DE2518683C3 (en) * 1975-04-26 1981-04-09 4P Verpackungen Gmbh, 8960 Kempten Heat exchanger made from two aluminum sheets connected to one another
DE2606612A1 (en) * 1976-02-19 1977-08-25 Basf Ag PROCESS AND DEVICE FOR THE REMOVAL OF VAPORABLE COMPONENTS FROM HIGHLY VISCOSE SOLUTIONS OR MELTS OF THERMOPLASTIC PLASTICS
CA1121332A (en) * 1978-09-01 1982-04-06 Joseph J. Cleveland Ceramic heat recuperative structure and assembly
DE2921770C2 (en) * 1979-05-29 1983-12-01 Albert 5165 Hürtgenwald Feron Heat exchanger
EP0048559A3 (en) * 1980-09-24 1982-08-11 General Electric Company Pile structure and method of making same
FR2500610B1 (en) * 1981-02-25 1986-05-02 Inst Francais Du Petrole PERFORATED PLATE HEAT EXCHANGER
JPS5861797A (en) * 1981-10-09 1983-04-12 株式会社東芝 Dryer
EP0102359B2 (en) * 1982-02-27 1991-11-27 Kraftanlagen AG. Accumulator device for thermal transfer
DE3328548A1 (en) * 1983-08-08 1985-02-21 Kraftanlagen Ag, 6900 Heidelberg STORAGE MATERIAL FOR HEAT TRANSFER
DE3304039A1 (en) * 1982-03-29 1983-10-06 Dieter Isenbuegel Heat exchanger made from parallel plate elements situated at a distance one above another
FR2533021B1 (en) * 1982-09-15 1987-05-22 Comp Generale Electricite PLATE HEAT EXCHANGER
FR2541442B1 (en) * 1983-02-17 1988-07-15 Inst Francais Du Petrole MODULAR STRUCTURE HEAT EXCHANGER AND MANUFACTURING METHOD THEREOF
EP0212878A1 (en) * 1985-08-08 1987-03-04 Heatric Pty. Limited Plate-type cross-flow heat exchanger
USRE33912E (en) * 1988-02-09 1992-05-05 Jones Environics Ltd. Heat exchanger
US4848450A (en) 1988-02-09 1989-07-18 C & J Jones (1985) Limited Heat exchanger
FR2650881B1 (en) * 1989-08-10 1991-12-13 Ciec HEAT EXCHANGER AND BOILER PRODUCED USING SUCH AN EXCHANGER
US5072790A (en) * 1990-07-30 1991-12-17 Jones Environics Ltd. Heat exchanger core construction
US5628363A (en) * 1995-04-13 1997-05-13 Alliedsignal Inc. Composite continuous sheet fin heat exchanger
US5626188A (en) * 1995-04-13 1997-05-06 Alliedsignal Inc. Composite machined fin heat exchanger
US5655600A (en) * 1995-06-05 1997-08-12 Alliedsignal Inc. Composite plate pin or ribbon heat exchanger
BE1011595A3 (en) * 1997-12-09 1999-11-09 Ewa Nova Bvba Besloten Vennoot Improved heat exchanger and method to realise such a heat exchanger
JP3583637B2 (en) 1999-01-29 2004-11-04 シャープ株式会社 Regenerator for Stirling engine
DE10042690A1 (en) * 2000-08-31 2002-03-14 Behr Gmbh & Co Bed heat exchanger
US20110146226A1 (en) * 2008-12-31 2011-06-23 Frontline Aerospace, Inc. Recuperator for gas turbine engines
FR3121653A1 (en) 2021-04-08 2022-10-14 Psa Automobiles Sa AWNING GRID WITH FLOW LOCKING

Cited By (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303125A (en) * 1979-04-26 1981-12-01 Vahlbrauk Karl Heinz Heat exchange structural element
US4475589A (en) * 1981-01-21 1984-10-09 Tokyo Shibaura Denki Kabushiki Kaisha Heat exchanger device
US4651811A (en) * 1982-02-27 1987-03-24 Kraftanlagen Ag Heat exchanging body
US4512392A (en) * 1983-01-18 1985-04-23 Ee Dirk Van Heat exchange apparatus
DE3521914A1 (en) * 1984-06-20 1986-01-02 Showa Aluminum Corp., Sakai, Osaka HEAT EXCHANGER IN WING PANEL DESIGN
US4771826A (en) * 1985-04-23 1988-09-20 Institut Francais Du Petrole Heat exchange device useful more particularly for heat exchanges between gases
US4834930A (en) * 1986-04-28 1989-05-30 Akzo N.V. Method for the manufacture of apparatus for the transfer of heat and/or mass
US4867233A (en) * 1986-04-28 1989-09-19 Akzo N.V. Heat exchanger and method of making heat exchangers
