WO1994028284A1 - Sand screen structure - Google Patents
Sand screen structure Download PDFInfo
- Publication number
- WO1994028284A1 WO1994028284A1 PCT/US1994/005720 US9405720W WO9428284A1 WO 1994028284 A1 WO1994028284 A1 WO 1994028284A1 US 9405720 W US9405720 W US 9405720W WO 9428284 A1 WO9428284 A1 WO 9428284A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- porous
- perforated
- layers
- well
- disposed
- Prior art date
Links
- 239000004576 sand Substances 0.000 title claims abstract description 81
- 238000004519 manufacturing process Methods 0.000 claims abstract description 87
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 31
- 239000012528 membrane Substances 0.000 claims abstract description 22
- 239000010410 layer Substances 0.000 claims description 132
- 239000012530 fluid Substances 0.000 claims description 32
- 239000011241 protective layer Substances 0.000 claims description 16
- 239000013618 particulate matter Substances 0.000 claims description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 abstract description 13
- 239000000463 material Substances 0.000 description 32
- 230000015572 biosynthetic process Effects 0.000 description 23
- 238000005755 formation reaction Methods 0.000 description 23
- 238000009792 diffusion process Methods 0.000 description 12
- 239000002131 composite material Substances 0.000 description 10
- 238000010618 wire wrap Methods 0.000 description 10
- 238000009826 distribution Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 8
- 230000000712 assembly Effects 0.000 description 7
- 238000000429 assembly Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000004215 Carbon black (E152) Substances 0.000 description 5
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 5
- 229930195733 hydrocarbon Natural products 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- 238000012856 packing Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 241000270295 Serpentes Species 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/084—Screens comprising woven materials, e.g. mesh or cloth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/111—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter elements arranged for inward flow filtration
- B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter elements arranged for inward flow filtration
- B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
- B01D29/216—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets with wound sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
- B01D29/54—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
- B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/26—Filters with built-in pumps filters provided with a pump mounted in or on the casing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2027—Metallic material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/10—Reconditioning of well casings, e.g. straightening
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/082—Screens comprising porous materials, e.g. prepacked screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/04—Supports for the filtering elements
- B01D2201/0407—Perforated supports on both sides of the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/18—Filters characterised by the openings or pores
- B01D2201/188—Multiple filtering elements having filtering areas of different size
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Dispersion Chemistry (AREA)
- Filtering Materials (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94919194A EP0699271A4 (en) | 1993-05-25 | 1994-05-17 | Sand screen structure |
AU70421/94A AU679081B2 (en) | 1993-05-25 | 1994-05-17 | Sand screen structure |
CA002163754A CA2163754A1 (en) | 1993-05-25 | 1994-05-17 | Sand screen structure |
NO954746A NO954746L (en) | 1993-05-25 | 1995-11-23 | Sandscreen construction |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US6590893A | 1993-05-25 | 1993-05-25 | |
US08/065,908 | 1993-05-25 | ||
US22314994A | 1994-04-05 | 1994-04-05 | |
US08/223,149 | 1994-04-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994028284A1 true WO1994028284A1 (en) | 1994-12-08 |
Family
ID=26746164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1994/005720 WO1994028284A1 (en) | 1993-05-25 | 1994-05-17 | Sand screen structure |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0699271A4 (en) |
CN (1) | CN1124517A (en) |
AU (1) | AU679081B2 (en) |
CA (1) | CA2163754A1 (en) |
NO (1) | NO954746L (en) |
