CA1266558A - Peroxygen breaker systems for well completion fluids - Google Patents
Peroxygen breaker systems for well completion fluidsInfo
- Publication number
- CA1266558A CA1266558A CA000512014A CA512014A CA1266558A CA 1266558 A CA1266558 A CA 1266558A CA 000512014 A CA000512014 A CA 000512014A CA 512014 A CA512014 A CA 512014A CA 1266558 A CA1266558 A CA 1266558A
- Authority
- CA
- Canada
- Prior art keywords
- hydraulic medium
- peroxygen compound
- weight
- free radical
- radical scavenger
- 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 - Lifetime
Links
- 239000012530 fluid Substances 0.000 title claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 19
- 150000001875 compounds Chemical class 0.000 claims description 26
- 239000002516 radical scavenger Substances 0.000 claims description 18
- -1 nitrite ions Chemical class 0.000 claims description 17
- 229940123457 Free radical scavenger Drugs 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 13
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical class [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 11
- 229910052783 alkali metal Chemical class 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 150000003254 radicals Chemical class 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 229940005654 nitrite ion Drugs 0.000 claims description 9
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 8
- 150000004676 glycans Chemical class 0.000 claims description 6
- 229920001282 polysaccharide Polymers 0.000 claims description 6
- 239000005017 polysaccharide Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical class CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 claims description 6
- 150000001298 alcohols Chemical class 0.000 claims description 5
- 150000002989 phenols Chemical class 0.000 claims description 5
- 125000000746 allylic group Chemical group 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 235000010288 sodium nitrite Nutrition 0.000 claims description 4
- 230000002401 inhibitory effect Effects 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 230000007062 hydrolysis Effects 0.000 claims description 2
- 238000006460 hydrolysis reaction Methods 0.000 claims description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical class OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims 10
- 150000001340 alkali metals Chemical class 0.000 claims 4
- 239000000178 monomer Substances 0.000 claims 4
- 229920001577 copolymer Polymers 0.000 claims 1
- 229910017464 nitrogen compound Inorganic materials 0.000 claims 1
- 150000002830 nitrogen compounds Chemical class 0.000 claims 1
- 239000000725 suspension Substances 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 abstract description 17
- 230000007423 decrease Effects 0.000 abstract description 2
- 239000013618 particulate matter Substances 0.000 abstract 1
- 244000303965 Cyamopsis psoralioides Species 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 229910021645 metal ion Inorganic materials 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000002028 premature Effects 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- RBWSWDPRDBEWCR-RKJRWTFHSA-N sodium;(2r)-2-[(2r)-3,4-dihydroxy-5-oxo-2h-furan-2-yl]-2-hydroxyethanolate Chemical compound [Na+].[O-]C[C@@H](O)[C@H]1OC(=O)C(O)=C1O RBWSWDPRDBEWCR-RKJRWTFHSA-N 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- ORTVZLZNOYNASJ-UPHRSURJSA-N (z)-but-2-ene-1,4-diol Chemical compound OC\C=C/CO ORTVZLZNOYNASJ-UPHRSURJSA-N 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 240000007049 Juglans regia Species 0.000 description 1
- 235000009496 Juglans regia Nutrition 0.000 description 1
- 229920000161 Locust bean gum Polymers 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 101150054830 S100A6 gene Proteins 0.000 description 1
- LCKIEQZJEYYRIY-UHFFFAOYSA-N Titanium ion Chemical compound [Ti+4] LCKIEQZJEYYRIY-UHFFFAOYSA-N 0.000 description 1
- LEHOTFFKMJEONL-UHFFFAOYSA-N Uric Acid Chemical compound N1C(=O)NC(=O)C2=C1NC(=O)N2 LEHOTFFKMJEONL-UHFFFAOYSA-N 0.000 description 1
- TVWHNULVHGKJHS-UHFFFAOYSA-N Uric acid Natural products N1C(=O)NC(=O)C2NC(=O)NC21 TVWHNULVHGKJHS-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical compound [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- BFGKITSFLPAWGI-UHFFFAOYSA-N chromium(3+) Chemical compound [Cr+3] BFGKITSFLPAWGI-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- MPMSMUBQXQALQI-UHFFFAOYSA-N cobalt phthalocyanine Chemical compound [Co+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 MPMSMUBQXQALQI-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 1
