GB2324095A - Compositions and processes for treating subterranean formations - Google Patents

Compositions and processes for treating subterranean formations

Info

Publication number
GB2324095A
GB2324095A GB9813343A GB9813343A GB2324095A GB 2324095 A GB2324095 A GB 2324095A GB 9813343 A GB9813343 A GB 9813343A GB 9813343 A GB9813343 A GB 9813343A GB 2324095 A GB2324095 A GB 2324095A
Authority
GB
United Kingdom
Prior art keywords
compositions
composition
processes
water
soluble polymer
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.)
Granted
Application number
GB9813343A
Other versions
GB2324095B (en
GB9813343D0 (en
Inventor
Iqbal Ahmed
Ahmad Moradi-Araghi
Aly-Anis Hamouda
Odd Ivar Eriksen
Bharatkuma Balubhail Patel
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.)
Phillips Petroleum Co
Original Assignee
Phillips Petroleum Co
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
Priority claimed from US08/575,434 external-priority patent/US6051670A/en
Priority claimed from US08/575,928 external-priority patent/US5650633A/en
Priority claimed from US08/575,429 external-priority patent/US5708107A/en
Priority claimed from US08/723,635 external-priority patent/US5922653A/en
Priority to GB9926318A priority Critical patent/GB2340832B/en
Application filed by Phillips Petroleum Co filed Critical Phillips Petroleum Co
Priority to GB9930053A priority patent/GB2340496B/en
Publication of GB9813343D0 publication Critical patent/GB9813343D0/en
Publication of GB2324095A publication Critical patent/GB2324095A/en
Publication of GB2324095B publication Critical patent/GB2324095B/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D295/00—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms
    • C07D295/16—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms acylated on ring nitrogen atoms
    • C07D295/18—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms acylated on ring nitrogen atoms by radicals derived from carboxylic acids, or sulfur or nitrogen analogues thereof
    • C07D295/182—Radicals derived from carboxylic acids
    • C07D295/185—Radicals derived from carboxylic acids from aliphatic carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C237/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups
    • C07C237/02—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of the carbon skeleton
    • C07C237/04—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of the carbon skeleton the carbon skeleton being acyclic and saturated
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
    • C07C309/01—Sulfonic acids
    • C07C309/02—Sulfonic acids having sulfo groups bound to acyclic carbon atoms
    • C07C309/03—Sulfonic acids having sulfo groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton
    • C07C309/13—Sulfonic acids having sulfo groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton containing nitrogen atoms, not being part of nitro or nitroso groups, bound to the carbon skeleton
    • C07C309/14—Sulfonic acids having sulfo groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton containing nitrogen atoms, not being part of nitro or nitroso groups, bound to the carbon skeleton containing amino groups bound to the carbon skeleton
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
    • C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
    • C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D231/12—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
    • C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
    • C07D233/56—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D249/00—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms
    • C07D249/02—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms not condensed with other rings
    • C07D249/08—1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
    • 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
    • C08F20/00—Homopolymers and 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
    • C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
    • C08F20/52—Amides or imides
    • C08F20/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
    • C08F20/60—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing nitrogen in addition to the carbonamido nitrogen
    • 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
    • C08F26/00—Homopolymers and 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
    • C08F26/02—Homopolymers and 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
    • 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
    • C08F8/00—Chemical modification by after-treatment
    • 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
    • C09K8/06—Clay-free compositions
    • C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
    • 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
    • C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific 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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/607—Compositions for stimulating production by acting on the underground formation specially adapted for clay formations
    • C09K8/608—Polymer compositions
    • 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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/66—Compositions based on water or polar solvents
    • C09K8/68—Compositions based on water or polar solvents containing organic compounds
    • C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
    • 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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/84—Compositions based on water or polar solvents
    • C09K8/86—Compositions based on water or polar solvents containing organic compounds
    • C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
    • 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
    • C08F2800/00—Copolymer characterised by the proportions of the comonomers expressed
    • C08F2800/20—Copolymer characterised by the proportions of the comonomers expressed as weight or mass percentages
    • 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
    • C08F2810/00—Chemical modification of a polymer
    • C08F2810/20—Chemical modification of a polymer leading to a crosslinking, either explicitly or inherently

