[go: up one dir, main page]

GB2013102A - A filter material and its manufacture - Google Patents

A filter material and its manufacture

Info

Publication number
GB2013102A
GB2013102A GB7827785A GB7827785A GB2013102A GB 2013102 A GB2013102 A GB 2013102A GB 7827785 A GB7827785 A GB 7827785A GB 7827785 A GB7827785 A GB 7827785A GB 2013102 A GB2013102 A GB 2013102A
Authority
GB
United Kingdom
Prior art keywords
adsorber
foam
grains
pores
filter material
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
GB7827785A
Other versions
GB2013102B (en
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.)
VON BLUECHER H
Original Assignee
VON BLUECHER H
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 VON BLUECHER H filed Critical VON BLUECHER H
Publication of GB2013102A publication Critical patent/GB2013102A/en
Application granted granted Critical
Publication of GB2013102B publication Critical patent/GB2013102B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28095—Shape or type of pores, voids, channels, ducts
    • B01J20/28097—Shape or type of pores, voids, channels, ducts being coated, filled or plugged with specific compounds
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B19/00—Cartridges with absorbing substances for respiratory apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • 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
    • B01D39/1669—Cellular material
    • B01D39/1676—Cellular material of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28004—Sorbent size or size distribution, e.g. particle size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28016—Particle form
    • B01J20/28019—Spherical, ellipsoidal or cylindrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28023—Fibres or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/2803—Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28042—Shaped bodies; Monolithic structures
    • B01J20/28045—Honeycomb or cellular structures; Solid foams or sponges
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Management (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Pulmonology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Filtering Materials (AREA)

Abstract

A filter material, for example for use in the construction of safety clothing, gas masks or the like is made of an open-pored foam polyurethane (1) with adsorber particles (2) adhered to the pore walls and porous adsorber grains (4) placed in the pores. In a process for making the material the adsorber grains are forced into the foam, which is wetted with water, by means of an air current. The foam may be reinforced by means of a fibre layer (5) to prevent distortion of the pores and possible escape of the adsorber grains therefrom. The adsorber is preferably active carbon made by carbonizing coagulated viscose drops. The material is stated to prevent passage of liquid droplets as well as vapours. <IMAGE>
GB7827785A 1978-01-31 1978-06-23 Filter material and a method and apparatus for making it Expired GB2013102B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782804154 DE2804154C2 (en) 1978-01-31 1978-01-31 Filter material and method and device for its manufacture

Publications (2)

Publication Number Publication Date
GB2013102A true GB2013102A (en) 1979-08-08
GB2013102B GB2013102B (en) 1982-06-30

Family

ID=6030820

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7827785A Expired GB2013102B (en) 1978-01-31 1978-06-23 Filter material and a method and apparatus for making it

Country Status (5)

Country Link
CA (1) CA1115679A (en)
CH (1) CH635519A5 (en)
DE (1) DE2804154C2 (en)
FR (1) FR2416044A1 (en)
GB (1) GB2013102B (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0031719A3 (en) * 1979-12-28 1981-07-22 Albany International Corporation Sorbent-loaded textile fibers and films and methods of fabricating the same
EP0036338A1 (en) * 1980-03-19 1981-09-23 Allan Henry Meny A regenerative, fluid filter
GB2138695A (en) * 1983-04-29 1984-10-31 Sorbexx Gmbh Filter element
GB2148740A (en) * 1983-10-31 1985-06-05 La Pena Michael De Gas treatment device
EP0238463A1 (en) * 1986-03-06 1987-09-23 Mediplast AB A device for absorption of carbon dioxide in a breathing apparatus
GB2238802A (en) * 1989-12-06 1991-06-12 Purification Prod Production of particulate solid-bearing air-permeable sheet materials
US5582865A (en) * 1988-12-12 1996-12-10 Extraction Systems, Inc. Non-woven filter composite
US5607647A (en) * 1993-12-02 1997-03-04 Extraction Systems, Inc. Air filtering within clean environments
US5626820A (en) * 1988-12-12 1997-05-06 Kinkead; Devon A. Clean room air filtering
WO2001091886A1 (en) * 2000-05-31 2001-12-06 Helsa-Werke Helmut Sandler Gmbh & Co. Kg Filter, in particular for a vehicle
WO2003082436A3 (en) * 2002-03-23 2003-12-24 Omnipure Filter Company Filtration media comprising granules of binder-agglomerated active component
WO2005053818A1 (en) * 2003-12-08 2005-06-16 Herding Gmbh Filtertechnik Filter element that exhibits heat and/or chemical resistance
JP2007187312A (en) * 2005-12-19 2007-07-26 Bluecher Gmbh Adsorptive storage unit for gas
WO2008148439A1 (en) * 2007-06-08 2008-12-11 BLüCHER GMBH Mat-shaped foam material for cleaning and/or filtering air
FR2931157A1 (en) * 2008-05-19 2009-11-20 Inst Superieur De Plasturgie D SOLID MATERIAL CONTAINING AN ACTIVE LOAD AND ENABLING GREAT FACILITY OF ACCESS TO THIS LOAD
CN110897232A (en) * 2019-12-20 2020-03-24 北京化工大学 A self-cleaning foam filter mask that can be used for a long time

