AR248034A1 - Polimeros mixtos hidrosolubles, suspensiones de materiales , procedimiento para su preparacion y aplicacion - Google Patents
Polimeros mixtos hidrosolubles, suspensiones de materiales , procedimiento para su preparacion y aplicacionInfo
- Publication number
- AR248034A1 AR248034A1 AR91321041A AR32104191A AR248034A1 AR 248034 A1 AR248034 A1 AR 248034A1 AR 91321041 A AR91321041 A AR 91321041A AR 32104191 A AR32104191 A AR 32104191A AR 248034 A1 AR248034 A1 AR 248034A1
- Authority
- AR
- Argentina
- Prior art keywords
- weight
- groups
- formula
- suspensions
- radical
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2652—Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F226/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
- C08F226/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen by a single or double bond to nitrogen
- C08F226/04—Diallylamine
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D17/00—Pigment pastes, e.g. for mixing in paints
- C09D17/001—Pigment pastes, e.g. for mixing in paints in aqueous medium
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/487—Fluid loss control additives; Additives for reducing or preventing circulation loss
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Ceramic Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Wood Science & Technology (AREA)
- Dispersion Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
EL POLIMERO MIXTO HIDROSOLUBLE CONSISTE EN HASTA 5 A 90% EN PESO DE GRUPOS DE LA FORMULA I, DONDE R1 ES HIDROGENO O METILO, R2 ES ALQUILENO, Y ME ES AMONIO O UN METAL ALCALINO, HASTA 5 A 90% EN PESO DE GRUPOS DE FORMULA II, DONDE X ES HALOGENO, R3 Y R4 INDEPENDIENTEMENTE ENTRE SI SIGNIFICAN ALQUILO, HASTA 0 A 60% EN PESO DE GRUPOS DE FORMULA III; EN LA CUAL R5 Y R6 CONJUNTAMENTE SIGNIFICAN UN GRUPO PROPILENO, QUE CON INCLUSION DE UN RADICAL (A), FORMAN UN RADICAL PIRROLIDONA, Y HASTA 0 A 30% EN PESO DE GRUPOS DE FORMULA IV, DONDE R7 ES HIDROGENO O METILO Y R8 ES CONH2, CON(CH3)2, CIANO, SO3H, SO3ME, C6H4SO3H, C6H4SO3ME, CH2SO3H, CH2SO3ME, COOH, COOME O CARBOXI-ALQUILO, DONDE ME ES AMONIO O UN CATION DE METAL ALCALINO Y EL ORDEN DE LOS COMPONENTES I HASTA IV PUEDE SER INDISTINTO. EL POLIMERO MIXTO PUEDE SER EMPLEADO COMO ADITIVO ACEPTOR DE AGUA PARA SUSPENSION DE MATERIAL SOLIDO, PREFERENTEMENTE PARA SUSPENSIONES DE CEMENTO, SUSPENSIONES DE YESO, ARGAMASAS, BARRIDOS O SUSPENSIONESÑ DE PIGMENTOS, O EN CALIDAD DE ADITIVO ACEPTOR DE AGUA PARA SOLUCIONES SALINAS ACUOSAS.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4034642A DE4034642A1 (de) | 1990-10-31 | 1990-10-31 | Wasserloesliche mischpolymerisate und deren verwendung |
Publications (1)
Publication Number | Publication Date |
---|---|
AR248034A1 true AR248034A1 (es) | 1995-05-31 |
Family
ID=6417387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AR91321041A AR248034A1 (es) | 1990-10-31 | 1991-10-29 | Polimeros mixtos hidrosolubles, suspensiones de materiales , procedimiento para su preparacion y aplicacion |
Country Status (9)
Country | Link |
---|---|
US (1) | US5510436A (es) |
EP (1) | EP0483638B1 (es) |
JP (1) | JPH05186537A (es) |
AR (1) | AR248034A1 (es) |
BR (1) | BR9104709A (es) |
CA (1) | CA2054518A1 (es) |
DE (2) | DE4034642A1 (es) |
MX (1) | MX9101832A (es) |
NO (1) | NO300643B1 (es) |
