BR9508924A - Processos e aparelho para realização de medidas com base em um acelerador durante a perfuração - Google Patents
Processos e aparelho para realização de medidas com base em um acelerador durante a perfuraçãoInfo
- Publication number
- BR9508924A BR9508924A BR9508924A BR9508924A BR9508924A BR 9508924 A BR9508924 A BR 9508924A BR 9508924 A BR9508924 A BR 9508924A BR 9508924 A BR9508924 A BR 9508924A BR 9508924 A BR9508924 A BR 9508924A
- Authority
- BR
- Brazil
- Prior art keywords
- processes
- during drilling
- measurements based
- taking measurements
- accelerator during
- Prior art date
Links
- 238000005553 drilling Methods 0.000 title 1
- 238000005259 measurement Methods 0.000 title 1
- 238000000034 method Methods 0.000 title 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/10—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
- G01V5/104—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting secondary Y-rays as well as reflected or back-scattered neutrons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/10—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
- G01V5/101—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting the secondary Y-rays produced in the surrounding layers of the bore hole
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/10—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
- G01V5/107—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting reflected or back-scattered neutrons
Landscapes
- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Geophysics And Detection Of Objects (AREA)
- Electrostatic Spraying Apparatus (AREA)
- Measurement Of Radiation (AREA)
- Measuring Fluid Pressure (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/307,894 US5539225A (en) | 1994-09-16 | 1994-09-16 | Accelerator-based methods and apparatus for measurement-while-drilling |
| PCT/US1995/011442 WO1996008733A1 (en) | 1994-09-16 | 1995-09-11 | Accelerator-base methods and apparatus for measurement-while-drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BR9508924A true BR9508924A (pt) | 1997-10-28 |
Family
ID=23191622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BR9508924A BR9508924A (pt) | 1994-09-16 | 1995-09-11 | Processos e aparelho para realização de medidas com base em um acelerador durante a perfuração |
Country Status (12)
| Country | Link |
|---|---|
| US (2) | US5539225A (pt) |
| EP (1) | EP0781422B1 (pt) |
| JP (1) | JP3647460B2 (pt) |
| CN (1) | CN1122860C (pt) |
| AU (1) | AU689326B2 (pt) |
| BR (1) | BR9508924A (pt) |
| CA (1) | CA2199726C (pt) |
| DE (1) | DE69516525D1 (pt) |
| MX (1) | MX9701937A (pt) |
| MY (1) | MY114280A (pt) |
| NO (1) | NO318301B1 (pt) |
| WO (1) | WO1996008733A1 (pt) |
Families Citing this family (81)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5804820A (en) * | 1994-09-16 | 1998-09-08 | Schlumberger Technology Corporation | Method for determining density of an earth formation |
| US6703606B2 (en) | 2000-09-28 | 2004-03-09 | Schlumberger Technology Corporation | Neutron burst timing method and system for multiple measurement pulsed neutron formation evaluation |
| US6649906B2 (en) | 2000-09-29 | 2003-11-18 | Schlumberger Technology Corporation | Method and apparatus for safely operating radiation generators in while-drilling and while-tripping applications |
| US6526819B2 (en) | 2001-02-08 | 2003-03-04 | Weatherford/Lamb, Inc. | Method for analyzing a completion system |
| US6781115B2 (en) | 2001-03-30 | 2004-08-24 | Schlumberger Technology Corporation | Subsurface radiation phenomena detection with combined and azimuthally sensitive detectors |
| FR2824638B1 (fr) * | 2001-05-11 | 2003-07-04 | Schlumberger Services Petrol | Porte-outil pour moyens de mesure |
