WO2002076576A3 - Vapor deposition treated electret filter media - Google Patents

Vapor deposition treated electret filter media Download PDF

Info

Publication number
WO2002076576A3
WO2002076576A3 PCT/US2002/004944 US0204944W WO02076576A3 WO 2002076576 A3 WO2002076576 A3 WO 2002076576A3 US 0204944 W US0204944 W US 0204944W WO 02076576 A3 WO02076576 A3 WO 02076576A3
Authority
WO
WIPO (PCT)
Prior art keywords
filter media
electret filter
vapor deposition
mixtures
vapor phase
Prior art date
Application number
PCT/US2002/004944
Other languages
French (fr)
Other versions
WO2002076576A2 (en
Inventor
Richard E Gahan
Wai Ming Choi
Original Assignee
Hollingsworth & Vose 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
Application filed by Hollingsworth & Vose Co filed Critical Hollingsworth & Vose Co
Priority to EP02753757A priority Critical patent/EP1372814A2/en
Priority to CA002436236A priority patent/CA2436236C/en
Priority to JP2002575085A priority patent/JP2004533313A/en
Priority to AU2002306536A priority patent/AU2002306536A1/en
Publication of WO2002076576A2 publication Critical patent/WO2002076576A2/en
Publication of WO2002076576A3 publication Critical patent/WO2002076576A3/en

Links

Classifications

    • 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
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0414—Surface modifiers, e.g. comprising ion exchange groups
    • B01D2239/0428—Rendering the filter material hydrophobic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0435—Electret
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0471—Surface coating material
    • B01D2239/0478—Surface coating material on a layer of the filter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0622—Melt-blown
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1233—Fibre diameter
    • 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
    • Y10S55/00—Gas separation
    • Y10S55/39—Electrets separator

Abstract

A vapor phase treated electret filter media includes an additive or mixtures thereof that enhance the charge stability of the media. The filter media achives acceptable alpha values for a range of filtration challenges without significant decay in alpha values over time. Preferred charge additives include fatty acid amides and mixtures thereof. Exemplary vapor phase deposition monomers include fluorinated monomers.
PCT/US2002/004944 2001-03-21 2002-02-20 Vapor deposition treated electret filter media WO2002076576A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP02753757A EP1372814A2 (en) 2001-03-21 2002-02-20 Vapor deposition treated electret filter media
CA002436236A CA2436236C (en) 2001-03-21 2002-02-20 Vapor deposition treated electret filter media
JP2002575085A JP2004533313A (en) 2001-03-21 2002-02-20 Electret filter media after evaporation treatment
AU2002306536A AU2002306536A1 (en) 2001-03-21 2002-02-20 Vapor deposition treated electret filter media

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/813,548 2001-03-21
US09/813,548 US6802315B2 (en) 2001-03-21 2001-03-21 Vapor deposition treated electret filter media

Publications (2)

Publication Number Publication Date
WO2002076576A2 WO2002076576A2 (en) 2002-10-03
WO2002076576A3 true WO2002076576A3 (en) 2003-08-28

Family

ID=25212698

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/004944 WO2002076576A2 (en) 2001-03-21 2002-02-20 Vapor deposition treated electret filter media

Country Status (6)

Country Link
US (1) US6802315B2 (en)
EP (1) EP1372814A2 (en)
JP (1) JP2004533313A (en)
AU (1) AU2002306536A1 (en)
CA (1) CA2436236C (en)
WO (1) WO2002076576A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11565205B2 (en) 2014-03-08 2023-01-31 Hydac Fluidcarecenter Gmbh Method for adapting a filter medium to predefinable parameters and preferably a filter medium produced according to said method