US4744414A (en) * 1986-09-02 1988-05-17 Arco Chemical Company Plastic film plate-type heat exchanger
US4955435A (en) * 1987-04-08 1990-09-11 Du Pont Canada, Inc. Heat exchanger fabricated from polymer compositions
US5159529A (en) * 1991-05-15 1992-10-27 International Business Machines Corporation Composite liquid cooled plate for electronic equipment
US7910790B2 (en) 1997-08-01 2011-03-22 3M Innovative Properties Company Medical article having fluid control film
US7781639B2 (en) 1997-08-01 2010-08-24 3M Innovative Properties Company Medical article having fluid control film
US6420622B1 (en) 1997-08-01 2002-07-16 3M Innovative Properties Company Medical article having fluid control film
US6381846B2 (en) 1998-06-18 2002-05-07 3M Innovative Properties Company Microchanneled active fluid heat exchanger method
WO1999066282A1 (en) * 1998-06-18 1999-12-23 3M Innovative Properties Company Microchanneled heat exchanger
US6375871B1 (en) 1998-06-18 2002-04-23 3M Innovative Properties Company Methods of manufacturing microfluidic articles
US6431695B1 (en) 1998-06-18 2002-08-13 3M Innovative Properties Company Microstructure liquid dispenser
AU750275B2 (en) * 1998-06-18 2002-07-11 3M Innovative Properties Company Microchanneled heat exchanger
US6290685B1 (en) 1998-06-18 2001-09-18 3M Innovative Properties Company Microchanneled active fluid transport devices
US6514412B1 (en) 1998-06-18 2003-02-04 3M Innovative Properties Company Microstructured separation device
US6524488B1 (en) 1998-06-18 2003-02-25 3M Innovative Properties Company Method of filtering certain particles from a fluid using a depth loading filtration media
US6761962B2 (en) 1998-06-18 2004-07-13 3M Innovative Properties Company Microfluidic articles
US6867342B2 (en) 1998-06-18 2005-03-15 3M Innovative Properties Company Drug delivery dressing having fluid control film
US6907921B2 (en) 1998-06-18 2005-06-21 3M Innovative Properties Company Microchanneled active fluid heat exchanger
US6983788B2 (en) * 1998-11-09 2006-01-10 Building Performance Equipment, Inc. Ventilating system, heat exchanger and methods
US7334629B2 (en) 1998-11-09 2008-02-26 Building Performance Equipment Ventilating system, heat exchanger and methods
US7640662B2 (en) 1998-11-09 2010-01-05 Building Performance Equipment, Inc. Method of making heat exchangers
US7223364B1 (en) 1999-07-07 2007-05-29 3M Innovative Properties Company Detection article having fluid control film
US8197775B2 (en) 1999-07-07 2012-06-12 3M Innovative Properties Company Detection article having fluid control film
US6471746B2 (en) 1999-10-19 2002-10-29 3M Innovative Properties Company Electrofiltration process
US6454839B1 (en) 1999-10-19 2002-09-24 3M Innovative Properties Company Electrofiltration apparatus
US8162042B2 (en) 2007-01-22 2012-04-24 Building Performance Equipment, Inc. Energy recovery ventilator with condensate feedback
CN101650141B (en) * 2009-09-03 2012-06-20 天津大学 Core body of flat-plate heat exchanger for fresh air ventilator
US12111072B2 (en) 2010-06-24 2024-10-08 Nortek Air Solutions Canada, Inc. Liquid-to-air membrane energy exchanger
US10302317B2 (en) 2010-06-24 2019-05-28 Nortek Air Solutions Canada, Inc. Liquid-to-air membrane energy exchanger
US9920960B2 (en) 2011-01-19 2018-03-20 Nortek Air Solutions Canada, Inc. Heat pump system having a pre-processing module
US10928082B2 (en) 2011-09-02 2021-02-23 Nortek Air Solutions Canada, Inc. Energy exchange system for conditioning air in an enclosed structure
