FR2160057A5 - - Google Patents

Info

Publication number
FR2160057A5
FR2160057A5 FR7239330A FR7239330A FR2160057A5 FR 2160057 A5 FR2160057 A5 FR 2160057A5 FR 7239330 A FR7239330 A FR 7239330A FR 7239330 A FR7239330 A FR 7239330A FR 2160057 A5 FR2160057 A5 FR 2160057A5
Authority
FR
France
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
FR7239330A
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.)
Engelhard Minerals and Chemicals Corp
Original Assignee
Engelhard Minerals and Chemicals 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 Engelhard Minerals and Chemicals Corp filed Critical Engelhard Minerals and Chemicals Corp
Application granted granted Critical
Publication of FR2160057A5 publication Critical patent/FR2160057A5/fr
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Catalysts (AREA)
FR7239330A 1971-11-10 1972-11-07 Expired FR2160057A5 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19734871A 1971-11-10 1971-11-10

Publications (1)

Publication Number Publication Date
FR2160057A5 true FR2160057A5 (fr) 1973-06-22

Family

ID=22729035

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7239330A Expired FR2160057A5 (fr) 1971-11-10 1972-11-07

Country Status (7)

Country Link
US (1) US3791143A (fr)
JP (1) JPS4858215A (fr)
CA (1) CA981424A (fr)
DE (1) DE2254895A1 (fr)
FR (1) FR2160057A5 (fr)
GB (1) GB1415847A (fr)
SE (1) SE381706B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2367188A1 (fr) * 1976-10-07 1978-05-05 Engelhard Min & Chem Procede de traitement catalytique des gaz d'echappement des moteurs a combustion interne a deux temps
FR2460709A1 (fr) * 1979-07-09 1981-01-30 Renault Dispositif de protection de reacteurs catalytiques

