Acrylonitrile Patents (Class 210/500.43)
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Patent number: 9539549Abstract: Composite membrane having a separating membrane layer characterized in that a separating membrane layer is produced by curing laterally modified silicone acrylates of the general Formula IType: GrantFiled: November 2, 2010Date of Patent: January 10, 2017Assignee: Evonik Degussa GmbHInventors: Rene Haensel, Hardi Doehler, Peter Schwab, Peter Seidensticker, Michael Ferenz, Goetz Baumgarten, Marina Lazar, Markus Ungerank
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Publication number: 20150053607Abstract: The invention provides a graphene derivative composite membrane and method for fabricating the same. The graphene derivative composite membrane comprises a support membrane made of porous polymer and a plurality of graphene derivative layers disposed on the support membrane wherein the distance between adjacent graphene derivative layers is about 0.3˜1.5 nm and the total thickness of the plurality of graphene derivative layers is more than 100 nm.Type: ApplicationFiled: October 23, 2013Publication date: February 26, 2015Applicant: CHUNG-YUAN CHRISTIAN UNIVERSITYInventors: Wei-Jen Liu, Wei-Song Hung, Juin-Yih Lai, Kueir-Rarn Lee
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Publication number: 20140326669Abstract: Synthetic membranes for the removal, isolation or purification of substances from a liquid. The membranes include at least one hydrophobic polymer and at least one hydrophilic polymer. 5-40 wt.-% of particles having an average particles size of between 0.1 and 15 ?m are entrapped. The membrane has a wall thickness of below 150 ?m. Methods for preparing the membranes in various geometries, and use of the membranes for the adsorption, isolation and/or purification of substances from a liquid are explored.Type: ApplicationFiled: December 10, 2012Publication date: November 6, 2014Inventors: Ralf Flieg, Markus Storr, Bernd Krause, Markus Hornung, Karl Heinz Klotz
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Patent number: 8877062Abstract: The invention relates to extracorporeal blood circuits, and components thereof (e.g., hollow fiber membranes, potted bundles, and blood tubing), including 0.005% to 10% (w/w) surface modifying macromolecule. The extracorporeal blood circuits have an antithrombogenic surface and can be used in hemofiltration, hemodialysis, hemodiafiltration, hemoconcentration, blood oxygenation, and related uses.Type: GrantFiled: July 12, 2010Date of Patent: November 4, 2014Assignee: Interface Biologics, Inc.Inventors: Sanjoy Mullick, Weilun Chang, Hanje Chen, Mark Steedman, Roseita Esfand
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Publication number: 20140151288Abstract: Technologies are generally described for composite membranes which may include a porous graphene layer in contact with a porous support substrate. In various examples, a surface of the porous support substrate may include at least one of: a thermo-formed polymer characterized by a glass transition temperature, a woven fibrous membrane, and/or a nonwoven fibrous membrane. Examples of the composite membranes permit the use of highly porous woven or nonwoven fibrous support membranes instead of intermediate porous membrane supports. In several examples, the composite membranes may include porous graphene layers directly laminated onto the fibrous membranes via the thermo-formed polymers. The described composite membranes may be useful for separations, for example, of gases, liquids and solutions.Type: ApplicationFiled: November 30, 2012Publication date: June 5, 2014Applicant: Empire Technology Development LLCInventors: Seth Adrian Miller, Gary L. Duerksen
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Patent number: 8741974Abstract: A method for forming a filter in a fluid flow path in a microfluidic device is provided. The method includes introducing a photopolymerization reaction solution into the microfluidic device; and performing polymerization of photopolymerization reaction solution to form a filter in the fluid flow path in a microfluidic device.Type: GrantFiled: June 18, 2008Date of Patent: June 3, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Chang-eun Yoo, Jong-myeon Park
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Publication number: 20130327704Abstract: An electrochemical separation membrane and the manufacturing method thereof are disclosed. The method includes: a polymer solution preparing step to mix a polymer material, solvent and ceramic precursors thoroughly to form a polymer solution, wherein the polymer material and the ceramic precursors are dissolved uniformly in the solvent; a coating step to coat the polymer solution on a porous base material; a hydrolysis step to cause the porous base material coated with the polymer solution to contact an aqueous solution to hydrolyze the ceramic precursor into ceramic particles; and a drying step to remove the water and the solvent from the porous base material and in order to form the electrochemical separation membrane. The electrochemical separation membrane made of this method have better ion conductivity, interface stability and thermal stability based on the ceramic particles.Type: ApplicationFiled: November 7, 2012Publication date: December 12, 2013Applicant: ENERAGE INC.Inventors: Mark Y. Wu, Cheng-Yu Hsieh, Yuan-Hsin Chang, Jing-Ru Chen, Shu-Ling Hsieh