| US6571619B2 (en) * | 2001-10-11 | 2003-06-03 | Schlumberger Technology Corporation | Real time petrophysical evaluation system |
| US6738720B2 (en) * | 2001-11-29 | 2004-05-18 | Computalog U.S.A. | Apparatus and methods for measurement of density of materials using a neutron source and two spectrometers |
| US7129477B2 (en) * | 2002-04-03 | 2006-10-31 | Baker Hughes Incorporated | Method of processing data from a dual detector LWD density logging instrument coupled with an acoustic standoff measurement |
| US6884994B2 (en) * | 2002-09-19 | 2005-04-26 | Schlumberger Technology Corporation | High temperature scintillator |
| WO2004053472A1 (en) * | 2002-12-10 | 2004-06-24 | Commonwealth Scientific And Industrial Research Organisation A Body Corporate Established Under The Science And Industry Research Act 1949, As Amended, Carring On Scientific And Industrial Research | Radiographic equipment |
| US6944548B2 (en) | 2002-12-30 | 2005-09-13 | Schlumberger Technology Corporation | Formation evaluation through azimuthal measurements |
| ATE344930T1 (de) * | 2002-12-31 | 2006-11-15 | Schlumberger Services Petrol | Verfahren und vorrichtung zur spektroskopischen verarbeitung von daten im bohrloch |
| EP1435430B1 (en) | 2002-12-31 | 2007-03-28 | Services Petroliers Schlumberger | Measuring mud flow velocity using pulsed neutrons |
| US20040178337A1 (en) * | 2003-03-11 | 2004-09-16 | Baker Hughes Incorporated | Neutron detector for downhole use |
| US6754586B1 (en) * | 2003-03-28 | 2004-06-22 | Schlumberger Technology Corporation | Apparatus and methods for monitoring output from pulsed neutron sources |
| US7180826B2 (en) | 2004-10-01 | 2007-02-20 | Teledrill Inc. | Measurement while drilling bi-directional pulser operating in a near laminar annular flow channel |
| US7365307B2 (en) * | 2005-02-28 | 2008-04-29 | Schlumberger Technology Corporation | Sigma/porosity tools with neutron monitors |
| US7642507B2 (en) * | 2005-02-28 | 2010-01-05 | Schlumberger Technology Corporation | Apparatus and methods for interlaced density and neutron measurements |
| US7361886B2 (en) * | 2005-02-28 | 2008-04-22 | Schlumberger Technology Corporation | Corrections of gamma-ray responses |
| EP1917545B1 (en) * | 2005-07-26 | 2023-02-22 | Baker Hughes Holdings LLC | Measurement of formation gas pressure in cased wellbores using pulsed neutron instrumentation |
| US8522897B2 (en) | 2005-11-21 | 2013-09-03 | Schlumberger Technology Corporation | Lead the bit rotary steerable tool |
| US8360174B2 (en) | 2006-03-23 | 2013-01-29 | Schlumberger Technology Corporation | Lead the bit rotary steerable tool |
| EP1999342A4 (en) * | 2006-03-24 | 2014-11-05 | Services Petroliers Schlumberger | DRILLING TIP ASSEMBLY WITH A DRILLING MEASUREMENT DEVICE |
| GB2445159B (en) * | 2006-12-23 | 2009-11-18 | Schlumberger Holdings | Methods and systems for determining mud flow velocity from measurement of an amplitude of an artificially induced radiation |
| US8138943B2 (en) | 2007-01-25 | 2012-03-20 | David John Kusko | Measurement while drilling pulser with turbine power generation unit |
| US7657377B2 (en) * | 2007-05-31 | 2010-02-02 | Cbg Corporation | Azimuthal measurement-while-drilling (MWD) tool |
| US7408150B1 (en) | 2007-06-25 | 2008-08-05 | Schlumberger Technology Corporation | Well logging method for determining formation characteristics using pulsed neutron capture measurements |
| RU2481600C2 (ru) | 2007-08-08 | 2013-05-10 | Шлюмбергер Текнолоджи Б.В. | Генератор излучения и конфигурация источника питания для скважинных каротажных приборов |
| US8895914B2 (en) | 2007-08-10 | 2014-11-25 | Schlumberger Technology Corporation | Ruggedized neutron shields |
| US20090045329A1 (en) * | 2007-08-16 | 2009-02-19 | Schlumberger Technology Corporation | Downhole Tools Having Combined D-D and D-T Neutron Generators |