Families Citing this family (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5225884B2 (fr) * 1971-12-29 1977-07-11
US3930789A (en) * 1973-03-06 1976-01-06 J. Eberspacher Device for preheating waste gases of an exhaust conduit
GB1519343A (en) * 1974-09-03 1978-07-26 Matsushita Electric Ind Co Ltd Gas purifying devices
JPS5523332B2 (fr) * 1975-02-06 1980-06-23
DE2542997C2 (de) * 1975-09-26 1982-11-11 Siemens AG, 1000 Berlin und 8000 München Verfahren und Vorrichtung zum Starten eines Gasgenerators zur Umsetzung von Kohlenwasserstoffen in ein Brenngas und einer mit dem Brenngas zu speisenden Brennkraftmaschine
US3984975A (en) * 1975-11-10 1976-10-12 General Motors Corporation Internal combustion engine exhaust emission control
JPS5479319A (en) * 1977-12-05 1979-06-25 Nissan Motor Co Ltd Device of warming up catalyst for automobile
JPS555466A (en) * 1978-06-27 1980-01-16 Shimizu Constr Co Ltd Exhaust gas purifier for diesel engine
DE3115739A1 (de) * 1981-04-18 1982-11-04 Daimler-Benz Ag, 7000 Stuttgart "abgasleitungsanlage fuer eine mehrzylindrige brennkraftmaschine"
US4737345A (en) * 1981-04-20 1988-04-12 Werner Henke System for efficiently removing oxides of nitrogen from exhaust gas
FR2548264B1 (fr) * 1983-06-16 1985-12-13 Renault Regeneration des filtres a particules, notamment pour moteurs diesel
GB2161397A (en) * 1984-07-11 1986-01-15 Michael George Berry Exhaust catalytic combustor
JPH0615016B2 (ja) * 1988-09-09 1994-03-02 トヨタ自動車株式会社 自動車排気ガス浄化装置
DE3912915C1 (fr) * 1989-04-20 1990-12-13 Degussa Ag, 6000 Frankfurt, De
DE3918601A1 (de) * 1989-06-07 1990-12-13 Schatz Oskar Verfahren und vorrichtung zur behandlung der abgase von verbrennungsmotoren
JPH03141816A (ja) * 1989-10-27 1991-06-17 Toyota Motor Corp 排気ガス浄化装置
US5250268A (en) * 1990-03-09 1993-10-05 Volkswagen Ag Catalytic cleaning arrangement for exhaust from an internal combustion engine
DE4117364A1 (de) * 1991-05-28 1992-12-03 Duerrwaechter E Dr Doduco Verfahren zum verkuerzen der anspringverzoegerung eines katalysators und vorrichtung zur durchfuehrung des verfahrens
US5577383A (en) * 1991-09-20 1996-11-26 Hitachi, Ltd. Apparatus for controlling internal combustion engine
JP2601072B2 (ja) * 1991-09-20 1997-04-16 株式会社日立製作所 内燃機関とその運転方法および自動車
DE4236271C2 (de) * 1991-10-28 1994-09-22 Toyota Motor Co Ltd Abgasemissionssteuervorrichtung unter Einsatz eines katalytischen Konverters mit einem Kohlenwasserstoffadsorptionsmittel
JP2659504B2 (ja) * 1991-12-26 1997-09-30 大阪瓦斯株式会社 触媒燃焼装置
JPH06101463A (ja) * 1992-09-24 1994-04-12 Fuji Heavy Ind Ltd エンジンの排気ガス浄化装置
US5738832A (en) * 1993-02-15 1998-04-14 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Exhaust gas purifying apparatus
IT1261727B (it) * 1993-03-17 1996-05-30 Pierburg Gmbh Dispositivo di riscaldamento del catalizzatore per motori a combustione interna con un sistema a bruciatore.
US5419121A (en) * 1993-04-16 1995-05-30 Engelhard Corporation Method and apparatus for reduction of pollutants emitted from automotive engines by flame incineration
US5377486A (en) * 1993-05-17 1995-01-03 Ford Motor Company Catalytic converter system
AU690568B2 (en) * 1993-07-16 1998-04-30 Thermatrix Inc. Method and afterburner apparatus for control of highly variable flows
US5480622A (en) * 1994-07-05 1996-01-02 Ford Motor Company Electrically heatable catalyst device using electrically conductive non-metallic materials
US6000217A (en) * 1995-01-04 1999-12-14 Engelhard Corporation Air injection strategies for effectively burning hydrocarbons released from a hydrocarbon trap
DE19644407C2 (de) * 1996-10-25 1999-09-23 Daimler Chrysler Ag Verfahren zur Reduzierung der Emissionen einer Brennkraftmaschine
JP3237611B2 (ja) * 1997-11-11 2001-12-10 トヨタ自動車株式会社 内燃機関の排気浄化装置
US6258330B1 (en) * 1998-11-10 2001-07-10 International Fuel Cells, Llc Inhibition of carbon deposition on fuel gas steam reformer walls
DE10038724A1 (de) 2000-08-09 2002-02-21 Porsche Ag Verfahren und Vorrichtung zur katalytischen Abgasnachbehandlung des Abgases einer Brennkraftmaschine
ATE258821T1 (de) 2000-08-16 2004-02-15 Umicore Ag & Co Kg Abgasreinigungskatalysator für motornahen einsatz und verfahren zu seiner herstellung
JP2002349241A (ja) * 2001-05-24 2002-12-04 Isuzu Motors Ltd ディーゼルエンジンの排気浄化装置
JP3840923B2 (ja) * 2001-06-20 2006-11-01 いすゞ自動車株式会社 ディーゼルエンジンの排気浄化装置
JP3876705B2 (ja) * 2001-12-13 2007-02-07 いすゞ自動車株式会社 ディーゼルエンジンの排気ガス浄化システム
JP3951899B2 (ja) * 2002-11-15 2007-08-01 いすゞ自動車株式会社 ディーゼルエンジンの排気浄化装置
AU2003200843B2 (en) * 2002-12-11 2009-05-21 Clean Air Power, Inc. Catalyst heat retention system for multi-fuel engine
JP2006274838A (ja) * 2005-03-28 2006-10-12 Toyota Motor Corp 内燃機関の排気浄化システム
US7308788B1 (en) 2006-09-29 2007-12-18 International Engine Intellectual Property Company, Llc Engine and method for counteracting face plugging of a diesel oxidation catalyst
WO2008135805A1 (fr) * 2007-05-02 2008-11-13 Perkins Engines Company Limited Système de traitement d'évacuation mettant en œuvre une dérivation doc sélective
US20080295499A1 (en) * 2007-05-31 2008-12-04 James Joshua Driscoll Exhaust system utilizing a low-temperature oxidation catalyst
US8166751B2 (en) * 2007-07-31 2012-05-01 Caterpillar Inc. Particulate filter
US7799289B2 (en) * 2007-07-31 2010-09-21 Caterpillar Inc Exhaust treatment system with NO2 control
US20090035194A1 (en) * 2007-07-31 2009-02-05 Caterpillar Inc. Exhaust treatment system with an oxidation device for NO2 control
DE102007053932A1 (de) * 2007-11-13 2009-05-14 Bayerische Motoren Werke Aktiengesellschaft Abgasanlage und Verfahren zum Betreiben derselben
US8151558B2 (en) * 2008-01-31 2012-04-10 Caterpillar Inc. Exhaust system implementing SCR and EGR
US20090241541A1 (en) * 2008-03-25 2009-10-01 International Truck Intellectual Property Company, Llc Pre-turbo exahust filtration system for internal combustion engines
JP4569690B2 (ja) * 2008-09-04 2010-10-27 トヨタ自動車株式会社 内燃機関の排気浄化装置
US8828342B1 (en) * 2013-10-10 2014-09-09 International Engine Intellectual Property Company, Llc DPF energy conservation
EP2865858B1 (fr) * 2013-10-24 2019-05-15 Bosal Emission Control Systems NV Système et procédé pour le traitement de gaz d'échappement
EP3947932A2 (fr) * 2019-03-25 2022-02-09 TVS Motor Company Limited Moteur thermique et véhicule motorisé associé