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2927287B2 (en) * 1979-07-06 1981-05-21 HELSA - Werke Helmut Sandler & Co, 8586 Gefrees Multi-layer filter material with at least one layer of open-cell foam
DE3228156C2 (en) * 1982-07-28 1994-01-20 Bluecher Hubert Use of a flexible surface filter in an air cleaning device for motor vehicle cabins
GR79403B (en) * 1982-11-24 1984-10-22 Bluecher Hubert
DE3304349C3 (en) * 1983-02-09 1995-10-26 Bluecher Hubert Surface filter and process for its manufacture
DE3443900C2 (en) * 1984-12-01 1997-03-06 Bluecher Hubert Protective material, process for its production and its use
DE3524431A1 (en) * 1985-07-09 1987-01-22 Knecht Filterwerke Gmbh PLATE-SHAPED FILTER INSERT
DE3526181A1 (en) * 1985-07-23 1987-02-05 Bayer Ag METHOD FOR REMOVING IMPURITIES FROM MIXTURES OF WATER WITH WATER MISCELABLE SOLVENTS
US4680040A (en) * 1986-01-17 1987-07-14 Xerox Corporation Multipurpose filtering material
DE3719233A1 (en) * 1987-06-09 1988-12-22 Erich Busch SELF-SUPPORTING FILTER BODY
DE3719420A1 (en) * 1987-06-11 1988-12-29 Sandler Helmut Helsa Werke RESPIRATORY MASK
DE3719418C1 (en) * 1987-06-11 1988-07-21 Sandler Helmut Helsa Werke Process for the production of a filter material
DE3719419A1 (en) * 1987-06-11 1988-12-29 Sandler Helmut Helsa Werke Filter cartridge for a respirator mask
DE3719415A1 (en) * 1987-06-11 1988-12-22 Sandler Helmut Helsa Werke Filter device and process for the production thereof
DE3740091A1 (en) * 1987-11-26 1989-06-15 Paul J M Haufe FILTER MATERIAL
DE3806252C1 (en) * 1988-02-27 1989-07-27 Adam Opel Ag, 6090 Ruesselsheim, De
DE3813563C2 (en) * 1988-04-22 2002-01-17 Mhb Filtration Gmbh & Co Kg Adsorption filter with high air permeability
DE3813562C2 (en) * 1988-04-22 1997-11-27 Hasso Von Bluecher Activated carbon filter layer for gas masks
DE3817084C1 (en) * 1988-05-19 1989-09-21 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De Odour-binding filter in the feed air stream of a motor vehicle interior
DE3818993A1 (en) * 1988-06-03 1990-02-08 Hasso Von Bluecher System for cleaning up polluted rooms
DE3819002A1 (en) * 1988-06-03 1989-12-14 Hasso Von Bluecher Air filter for passenger cells
EP0345381A3 (en) * 1988-06-07 1991-04-10 The Clorox Company Liquid filter
DE4000193C2 (en) * 1990-01-05 1995-12-07 Diekmann Gmbh & Co Kg Heinrich Sorbent body and method for producing a sorbent body
DE59106195D1 (en) * 1990-01-23 1995-09-14 Takara Shuzo Co FILTER MATERIAL FOR MOTOR VEHICLES.
DE4020428A1 (en) * 1990-06-27 1992-01-02 Hasso Von Bluecher Floor coverings and domestic textiles - with active carbon backing for radon adsorption
DE4020427A1 (en) * 1990-06-27 1992-01-02 Hasso Von Bluecher Adsorbent impregnated fabric filter - with low flow resistance, suitable for compact air conditioner units
DE4022937A1 (en) * 1990-07-19 1992-01-23 Schwaebische Huettenwerke Gmbh FILTER OR CATALYST BODY
DE4241605A1 (en) * 1992-12-10 1994-06-16 Hasso Von Bluecher High air permeability filter system - has coarsely porous absorption section followed by finely porous absorption section.
DE19643391A1 (en) * 1996-10-21 1998-04-30 Stefan Mantz Arrangement of drinks production filter, cheaply made and of good durability
RU2152243C1 (en) * 1999-04-06 2000-07-10 Волгоградский государственный технический университет Filtration material
DE10261996B4 (en) 2002-08-29 2012-02-09 BLüCHER GMBH Adsorption material and its use
DE10240548C5 (en) * 2002-08-29 2011-06-16 BLüCHER GMBH Adsorption material, process for its preparation and its use
DE102010024990A1 (en) * 2010-02-15 2011-08-18 Blücher GmbH, 40699 Adsorptive system, preferably based on agglomerate, useful in an adsorptive shaped body and a filter, comprises many adsorber particles exhibiting a first and a second particulate adsorption material and a binder support
DE102020116991B3 (en) 2020-06-29 2021-09-02 Franz Durst Breathing air filter and method for operating a breathing air filter