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Publication number: 20130233791Abstract: The present invention relates to a separation membrane for water treatment having high water flux and membrane contamination preventing characteristics, and a manufacturing method thereof. The separation membrane for water treatment according to the present invention includes a nanofiber wherein the separation membrane has a surface electric charge. According to the present invention, a separation membrane for water treatment having high water flux and membrane contamination preventing characteristics, and a manufacturing method thereof may be implemented.Type: ApplicationFiled: October 9, 2012Publication date: September 12, 2013Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Chong Min KOO, Kyung Youl BAEK, Seung Sang HWANG, Soon Man HONG, Ho Bum PARK, Ji Young JUNG, Jang Woo LEE, Young Hoon CHO, Seung Gun YU, Sang Hee PARK
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Patent number: 8505745Abstract: The present application is generally directed towards polyacrylonitrile- (PAN-) based, amphophilic graft copolymers, for example, for the production of membranes for liquid filtration. In one aspect, the present invention provides systems and methods for preparing high flux, fouling resistant nanofiltration membranes whose pore size can be readily tuned. In some cases, microphase separation of a graft copolymer comprising a backbone comprising polyacrylonitrile (PAN) and hydrophilic side-chains is used. In some cases, nanochannels of tunable width are formed, which may give the membrane permselective properties and/or anti-fouling character. In some cases, a copolymer may be used as an additive in the immersion precipitation casting of ultrafiltration or microfiltration membranes. In certain instances, the additive can segregate to the membrane exterior and/or pore surfaces, e.g.Type: GrantFiled: April 10, 2007Date of Patent: August 13, 2013Assignee: Massachusetts Institute of TechnologyInventor: Ayse Asatekin Alexiou
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Publication number: 20130146521Abstract: Stabilized surfactant-based membranes and methods of manufacture thereof. Membranes comprising a stabilized surfactant mesostructure on a porous support may be used for various separations, including reverse osmosis and forward osmosis. The membranes are stabilized after evaporation of solvents; in some embodiments no removal of the surfactant is required. The surfactant solution may or may not comprise a hydrophilic compound such as an acid or base. The surface of the porous support is preferably modified prior to formation of the stabilized surfactant mesostructure. The membrane is sufficiently stable to be utilized in commercial separations devices such as spiral wound modules. Also a stabilized surfactant mesostructure coating for a porous material and filters made therefrom. The coating can simultaneously improve both the permeability and the filtration characteristics of the porous material.Type: ApplicationFiled: November 23, 2012Publication date: June 13, 2013Applicant: ZNANO LLCInventor: zNano LLC
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Publication number: 20130112618Abstract: Filtration membrane comprising polymeric nanofibers and/or microfibers attaching dendrimer component presenting reactive sites selective for chemicals to be filtered, and related nanofibers and microfibers, composite materials, compositions, methods and system.Type: ApplicationFiled: August 8, 2012Publication date: May 9, 2013Inventors: Mamadou S. DIALLO, William A. GODDARD, III, Seong-Jik PARK, Manki CHO
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Patent number: 8403151Abstract: A nanofiber-containing membrane has a specific surface area of 0.1 to 1000 m2/g, porosity of 10 to 99.5% and a pore size of 0.01 to 10 ?m. This provides a nanofiber-containing membrane having properties of high specific surface area, high porosity, nanoscale pore size, high pore uniformity and so on. A process for producing a nanofiber-containing membrane comprising producing a membrane from a polymer solution by electrospinning technology under optimal operation conditions.Type: GrantFiled: March 31, 2010Date of Patent: March 26, 2013Assignee: Taiwan Textile Research InstituteInventors: Tai-Hong Cheng, Cheng-Chiang Huang
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Publication number: 20130026091Abstract: Described herein are thin film composite (TFC) membranes, for use in forward osmosis (FO) and pressure reduced osmosis (PRO) processes. The membrane is comprised of two layers: a composite layer combining a backing layer and a porous, polymer-based support into a single layer, and a rejection layer disposed on top of the composite layer. The membrane of the invention exhibits high water flux values for FO processes, is durable, may be readily manufactured using typical membrane manufacturing processes, such as spiral winding and plate and frame processes, and has sufficient mechanical stability to handle the final membrane product.Type: ApplicationFiled: July 26, 2012Publication date: January 31, 2013Applicant: HYDRATION SYSTEMS, LLCInventors: Isaac V. Farr, Upen J. Bharwada, Tilak Gullinkala