Families Citing this family (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5380705A (en) * | 1990-01-25 | 1995-01-10 | Phillips Petroleum Company | Drilling mud comprising tetrapolymer consisting of n-vinyl-2-pyrrolidone, acrylamidopropanesulfonicacid, acrylamide, and acrylic acid |
US5135909A (en) * | 1990-01-25 | 1992-08-04 | Phillips Petroleum Company | Drilling mud comprising tetrapolymer consisting of N-vinyl-2-pyrrolidone, acrylamidopropanesulfonic acid, acrylamide, and acrylic acid |
US5720888A (en) * | 1993-11-12 | 1998-02-24 | Betzdearborn Inc. | Water-soluble cationic copolymers and their use as flocculants |
US5700893A (en) * | 1993-11-12 | 1997-12-23 | Betzdearborn Inc. | Water-soluble cationic copolymers and their use as flocculants and drainage aids |
US5529699A (en) * | 1993-11-12 | 1996-06-25 | W. R. Grace & Co.-Conn. | Water-soluble cationic copolymers and their use as flocculants |
US5473033A (en) * | 1993-11-12 | 1995-12-05 | W. R. Grace & Co.-Conn. | Water-soluble cationic copolymers and their use as drainage retention aids in papermaking processes |
US5516852A (en) * | 1993-11-12 | 1996-05-14 | W. R. Grace & Co.-Conn. | Method of producing water-soluble cationic copolymers |
DE19508191A1 (de) * | 1995-03-09 | 1996-09-12 | Hoechst Ag | Anionische Polymermischungen mit reduzierter Schaumbildung in Wasser |
US6169058B1 (en) | 1997-06-05 | 2001-01-02 | Bj Services Company | Compositions and methods for hydraulic fracturing |
US6228812B1 (en) * | 1998-12-10 | 2001-05-08 | Bj Services Company | Compositions and methods for selective modification of subterranean formation permeability |
DE19909231C2 (de) | 1999-03-03 | 2001-04-19 | Clariant Gmbh | Wasserlösliche Copolymere auf AMPS-Basis und ihre Verwendung als Bohrhilfsmittel |
US6281172B1 (en) * | 1999-04-07 | 2001-08-28 | Akzo Nobel Nv | Quaternary nitrogen containing amphoteric water soluble polymers and their use in drilling fluids |
DE19926355A1 (de) * | 1999-06-10 | 2000-12-14 | Clariant Gmbh | Wasserlösliche Mischpolymere und ihre Verwendung für Exploration und Förderung von Erdöl und Erdgas |
DE19931218B4 (de) * | 1999-07-06 | 2005-06-02 | Clariant Gmbh | Verwendung von Polymeren als Anti-Nebel-Additiv in wasserbasierenden Kühlschmierstoffen |
DE19931219C2 (de) * | 1999-07-06 | 2001-06-07 | Clariant Gmbh | Verwendung von Polymeren als Anti-Nebel-Additiv in wasserbasierenden Kühlschmierstoffen |
DE19931220B4 (de) * | 1999-07-06 | 2005-03-10 | Clariant Gmbh | Verwendung von Polymeren als Anti-Nebel-Additiv in wasserbasierenden Kühlschmierstoffen |
AU6406000A (en) * | 1999-07-16 | 2001-02-05 | Calgon Corporation | Ampholyte polymer composition and method of use |
DE10000648A1 (de) | 2000-01-11 | 2001-07-12 | Clariant Gmbh | Wasserlösliche oder wasserquellbare vernetzte Copolymere |
EP1185579B1 (en) * | 2000-01-25 | 2009-09-09 | Cabot Corporation | Polymers containing modified pigments and methods of preparing the same |
US6465397B1 (en) * | 2000-02-11 | 2002-10-15 | Clariant Finance (Bvi) Limited | Synthetic crosslinked copolymer solutions and direct injection to subterranean oil and gas formations |
CN1118532C (zh) * | 2000-03-02 | 2003-08-20 | 王斌 | 高温高压高矿化度钻井液流变性稳定剂 |