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053380A (fr) * 1962-10-06
FR1413228A (fr) * 1963-09-26 1965-10-08 Oxy Catalyst Inc Appareil pour améliorer l'épuration des gaz d'échappement d'un moteur à explosions
GB1031775A (en) * 1962-10-06 1966-06-02 Peter Spence & Sons Ltd Improvements in and relating to catalysts
US3440817A (en) * 1963-09-07 1969-04-29 Daimler Benz Ag Catalytic converter system for exhaust gases of internal combustion engines

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071449A (en) * 1960-10-03 1963-01-01 Stanley B Shustack Apparatus for catalytic treatment of internal combustion engine exhaust gases
DE1198128B (de) * 1961-06-28 1965-08-05 Eberspaecher J Temperatur-Regelanordnung fuer Katalysatoren in Kraftfahrzeugabgasanlagen
FR1308736A (fr) * 1961-09-29 1962-11-09 Comp Generale Electricite Dispositif de commande de l'épurateur des gaz d'échappement d'un moteur
US3203168A (en) * 1962-05-21 1965-08-31 Oxy Catalyst Inc Method and apparatus for improving the purification of exhaust gases from an internal combustion engine
US3273971A (en) * 1963-09-26 1966-09-20 Oxy Catalyst Inc Apparatus for improving the purification of exhaust gases from an internal combustion engine
US3306035A (en) * 1966-02-11 1967-02-28 Jacque C Morrell Apparatus for treatment of exhaust gases from internal combustion engines
GB1123998A (en) * 1966-04-27 1968-08-14 Stuart Garfield Hilborn Fuel injection system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053380A (fr) * 1962-10-06
GB1031775A (en) * 1962-10-06 1966-06-02 Peter Spence & Sons Ltd Improvements in and relating to catalysts
US3440817A (en) * 1963-09-07 1969-04-29 Daimler Benz Ag Catalytic converter system for exhaust gases of internal combustion engines
FR1413228A (fr) * 1963-09-26 1965-10-08 Oxy Catalyst Inc Appareil pour améliorer l'épuration des gaz d'échappement d'un moteur à explosions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2367188A1 (fr) * 1976-10-07 1978-05-05 Engelhard Min & Chem Procede de traitement catalytique des gaz d'echappement des moteurs a combustion interne a deux temps
FR2460709A1 (fr) * 1979-07-09 1981-01-30 Renault Dispositif de protection de reacteurs catalytiques

Also Published As

Publication number Publication date
US3791143A (en) 1974-02-12
CA981424A (en) 1976-01-13
DE2254895A1 (de) 1973-05-17
JPS4858215A (fr) 1973-08-15
GB1415847A (en) 1975-12-10
SE381706B (sv) 1975-12-15

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