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Publication number: 20130026088Abstract: Described herein is a method for altering the characteristics of a membrane comprising a dielectric material. The method comprises heating the membrane and applying an electric field in a direction out of the plane of the membrane to at least a portion of the dielectric material. At least a portion of the dielectric material becomes aligned with the applied electric field. In some embodiments, the membrane is piezoelectric and application of an electric signal to the membrane causes out of plane movement of the membrane. Also disclosed are membranes and systems and apparatuses comprising such membranes.Type: ApplicationFiled: November 25, 2010Publication date: January 31, 2013Inventors: Hans Gerard Leonard Coster, Tahereh Darestani Farahani, Terry Calvin Chilcott
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Publication number: 20130004454Abstract: Oligo- or polyurethane compounds of the formula (I) wherein k and n independently are numbers from 1 to 100, m is from the range 1-100, (X) is a block of formula (II) and (Y) is a block of the formula (III), (A) is a residue of an aliphatic or aromatic diisocyanate linker, (B) is a residue of a linear oligo- or polysiloxane containing alkanol end groups, and optionally further containing one or more aliphatic ether moieties, and (C) is an aromatic oligo- or polysulfone block, may advantageously be used as anti-adhesion additives in polymer compositions e.g. for membranes; related oligo- or polyurethanes wherein m is 0 are especially suitable for the preparation of antimicrobial water separation membranes.Type: ApplicationFiled: March 1, 2011Publication date: January 3, 2013Applicant: POLYMERS CRC LTD.Inventors: Thomas Weiss, Jaleh Mansouri
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Publication number: 20120273421Abstract: Solvent and acid stable ultrafiltration and nanofiltration membranes including a non-cross-linked base polymer having reactive pendant moieties, the base polymer being modified by forming a cross-linked skin onto a surface thereof, the skin being formed by a cross-linking reaction of reactive pendant moieties on the surface with an oligomer or another polymer as well as methods of manufacture and use thereof, including, inter alia separating metal ions from liquid process streams.Type: ApplicationFiled: January 13, 2010Publication date: November 1, 2012Inventors: Mordechai Perry, Vera Ginzburg, Boris Ginzburg, Polina Lapido
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Patent number: 8197745Abstract: A permselective asymmetric hollow fiber membrane for the separation of toxic mediators from blood, a process for the preparation of such a membrane, and the use of such a membrane in hemodialysis, hemodiafiltration, and hemofiltration for treatment of toxic mediator-related diseases.Type: GrantFiled: February 14, 2012Date of Patent: June 12, 2012Assignee: Gambro Lundia ABInventors: Reinhold Buck, Hermann Goehl
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Patent number: 8137562Abstract: The invention concerns a composite support comprising a base support for the treatment of a biological fluid, in which: “the base support is essentially-constituted by a first polymer carrying anionic or anionizable groups;” at least a part of the surface of the base support is coated with a second polymer ionically bonded to the first polymer, the second polymer carrying the cationic or cationizable groups which are capable of forming an ionic bond with the anionic or anionizable groups of the first polymer; in which the second polymer is in the colloidal form and in mixture with a polyacid during application to the support, allowing the composite membrane to adsorb at least one entity containing anionic or anionizable groups by bonding with cationic or cationizable groups of the second polymer.Type: GrantFiled: September 6, 2006Date of Patent: March 20, 2012Assignee: Gambro Lundia ABInventor: Michel Thomas
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Patent number: 8136675Abstract: The present invention relates to a permselective asymmetric hollow fibre membrane for the separation of toxic mediators from blood, comprised of at least one hydrophobic polymer and at least one hydrophilic polymer. Further, the present invention relates to a process for the preparation of such a membrane, and the use of said membrane in hemodialysis, hemodiafiltration, and hemofiltration for treatment of toxic mediator-related diseases.Type: GrantFiled: December 18, 2003Date of Patent: March 20, 2012Assignee: Gambro Lundia ABInventors: Reinhold Buck, Hermann Goehl
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Patent number: 8118176Abstract: The object of the invention is a unit element forming a membrane comprising a semi-permeable material able to separate in two compartments a filtration device for extracorporeal treatment of a fluid such as blood or plasma, said material being negatively charged, said element having a first internal face intended to be in direct contact with blood or plasma and a second external face intended to be in contact with filtrate, wherein said second face of said element is treated on the surface by one selected in the group comprising at least a cationic polymer, a mixture of polymers of which at least one polymer is cationic. The unit element can also have said first face treated on the surface by one selected in the group comprising: at least one cationic polymer, a mixture of polymers of which at least one polymer is cationic.Type: GrantFiled: September 11, 2009Date of Patent: February 21, 2012Assignee: Gambro ABInventors: Nicolas Moachon, Michel Thomas