Families Citing this family (67)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050118917A1 (en) * 2002-01-03 2005-06-02 Ahamad Khan Breathable non-wettable melt-blown non-woven materials and products employing the same
US20040028931A1 (en) 2002-06-26 2004-02-12 Bletsos Ioannis V. Coated sheet materials and packages made therewith
WO2004024292A2 (en) * 2002-09-16 2004-03-25 Triosyn Holding, Inc. Facemask with filtering closure
CN100557074C (en) * 2003-04-25 2009-11-04 亚利桑那西格玛实验室公司 The porous material of functionalized by vacuum deposition
US20060079145A1 (en) * 2004-10-13 2006-04-13 Hollingsworth & Vose Company Filter media with charge stabilizing and enhancing additives
ES2290614T3 (en) * 2004-12-23 2008-02-16 W.L. GORE & ASSOCIATES GMBH FILTER FOR THE AIR INPUT OF A TURBINE.
US7244292B2 (en) * 2005-05-02 2007-07-17 3M Innovative Properties Company Electret article having heteroatoms and low fluorosaturation ratio
US7244291B2 (en) * 2005-05-02 2007-07-17 3M Innovative Properties Company Electret article having high fluorosaturation ratio
US7553440B2 (en) * 2005-05-12 2009-06-30 Leonard William K Method and apparatus for electric treatment of substrates
US7651760B2 (en) * 2005-09-16 2010-01-26 Massachusetts Institute Of Technology Superhydrophobic fibers produced by electrospinning and chemical vapor deposition
US20070151216A1 (en) * 2006-01-04 2007-07-05 Daryl Charriere Gas filter for oven
JPWO2007111098A1 (en) 2006-03-24 2009-08-06 コニカミノルタエムジー株式会社 Transparent barrier sheet and method for producing the same
WO2007111092A1 (en) 2006-03-24 2007-10-04 Konica Minolta Medical & Graphic, Inc. Transparent barrier sheet and method for producing transparent barrier sheet
JPWO2007111075A1 (en) 2006-03-24 2009-08-06 コニカミノルタエムジー株式会社 Transparent barrier sheet and method for producing transparent barrier sheet
US20070240719A1 (en) * 2006-04-18 2007-10-18 Raul Duarte Portable air-purifying system
DE202007015659U1 (en) * 2007-11-08 2009-03-19 Mann+Hummel Gmbh Multi-layer, in particular two-stage filter element for cleaning a particle-containing medium
AU2008335536B2 (en) 2007-12-06 2011-11-17 3M Innovative Properties Company Electret webs with charge-enhancing additives
US20090156079A1 (en) * 2007-12-14 2009-06-18 Kimberly-Clark Worldwide, Inc. Antistatic breathable nonwoven laminate having improved barrier properties
WO2009093977A1 (en) * 2008-01-25 2009-07-30 Flodins Filter Aktiebolag Filter
CN101965228B (en) * 2008-02-29 2013-10-16 株式会社康井精机 Apparatus for production of composite material sheet
US7765698B2 (en) 2008-06-02 2010-08-03 3M Innovative Properties Company Method of making electret articles based on zeta potential
WO2009148744A2 (en) * 2008-06-02 2009-12-10 3M Innovative Properties Company Electret webs with charge-enhancing additives
GB0810326D0 (en) * 2008-06-06 2008-07-09 P2I Ltd Filtration media
KR101679894B1 (en) 2009-04-03 2016-11-25 쓰리엠 이노베이티브 프로퍼티즈 컴파니 Processing aids for olefinic webs, including electret webs
US20100252047A1 (en) 2009-04-03 2010-10-07 Kirk Seth M Remote fluorination of fibrous filter webs
KR101669306B1 (en) * 2009-04-03 2016-10-25 쓰리엠 이노베이티브 프로퍼티즈 컴파니 Electret webs with charge-enhancing additives
US8083828B2 (en) * 2009-06-19 2011-12-27 Hollingsworth & Vose Company Fiber web having a high stiffness
EP2283901B1 (en) * 2009-08-14 2013-01-02 Moldex-Metric AG & Co. KG Filter material and respirator mask
EP2609238B1 (en) * 2010-08-23 2016-12-07 Fiberweb Holdings Limited Nonwoven web and fibers with electret properties, manufacturing processes thereof and their use
JP2014504198A (en) 2010-10-25 2014-02-20 チャップマン、リック、エル Filtration materials using strategically formed fibers and / or fiber mixtures containing charge control agents
US8840970B2 (en) * 2011-01-16 2014-09-23 Sigma Laboratories Of Arizona, Llc Self-assembled functional layers in multilayer structures
US20120248034A1 (en) * 2011-04-01 2012-10-04 Lydall, Inc. Methods of making and using liquid filter media
