GB1329000A - Lubricating composition including block copolymers as viscosity index improvers - Google Patents

Lubricating composition including block copolymers as viscosity index improvers

Info

Publication number
GB1329000A
GB1329000A GB5861870A GB5861870A GB1329000A GB 1329000 A GB1329000 A GB 1329000A GB 5861870 A GB5861870 A GB 5861870A GB 5861870 A GB5861870 A GB 5861870A GB 1329000 A GB1329000 A GB 1329000A
Authority
GB
United Kingdom
Prior art keywords
blocks
polyvinylcyclohexane
polymer
block copolymers
composition including
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
GB5861870A
Other languages
English (en)
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.)
Shell Internationale Research Maatschappij BV
Original Assignee
Shell Internationale Research Maatschappij BV
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 Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Publication of GB1329000A publication Critical patent/GB1329000A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M1/00—Liquid compositions essentially based on mineral lubricating oils or fatty oils; Their use as lubricants
    • C10M1/08—Liquid compositions essentially based on mineral lubricating oils or fatty oils; Their use as lubricants with additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/04—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing aromatic monomers, e.g. styrene
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/06—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing conjugated dienes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
    • C10M2207/046—Hydroxy ethers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/34—Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/086—Imides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/28—Amides; Imides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2217/028—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a nitrogen-containing hetero ring
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/04—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/06—Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/046—Overbasedsulfonic acid salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/045—Metal containing thio derivatives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/02—Unspecified siloxanes; Silicones
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/05—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/08—Hydraulic fluids, e.g. brake-fluids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
GB5861870A 1969-12-12 1970-12-10 Lubricating composition including block copolymers as viscosity index improvers Expired GB1329000A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88472069A 1969-12-12 1969-12-12

Publications (1)

Publication Number Publication Date
GB1329000A true GB1329000A (en) 1973-09-05

Family

ID=25385236

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5861870A Expired GB1329000A (en) 1969-12-12 1970-12-10 Lubricating composition including block copolymers as viscosity index improvers

Country Status (10)

Country Link
US (1) US3668125A (ja)
JP (1) JPS4937564B1 (ja)
BE (1) BE759715A (ja)
CA (1) CA923112A (ja)
DE (1) DE2060864A1 (ja)
FR (1) FR2070827B1 (ja)
GB (1) GB1329000A (ja)
NL (1) NL7018019A (ja)
SE (1) SE368025B (ja)
ZA (1) ZA708338B (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4162985A (en) * 1973-10-01 1979-07-31 The Lubrizol Corporation Multigrade lubricants containing interpolymers
DK151035B (da) * 1976-02-10 1987-10-12 Shell Int Research Hydrogeneret stjerneformet polymer til brug som smoereolieadditiv, fremgangsmaade til fremstilling deraf og smoereoliepraeparat indeholdende en saadan polymer