US9810439B2 (en) 2011-09-02 2017-11-07 Nortek Air Solutions Canada, Inc. Energy exchange system for conditioning air in an enclosed structure
US11761645B2 (en) 2011-09-02 2023-09-19 Nortek Air Solutions Canada, Inc. Energy exchange system for conditioning air in an enclosed structure
US11732972B2 (en) 2012-08-24 2023-08-22 Nortek Air Solutions Canada, Inc. Liquid panel assembly
US9816760B2 (en) 2012-08-24 2017-11-14 Nortek Air Solutions Canada, Inc. Liquid panel assembly
US11035618B2 (en) 2012-08-24 2021-06-15 Nortek Air Solutions Canada, Inc. Liquid panel assembly
US9909768B2 (en) 2013-03-13 2018-03-06 Nortek Air Solutions Canada, Inc. Variable desiccant control energy exchange system and method
US10480801B2 (en) 2013-03-13 2019-11-19 Nortek Air Solutions Canada, Inc. Variable desiccant control energy exchange system and method
US10634392B2 (en) 2013-03-13 2020-04-28 Nortek Air Solutions Canada, Inc. Heat pump defrosting system and method
US11300364B2 (en) 2013-03-14 2022-04-12 Nortek Air Solutions Canada, Ine. Membrane-integrated energy exchange assembly
US10352628B2 (en) 2013-03-14 2019-07-16 Nortek Air Solutions Canada, Inc. Membrane-integrated energy exchange assembly
EP3730892A1 (en) * 2013-03-14 2020-10-28 Nortek Air Solutions Canada, Inc. Membrane-integrated energy exchange assembly
WO2014138860A1 (en) 2013-03-14 2014-09-18 Venmar Ces, Inc. Membrane-integrated energy exchange assembly
EP2972046A4 (en) * 2013-03-14 2016-11-30 Nortek Air Solutions Canada Inc Membrane-integrated energy exchange assembly
US10584884B2 (en) 2013-03-15 2020-03-10 Nortek Air Solutions Canada, Inc. Control system and method for a liquid desiccant air delivery system
US11408681B2 (en) 2013-03-15 2022-08-09 Nortek Air Solations Canada, Iac. Evaporative cooling system with liquid-to-air membrane energy exchanger
US11598534B2 (en) 2013-03-15 2023-03-07 Nortek Air Solutions Canada, Inc. Control system and method for a liquid desiccant air delivery system
US10712024B2 (en) 2014-08-19 2020-07-14 Nortek Air Solutions Canada, Inc. Liquid to air membrane energy exchangers
US11092349B2 (en) 2015-05-15 2021-08-17 Nortek Air Solutions Canada, Inc. Systems and methods for providing cooling to a heat load
US11143430B2 (en) 2015-05-15 2021-10-12 Nortek Air Solutions Canada, Inc. Using liquid to air membrane energy exchanger for liquid cooling
US10808951B2 (en) 2015-05-15 2020-10-20 Nortek Air Solutions Canada, Inc. Systems and methods for providing cooling to a heat load
US11815283B2 (en) 2015-05-15 2023-11-14 Nortek Air Solutions Canada, Inc. Using liquid to air membrane energy exchanger for liquid cooling
US10782045B2 (en) 2015-05-15 2020-09-22 Nortek Air Solutions Canada, Inc. Systems and methods for managing conditions in enclosed space
US10962252B2 (en) 2015-06-26 2021-03-30 Nortek Air Solutions Canada, Inc. Three-fluid liquid to air membrane energy exchanger
US11079186B2 (en) 2016-03-31 2021-08-03 Alfa Laval Corporate Ab Heat exchanger with sets of channels forming checkered pattern
US11892193B2 (en) 2017-04-18 2024-02-06 Nortek Air Solutions Canada, Inc. Desiccant enhanced evaporative cooling systems and methods

Also Published As

Publication number Publication date
FR2103583A1 (en) 1972-04-14
DE2143020A1 (en) 1972-03-02
UST911013I4 (en) 1973-06-26

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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