DE102012020615A1 (en) * 2012-10-19 2014-04-24 Hydac Filtertechnik Gmbh Process for the surface treatment of a filter medium
US9149749B2 (en) 2012-11-13 2015-10-06 Hollingsworth & Vose Company Pre-coalescing multi-layered filter media
US9149748B2 (en) 2012-11-13 2015-10-06 Hollingsworth & Vose Company Multi-layered filter media
US11090590B2 (en) 2012-11-13 2021-08-17 Hollingsworth & Vose Company Pre-coalescing multi-layered filter media
RU2606611C1 (en) 2012-12-28 2017-01-10 3М Инновейтив Пропертиз Компани Electret fabrics with additives promoting accumulation of charge
WO2014172308A2 (en) 2013-04-19 2014-10-23 3M Innovative Properties Company Electret webs with charge-enhancing additives
JP2015200058A (en) * 2014-04-04 2015-11-12 東洋紡株式会社 electret
CN106165040B (en) * 2014-04-04 2019-01-22 东洋纺株式会社 electret
US10399024B2 (en) 2014-05-15 2019-09-03 Hollingsworth & Vose Company Surface modified filter media
US10195542B2 (en) 2014-05-15 2019-02-05 Hollingsworth & Vose Company Surface modified filter media
CN111939678A (en) * 2014-05-15 2020-11-17 霍林斯沃思和沃斯有限公司 Pre-coalesced multi-layer filter media
PL3157650T3 (en) 2014-06-23 2018-08-31 3M Innovative Properties Co Electret webs with charge-enhancing additives
US10744435B2 (en) * 2014-07-30 2020-08-18 Sabic Global Technologies B.V. Spunbond polycarbonate resin filter media
US10828587B2 (en) 2015-04-17 2020-11-10 Hollingsworth & Vose Company Stable filter media including nanofibers
JP6975705B2 (en) 2015-07-07 2021-12-01 スリーエム イノベイティブ プロパティズ カンパニー Substituted benzotriazole phenol
WO2017007677A1 (en) 2015-07-07 2017-01-12 3M Innovative Properties Company Substituted benzotriazole phenolate salts and antioxidant compositions formed therefrom
EP3320135B1 (en) 2015-07-07 2019-08-28 3M Innovative Properties Company Electret webs with charge-enhancing additives
KR20180027536A (en) 2015-07-07 2018-03-14 쓰리엠 이노베이티브 프로퍼티즈 캄파니 Polymer matrix with ionic additive
CN108136298B (en) * 2015-10-02 2020-08-28 东洋纺株式会社 Electret and electret filter material
US11014030B2 (en) 2016-02-17 2021-05-25 Hollingsworth & Vose Company Filter media including flame retardant fibers
US10252200B2 (en) 2016-02-17 2019-04-09 Hollingsworth & Vose Company Filter media including a filtration layer comprising synthetic fibers
US10625196B2 (en) 2016-05-31 2020-04-21 Hollingsworth & Vose Company Coalescing filter media
JP7076718B2 (en) 2017-01-05 2022-05-30 スリーエム イノベイティブ プロパティズ カンパニー Electret web with charge-enhancing additives
CN107081008B (en) * 2017-04-07 2019-05-31 深圳市新纶科技股份有限公司 Polyolefin film-fibre and preparation method and electret air filtering material prepared therefrom
CN109280205B (en) * 2018-10-26 2020-11-27 南京科技职业学院 Preparation method of polytetrafluoroethylene double-hydrophobic membrane
EP4045166B1 (en) 2019-10-16 2023-11-29 3M Innovative Properties Company Substituted benzimidazole melt additives
EP4045167A1 (en) 2019-10-16 2022-08-24 3M Innovative Properties Company Dual-function melt additives
EP4069898B1 (en) 2019-12-03 2023-06-21 3M Innovative Properties Company Thiolate salt melt additives
US20220401862A1 (en) 2019-12-03 2022-12-22 3M Innovative Properties Company Aromatic-heterocyclic ring melt additives
US20230067250A1 (en) 2020-01-27 2023-03-02 3M Innovative Properties Company Substituted thiol melt additives
CN115427622B (en) 2020-01-27 2023-09-15 3M创新有限公司 Substituted thiolate melt additives
WO2022034437A1 (en) 2020-08-11 2022-02-17 3M Innovative Properties Company Electret webs with carboxylic acid or carboxylate salt charge-enhancing additives
WO2022034444A1 (en) 2020-08-11 2022-02-17 3M Innovative Properties Company Electret webs with benzoate salt charge-enhancing additives
EP4237601A1 (en) 2020-11-02 2023-09-06 3M Innovative Properties Company Core-sheath fibers, nonwoven fibrous web, and filtering articles including the same
EP4263695A1 (en) 2020-12-18 2023-10-25 3M Innovative Properties Company Electrets comprising a substituted cyclotriphosphazene compound and articles therefrom