DE10037629A1 (de) * | 2000-08-02 | 2002-02-14 | Skw Bauwerkstoffe Deutschland | Wasserlösliche oder wasserquellbare sulfogruppenhaltige assoziativverdickende Copolymere, Verfahren zu deren Herstellung und deren Verwendung |
DE10041392A1 (de) | 2000-08-23 | 2002-03-07 | Stockhausen Chem Fab Gmbh | Wasserlösliche Homo- und Copolymere mit verbesserter Umweltverträglichkeit |
DE10110336A1 (de) * | 2001-03-03 | 2002-09-12 | Clariant Gmbh | Tensidfreie kosmetische, dermatologische und pharmazeutische Mittel |
US7044170B2 (en) * | 2002-08-14 | 2006-05-16 | Construction Research & Technology Gmbh | Hydraulic cementitious composition with improved bleeding resistance |
DE10315182A1 (de) * | 2003-04-03 | 2004-10-14 | Clariant Gmbh | Verfahren zur Herstellung von stabilen Polymer-Konzentraten |
DE102004032304A1 (de) | 2004-07-03 | 2006-02-16 | Construction Research & Technology Gmbh | Wasserlösliche sulfogruppenhaltige Copolymere, Verfahren zu deren Herstellung und ihre Verwendung |
DE102006047091A1 (de) * | 2006-10-05 | 2008-04-10 | Basf Construction Polymers Gmbh | Neue Zusammensetzung auf Polyvinylalkohol-Basis |
US20110160336A1 (en) * | 2006-10-05 | 2011-06-30 | Roland Reichenbach-Klinke | Method of use of a polyvinyl alcohol-based composition |
DE102007037466A1 (de) | 2007-08-08 | 2009-02-12 | Basf Construction Polymers Gmbh | Pfropfpolymer-Mischung |
EP2075300A1 (en) | 2007-10-09 | 2009-07-01 | Bp Exploration Operating Company Limited | Wellbore fluid |
EP2075301A1 (en) | 2007-10-09 | 2009-07-01 | Bp Exploration Operating Company Limited | Technology useful in wellbore fluids |
US8685900B2 (en) * | 2009-04-03 | 2014-04-01 | Halliburton Energy Services, Inc. | Methods of using fluid loss additives comprising micro gels |
JP5434256B2 (ja) * | 2009-05-19 | 2014-03-05 | 東亞合成株式会社 | 掘削泥水用添加剤及びその製造方法並びにそれを用いた掘削泥水 |
WO2014005778A1 (en) | 2012-07-06 | 2014-01-09 | Basf Se | Biodegradable graft copolymer anti -accretion additive for water - based drilling fluids |
AU2013323888B2 (en) | 2012-09-28 | 2015-09-03 | Halliburton Energy Services, Inc. | Methods and compositions for treating a subterranean formation with salt-tolerant cement slurries |
JP6043591B2 (ja) * | 2012-10-31 | 2016-12-14 | 株式会社日本触媒 | セメント添加剤及びセメント組成物 |
US9315713B2 (en) | 2013-11-21 | 2016-04-19 | Halliburton Energy Services, Inc. | Amphoteric polymer suspending agent for use in calcium aluminate cement compositions |
CN104193897A (zh) * | 2014-08-28 | 2014-12-10 | 中国石油集团渤海钻探工程有限公司 | 一种耐高温抗盐油井水泥降失水剂及其制备方法 |
WO2016032494A1 (en) | 2014-08-28 | 2016-03-03 | Halliburton Energy Services, Inc. | Cement slurries with salt-tolerant fluid loss additives and methods relating thereto |
MX2017004209A (es) * | 2014-12-19 | 2017-06-06 | Halliburton Energy Services Inc | Composicion que incluye un polimero viscosificante y modificador de la viscosidad de poliamina para el tratamiento de formaciones subterraneas. |
US10113098B2 (en) | 2014-12-19 | 2018-10-30 | Halliburton Energy Servives, Inc. | Composition including viscosifier polymer and polyamine viscosity modifier for treatment of subterranean formations |
CN105237679B (zh) * | 2015-10-30 | 2017-12-19 | 卫辉市化工有限公司 | 一种油井水泥乳液聚合物降失水剂的制备方法 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3629101A (en) * | 1968-03-02 | 1971-12-21 | Hoechst Ag | Water-base clayey drilling fluids |
