CA2334294A1 - Filter having a change indicator - Google Patents

Filter having a change indicator Download PDF

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Publication number
CA2334294A1
CA2334294A1 CA002334294A CA2334294A CA2334294A1 CA 2334294 A1 CA2334294 A1 CA 2334294A1 CA 002334294 A CA002334294 A CA 002334294A CA 2334294 A CA2334294 A CA 2334294A CA 2334294 A1 CA2334294 A1 CA 2334294A1
Authority
CA
Canada
Prior art keywords
filter
change indicator
air
contaminants
accumulation
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
CA002334294A
Other languages
French (fr)
Other versions
CA2334294C (en
Inventor
James O. Kubokawa
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.)
3M Co
Original Assignee
Minnesota Mining And Manufacturing Company
James O. Kubokawa
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
Application filed by Minnesota Mining And Manufacturing Company, James O. Kubokawa filed Critical Minnesota Mining And Manufacturing Company
Publication of CA2334294A1 publication Critical patent/CA2334294A1/en
Application granted granted Critical
Publication of CA2334294C publication Critical patent/CA2334294C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0086—Filter condition indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/30—Porosity of filtering material
    • B01D2275/302—Means for changing the porosity of a filter element, e.g. adjustment of a slit width, compression of a foam material

Abstract

Disclosed is a change indicator (30) for a filter (10) for use in a gaseous circulation system, such as a forced air heating and cooling system.
The change indicator includes an air impervious patch (32) that is secured to the filter. The portion of the filter media (12) adjacent to the change indicator changes appearance in response to the accumulation of contaminants at a much slower rate than the remainder of the air filter. The accumulation of contaminants progresses inwardly from the region adjacent the periphery of the change indicator towards the region adjacent to the center. Once the appearance of the filter media beneath the change indicator fully changes from periphery to the center, that is an indication that the air filter is in need of cleaning or replacement.
CA002334294A 1998-07-14 1999-02-12 Filter having a change indicator Expired - Lifetime CA2334294C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/115,319 1998-07-14
US09/115,319 US6110260A (en) 1998-07-14 1998-07-14 Filter having a change indicator
PCT/US1999/003158 WO2000003787A1 (en) 1998-07-14 1999-02-12 Filter having a change indicator

Publications (2)

Publication Number Publication Date
CA2334294A1 true CA2334294A1 (en) 2000-01-27
CA2334294C CA2334294C (en) 2007-06-26

Family

ID=22360608

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002334294A Expired - Lifetime CA2334294C (en) 1998-07-14 1999-02-12 Filter having a change indicator

Country Status (5)

Country Link
US (1) US6110260A (en)
JP (1) JP2002520147A (en)
AU (1) AU2678599A (en)
CA (1) CA2334294C (en)
WO (1) WO2000003787A1 (en)