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB516268A (en) * 1938-07-22 1939-12-28 Frantisek Voves Improvements in or relating to gas mask filters and the like
US3387940A (en) * 1963-08-29 1968-06-11 Union Carbide Corp High-strength carbon foam
GB1245965A (en) * 1968-01-19 1971-09-15 Bondina Ltd Formerly Bondina B Protective materials
DE2030835A1 (en) * 1970-06-23 1972-01-05 Collo-Rheincollodium Köln GmbH, Werk Hersei, 5304 Hersei Filters for removing gases, vapors and the like from the air and a process for its manufacture
FR2105308A5 (en) * 1970-08-10 1972-04-28 France Etat
JPS5111037B2 (en) * 1973-04-26 1976-04-08
JPS5071595A (en) * 1973-10-29 1975-06-13
DE2400827C3 (en) * 1974-01-09 1982-02-18 Hasso von 4000 Düsseldorf Blücher Filter material made of open-cell polyurethane foam as a carrier material and activated carbon and process for its production
US3971373A (en) * 1974-01-21 1976-07-27 Minnesota Mining And Manufacturing Company Particle-loaded microfiber sheet product and respirators made therefrom

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0031719A3 (en) * 1979-12-28 1981-07-22 Albany International Corporation Sorbent-loaded textile fibers and films and methods of fabricating the same
EP0036338A1 (en) * 1980-03-19 1981-09-23 Allan Henry Meny A regenerative, fluid filter
GB2138695A (en) * 1983-04-29 1984-10-31 Sorbexx Gmbh Filter element
GB2148740A (en) * 1983-10-31 1985-06-05 La Pena Michael De Gas treatment device
EP0238463A1 (en) * 1986-03-06 1987-09-23 Mediplast AB A device for absorption of carbon dioxide in a breathing apparatus
US5582865A (en) * 1988-12-12 1996-12-10 Extraction Systems, Inc. Non-woven filter composite
US5626820A (en) * 1988-12-12 1997-05-06 Kinkead; Devon A. Clean room air filtering
GB2238802A (en) * 1989-12-06 1991-06-12 Purification Prod Production of particulate solid-bearing air-permeable sheet materials
GB2238802B (en) * 1989-12-06 1993-10-06 Purification Prod Improvements in the production of particulate solid-bearing low density air-permeable sheet materials
US5281437A (en) * 1989-12-06 1994-01-25 Purification Products Limited Production of particulate solid-bearing low density air-permeable sheet materials
US5607647A (en) * 1993-12-02 1997-03-04 Extraction Systems, Inc. Air filtering within clean environments
WO2001091886A1 (en) * 2000-05-31 2001-12-06 Helsa-Werke Helmut Sandler Gmbh & Co. Kg Filter, in particular for a vehicle
WO2003082436A3 (en) * 2002-03-23 2003-12-24 Omnipure Filter Company Filtration media comprising granules of binder-agglomerated active component
US7293661B2 (en) 2002-03-23 2007-11-13 Omnipure Filter Company Filtration media comprising granules of binder-agglomerated active component
US7740141B2 (en) 2002-03-23 2010-06-22 Omnipure Filter Company, Inc. Method of making a granular media water filter
US8167145B2 (en) 2002-03-23 2012-05-01 Omnipure Filter Co., Inc. Method of making a granular media water filter
WO2005053818A1 (en) * 2003-12-08 2005-06-16 Herding Gmbh Filtertechnik Filter element that exhibits heat and/or chemical resistance
