EP0403648A1 - Liquide lubrifiant inflammable - Google Patents

Liquide lubrifiant inflammable Download PDF

Info

Publication number
EP0403648A1
EP0403648A1 EP89901346A EP89901346A EP0403648A1 EP 0403648 A1 EP0403648 A1 EP 0403648A1 EP 89901346 A EP89901346 A EP 89901346A EP 89901346 A EP89901346 A EP 89901346A EP 0403648 A1 EP0403648 A1 EP 0403648A1
Authority
EP
European Patent Office
Prior art keywords
incombustible
polyacrylamide
lubricant
triethanolamine
water
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.)
Withdrawn
Application number
EP89901346A
Other languages
German (de)
English (en)
Other versions
EP0403648A4 (fr
Inventor
Vadim Anatolievich Sirotenko
Eleonora Vladimirovna Degtyareva
Yakov Moiseevich Grinberg
Efim Isaakovich Zaretsky
Vadim Lvovich Yasnogorodsky
Andrei Mefodievich Khanin
Anatoly Dmitrievich Kantemir
Vladimir Nikolaevich Tuz
Lidia Petrovna Serezhkina
Alla Ivanovna Gnilitskaya
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.)
KHARKOVSKY AVTOMOBILNO-DOROZHNY INSTITUT IMENI KOMSOMOLA UKRAINY
PROIZVODSTVENNOE OBIEDINENIE ATOMNOGO TURBOSTROENIA KHARKOVSKY TURBINNY ZAVOD IMENI S M KIROVA
Original Assignee
KHARKOVSKY AVTOMOBILNO-DOROZHNY INSTITUT IMENI KOMSOMOLA UKRAINY
PROIZVODSTVENNOE OBIEDINENIE ATOMNOGO TURBOSTROENIA KHARKOVSKY TURBINNY ZAVOD IMENI S M KIROVA
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 KHARKOVSKY AVTOMOBILNO-DOROZHNY INSTITUT IMENI KOMSOMOLA UKRAINY, PROIZVODSTVENNOE OBIEDINENIE ATOMNOGO TURBOSTROENIA KHARKOVSKY TURBINNY ZAVOD IMENI S M KIROVA filed Critical KHARKOVSKY AVTOMOBILNO-DOROZHNY INSTITUT IMENI KOMSOMOLA UKRAINY
Publication of EP0403648A4 publication Critical patent/EP0403648A4/fr
Publication of EP0403648A1 publication Critical patent/EP0403648A1/fr
Withdrawn legal-status Critical Current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
    • C10M173/00—Lubricating compositions containing more than 10% water
    • C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
    • 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
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/20—Compounds containing nitrogen
    • 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
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/04—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M133/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M133/08—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups
    • 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
    • C10M149/00—Lubricating compositions characterised by the additive being a macromolecular compound containing nitrogen
    • C10M149/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M149/06—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an amido or imido group
    • 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/02—Water
    • 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/08—Inorganic acids or salts thereof
    • C10M2201/082—Inorganic acids or salts thereof containing nitrogen
    • 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/08—Inorganic acids or salts thereof
    • C10M2201/082—Inorganic acids or salts thereof containing nitrogen
    • C10M2201/083—Inorganic acids or salts thereof containing nitrogen nitrites
    • 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
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2215/042—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Alkoxylated derivatives thereof
    • 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
    • C10M2217/024—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an amido or imido group
    • 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
    • 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
    • C10N2050/01—Emulsions, colloids, or micelles