| US8642944B2 (en) * | 2007-08-31 | 2014-02-04 | Schlumberger Technology Corporation | Downhole tools with solid-state neutron monitors |
| US8049164B2 (en) * | 2007-11-07 | 2011-11-01 | Baker Hughes Incorporated | Azimuthal elemental imaging |
| US8269162B2 (en) * | 2007-11-07 | 2012-09-18 | Baker Hughes Incorporated | Azimuthal elemental imaging |
| US7880134B2 (en) * | 2007-11-07 | 2011-02-01 | Baker Hughes Incorporated | Azimuthal elemental imaging |
| GB2466901B (en) * | 2007-11-07 | 2012-10-24 | Baker Hughes Inc | Azimuthal elemental imaging |
| WO2009064899A2 (en) * | 2007-11-13 | 2009-05-22 | Halliburton Energy Services, Inc. | Downhole x-ray source fluid identification system and method |
| US7544929B1 (en) * | 2008-05-13 | 2009-06-09 | Precision Energy Services, Inc. | Borehole imaging and standoff determination using neutron measurements |
| EP2120066B1 (en) | 2008-05-16 | 2012-08-29 | Services Pétroliers Schlumberger | Neutron shielding for downhole tool |
| CN101598017B (zh) * | 2008-06-04 | 2012-10-31 | 中国石油集团钻井工程技术研究院 | 方位中子孔隙度随钻测量装置 |
| US10061055B2 (en) | 2008-06-25 | 2018-08-28 | Schlumberger Technology Corporation | Absolute elemental concentrations from nuclear spectroscopy |
| CA2729550C (en) * | 2008-06-25 | 2017-02-14 | Schlumberger Canada Limited | Absolute elemental concentrations from nuclear spectroscopy |
| EP2388624A3 (en) | 2008-06-27 | 2011-12-07 | Services Petroliers Schlumberger (SPS) | Determining downhole fluid flow |
| CN102159970B (zh) * | 2008-08-26 | 2014-12-10 | 普拉德研究及开发股份有限公司 | 在钻探期间确定地层水饱和度的方法和设备 |
| US8720572B2 (en) | 2008-12-17 | 2014-05-13 | Teledrill, Inc. | High pressure fast response sealing system for flow modulating devices |
| EP2241906B1 (en) | 2009-04-17 | 2015-04-01 | Services Pétroliers Schlumberger | Method of determining density of underground formations using neutron-gamma ray measurements |
| EP2275840B1 (en) | 2009-07-16 | 2013-09-25 | Services Pétroliers Schlumberger | Apparatus and methods for measuring formation characteristics |
| US8791407B2 (en) * | 2010-02-24 | 2014-07-29 | Halliburton Energy Services, Inc. | Gamma-gamma density measurement system for high-pressure, high-temperature measurements |
| WO2011106508A2 (en) * | 2010-02-25 | 2011-09-01 | Baker Hughes Incorporated | Method for hydrocarbon saturation and hydraulic frac placement |
| US8502135B2 (en) * | 2010-03-25 | 2013-08-06 | Baker Hughes Incorporated | Method for through-casing 3-phase saturation determination |
| US9372277B2 (en) * | 2010-04-21 | 2016-06-21 | Schlumberger Technology Corporation | Neutron porosity downhole tool with improved precision and reduced lithology effects |
| US9715035B2 (en) * | 2010-05-19 | 2017-07-25 | Schlumberger Technology Corporation | Pulse neutron formation gas identification with LWD measurements |
| US9304214B2 (en) * | 2010-06-30 | 2016-04-05 | Schlumberger Technology Corporation | Neutron detection using a shielded gamma detector |
| EP2548051A4 (en) * | 2010-06-30 | 2016-03-09 | Schlumberger Technology Bv | NEUTRON RECOGNITION BASED ON A BORONI-SHAPED GAMMA DETECTOR |
| ES2641845T3 (es) | 2011-04-04 | 2017-11-14 | Tokuyama Corporation | Centelleador, detector de radiación, y método para detectar radiación |
| WO2012138314A1 (en) | 2011-04-06 | 2012-10-11 | David John Kusko | Hydroelectric control valve for remote locations |
| US20130105679A1 (en) * | 2011-10-28 | 2013-05-02 | Ge Energy Oilfield Technology, Inc. | Dual gamma ray and neutron detector in a multi-sensor apparatus and related methods |
| CN102518431B (zh) * | 2011-12-26 | 2015-04-22 | 中国石油大学(华东) | 基于可控中子源的随钻多参数测井方法 |
| US9268055B2 (en) * | 2011-12-30 | 2016-02-23 | Schlumberger Technology Corporation | Well-logging apparatus including azimuthally spaced radiation detectors |