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Publication number: 20110198288Abstract: The present application is generally directed towards polyacrylonitrile— (PAN—) based, amphophilic graft copolymers, for example, for the production of membranes for liquid filtration. In one aspect, the present invention provides systems and methods for preparing high flux, fouling resistant nanofiltration membranes whose pore size can be readily tuned. In some cases, microphase separation of a graft copolymer comprising a backbone comprising polyacrylonitrile (PAN) and hydrophilic side-chains is used. In some cases, nanochannels of tunable width are formed, which may give the membrane permselective properties and/or anti-fouling character. In some cases, a copoylmer may be used as an additive in the immersion precipitation casting of ultrafiltration or microfiltration membranes. In certain instances, the additive can segregate to the membrane exterior and/or pore surfaces, e.g.Type: ApplicationFiled: April 10, 2007Publication date: August 18, 2011Applicant: Massachusetts Institute of TechnologyInventors: Anne M. Mayes, Ayse Asatekin Alexiou
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Publication number: 20110147308Abstract: A charged porous polymeric membrane comprises a porous polymeric membrane substrate comprising a polymeric membrane material and a first polymer having a first functional group, the first polymer is compatible with the membrane material, and a charged polymer has a second functional group, the charged polymer can react with the first polymer to bond the charged polymer to the first polymer, forming a charged coating on the membrane outer and inner surfaces. The membrane may be a microporous or an ultrafiltration membrane. The membrane may be a hollow fiber, flat sheet, or tubular membrane. Methods of manufacturing the membranes and method of using of the membranes to remove viral particles from contaminated water are further described.Type: ApplicationFiled: December 20, 2010Publication date: June 23, 2011Applicant: Siemens Water Technologies Corp.Inventors: Geoffrey JOHNSTON-HALL, Heinz-Joachim Muller, Dongliang Wang
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Patent number: 7811507Abstract: A hydrophilic semipermeable hollow-fibre membrane for blood treatment, with an integrally asymmetric structure based on a synthetic polymer. The hollow-fiber membrane possess on its inner surface a separating layer and an adjoining open-pored supporting layer, and has an ultrafiltration rate in albumin solution of 5 to ?25 ml/(h·m2·mmHg). The hollow fiber membrane is free from pore-stabilizing additives and has a maximum sieving coefficient for albumin of 0.005 and a sieving coefficient of cytochrome c that satisfies the equation SCcc?5·10?5·UFRAlb3?0.004·UFRAlb2+0.1081·UFRAlb?0.25.Type: GrantFiled: February 15, 2005Date of Patent: October 12, 2010Assignee: Membrana GmbHInventors: Friedbert Wechs, Arne Gehlen, Bodo Von Harten, Richard Kruger, Oliver Schuster
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Patent number: 7749385Abstract: The invention provides porous matrices that comprise one or more surfactants that can be used in non-aqueous environments.Type: GrantFiled: December 1, 2005Date of Patent: July 6, 2010Assignee: GE Osmonics Inc.Inventors: Steven D. Kloos, Brian Rudie, Leonard T. Hodgins
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Patent number: 7694827Abstract: A filter comprising a polymer material comprising a polymer matrix such as polyacrylonitrile containing dispersed metal oxide particles. The metal oxide particles are for example ferric oxide particles, and the polymer material contains generally 0.25-3% by weight of these particles. The filters are resistant to thermo-oxidation and have reduced shrinkage or degradation.Type: GrantFiled: June 11, 2003Date of Patent: April 13, 2010Assignees: Commonwealth Scientific & Industrial Research Organisation, Kelheim Fibres GmbHInventors: Bernd Huber, Robert Helstroom
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Patent number: 7677398Abstract: The invention provides a process for improving the antifouling properties and for increasing the selectivity of commercial composite polyamide nanofiltration (NF) and reverse osmosis (RO) membranes comprising circulating a low concentration of water soluble monomers and an initiating redox couple in an aqueous solvent, without transverse pressure over the surface of the membrane thereby effecting a free-radical graft polymerization on the surface of the membrane.Type: GrantFiled: September 4, 2005Date of Patent: March 16, 2010Assignee: Ben Gurion University of the Negev Research and Development AuthorityInventors: Sophia Belfer, Rosalia Fainstein, Luba Kesselman, Charles Linder
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Patent number: 7648034Abstract: The present invention provides porous media or membranes having a surface coating that includes a cross-linked terpolymer which has a superior combination of properties, including heat stable biomolecule resistant adsorptive properties, resistance to strong alkaline solutions, and low levels of extractable matter. In some preferred embodiments, the porous media is a porous membrane.Type: GrantFiled: April 26, 2002Date of Patent: January 19, 2010Assignee: Millipore CorporationInventors: John Charkoudian, Neil P. Soice