Definitions

  • the invention relates to the field of lubricants and in particular to an incombustible lubricant.
  • a lubricating fluid is necessary which causes the fluid flow at a certain thickness of the supporting liquid film between the rotating and the immovable part of a bearing, which reduces the friction and the transmission of a hydraulic impulse in hydraulic systems regulating fluid machines.
  • the mineral lubricating oils for turbines have one major disadvantage, they are flammable and can cause fires in power plants.
  • Incombustible water-based lubricants are also well known.
  • water has a low viscosity (1 cSt), which means that the strength of the supporting lubricating film in a hydrodynamic plain bearing is insufficient: for the separation of friction surfaces, which causes their increased wear and tear from destruction.
  • Incombustible lubricants containing water and polyglycols are known ("Ognebtöikie turbinnye masla" - fire-resistant turbine oils - edited by KI Ivanov, 1974, Khimia, (Moscow), pp. 20-22).
  • these liquids do not have a stable viscosity over time at certain temperature values, which cannot guarantee stable operation of turbomachines.
  • the ones used in these lubricating fluids Polyglycols are extremely deficient additives.
  • An incombustible lubricant which contains water and polyacrylamide is also known (SU, A, 168826). This mixture also has a temporally unstable viscosity at certain temperature values and is extremely corrosion-active in relation to unalloyed steel types, main construction materials of turbine bearings, hydraulic systems for regulating turbo machines and other similar systems.
  • the invention has for its object to achieve the increase in the temporal stability of the temperature-viscosity behavior of the liquid while reducing its corrosion activity by introducing new components from which the lubricating fluid is composed and by changing its quantitative ratio.
  • the proposed incombustible creaming liquid which contains polyacrylamide and Nasser additionally contains, according to the invention, triethanolamine and sodium nitrite with the following ratio of the components, mass%:
  • the corrosion rate of the unalloyed steel when exposed to the known incombustible lubricant (SU, A, 168826) and the proposed lubricant, which was measured under the same conditions and at the same concentrations of polyacrylamide (0.4 masae%), is 0.34 respectively . 0.0021 mm / year.
  • the proposed non-flammable lubricant less than the korroaionsmod mentioned known incombustible S c hmierfactkeit.
  • the incombustible creamy liquid according to the invention has an increased temporal stability of the viscosity at certain temperature values compared to the known lubricant (SU, A, 168826).
  • the incombustible lubricating fluid according to the invention ensures reliable operation of turbomachines, it is explosive and fire-hazardous, and no special protective measures for humans are required when it is used.
  • the change in the ratio between the components of the lubricant according to the invention leads to a reduction in the reliable operation of a turbomachine.
  • the registered concentrations of polyacrylamide can be attributed to the fact that it is not possible to reduce the concentration of polyacrylamide below the stated values to achieve the viscosity necessary for the formation of a sufficient thickness of the hydrodynamic lubricating layer. Exceeding the concentration above the registered values leads to a sharp increase in viscosity, which makes the lubricant technologically unusable.
  • the polyacrylamide used in the proposed non-flammable lubricant can be in the form gel (usually at a concentration of 8%) or in the form of a dry powder.
  • the S c inventive hmier hasslekeit Turbomachinery is prepared as follows. Triethanolamine and sodium nitrite are introduced into water, mixed, then polyacrylamide is added and the mixture is mixed until the end product is obtained.
  • the incombustible lubricant according to the invention is composed of the following components in mass%:
  • the proposed incombustible lubricant for a radial bearing with a diameter of 420 mm is produced as follows.
  • test results of the lubricating fluid produced according to the invention which consists in measuring its kinematic viscosity in the operating temperature range of its operation (25, 50, 70 ° C.) after it has passed through a bearing within 10, 20, 30 and 40 days, are in the table below cited.
  • the incombustible lubricant according to the invention is composed of the following components in mass%:
  • the proposed incombustible lubricant is prepared and tested in the same way as in Example 1.
  • the test results are shown in Table 1 below.
  • the incombustible lubricant according to the invention is composed of the following components in mass%:
  • the incombustible lubricating fluid according to the invention is prepared and tested in the same way as in Example 1. The test results are shown in the table below.
  • the non-flammable lubricating fluid according to the invention is composed of the following components in mass%:
  • the proposed invention can be used in the field of lubricants for bearings and hydraulic systems for regulating turbomachines and other similar units.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Lubricants (AREA)