| US20140034822A1 (en) * | 2011-12-30 | 2014-02-06 | Schlumberger Technology Corporation | Well-logging apparatus including axially-spaced, noble gas-based detectors |
| US9052404B2 (en) | 2011-12-30 | 2015-06-09 | Schlumberger Technology Corporation | Well-logging apparatus including azimuthally-spaced, noble gas-based detectors |
| US9400340B2 (en) * | 2013-05-13 | 2016-07-26 | Baker Hughes Incorporated | Sourceless density measurements with neutron induced gamma normalization |
| US10379253B2 (en) | 2013-05-15 | 2019-08-13 | Schlumberger Technology Corporation | Borehole fluid effect correction for pulsed neutron porosity measurements |
| US10564311B2 (en) | 2013-09-30 | 2020-02-18 | Schlumberger Technology Corporation | Formation imaging using neutron activation |
| US20150241577A1 (en) * | 2013-12-19 | 2015-08-27 | Schlumberger Technology Corporation | Combined Epithermal And Thermal Neutron Detector And Its Application To Well Logging Instruments |
| EP2887104A1 (en) * | 2013-12-23 | 2015-06-24 | Services Pétroliers Schlumberger | Neutron-absorbing gamma ray window in a downhole tool |
| US9310515B2 (en) * | 2014-03-21 | 2016-04-12 | Schlumberger Technology Corporation | Method for using neutron interaction cross section to interpret neutron measurements |
| GB2542069B (en) | 2014-07-18 | 2020-09-02 | Halliburton Energy Services Inc | Formation density or acoustic impedance logging tool |
| US10466383B2 (en) | 2015-05-29 | 2019-11-05 | Schlumberger Technology Corporation | Method for using neutron interaction cross section to interpret neutron measurements |
| US9995842B2 (en) | 2015-05-29 | 2018-06-12 | Schlumberger Technology Corporation | Borehole fluid and/or casing effect correction for pulsed neutron measurements |
| EP3181807A1 (en) | 2015-12-18 | 2017-06-21 | Services Pétroliers Schlumberger | Downhole tool and method for imaging a wellbore |
| US10001582B2 (en) | 2016-02-04 | 2018-06-19 | Schlumberger Technology Corporation | Method for using pulsed neutron induced gamma ray measurements to determine formation properties |
| CN106374310B (zh) * | 2016-09-20 | 2019-05-31 | 贝兹维仪器(苏州)有限公司 | 一种下载手柄 |
| CN106321078B (zh) * | 2016-09-20 | 2023-03-24 | 贝兹维仪器(苏州)有限公司 | 一种数据下载装置 |
| AU2017398448B2 (en) * | 2017-02-08 | 2021-04-29 | Alex Stewart | Methods and means for azimuthal neutron porosity imaging of formation and cement volumes surrounding a borehole |
| RU2019128189A (ru) * | 2017-02-24 | 2021-03-24 | Филип ТЭАГ | Повышение разрешающей способности детектирования азимутального распределения материалов в условиях скважин с несколькими обсадными колоннами |
| AU2018225203B2 (en) * | 2017-02-27 | 2021-07-01 | Alex Stewart | Detecting anomalies in annular materials of single and dual casing string environments |
| JP2020511638A (ja) * | 2017-02-28 | 2020-04-16 | ティーグ、フィリップ | Ｘ線源を使用した非侵入地層密度の測定及び光電評価 |
| CA3121627A1 (en) * | 2018-12-07 | 2020-06-11 | Auburn University | Scanning mode application of neutron gamma analysis for soil carbon mapping |
| US11163089B2 (en) * | 2019-07-26 | 2021-11-02 | Schlumberger Technology Corporation | Neutron imaging devices for cased wells and open boreholes |
| US11940591B2 (en) * | 2020-08-07 | 2024-03-26 | Nabors Drilling Technologies Usa, Inc. | Gamma ray logging tool with detector window |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3435217A (en) * | 1965-06-28 | 1969-03-25 | Mobil Oil Corp | Production of chemistry-dependent gamma ray and thermal neutron logs corrected for porosity |
| US4501964A (en) * | 1981-08-03 | 1985-02-26 | Texaco Inc. | Borehole compensated oxygen activation nuclear well logging |
| US4596926A (en) * | 1983-03-11 | 1986-06-24 | Nl Industries, Inc. | Formation density logging using multiple detectors and sources |