WO (1) | WO1994028284A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996018022A1 (en) * | 1994-12-07 | 1996-06-13 | Pall Corporation | Filter for subterranean wells |
WO1997017524A2 (en) * | 1995-11-08 | 1997-05-15 | Shell Internationale Research Maatschappij B.V. | Deformable well screen and method for its installation |
FR2754306A1 (en) * | 1996-09-24 | 1998-04-10 | Houston Well Screen Co | WELL FILTER ELEMENT |
CN111279051A (en) * | 2017-10-26 | 2020-06-12 | 3M创新有限公司 | Separating device and use of a separating device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101570352A (en) * | 2009-05-28 | 2009-11-04 | 张金松 | Water purifier active carbon filter element provided with folding protective layer |
CN103352677B (en) * | 2013-07-18 | 2016-01-20 | 太仓优尼泰克精密机械有限公司 | A kind of downhole petroleum sand control filter pipe |
US9579592B2 (en) * | 2015-04-06 | 2017-02-28 | Pall Corporation | Filter elements |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US679131A (en) * | 1898-11-07 | 1901-07-23 | Leslie H Thompson | Strainer or filter for pump tubes or barrels. |
US1229437A (en) * | 1916-10-09 | 1917-06-12 | William H Foster | Strainer. |
US1342986A (en) * | 1919-07-28 | 1920-06-08 | William H Cater | Well-screen |
US2217370A (en) * | 1939-08-08 | 1940-10-08 | Socony Vacuum Oil Co Inc | Screen wrapped perforated liner pipe |
US2877852A (en) * | 1954-09-20 | 1959-03-17 | Frank J Bashara | Well filters |
US4613369A (en) * | 1984-06-27 | 1986-09-23 | Pall Corporation | Porous metal article and method of making |
SU1530702A1 (en) * | 1987-04-15 | 1989-12-23 | Институт гидромеханики АН УССР | Deep-well filter |
US5190102A (en) * | 1990-10-22 | 1993-03-02 | Otis Engineering Corporation | Sintered metal substitute for prepack screen aggregate |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5088554A (en) * | 1990-10-22 | 1992-02-18 | Otis Engineering Corporation | Sintered metal sand screen |
-
1994
- 1994-05-17 WO PCT/US1994/005720 patent/WO1994028284A1/en not_active Application Discontinuation
- 1994-05-17 CN CN94192239A patent/CN1124517A/en active Pending
- 1994-05-17 EP EP94919194A patent/EP0699271A4/en not_active Withdrawn
- 1994-05-17 AU AU70421/94A patent/AU679081B2/en not_active Ceased
- 1994-05-17 CA CA002163754A patent/CA2163754A1/en not_active Abandoned
-
1995
- 1995-11-23 NO NO954746A patent/NO954746L/en not_active Application Discontinuation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US679131A (en) * | 1898-11-07 | 1901-07-23 | Leslie H Thompson | Strainer or filter for pump tubes or barrels. |
US1229437A (en) * | 1916-10-09 | 1917-06-12 | William H Foster | Strainer. |
US1342986A (en) * | 1919-07-28 | 1920-06-08 | William H Cater | Well-screen |
US2217370A (en) * | 1939-08-08 | 1940-10-08 | Socony Vacuum Oil Co Inc | Screen wrapped perforated liner pipe |
US2877852A (en) * | 1954-09-20 | 1959-03-17 | Frank J Bashara | Well filters |
US4613369A (en) * | 1984-06-27 | 1986-09-23 | Pall Corporation | Porous metal article and method of making |
SU1530702A1 (en) * | 1987-04-15 | 1989-12-23 | Институт гидромеханики АН УССР | Deep-well filter |
US5190102A (en) * | 1990-10-22 | 1993-03-02 | Otis Engineering Corporation | Sintered metal substitute for prepack screen aggregate |
Non-Patent Citations (1)
Title |
---|
See also references of EP0699271A4 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996018022A1 (en) * | 1994-12-07 | 1996-06-13 | Pall Corporation | Filter for subterranean wells |
WO1997017524A2 (en) * | 1995-11-08 | 1997-05-15 | Shell Internationale Research Maatschappij B.V. | Deformable well screen and method for its installation |
WO1997017524A3 (en) * | 1995-11-08 | 1997-06-19 | Shell Int Research | Deformable well screen and method for its installation |
FR2754306A1 (en) * | 1996-09-24 | 1998-04-10 | Houston Well Screen Co | WELL FILTER ELEMENT |
GB2320042A (en) * | 1996-09-24 | 1998-06-10 | Houston Well Screen Co | Well Screen |
GB2320042B (en) * | 1996-09-24 | 2000-12-06 | Houston Well Screen Co | Well screen |
CN111279051A (en) * | 2017-10-26 | 2020-06-12 | 3M创新有限公司 | Separating device and use of a separating device |
Also Published As
Publication number | Publication date |
---|---|
CA2163754A1 (en) | 1994-12-08 |
NO954746D0 (en) | 1995-11-23 |
AU679081B2 (en) | 1997-06-19 |
AU7042194A (en) | 1994-12-20 |
NO954746L (en) | 1995-11-23 |
CN1124517A (en) | 1996-06-12 |
EP0699271A1 (en) | 1996-03-06 |
EP0699271A4 (en) | 1996-06-05 |
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