Families Citing this family (99)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6513184B1 (en) * 2000-06-28 2003-02-04 S. C. Johnson & Son, Inc. Particle entrapment system
US6734801B2 (en) * 2002-06-26 2004-05-11 Lucent Technologies Inc. Switch frame electronic air filter alarming device
US6979361B2 (en) * 2002-07-17 2005-12-27 Gueorgui Milev Mihayiov End of service life indicator for fluid filter
US6875249B2 (en) * 2002-10-08 2005-04-05 Donaldson Company, Inc. Motor vehicle filter structure having visual indicator of useful life
US6800106B2 (en) * 2003-02-25 2004-10-05 William K. Cogar, Sr. Thermochromic filter apparatus for computer
US7412842B2 (en) 2004-04-27 2008-08-19 Emerson Climate Technologies, Inc. Compressor diagnostic and protection system
US7141101B2 (en) * 2004-06-17 2006-11-28 Home Health Medical Equipment Incorporated Filter assembly with noise attenuation
US7424343B2 (en) * 2004-08-11 2008-09-09 Lawrence Kates Method and apparatus for load reduction in an electric power system
EP1781996A2 (en) * 2004-08-11 2007-05-09 Lawrence Kates Method and apparatus for monitoring refrigerant-cycle systems
US7275377B2 (en) * 2004-08-11 2007-10-02 Lawrence Kates Method and apparatus for monitoring refrigerant-cycle systems
US20060096261A1 (en) * 2004-11-09 2006-05-11 Dong Zhang Air duct filter assembly with identical and color coded air filter
US7253743B2 (en) * 2005-02-07 2007-08-07 Cisco Technology, Inc. Techniques for identifying when to change an air filter
US7757340B2 (en) 2005-03-25 2010-07-20 S.C. Johnson & Son, Inc. Soft-surface remediation device and method of using same
US9120043B2 (en) * 2006-05-30 2015-09-01 3M Innovative Properties Company Filter sensor
US7621978B2 (en) * 2006-05-30 2009-11-24 3M Innovative Properties Company Filter timer
US8590325B2 (en) 2006-07-19 2013-11-26 Emerson Climate Technologies, Inc. Protection and diagnostic module for a refrigeration system
US20080216494A1 (en) 2006-09-07 2008-09-11 Pham Hung M Compressor data module
US8021618B1 (en) 2006-09-19 2011-09-20 Cooper Nathan R Filter with change indicator
US8029608B1 (en) 2006-12-13 2011-10-04 BD Technology Partners Furnace filter indicator
US20090037142A1 (en) 2007-07-30 2009-02-05 Lawrence Kates Portable method and apparatus for monitoring refrigerant-cycle systems
US9140728B2 (en) 2007-11-02 2015-09-22 Emerson Climate Technologies, Inc. Compressor sensor module
US11434068B2 (en) 2008-09-24 2022-09-06 Restaurant Technologies, Inc. Flame resistant filter apparatus and method
US8694164B2 (en) 2008-10-27 2014-04-08 Lennox Industries, Inc. Interactive user guidance interface for a heating, ventilation and air conditioning system
US8600558B2 (en) 2008-10-27 2013-12-03 Lennox Industries Inc. System recovery in a heating, ventilation and air conditioning network
US8874815B2 (en) 2008-10-27 2014-10-28 Lennox Industries, Inc. Communication protocol system and method for a distributed architecture heating, ventilation and air conditioning network
US8452906B2 (en) 2008-10-27 2013-05-28 Lennox Industries, Inc. Communication protocol system and method for a distributed-architecture heating, ventilation and air conditioning network
US8548630B2 (en) 2008-10-27 2013-10-01 Lennox Industries, Inc. Alarm and diagnostics system and method for a distributed-architecture heating, ventilation and air conditioning network
US8442693B2 (en) 2008-10-27 2013-05-14 Lennox Industries, Inc. System and method of use for a user interface dashboard of a heating, ventilation and air conditioning network