| US4705944A (en) * | 1983-03-25 | 1987-11-10 | Nl Industries, Inc. | Formation density logging while drilling |
| US4760252A (en) * | 1983-06-28 | 1988-07-26 | Schlumberger Technology Corporation | Well logging tool with an accelerator neutron source |
| US4698501A (en) * | 1985-05-16 | 1987-10-06 | Nl Industries, Inc. | System for simultaneous gamma-gamma formation density logging while drilling |
| US4661700A (en) * | 1985-05-28 | 1987-04-28 | Schlumberger Technology Corporation | Well logging sonde with shielded collimated window |
| US4883956A (en) * | 1985-12-23 | 1989-11-28 | Schlumberger Technology Corporation | Methods and apparatus for gamma-ray spectroscopy and like measurements |
| AU593004B2 (en) * | 1986-06-05 | 1990-02-01 | Schlumberger Technology B.V. | A well logging tool with an accelerator neutron source |
| US4814609A (en) * | 1987-03-13 | 1989-03-21 | Schlumberger Technology Corporation | Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole |
| US4879463A (en) * | 1987-12-14 | 1989-11-07 | Schlumberger Technology Corporation | Method and apparatus for subsurface formation evaluation |
| US4972082A (en) * | 1989-03-16 | 1990-11-20 | Schlumberger Technology Corporation | Methods and apparatus for epithermal neutron logging |
| US5051581A (en) * | 1990-05-01 | 1991-09-24 | Schlumberger Technology Corporation | Method and apparatus for epithermal neutron porosity well logging |
| US5091644A (en) * | 1991-01-15 | 1992-02-25 | Teleco Oilfield Services Inc. | Method for analyzing formation data from a formation evaluation MWD logging tool |
| GB2252623B (en) * | 1991-01-15 | 1994-10-19 | Teleco Oilfield Services Inc | A method for analyzing formation data from a formation evaluation measurement while drilling logging tool |
| US5235285A (en) * | 1991-10-31 | 1993-08-10 | Schlumberger Technology Corporation | Well logging apparatus having toroidal induction antenna for measuring, while drilling, resistivity of earth formations |
| US5235185A (en) * | 1992-01-09 | 1993-08-10 | Schlumberger Technology Corporation | Formation sigma measurement from thermal neutron detection |
-
1994
- 1994-09-16 US US08/307,894 patent/US5539225A/en not_active Ceased
-
1995
- 1995-09-04 MY MYPI95002611A patent/MY114280A/en unknown
- 1995-09-11 CN CN95196200A patent/CN1122860C/zh not_active Expired - Lifetime
- 1995-09-11 CA CA002199726A patent/CA2199726C/en not_active Expired - Lifetime
- 1995-09-11 BR BR9508924A patent/BR9508924A/pt not_active IP Right Cessation
- 1995-09-11 JP JP51025896A patent/JP3647460B2/ja not_active Expired - Lifetime
- 1995-09-11 AU AU36287/95A patent/AU689326B2/en not_active Expired
- 1995-09-11 EP EP95933759A patent/EP0781422B1/en not_active Expired - Lifetime
- 1995-09-11 DE DE69516525T patent/DE69516525D1/de not_active Expired - Lifetime
- 1995-09-11 MX MX9701937A patent/MX9701937A/es unknown
- 1995-09-11 WO PCT/US1995/011442 patent/WO1996008733A1/en not_active Ceased
-
1996
- 1996-09-25 US US08/710,997 patent/USRE36012E/en not_active Expired - Lifetime
-
1997
- 1997-03-14 NO NO19971202A patent/NO318301B1/no not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1122860C (zh) | 2003-10-01 |
| MX9701937A (es) | 1997-06-28 |
| NO318301B1 (no) | 2005-02-28 |
| EP0781422B1 (en) | 2000-04-26 |
| EP0781422A1 (en) | 1997-07-02 |
| JP3647460B2 (ja) | 2005-05-11 |
| CA2199726C (en) | 2003-11-11 |
| AU3628795A (en) | 1996-03-29 |
| JPH11511845A (ja) | 1999-10-12 |
| AU689326B2 (en) | 1998-03-26 |
| NO971202D0 (no) | 1997-03-14 |
| USRE36012E (en) | 1998-12-29 |
| CA2199726A1 (en) | 1996-03-21 |
| MY114280A (en) | 2002-09-30 |
| WO1996008733A1 (en) | 1996-03-21 |
| CN1177402A (zh) | 1998-03-25 |
| NO971202L (no) | 1997-05-16 |
| US5539225A (en) | 1996-07-23 |
| DE69516525D1 (de) | 2000-05-31 |
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