DE2444108C2 (de) * | 1974-09-14 | 1978-01-19 | Hoechst Ag | Wasserbasische tonspuelung fuer tiefbohrungen und verwendung eines mischpolymerisats fuer solche spuelungen |
US3994852A (en) * | 1974-09-23 | 1976-11-30 | Calgon Corporation | Low fluid loss cementing compositions containing polyvinylpyrrolidone-polyacrylamide triblock polymers and their use |
US4015991A (en) * | 1975-08-08 | 1977-04-05 | Calgon Corporation | Low fluid loss cementing compositions containing hydrolyzed acrylamide/2-acrylamido-2-methylpropane sulfonic acid derivative copolymers and their use |
LU78170A1 (fr) * | 1977-09-23 | 1979-05-25 | Oreal | Nouvelles compositions cosmetiques pour les cheveux et la peau a base de polymeres amines comportant des motifs a structure cyclique |
US4176107A (en) * | 1978-01-20 | 1979-11-27 | Buckman Laboratories, Inc. | Water-soluble dispersions of high molecular water-soluble polymers containing a surfactant and a water-soluble organic carrier which is a hydroxy compound containing repeating alkylene oxide units |
DE2931897A1 (de) * | 1979-08-06 | 1981-02-26 | Cassella Ag | Wasserloesliches copolymerisat und seine herstellung |
DE3302168A1 (de) * | 1983-01-24 | 1984-07-26 | Hoechst Ag, 6230 Frankfurt | Zementschlaemme fuer tiefbohrungen mit einem gehalt an copolymerisaten zur verminderung des wasserverlustes |
US4619773A (en) * | 1983-05-02 | 1986-10-28 | Mobil Oil Corporation | High temperature stable aqueous brine fluids viscosified by water-soluble copolymers of acrylamidomethylpropanesulfonic acid salts |
US4555269A (en) * | 1984-03-23 | 1985-11-26 | Halliburton Company | Hydrolytically stable polymers for use in oil field cementing methods and compositions |
US4536292A (en) * | 1984-03-26 | 1985-08-20 | Calgon Corporation | Carboxylic/sulfonic/quaternary ammonium polymers for use as scale and corrosion inhibitors |
US4608425A (en) * | 1985-01-02 | 1986-08-26 | Exxon Research And Engineering Co. | High charge density polymeric complexes - viscosifiers for acid, base and salt (aqueous) solutions |
US4861499A (en) * | 1987-10-13 | 1989-08-29 | American Cyanamid Company | Water-dispersible hydrophobic thickening agent |
-
1990
- 1990-10-31 DE DE4034642A patent/DE4034642A1/de not_active Withdrawn
-
1991
- 1991-10-22 DE DE59107925T patent/DE59107925D1/de not_active Expired - Fee Related
- 1991-10-22 EP EP91117945A patent/EP0483638B1/de not_active Expired - Lifetime
- 1991-10-29 MX MX9101832A patent/MX9101832A/es not_active IP Right Cessation
- 1991-10-29 AR AR91321041A patent/AR248034A1/es active
- 1991-10-30 NO NO914252A patent/NO300643B1/no unknown
- 1991-10-30 BR BR919104709A patent/BR9104709A/pt not_active Application Discontinuation
- 1991-10-30 JP JP3285068A patent/JPH05186537A/ja active Pending
- 1991-10-30 CA CA002054518A patent/CA2054518A1/en not_active Abandoned
-
1994
- 1994-06-15 US US08/260,037 patent/US5510436A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0483638A1 (de) | 1992-05-06 |
EP0483638B1 (de) | 1996-06-12 |
NO914252L (no) | 1992-05-04 |
NO300643B1 (no) | 1997-06-30 |
CA2054518A1 (en) | 1992-05-01 |
DE4034642A1 (de) | 1992-05-07 |
DE59107925D1 (de) | 1996-07-18 |
JPH05186537A (ja) | 1993-07-27 |
NO914252D0 (no) | 1991-10-30 |
BR9104709A (pt) | 1992-06-16 |
MX9101832A (es) | 1992-06-05 |
US5510436A (en) | 1996-04-23 |
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