US9152155B2 (en) 2008-10-27 2015-10-06 Lennox Industries Inc. Device abstraction system and method for a distributed-architecture heating, ventilation and air conditioning system
US8437878B2 (en) 2008-10-27 2013-05-07 Lennox Industries Inc. Alarm and diagnostics system and method for a distributed architecture heating, ventilation and air conditioning network
US8433446B2 (en) 2008-10-27 2013-04-30 Lennox Industries, Inc. Alarm and diagnostics system and method for a distributed-architecture heating, ventilation and air conditioning network
US9432208B2 (en) 2008-10-27 2016-08-30 Lennox Industries Inc. Device abstraction system and method for a distributed architecture heating, ventilation and air conditioning system
US8352080B2 (en) 2008-10-27 2013-01-08 Lennox Industries Inc. Communication protocol system and method for a distributed-architecture heating, ventilation and air conditioning network
US9678486B2 (en) 2008-10-27 2017-06-13 Lennox Industries Inc. Device abstraction system and method for a distributed-architecture heating, ventilation and air conditioning system
US8295981B2 (en) 2008-10-27 2012-10-23 Lennox Industries Inc. Device commissioning in a heating, ventilation and air conditioning network
US8977794B2 (en) 2008-10-27 2015-03-10 Lennox Industries, Inc. Communication protocol system and method for a distributed-architecture heating, ventilation and air conditioning network
US8802981B2 (en) 2008-10-27 2014-08-12 Lennox Industries Inc. Flush wall mount thermostat and in-set mounting plate for a heating, ventilation and air conditioning system
US8788100B2 (en) 2008-10-27 2014-07-22 Lennox Industries Inc. System and method for zoning a distributed-architecture heating, ventilation and air conditioning network
US8892797B2 (en) 2008-10-27 2014-11-18 Lennox Industries Inc. Communication protocol system and method for a distributed-architecture heating, ventilation and air conditioning network
US8661165B2 (en) 2008-10-27 2014-02-25 Lennox Industries, Inc. Device abstraction system and method for a distributed architecture heating, ventilation and air conditioning system
US8352081B2 (en) 2008-10-27 2013-01-08 Lennox Industries Inc. Communication protocol system and method for a distributed-architecture heating, ventilation and air conditioning network
US9261888B2 (en) 2008-10-27 2016-02-16 Lennox Industries Inc. System and method of use for a user interface dashboard of a heating, ventilation and air conditioning network
US8452456B2 (en) 2008-10-27 2013-05-28 Lennox Industries Inc. System and method of use for a user interface dashboard of a heating, ventilation and air conditioning network
US9268345B2 (en) 2008-10-27 2016-02-23 Lennox Industries Inc. System and method of use for a user interface dashboard of a heating, ventilation and air conditioning network
US8855825B2 (en) 2008-10-27 2014-10-07 Lennox Industries Inc. Device abstraction system and method for a distributed-architecture heating, ventilation and air conditioning system
US8994539B2 (en) 2008-10-27 2015-03-31 Lennox Industries, Inc. Alarm and diagnostics system and method for a distributed-architecture heating, ventilation and air conditioning network
US9325517B2 (en) 2008-10-27 2016-04-26 Lennox Industries Inc. Device abstraction system and method for a distributed-architecture heating, ventilation and air conditioning system
US8798796B2 (en) 2008-10-27 2014-08-05 Lennox Industries Inc. General control techniques in a heating, ventilation and air conditioning network