Abstract

Le liquide lubrifiant ininflammable décrit contient du polyacrylamide, de l'eau, ainsi que de la triéthanolamine et du nitrite de sodium selon les rapports suivants entre les composants: 0,3 à 0,6 % en poids de polyacrylamide, 0,8 à 1,5 % en poids de triéthanolamine et 0,1 à 0,3 % en poids de nitrite de sodium, le reste étant composé d'eau.
EP89901346A 1988-07-25 1988-07-25 Liquide lubrifiant inflammable Withdrawn EP0403648A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1988/000139 WO1990001057A1 (fr) 1988-07-25 1988-07-25 Liquide lubrifiant ininflammable

Publications (2)

Publication Number Publication Date
EP0403648A4 EP0403648A4 (fr) 1990-10-18
EP0403648A1 true EP0403648A1 (fr) 1990-12-27

Family

ID=21617271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89901346A Withdrawn EP0403648A1 (fr) 1988-07-25 1988-07-25 Liquide lubrifiant inflammable

Country Status (6)

Country Link
US (1) US4978466A (fr)
EP (1) EP0403648A1 (fr)
JP (1) JPH03501267A (fr)
CN (1) CN1042731A (fr)
FI (1) FI901360A0 (fr)
WO (1) WO1990001057A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5510045A (en) * 1988-07-14 1996-04-23 Diversey Corporation Alkaline diamine track lubricants
US20050027570A1 (en) * 2000-08-11 2005-02-03 Maier Frith Ann Digital image collection and library system
US8895476B2 (en) 2011-03-08 2014-11-25 Tetra Technologies, Inc. Thermal insulating fluids

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2029680A1 (en) * 1969-01-30 1970-10-23 Schmierstoffkombinat Electrolytic lubricant and cooling medium - for metal cutting
FR2360658A1 (fr) * 1976-08-04 1978-03-03 Singer & Hersch Industrial Dev Fluides industriels a base d'eau
FR2363623A1 (fr) * 1976-09-06 1978-03-31 Kosakewitch Michel Solutions aqueuses sans hydrocarbures, remplacant les emulsions et huiles classiques dans la coupe des metaux et permettant une economie d'energie
DE3123726A1 (de) * 1981-06-15 1982-12-30 Ludwig Müller GmbH u. Co KG, 7100 Heilbronn Haftoele
US4493777A (en) * 1982-12-20 1985-01-15 The Dow Chemical Company Water-based hydraulic fluids
SU1188202A1 (ru) * 1984-03-28 1985-10-30 Украинский Ордена "Знак Почета" Научно-Исследовательский Углехимический Институт Смазочно-охлаждающа жидкость дл механической обработки металлов
SU1384611A1 (ru) * 1986-09-05 1988-03-30 Научно-производственное объединение подшипниковой промышленности Раствор дл механической обработки металлов

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833502A (en) * 1973-04-30 1974-09-03 Nalco Chemical Co Method for improving the adherence of metalworking coolants to metal surfaces
IT1142162B (it) * 1980-12-23 1986-10-08 Anic Spa Composizione neutralizzante-lubrificante e suo impiego in motori diesel
DE3211352A1 (de) * 1982-03-27 1983-09-29 Hoechst Ag, 6230 Frankfurt Wasserhaltiges schmiermittel fuer saegeketten
US4522733A (en) * 1983-01-31 1985-06-11 American Polywater Corporation Substantially neutral aqueous lubricant
DE3447421A1 (de) * 1984-12-24 1986-06-26 Röhm GmbH, 6100 Darmstadt Polymere verdickungsmittel fuer waessrige hydraulikfluessigkeiten
US4728452A (en) * 1986-01-17 1988-03-01 Pony Industries, Inc. Metal corrosion inhibition in closed cooling systems
US4781847A (en) * 1986-05-08 1988-11-01 American Polywater Corporation Aqueous lubricant