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000711 locust bean gum Substances 0.000 description 1
- 235000010420 locust bean gum Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- LVIYYTJTOKJJOC-UHFFFAOYSA-N nickel phthalocyanine Chemical compound [Ni+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 LVIYYTJTOKJJOC-UHFFFAOYSA-N 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 125000000864 peroxy group Chemical group O(O*)* 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229940116269 uric acid Drugs 0.000 description 1
- 235000020234 walnut Nutrition 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/925—Completion or workover fluid
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Gas-Insulated Switchgears (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Polymerisation Methods In General (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Fats And Perfumes (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Disintegrating Or Milling (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000512014A CA1266558A (en) | 1985-08-07 | 1986-06-20 | Peroxygen breaker systems for well completion fluids |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/763,169 US4610795A (en) | 1985-08-07 | 1985-08-07 | Peroxygen breaker systems for well completion fluids |
| US763,169 | 1985-08-07 | ||
| CA000512014A CA1266558A (en) | 1985-08-07 | 1986-06-20 | Peroxygen breaker systems for well completion fluids |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA1266558C CA1266558C (en) | 1990-03-13 |
| CA1266558A true CA1266558A (en) | 1990-03-13 |
Family
ID=25067066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000512014A Expired - Lifetime CA1266558A (en) | 1985-08-07 | 1986-06-20 | Peroxygen breaker systems for well completion fluids |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4610795A (cg-RX-API-DMAC7.html) |
| EP (1) | EP0213095B1 (cg-RX-API-DMAC7.html) |
| JP (1) | JPS6233995A (cg-RX-API-DMAC7.html) |
| AT (1) | ATE54719T1 (cg-RX-API-DMAC7.html) |
| CA (1) | CA1266558A (cg-RX-API-DMAC7.html) |
| DE (1) | DE3672716D1 (cg-RX-API-DMAC7.html) |
| MX (1) | MX164215B (cg-RX-API-DMAC7.html) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4741401A (en) * | 1987-01-16 | 1988-05-03 | The Dow Chemical Company | Method for treating subterranean formations |
| US4832123A (en) * | 1988-02-01 | 1989-05-23 | Mobil Oil Corp. | Removing fracture fluid via chemical blowing agents |
| US4941537A (en) * | 1988-02-25 | 1990-07-17 | Hi-Tek Polymers, Inc. | Method for reducing the viscosity of aqueous fluid |
| US5055209A (en) * | 1989-05-01 | 1991-10-08 | Osca, Inc. | Reduction of the viscosity of solutions viscosified with Xanthan gum polymers |
| US5103905A (en) * | 1990-05-03 | 1992-04-14 | Dowell Schlumberger Incorporated | Method of optimizing the conductivity of a propped fractured formation |
| US5054552A (en) * | 1990-08-31 | 1991-10-08 | The Western Company Of North America | Breaker system for aqueous fluids containing xanthan gums |
| US5106518A (en) * | 1990-11-09 | 1992-04-21 | The Western Company Of North America | Breaker system for high viscosity fluids and method of use |
| US5164099A (en) * | 1990-12-06 | 1992-11-17 | The Western Company Of North America | Encapsulations for treating subterranean formations and methods for the use thereof |
| US5160445A (en) * | 1991-05-24 | 1992-11-03 | Zirconium Technology Corporation | Borate cross-linking solutions |
| US5262018A (en) * | 1991-08-12 | 1993-11-16 | Fmc Corporation | Metals removal from aqueous peroxy acids or peroxy salts |
| US5217074A (en) * | 1991-10-29 | 1993-06-08 | Exxon Chemical Patents Inc. | Method of fracturing formations |
| US5373901A (en) * | 1993-07-27 | 1994-12-20 | Halliburton Company | Encapsulated breakers and method for use in treating subterranean formations |
| US5604186A (en) * | 1995-02-15 | 1997-02-18 | Halliburton Company | Encapsulated enzyme breaker and method for use in treating subterranean formations |
| US6131661A (en) * | 1998-08-03 | 2000-10-17 | Tetra Technologies Inc. | Method for removing filtercake |
| US6209646B1 (en) | 1999-04-21 | 2001-04-03 | Halliburton Energy Services, Inc. | Controlling the release of chemical additives in well treating fluids |