US8255086B2 (en) 2008-10-27 2012-08-28 Lennox Industries Inc. System recovery in a heating, ventilation and air conditioning network
US8437877B2 (en) 2008-10-27 2013-05-07 Lennox Industries Inc. System recovery in a heating, ventilation and air conditioning network
US8762666B2 (en) 2008-10-27 2014-06-24 Lennox Industries, Inc. Backup and restoration of operation control data in a heating, ventilation and air conditioning network
US8655491B2 (en) 2008-10-27 2014-02-18 Lennox Industries Inc. Alarm and diagnostics system and method for a distributed architecture heating, ventilation and air conditioning network
US9651925B2 (en) 2008-10-27 2017-05-16 Lennox Industries Inc. System and method for zoning a distributed-architecture heating, ventilation and air conditioning network
US8655490B2 (en) 2008-10-27 2014-02-18 Lennox Industries, Inc. System and method of use for a user interface dashboard of a heating, ventilation and air conditioning network
US8560125B2 (en) 2008-10-27 2013-10-15 Lennox Industries Communication protocol system and method for a distributed-architecture heating, ventilation and air conditioning network
US8463442B2 (en) 2008-10-27 2013-06-11 Lennox Industries, Inc. Alarm and diagnostics system and method for a distributed architecture heating, ventilation and air conditioning network
US8543243B2 (en) 2008-10-27 2013-09-24 Lennox Industries, Inc. System and method of use for a user interface dashboard of a heating, ventilation and air conditioning network
US9377768B2 (en) 2008-10-27 2016-06-28 Lennox Industries Inc. Memory recovery scheme and data structure in a heating, ventilation and air conditioning network
US8725298B2 (en) 2008-10-27 2014-05-13 Lennox Industries, Inc. Alarm and diagnostics system and method for a distributed architecture heating, ventilation and conditioning network
US8774210B2 (en) 2008-10-27 2014-07-08 Lennox Industries, Inc. Communication protocol system and method for a distributed-architecture heating, ventilation and air conditioning network
US8463443B2 (en) 2008-10-27 2013-06-11 Lennox Industries, Inc. Memory recovery scheme and data structure in a heating, ventilation and air conditioning network
US8744629B2 (en) 2008-10-27 2014-06-03 Lennox Industries Inc. System and method of use for a user interface dashboard of a heating, ventilation and air conditioning network
US8615326B2 (en) 2008-10-27 2013-12-24 Lennox Industries Inc. System and method of use for a user interface dashboard of a heating, ventilation and air conditioning network
US8239066B2 (en) 2008-10-27 2012-08-07 Lennox Industries Inc. System and method of use for a user interface dashboard of a heating, ventilation and air conditioning network
US8600559B2 (en) 2008-10-27 2013-12-03 Lennox Industries Inc. Method of controlling equipment in a heating, ventilation and air conditioning network
US8564400B2 (en) 2008-10-27 2013-10-22 Lennox Industries, Inc. Communication protocol system and method for a distributed-architecture heating, ventilation and air conditioning network
US9632490B2 (en) 2008-10-27 2017-04-25 Lennox Industries Inc. System and method for zoning a distributed architecture heating, ventilation and air conditioning network
US9333450B2 (en) 2009-04-06 2016-05-10 Travis Hamlin HVAC register filter and method of using the same
US20100251893A1 (en) * 2009-04-06 2010-10-07 Travis Alan Hamlin HVAC Register Filter and Method of Using the Same
US8097067B2 (en) * 2009-05-06 2012-01-17 3M Innovative Properties Company Runtime sensor for small forced air handling units