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Dispersion Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Medicinal Preparation (AREA)

Abstract

Compositions and processes for using the compositions for applications in a subterranean formation are provided. The compositions include a composition which comprises a nitrogen-containing olefinic compound; a composition comprises a water-soluble polymer prepared from the nitrogen-containing olefinic compound and optionally an olefinic comonomer; a composition which comprises the water-soluble polymer, a cross-linking agent, and a liquid; and a composition which comprises a clay, the water-soluble polymer, and a liquid. These compositions can be used as or in compositions for enhanced oil recovery, drilling fluids, workover fluids, completion fluids, or combinations of any two or more thereof.
GB9813343A 1995-12-20 1996-11-13 Process for treating subterranean formations Expired - Lifetime GB2324095B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9930053A GB2340496B (en) 1995-12-20 1996-11-13 Compositions and processes for treating subterranean formations
GB9926318A GB2340832B (en) 1995-12-20 1996-11-13 Compositions and processes for treating subterranean formations

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US08/575,434 US6051670A (en) 1995-12-20 1995-12-20 Compositions and processes for treating subterranean formations
US08/575,429 US5708107A (en) 1995-12-20 1995-12-20 Compositions and processes for treating subterranean formations
US08/575,928 US5650633A (en) 1995-12-20 1995-12-20 Compositions and processes for treating subterranean formations
US08/723,635 US5922653A (en) 1995-12-20 1996-10-03 Compositions and processes for treating subterranean formations
PCT/US1996/018174 WO1997022638A1 (en) 1995-12-20 1996-11-13 Compositions and processes for treating subterranean formations

Publications (3)

Publication Number Publication Date
GB9813343D0 GB9813343D0 (en) 1998-08-19
GB2324095A true GB2324095A (en) 1998-10-14
GB2324095B GB2324095B (en) 2000-05-17

Family

ID=27504912

Family Applications (3)

Application Number Title Priority Date Filing Date
GB9926318A Expired - Lifetime GB2340832B (en) 1995-12-20 1996-11-13 Compositions and processes for treating subterranean formations
GB9930053A Expired - Lifetime GB2340496B (en) 1995-12-20 1996-11-13 Compositions and processes for treating subterranean formations
GB9813343A Expired - Lifetime GB2324095B (en) 1995-12-20 1996-11-13 Process for treating subterranean formations

Family Applications Before (2)

Application Number Title Priority Date Filing Date
GB9926318A Expired - Lifetime GB2340832B (en) 1995-12-20 1996-11-13 Compositions and processes for treating subterranean formations
GB9930053A Expired - Lifetime GB2340496B (en) 1995-12-20 1996-11-13 Compositions and processes for treating subterranean formations

Country Status (6)

Country Link
AU (1) AU719976B2 (en)
CA (1) CA2241362C (en)
GB (3) GB2340832B (en)
MX (1) MX9804985A (en)
NO (2) NO322844B1 (en)
WO (1) WO1997022638A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007059844A1 (en) * 2007-12-12 2009-06-25 Basf Construction Polymers Gmbh Copolymer based on a sulfonic acid-containing compound
FR2986034B1 (en) * 2012-01-20 2016-08-12 Snf Sas PROCESS FOR ASSISTED OIL RECOVERY BY INJECTION OF A POLYMERIC SOLUTION
FR2986033B1 (en) 2012-01-20 2016-08-05 Snf Sas PROCESS FOR ASSISTED OIL RECOVERY BY INJECTION OF A POLYMERIC SOLUTION
CN111454709B (en) * 2019-01-21 2022-06-24 中国石油化工股份有限公司 Seawater-based acid system
CN110776595B (en) * 2019-10-17 2021-09-21 中国石油天然气股份有限公司 Linear salt-resistant polymer for oil displacement and preparation method thereof
US11685852B2 (en) * 2020-09-03 2023-06-27 Aramco Services Company Reservoir drilling fluids consist of cationic heterocyclic polymers, synthesis, formulation, and applications
CN114213584B (en) * 2021-12-24 2023-05-26 西南石油大学 Ionic liquid polymer, preparation method and application thereof, inhibitor and application thereof
CN116535587B (en) * 2023-06-13 2023-10-27 石家庄华莱鼎盛科技有限公司 Natural plant polyphenol modified phenolic resin filtrate reducer for drilling fluid