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772196A (en) * 1971-12-03 1973-11-13 Shell Oil Co Lubricating compositions
US4081390A (en) * 1975-05-22 1978-03-28 Orobis Limited Viscosity index improver composition
DE2603034C3 (de) * 1976-01-28 1982-04-15 Basf Ag, 6700 Ludwigshafen Mineralschmierölgemische
US4156673A (en) * 1976-02-10 1979-05-29 Shell Oil Company Hydrogenated star-shaped polymer
US4141847A (en) * 1977-05-11 1979-02-27 Shell Oil Company Star-shaped polymer reacted with dicarboxylic acid and amine as dispersant viscosity index improver
US5272208A (en) * 1981-08-13 1993-12-21 Asahi Kasei Kogyo Kabushiki Kaisha Modified block copolymer composition
US5272209A (en) * 1981-08-13 1993-12-21 Asahi Kasei Kogyo Kabushiki Kaisha Modified block copolymer composition
EP0371001B1 (en) * 1981-08-13 1996-02-07 Asahi Kasei Kogyo Kabushiki Kaisha A modified block copolymer
US5278246A (en) * 1981-08-13 1994-01-11 Asahi Kasei Kogyo Kabushiki Kaisha Modified block copolymer and a process for producing the same
US4728578A (en) * 1986-08-13 1988-03-01 The Lubrizol Corporation Compositions containing basic metal salts and/or non-Newtonian colloidal disperse systems and vinyl aromatic containing polymers
US4849481A (en) * 1987-07-10 1989-07-18 Shell Oil Company Star shaped asymmetric block copolymer of monoalkenyl aromatic hydrocarbon and conjugated diene
US4900875A (en) * 1987-07-10 1990-02-13 Shell Oil Company Polymeric viscosity index additive and oil composition comprising the same
US4992529A (en) * 1987-10-29 1991-02-12 Shell Oil Company Method for separating metal contaminants from organic polymers
US4788361A (en) * 1987-10-30 1988-11-29 Shell Oil Company Polymeric viscosity index improver and oil composition comprising the same
US4877836A (en) * 1988-05-24 1989-10-31 Shell Oil Company Viscosity index improver and composition containing same
US5078893A (en) 1988-06-24 1992-01-07 Exxon Chemical Patents Inc. Synergistic combination of additives useful in power transmitting compositions
US5185090A (en) 1988-06-24 1993-02-09 Exxon Chemical Patents Inc. Low pressure derived mixed phosphorous- and sulfur-containing reaction products useful in power transmitting compositions and process for preparing same
US5262508A (en) * 1990-10-10 1993-11-16 Exxon Chemical Patents Inc. Process for preparing alkyl phenol-sulfur condensate lubricating oil additives
US5118875A (en) * 1990-10-10 1992-06-02 Exxon Chemical Patents Inc. Method of preparing alkyl phenol-formaldehyde condensates
US5209862A (en) * 1991-01-30 1993-05-11 Shell Oil Company Vi improver and composition containing same
US5310490A (en) * 1991-03-13 1994-05-10 Exxon Chemical Products Inc. Viscosity modifer polymers
US5310814A (en) * 1991-03-15 1994-05-10 Exxon Chemical Patents Inc. Viscosity modifier polybutadiene polymers
US6077455A (en) 1995-07-17 2000-06-20 Exxon Chemical Patents Inc Automatic transmission fluid of improved viscometric properties
US7407918B2 (en) * 2003-12-11 2008-08-05 Afton Chemical Corporation Lubricating oil compositions
JP4361516B2 (ja) * 2005-06-10 2009-11-11 キヤノンマシナリー株式会社 ウェーハ分割方法
US20070105731A1 (en) * 2005-11-04 2007-05-10 Chin Chu Lubricating oil compositions
US8703666B2 (en) * 2012-06-01 2014-04-22 Exxonmobil Research And Engineering Company Lubricant compositions and processes for preparing same
US11078437B2 (en) 2014-04-17 2021-08-03 Eni S.P.A. Hydrogenated polymers with a radial structure having a core based on calixarenes and use thereof in lubricant compositions
MX2016013535A (es) 2014-04-17 2017-03-06 Eni Spa Polimeros hidrogenados con una estructura radial que tiene un núcleo basado en calixarenos y uso de los mismos en composiciones lubricantes.
IT201900013836A1 (it) 2019-08-02 2021-02-02 Eni Spa Copolimeri lipofili comprendenti multi-blocchi polari, procedimento per la loro preparazione e loro utilizzo in composizioni lubrificanti.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2478843A (en) * 1946-02-26 1949-08-09 Monsanto Chemicals Mineral oil composition
US2798853A (en) * 1954-05-27 1957-07-09 Exxon Research Engineering Co Lubricant containing hydrogenated liquid polymer oils
US3060120A (en) * 1956-02-23 1962-10-23 Exxon Research Engineering Co Lubricating oil compositions
US3333024A (en) * 1963-04-25 1967-07-25 Shell Oil Co Block polymers, compositions containing them and process of their preparation
FR1405878A (fr) * 1963-05-28 1965-07-16 Princeton Chemical Res Produits destinés à améliorer l'indice de viscosité des huiles lubrifiantes
GB1052700A (ja) * 1963-12-09 1900-01-01
FR1444737A (fr) * 1964-03-23 1966-07-08 Shell Int Research Copolymères hydrogénés à base d'éthylène

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4162985A (en) * 1973-10-01 1979-07-31 The Lubrizol Corporation Multigrade lubricants containing interpolymers
DK151035B (da) * 1976-02-10 1987-10-12 Shell Int Research Hydrogeneret stjerneformet polymer til brug som smoereolieadditiv, fremgangsmaade til fremstilling deraf og smoereoliepraeparat indeholdende en saadan polymer

Also Published As

Publication number Publication date
FR2070827B1 (ja) 1973-04-27
JPS4937564B1 (ja) 1974-10-09
US3668125A (en) 1972-06-06
DE2060864A1 (de) 1971-06-24
CA923112A (en) 1973-03-20
BE759715A (nl) 1971-06-02
FR2070827A1 (ja) 1971-09-17
SE368025B (ja) 1974-06-17
NL7018019A (ja) 1971-06-15
ZA708338B (en) 1971-09-29

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PCNP Patent ceased through non-payment of renewal fee