USD648641S1 (en) 2009-10-21 2011-11-15 Lennox Industries Inc. Thin cover plate for an electronic system controller
USD648642S1 (en) 2009-10-21 2011-11-15 Lennox Industries Inc. Thin cover plate for an electronic system controller
US8260444B2 (en) 2010-02-17 2012-09-04 Lennox Industries Inc. Auxiliary controller of a HVAC system
CN105910247B (en) 2011-02-28 2018-12-14 艾默生电气公司 The monitoring and diagnosis of the HVAC of house solution
US20110315019A1 (en) * 2011-07-18 2011-12-29 Kent Lyon Hvac return air system actuator device
JP5864237B2 (en) * 2011-12-08 2016-02-17 東洋アルミエコープロダクツ株式会社 Filter mounting seal and filter structure
US8964338B2 (en) 2012-01-11 2015-02-24 Emerson Climate Technologies, Inc. System and method for compressor motor protection
RU2488426C1 (en) * 2012-07-05 2013-07-27 Игорь Владимирович Копиевский Bag filtration element with filter bag and method of its attachment to tube plate
US10071331B2 (en) * 2012-09-12 2018-09-11 Camfil Ab Backing net structure
US9310439B2 (en) 2012-09-25 2016-04-12 Emerson Climate Technologies, Inc. Compressor having a control and diagnostic module
WO2014144446A1 (en) 2013-03-15 2014-09-18 Emerson Electric Co. Hvac system remote monitoring and diagnosis
US9551504B2 (en) 2013-03-15 2017-01-24 Emerson Electric Co. HVAC system remote monitoring and diagnosis
US9803902B2 (en) 2013-03-15 2017-10-31 Emerson Climate Technologies, Inc. System for refrigerant charge verification using two condenser coil temperatures
CN106030221B (en) 2013-04-05 2018-12-07 艾默生环境优化技术有限公司 Heat pump system with refrigerant charging diagnostic function
US20180207569A1 (en) * 2013-06-14 2018-07-26 Jordan Salpietra Systems and methods of indicating filter life
US20150027314A1 (en) * 2013-07-25 2015-01-29 Gregory T. Kavounas Air filter apparatus with adhesive air filter (adaf) and components for air purification, and systems using the same
CA2933340C (en) * 2013-12-17 2022-05-31 3M Innovative Properties Company Air quality indicator
US9532689B2 (en) 2014-04-15 2017-01-03 Shop Vac Corporation Airflow indicator assembly and method for vacuum cleaner
US20150151234A1 (en) * 2015-01-17 2015-06-04 Gregory T. Kavounas Air filter having adhesive tape with adhesive side exposed to air flow
US9552715B2 (en) 2015-04-27 2017-01-24 BD Technology Partners Networked filter condition indicator
US10286349B2 (en) 2015-11-10 2019-05-14 3M Innovative Properties Company Air filter use indicators
US11213780B2 (en) * 2016-08-05 2022-01-04 3M Innovative Properties Company Air filter with passivated filter life indicator
US11027231B2 (en) * 2016-11-17 2021-06-08 3M Innovative Properties Company Air filter with visual filter life indicator zone and sorbent-loaded visual reference zone
KR20180083677A (en) * 2017-01-13 2018-07-23 주식회사 위닉스 Air cleaner
WO2018198001A2 (en) 2017-04-28 2018-11-01 3M Innovative Properties Company Air filtration monitoring based on thermoelectric devices
EP3721192A4 (en) 2017-12-08 2021-08-25 3M Innovative Properties Company Differential thermoelectric device
USD859184S1 (en) * 2017-12-11 2019-09-10 3M Innovative Properties Company Filter-borne sensor housing
EP3769013A1 (en) * 2018-03-21 2021-01-27 Restaurant Technologies, Inc. Systems and methods of indicating filter life
US20220047978A1 (en) * 2020-08-13 2022-02-17 Mann+Hummel Life Sciences & Environment Holding Singapore Pte. Ltd. Anti-microbial, anti-allergenic bio-functional air filter medium for residential air filtration and air filter element