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1080649A (en) * 1963-11-21 1967-08-23 Nat Distillers Chem Corp Method to increase adhesion of a polyolefin coating to substrates
US5110620A (en) * 1987-11-28 1992-05-05 Toyo Boseki Kabushiki Kaisha Method for the production of an electret sheet
JPH0647218A (en) * 1992-07-30 1994-02-22 Kureha Chem Ind Co Ltd Mesh electret and its manufacture
JPH07227510A (en) * 1994-02-17 1995-08-29 Nitto Denko Corp Electret filter
US5964926A (en) * 1996-12-06 1999-10-12 Kimberly-Clark Worldwide, Inc. Gas born particulate filter and method of making
WO2000078430A2 (en) * 1999-06-17 2000-12-28 Hollingsworth & Vose Company Charge stabilized electret filter media
WO2001007144A2 (en) * 1999-07-21 2001-02-01 Hollingsworth & Vose Co Plasma treated electret filter media

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264750A (en) 1979-08-01 1981-04-28 Massachusetts Institute Of Technology Process for fluorinating polymers
CA1141020A (en) * 1979-10-19 1983-02-08 Slawomir W. Sapieha Electrets from plasma polymerized material
US4404256A (en) 1980-03-26 1983-09-13 Massachusetts Institute Of Technology Surface fluorinated polymers
US5034265A (en) 1983-08-01 1991-07-23 Washington Research Foundation Plasma gas discharge treatment for improving the compatibility of biomaterials
US4513349A (en) 1983-12-19 1985-04-23 General Electric Company Acrylate-containing mixed ester monomers and polymers thereof useful as capacitor dielectrics
US4533710A (en) 1983-12-19 1985-08-06 General Electric Company 1,2-Alkanediol diacrylate monomers and polymers thereof useful as capacitor dielectrics
US4842893A (en) 1983-12-19 1989-06-27 Spectrum Control, Inc. High speed process for coating substrates
US4515931A (en) 1983-12-19 1985-05-07 General Electric Company Polyfunctional acrylate monomers and polymers thereof useful as capacitor dielectrics
US4647818A (en) 1984-04-16 1987-03-03 Sfe Technologies Nonthermionic hollow anode gas discharge electron beam source
EP0242460A1 (en) 1985-01-18 1987-10-28 SPECTRUM CONTROL, INC. (a Pennsylvania corporation) Monomer atomizer for vaporization
US4954371A (en) 1986-06-23 1990-09-04 Spectrum Control, Inc. Flash evaporation of monomer fluids
US5025052A (en) * 1986-09-12 1991-06-18 Minnesota Mining And Manufacturing Company Fluorochemical oxazolidinones
US5090985A (en) 1989-10-17 1992-02-25 Libbey-Owens-Ford Co. Method for preparing vaporized reactants for chemical vapor deposition
US5224441A (en) 1991-09-27 1993-07-06 The Boc Group, Inc. Apparatus for rapid plasma treatments and method
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
AU669420B2 (en) * 1993-03-26 1996-06-06 Minnesota Mining And Manufacturing Company Oily mist resistant electret filter media
US5514246A (en) 1994-06-02 1996-05-07 Micron Technology, Inc. Plasma reactors and method of cleaning a plasma reactor
DE9414040U1 (en) * 1994-08-30 1995-01-19 Hoechst Ag Nonwovens made from electret fiber blends with improved charge stability
US5645627A (en) * 1995-02-28 1997-07-08 Hollingsworth & Vose Company Charge stabilized electret filter media
US5908598A (en) * 1995-08-14 1999-06-01 Minnesota Mining And Manufacturing Company Fibrous webs having enhanced electret properties
JP3566477B2 (en) * 1996-12-26 2004-09-15 興研株式会社 Electrostatic filter
US6238466B1 (en) * 1997-10-01 2001-05-29 3M Innovative Properties Company Electret articles and filters with increased oily mist resistance
US6432175B1 (en) 1998-07-02 2002-08-13 3M Innovative Properties Company Fluorinated electret
US6288157B1 (en) * 1999-05-11 2001-09-11 3M Innovative Properties Company Alkylated fluorochemical oligomers and use thereof
US20010039879A1 (en) * 1999-12-16 2001-11-15 Chapman Rick L. Charged filter media containing charge control agents
US6524360B2 (en) * 2000-02-15 2003-02-25 Hollingsworth & Vose Company Melt blown composite HEPA filter media and vacuum bag
US6419871B1 (en) * 2000-05-25 2002-07-16 Transweb, Llc. Plasma treatment of filter media