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2029680A1 (en) * 1969-01-30 1970-10-23 Schmierstoffkombinat Electrolytic lubricant and cooling medium - for metal cutting
FR2360658A1 (fr) * 1976-08-04 1978-03-03 Singer & Hersch Industrial Dev Fluides industriels a base d'eau
FR2363623A1 (fr) * 1976-09-06 1978-03-31 Kosakewitch Michel Solutions aqueuses sans hydrocarbures, remplacant les emulsions et huiles classiques dans la coupe des metaux et permettant une economie d'energie
DE3123726A1 (de) * 1981-06-15 1982-12-30 Ludwig Müller GmbH u. Co KG, 7100 Heilbronn Haftoele
US4493777A (en) * 1982-12-20 1985-01-15 The Dow Chemical Company Water-based hydraulic fluids
SU1188202A1 (ru) * 1984-03-28 1985-10-30 Украинский Ордена "Знак Почета" Научно-Исследовательский Углехимический Институт Смазочно-охлаждающа жидкость дл механической обработки металлов
SU1384611A1 (ru) * 1986-09-05 1988-03-30 Научно-производственное объединение подшипниковой промышленности Раствор дл механической обработки металлов

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
See also references of WO9001057A1 *
SOVIET INVENTIONS ILLUSTRATED, woche 8620, 30. Mai 1988, Zusammenfassung Nr. 86-130661/20, Derwent Publications Ltd, London, GB; & SU-A-1188 202 (A.M. KHANIN) 30-05-1985 *
SOVIET INVENTIONS ILLUSTRATED, woche 8842, 30. November 1988, Zusammenfassung Nr. 88-298275/42, Derwent Publications Ltd, London, GB; & SU-A-1384 611 (V.I. ELISEEV) 30-03-1988 *

Also Published As

Publication number Publication date
EP0403648A4 (fr) 1990-10-18
FI901360A0 (fi) 1990-03-19
US4978466A (en) 1990-12-18
WO1990001057A1 (fr) 1990-02-08
CN1042731A (zh) 1990-06-06
JPH03501267A (ja) 1991-03-22

Similar Documents

Publication Publication Date Title
DE69605853T2 (de) Schmierölzusammensetzung aus tierischen und pflanzlichen Ölen
DE2107095C3 (de) Funktionelle Flüsskigkeiten und ihre Verwendung
GB1456623A (en) Stabilized dispersions of micronutrients in spray oils
EP0403648A1 (fr) Liquide lubrifiant inflammable
DE2113861A1 (de) Silicon-Schmiermittel
DE1129647B (de) Schmier- und Kuehlmittel fuer das Walzen von Metallen
DE112005000626T5 (de) Wenig Staub erzeugende Schmiermittelzusammensetzung und diese enthaltende, direkt einwirkende Führungsvorrichtung
DE3419415A1 (de) Herstellung von schmiermitteln, schaloelen und bohremulsionen aus umweltfreundlichen grundstoffen
EP0144922A2 (fr) Lubrifiant
DE1957955C3 (de) Halbflüssige synthetische Schmiermittel
DE3151973C2 (de) Schmiermittel
CN1142529A (zh) 一种高抗锈金属切削液及其制作方法
DE1903455A1 (de) Fluessige Zusammensetzungen zum Schneiden von Metallen
CN1094510C (zh) 冷却润滑乳化液
DE69103211T2 (de) Schmierölzusammensetzung.
DE1119444B (de) Hydraulische Fluessigkeit
DE817871C (de) Korrosionsschutzmittel
DD144071B1 (de) Schmierfett fuer tiefe temperaturen
DE2503613A1 (de) Schmiermittelzusammensetzung sowie verfahren und vorrichtung zur schmierung eines kuehl- oder kaelteerzeugungssystems
DE2609666C3 (de) Schmier- und Kühlmittel für die Metall- und Kunststoffbearbeitung
DE843282C (de) Hydraulische Fluessigkeiten
DE2260701C2 (de) Hydraulikflüssigkeiten
DE1121760B (de) Schmierfett
DE865622C (de) Schmier- und Metallbearbeitungsmittel
DE1150485B (de) Zusatzmittel fuer Mineralschmieroele

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19900309

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB IT LI SE

17Q First examination report despatched

Effective date: 19911002

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19920612