Family Cites Families (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US30782A (en) * 1860-11-27 John wright
US31285A (en) * 1861-01-29 Making- finger-guards for harvesters
US2753831A (en) * 1952-05-10 1956-07-10 Walter B Davies Air filter clogging warning apparatus
US2721533A (en) * 1953-08-27 1955-10-25 Alderfer Donovan Cassel Pressure operated alarm
US2804839A (en) * 1954-12-14 1957-09-03 William W Hallinan Air filter alarm systems and air filter alarm units
US2782747A (en) * 1955-04-11 1957-02-26 Donovan C Alderfer Alarm for air conditioning system
US2849005A (en) * 1955-11-15 1958-08-26 Brown & Williamson Tobacco Emblematized cigarette filter tip
US3027865A (en) * 1959-01-06 1962-04-03 Honeywell Regulator Co Clogged filter indicator
FR1364148A (en) * 1963-05-10 1964-06-19 Desiccant cap
US3635001A (en) * 1969-08-05 1972-01-18 Nat Union Electric Corp Filter indicator
GB1407125A (en) * 1973-02-22 1975-09-24 Gen Motors Ltd Pressure responsive visual warning devices
NL160303C (en) 1974-03-25 1979-10-15 Verto Nv METHOD FOR MANUFACTURING A FIBER FILTER
US4103058A (en) * 1974-09-20 1978-07-25 Minnesota Mining And Manufacturing Company Pillowed web of blown microfibers
US4130487A (en) * 1976-04-05 1978-12-19 Process Scientific Innovations Ltd. Filters for liquids or gases
NL181632C (en) 1976-12-23 1987-10-01 Minnesota Mining & Mfg ELECTRIC FILTER AND METHOD FOR MANUFACTURING THAT.
US4215682A (en) * 1978-02-06 1980-08-05 Minnesota Mining And Manufacturing Company Melt-blown fibrous electrets
DE7809170U1 (en) * 1978-03-25 1978-07-27 Fa. Carl Freudenberg, 6940 Weinheim FILTER MAT
FR2480807A1 (en) * 1980-04-18 1981-10-23 Seplast Sa PROCESS FOR THE SUPERFICIAL TREATMENT OF A FIBROUS, NON-WOVEN AND VERY ACOUSTIC FILTERING LAYER, FORMING ELECTRET AND ITS APPLICATION TO FILTERS AND RESPIRATORY MASKS, IN PARTICULAR
US4321070A (en) * 1980-08-22 1982-03-23 Bede Industries, Inc. Whistle to signal clogged air filter
AU565762B2 (en) * 1983-02-04 1987-09-24 Minnesota Mining And Manufacturing Company Method and apparatus for manufacturing an electret filter medium
US4795668A (en) * 1983-10-11 1989-01-03 Minnesota Mining And Manufacturing Company Bicomponent fibers and webs made therefrom
US4547420A (en) * 1983-10-11 1985-10-15 Minnesota Mining And Manufacturing Company Bicomponent fibers and webs made therefrom
JPS60168511A (en) * 1984-02-10 1985-09-02 Japan Vilene Co Ltd Production of electret filter
IT207760Z2 (en) * 1986-04-07 1988-02-15 Ital Idee Srl VISUAL CONTROL DEVICE FOR THE CLOGGING LEVEL OF AN AIR FILTER IN MOTOR VEHICLE ENGINES
GB8612070D0 (en) * 1986-05-19 1986-06-25 Brown R C Blended-fibre filter material
US4747364A (en) * 1986-08-05 1988-05-31 Filter Alert Corporation Flow rate threshold sensor
US4988560A (en) * 1987-12-21 1991-01-29 Minnesota Mining And Manufacturing Company Oriented melt-blown fibers, processes for making such fibers, and webs made from such fibers
US4904174A (en) * 1988-09-15 1990-02-27 Peter Moosmayer Apparatus for electrically charging meltblown webs (B-001)
CH676087A5 (en) * 1988-10-25 1990-12-14 Periso S A Elektro Ind
US4955995A (en) * 1989-07-28 1990-09-11 Columbus Industries, Inc. Range hood filter pad
US5009308A (en) * 1989-08-09 1991-04-23 Multiform Desiccants, Inc. Controlled rate adsorbent unit and method of fabrication thereof
CA2027687C (en) * 1989-11-14 2002-12-31 Douglas C. Sundet Filtration media and method of manufacture
US5122048A (en) * 1990-09-24 1992-06-16 Exxon Chemical Patents Inc. Charging apparatus for meltblown webs
US5230800A (en) * 1992-02-20 1993-07-27 Minnesota Mining And Manufacturing Company Scrim inserted electrostatic fibrous filter web
US5401446A (en) * 1992-10-09 1995-03-28 The University Of Tennessee Research Corporation Method and apparatus for the electrostatic charging of a web or film
US5325707A (en) * 1993-03-08 1994-07-05 Slater Harry F Air filter condition indicator
ES2128590T3 (en) * 1993-08-17 1999-05-16 Minnesota Mining & Mfg METHOD FOR LOADING FILTERS WITH ELECTRETES.
DE4413148A1 (en) * 1994-04-15 1995-04-20 Daimler Benz Ag Filter loading indicator
US5505753A (en) * 1994-09-12 1996-04-09 Heysek; Ralph G. Aircraft pneumatic air filter
US5792242A (en) * 1996-02-26 1998-08-11 Minnesota Mining And Manufacturing Co. Electrostatic fibrous filter web
GB2311857A (en) * 1996-04-02 1997-10-08 Molyneux Shlosberg Lindsay Monitoring gas for particulates

Also Published As

Publication number Publication date
CA2334294C (en) 2007-06-26
US6110260A (en) 2000-08-29
WO2000003787A1 (en) 2000-01-27
AU2678599A (en) 2000-02-07
JP2002520147A (en) 2002-07-09

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