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05179155A (en) * 1991-12-27 1993-07-20 Kuraray Co Ltd Composition
JPH07258202A (en) * 1994-03-18 1995-10-09 Nippon Oil & Fats Co Ltd Polymerizable betaine compound
JPH07300513A (en) * 1994-05-09 1995-11-14 Nippon Oil & Fats Co Ltd Material with grafted surface

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1266898B (en) * 1961-04-15 1968-04-25 Basf Ag Process for the production of dyes of the azo, anthraquinone and phthalocyanine series
GB1221820A (en) * 1967-05-12 1971-02-10 Basf Ag Basic azo dyes
CH645653A5 (en) * 1980-08-01 1984-10-15 Ciba Geigy Ag QUATERNAERE, COPOLYMERE, HIGH MOLECULAR AMMONIUM SALTS ON ACRYLIC BASE, THE PRODUCTION AND USE THEREOF AS ACTIVE COMPONENTS IN COSMETIC AGENTS.
DE3572985D1 (en) * 1984-05-11 1989-10-19 Bristol Myers Co Novel bile sequestrant resin and uses
JPH0788505B2 (en) * 1986-06-02 1995-09-27 三井東圧化学株式会社 Third oil recovery agent
US5384232A (en) * 1991-12-02 1995-01-24 E. I. Du Pont De Nemours And Company Process for rapid access development of silver halide films using pyridinium as development accelerators
US5270382A (en) * 1992-04-24 1993-12-14 Phillips Petroleum Company Compositions and applications thereof of water-soluble copolymers comprising an ampholytic imidazolium inner salt
US5250642A (en) * 1992-05-20 1993-10-05 Phillips Petroleum Company Copolymers of ampholytic ion pairs containing vinylic tertiary amine and olefinic comonomers
US5378842A (en) * 1993-12-21 1995-01-03 E. I. Du Pont De Nemours And Company Imidazolium hardeners for proteinaceous materials
JPH07258342A (en) * 1994-03-22 1995-10-09 Toyobo Co Ltd Salt water resistant latex
US5563214A (en) * 1994-08-09 1996-10-08 Henkel Corporation Aqueous compositions containing polymerizable surfactant compounds

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05179155A (en) * 1991-12-27 1993-07-20 Kuraray Co Ltd Composition
JPH07258202A (en) * 1994-03-18 1995-10-09 Nippon Oil & Fats Co Ltd Polymerizable betaine compound
JPH07300513A (en) * 1994-05-09 1995-11-14 Nippon Oil & Fats Co Ltd Material with grafted surface

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Koberle et al, Macromolecules, April 1994, No 27, 2165-2173 *

Also Published As

Publication number Publication date
MX9804985A (en) 1998-09-30
AU719976B2 (en) 2000-05-18
WO1997022638A1 (en) 1997-06-26
GB9926318D0 (en) 2000-01-12
NO982888D0 (en) 1998-06-19
GB2340496B (en) 2000-05-17
GB2340496A (en) 2000-02-23
AU7729796A (en) 1997-07-14
GB2324095B (en) 2000-05-17
CA2241362C (en) 2005-03-29
GB2340832B (en) 2000-05-10
GB9813343D0 (en) 1998-08-19
GB9930053D0 (en) 2000-02-09
NO982888L (en) 1998-08-20
NO322844B1 (en) 2006-12-11
CA2241362A1 (en) 1997-06-26
NO20054619D0 (en) 2005-10-07
GB2340832A (en) 2000-03-01
NO20054619L (en) 1998-08-20

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Expiry date: 20161112