| US6213213B1 (en) * | 1999-10-08 | 2001-04-10 | Halliburton Energy Services, Inc. | Methods and viscosified compositions for treating wells |
| US6444316B1 (en) | 2000-05-05 | 2002-09-03 | Halliburton Energy Services, Inc. | Encapsulated chemicals for use in controlled time release applications and methods |
| US6357527B1 (en) | 2000-05-05 | 2002-03-19 | Halliburton Energy Services, Inc. | Encapsulated breakers and method for use in treating subterranean formations |
| RU2011128428A (ru) * | 2008-12-09 | 2013-01-20 | Фмк Корпорейшн | Удаление акриламида из массивов водных текучих сред |
| US8575075B2 (en) * | 2009-02-27 | 2013-11-05 | Fmc Corporation | Oil-field viscosity breaker method utilizing a peracid |
| RU2467163C1 (ru) * | 2011-04-01 | 2012-11-20 | Общество с ограниченной ответственностью "ЛУКОЙЛ-Инжиниринг" (ООО "ЛУКОЙЛ-Инжиниринг") | Способ технологической обработки ствола скважины, преимущественно пологой и горизонтальной, для удаления кольматирующих образований из призабойной зоны пласта |
| EP3009491B1 (en) | 2013-06-10 | 2019-08-21 | Sumitomo Seika Chemicals CO. LTD. | Fracturing fluid viscosity-controlling agent to be used in hydraulic fracturing |
| WO2016051777A1 (ja) * | 2014-09-30 | 2016-04-07 | 株式会社日本触媒 | 含水状態の吸水性樹脂を液状化する方法および収縮させる方法 |
| US10035947B2 (en) | 2015-03-13 | 2018-07-31 | Los Acquisition Co. I Llc | Method for chemically controlling delay time for breaking polymers |
| JP6569482B2 (ja) * | 2015-11-06 | 2019-09-04 | 王子ホールディングス株式会社 | 地下層処理用組成物、地下層処理用流体、地下層処理用流体の製造方法及び地下層の処理方法 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3014863A (en) * | 1957-11-18 | 1961-12-26 | Jersey Prod Res Co | Preparation of well completion and servicing fluid |
| US3727688A (en) * | 1972-02-09 | 1973-04-17 | Phillips Petroleum Co | Hydraulic fracturing method |
| US3827898A (en) * | 1973-04-06 | 1974-08-06 | Hercules Inc | Method of reducing the rate of oxidative degradation of cellulose ether |
| US4144179A (en) * | 1975-07-21 | 1979-03-13 | Halliburton Company | Composition for treating low temperature subterranean well formations |
| US4169798A (en) * | 1976-11-26 | 1979-10-02 | Celanese Corporation | Well-treating compositions |
| US4137182A (en) * | 1977-06-20 | 1979-01-30 | Standard Oil Company (Indiana) | Process for fracturing well formations using aqueous gels |
| US4560486A (en) * | 1978-06-26 | 1985-12-24 | The Dow Chemical Company | Breaker system for high viscosity fluids |
| US4250044A (en) * | 1978-06-26 | 1981-02-10 | The Dow Chemical Company | Breaker system for high viscosity fluids |
| US4246124A (en) * | 1978-07-17 | 1981-01-20 | Phillips Petroleum Company | Gelled compositions and well treating |
| US4202795A (en) * | 1978-09-28 | 1980-05-13 | Halliburton Company | Methods and additives for delaying the release of chemicals in aqueous fluids |
| US4234433A (en) * | 1978-10-04 | 1980-11-18 | Marathon Oil Company | Recovery of petroleum with chemically treated high molecular weight polymers |
| US4331543A (en) * | 1978-10-16 | 1982-05-25 | Mobil Oil Corporation | Method of retarding degradation of surfactants employed in waterflooding |
| US4389320A (en) * | 1979-12-04 | 1983-06-21 | Phillips Petroleum Company | Foamable compositions and formations treatment |
| US4552675A (en) * | 1983-08-19 | 1985-11-12 | Fmc Corporation | Composition and method for treating a subterranean formation |
-
1985
- 1985-08-07 US US06/763,169 patent/US4610795A/en not_active Expired - Fee Related
-
1986
- 1986-06-20 CA CA000512014A patent/CA1266558A/en not_active Expired - Lifetime
- 1986-07-08 AT AT86850247T patent/ATE54719T1/de not_active IP Right Cessation
- 1986-07-08 EP EP86850247A patent/EP0213095B1/en not_active Expired - Lifetime
- 1986-07-08 DE DE8686850247T patent/DE3672716D1/de not_active Expired - Lifetime
- 1986-07-10 JP JP61160975A patent/JPS6233995A/ja active Granted
- 1986-08-05 MX MX3381A patent/MX164215B/es unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CA1266558C (en) | 1990-03-13 |
| DE3672716D1 (de) | 1990-08-23 |
| EP0213095A3 (en) | 1987-08-26 |
| EP0213095A2 (en) | 1987-03-04 |
| JPS6233995A (ja) | 1987-02-13 |
| US4610795A (en) | 1986-09-09 |
| EP0213095B1 (en) | 1990-07-18 |
| ATE54719T1 (de) | 1990-08-15 |
| JPH0444677B2 (cg-RX-API-DMAC7.html) | 1992-07-22 |
| MX164215B (es) | 1992-07-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 19940913 |