JP2007512957A (en) * 2003-12-08 2007-05-24 ヘルディング ゲゼルシャフト ミット ベシュレンクテル ハフツング フィルターテヒニーク Filter element having heat resistance and / or chemical resistance
JP2007187312A (en) * 2005-12-19 2007-07-26 Bluecher Gmbh Adsorptive storage unit for gas
US7785702B2 (en) 2005-12-19 2010-08-31 Kaemper Stefan Sorptive storage unit for gases
WO2008148439A1 (en) * 2007-06-08 2008-12-11 BLüCHER GMBH Mat-shaped foam material for cleaning and/or filtering air
FR2931157A1 (en) * 2008-05-19 2009-11-20 Inst Superieur De Plasturgie D SOLID MATERIAL CONTAINING AN ACTIVE LOAD AND ENABLING GREAT FACILITY OF ACCESS TO THIS LOAD
WO2009150358A1 (en) * 2008-05-19 2009-12-17 Institut Superieur De Plasturgie D'alencon - Entreprises Solid material containing an active load and enabling easy access to said load
CN110897232A (en) * 2019-12-20 2020-03-24 北京化工大学 A self-cleaning foam filter mask that can be used for a long time

Also Published As

Publication number Publication date
DE2804154C2 (en) 1984-04-19
FR2416044B1 (en) 1983-08-12
FR2416044A1 (en) 1979-08-31
CA1115679A (en) 1982-01-05
GB2013102B (en) 1982-06-30
DE2804154B1 (en) 1979-01-25
CH635519A5 (en) 1983-04-15

Similar Documents

Publication Publication Date Title
GB2013102A (en) A filter material and its manufacture
JPS5635785A (en) Electrolytic apparatus with ion exchange membrane
JPS6415103A (en) Composite membrane for separating increased fluid
JPS5699242A (en) Porous sheet and production thereof
DE69804786D1 (en) METHOD FOR PRODUCING A POROUS CARBON BODY AND THE BODY SO PRODUCED
DE19963066A1 (en) Absorber of carbon dioxide for narcosis units incorporates macro-porous ion exchanger resin with primary benzyl amine groups
JPS5664657A (en) Hydrophilic filler for chromatography
JPS57174484A (en) Production of metallic porous body of micropore sized foam structure
JPS5569626A (en) Porous high-molecular-weight composite with hydrophilic inner surface and its production
US11376539B2 (en) Multilayer film for air purification and method for manufacturing same
ATE126076T1 (en) ACTIVE CHARCOAL FILTER LAYER FOR GAS MASKS AND GAS MASK CONTAINING THIS ACTIVE CHARCOAL FILETRE LAYER.
HUT53947A (en) Air filter and method for producing same
JPS5569627A (en) Production of porous film of vinylidene fluoride resin
GB387809A (en) Improvements in depolarising electrodes for electric batteries
JPS5611931A (en) Porous membrane of polyvinyl alcohol
JPS5567390A (en) Method and apparatus for treatment of waste water
JPS56112487A (en) Production of alkali hydroxide and chlorine
Graham XXII.—On the absorption and dialytic separation of gases by colloid septa
SE8200583L (en) WASTE WATER CLEANING
JPS56135525A (en) Production of porous membrane
JPS5579011A (en) Separation of oil emulsion
RU2092239C1 (en) Method of preparing carbon dioxide absorbent
JPS5615803A (en) Treatment of diaphragm
FR2142664A1 (en) Composite flexible sheet - for filtering contaminated air for liquids, aerosol particles or chemicals
JPS55165929A (en) Production of microporous permeable polymer film

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960623