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1080649A (en) * 1963-11-21 1967-08-23 Nat Distillers Chem Corp Method to increase adhesion of a polyolefin coating to substrates
US5110620A (en) * 1987-11-28 1992-05-05 Toyo Boseki Kabushiki Kaisha Method for the production of an electret sheet
JPH0647218A (en) * 1992-07-30 1994-02-22 Kureha Chem Ind Co Ltd Mesh electret and its manufacture
JPH07227510A (en) * 1994-02-17 1995-08-29 Nitto Denko Corp Electret filter
US5964926A (en) * 1996-12-06 1999-10-12 Kimberly-Clark Worldwide, Inc. Gas born particulate filter and method of making
WO2000078430A2 (en) * 1999-06-17 2000-12-28 Hollingsworth & Vose Company Charge stabilized electret filter media
WO2001007144A2 (en) * 1999-07-21 2001-02-01 Hollingsworth & Vose Co Plasma treated electret filter media

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 276 (C - 1204) 26 May 1994 (1994-05-26) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 11 26 December 1995 (1995-12-26) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11565205B2 (en) 2014-03-08 2023-01-31 Hydac Fluidcarecenter Gmbh Method for adapting a filter medium to predefinable parameters and preferably a filter medium produced according to said method

Also Published As

Publication number Publication date
JP2004533313A (en) 2004-11-04
AU2002306536A1 (en) 2002-10-08
CA2436236C (en) 2007-07-10
CA2436236A1 (en) 2002-10-03
US20020174869A1 (en) 2002-11-28
WO2002076576A2 (en) 2002-10-03
EP1372814A2 (en) 2004-01-02
US6802315B2 (en) 2004-10-12

Similar Documents

Publication Publication Date Title
WO2002076576A3 (en) Vapor deposition treated electret filter media
WO2001068658A3 (en) Melt blown composite hepa vacuum filter
AU2003286657A8 (en) Filters and methods of making and using the same
HK1074020A1 (en) Microporous filter media, filtration systems containing same, and methods of making and using
DE69416241D1 (en) Abrasives, process for its manufacture and process for its use
EP1355715A4 (en) Filter apparatus and methods
AU2002239590A1 (en) Digital media recognition apparatus and methods
DE69632841D1 (en) Process for the preparation of fluorinated nitriles from the corresponding amides
DE69417538D1 (en) MALEIC ACID COPOLYMER, METHOD FOR THE PRODUCTION AND USE THEREOF
AU2002220769A1 (en) Method and device for cleaning the barrel of the gun
DE60113459D1 (en) COIL FILTER AND METHOD FOR THE PRODUCTION THEREOF
DE69214505T2 (en) Process for manufacturing an electret filter
AU2001253743A1 (en) Vertical filter and method
AU4136901A (en) Novel methods for the treatment and prevention of dizziness and pruritus
PL349936A1 (en) Methods of chemically modifying surfaces of emulsion polymer particles
AU2003252132A1 (en) Polymeric surface treatment of filter media
AU2003241748A1 (en) Electret filter and process for producing the same
DE60015658D1 (en) Process for the preparation of perhalogenated chlorotrifluoroethylene copolymers
IL150600A (en) Process for the preparation of compounds containing one or more amide bonds using an excess of an activated carboxylic component and scavenging the residual activated carboxylic component
AU2002213413A1 (en) Process and apparatus for improving the security of digital signatures
WO2000078430A3 (en) Charge stabilized electret filter media
AU2002237560A1 (en) High rate filter and high rate filtration method using the filter
WO2001007144A8 (en) Plasma treated electret filter media
SG96274A1 (en) Disk apparatus and filter for disk apparatus
DE69710405T2 (en) Process for the preparation of primary amide derivatives

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG UZ VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: 2436236

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: 2002753757

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2002575085

Country of ref document: JP

WWP Wipo information: published in national office

Ref document number: 2002753757

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642