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Patent number: 7604746Abstract: The present application discloses a composite membrane comprising (a) a support member that has a plurality of pores extending through the support member and (b) a cross-linked copolymer comprising (i) a cationic monomer and an anionic monomer and/or (ii) a zwitterionic monomer, which cross-linked copolymer fills the pores of the support member, the cross-linked copolymer having a permeability for a fluid that is dependent on the polarity of the fluid, wherein the permeability increases with increasing polarity. The present application also discloses a process for the preparation of the composite membrane, a pervaporation apparatus comprising the composite membrane, and methods for the use of the composite material in separation and dehydration processes.Type: GrantFiled: April 25, 2005Date of Patent: October 20, 2009Assignee: McMaster UniversityInventors: Ronald F. Childs, Jie Yu
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Publication number: 20090188857Abstract: A membrane includes a porous base membrane and a hydrophilic coating. The coating comprises a hydrophilic additive and a hydrophilic polymer derivatized with an electron beam reactive group adapted to form a radical under high energy irradiation. In some embodiments, the membrane comprises a fluoropolymer. Also disclosed are processes for forming the membrane.Type: ApplicationFiled: November 21, 2008Publication date: July 30, 2009Applicant: GENERAL ELECTRIC COMPANYInventors: David Roger Moore, Ryan Austin Hutchinson
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Patent number: 7553417Abstract: Functionalized substrates, methods of making functionalized substrates, and methods of using functionalized substrates are disclosed.Type: GrantFiled: December 15, 2006Date of Patent: June 30, 2009Assignee: 3M Innovative Properties CompanyInventors: Clinton P. Waller, Jr., Douglas Eugene Weiss
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Patent number: 7284668Abstract: The present invention provides porous media or membranes having a surface coating that includes a first coating of a cross-linked terpolymer and a second coating comprising a copolymer or a terpolymer modified with a hydrophilic or hydrophobic functional group which has a superior combination of properties, including heat stable biomolecule resistant adsorptive properties, resistance to strong alkaline solutions, and low levels of extractable matter.Type: GrantFiled: February 8, 2005Date of Patent: October 23, 2007Assignee: Millipore CorporationInventor: John Charkoudian
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Patent number: 7172075Abstract: A defect free semipermeable composite membrane having outstanding integrity and high water permeability is provided. Said composite membrane comprises an inside support layer to provide sufficient mechanical strength, an outside barrier layer to provide selective separation and a middle layer to provide both chemical and physical binding between the support and the barrier layer. Two different methods for making said defect free composite membrane are discovered. These methods have been successfully used to produce high quality coatings and defect free composite membranes, which are independent of chemical composition and physical structure of said support. In the present invention, the ultrasonic sonication is utilized to speed up the phase inversion process of a membrane casting solution, and to produce a composite membrane at a speed higher than that disclosed in the prior art.Type: GrantFiled: August 8, 2003Date of Patent: February 6, 2007Assignee: Accord Partner LimitedInventor: jiang ji
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Patent number: 7165682Abstract: A defect free semipermeable composite membrane having excellent integrity and high water permeability is provided. Said composite membrane comprises an inside support layer to provide sufficient mechanical strength; an outside barrier layer to provide selective separation; and a middle layer to provide both chemical and physical binding between said support and said barrier layer to bond them together. Three different methods for making said defect free composite membrane are discovered. These methods have been successfully utilized to produce high quality coatings and defect free composite membranes, which are independent of chemical composition and physical structure of said support. In the present invention, ultrasonic sonication is discovered to be effective to speed up the phase inversion process of a membrane casting solution, thus allows produce a composite membrane at a speed higher than those disclosed in the prior art.Type: GrantFiled: July 16, 2003Date of Patent: January 23, 2007Assignee: Accord Partner LimitedInventor: Jiang Ji
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Patent number: 7073671Abstract: The present invention provides porous media or membranes having a surface coating that includes a first coating of a cross-linked terpolymer and a second coating comprising a copolymer or a terpolymer modified with a hydrophilic or hydrophobic functional group which has a superior combination of properties, including heat stable biomolecule resistant adsorptive properties, resistance to strong alkaline solutions, and low levels of extractable matter.Type: GrantFiled: June 7, 2002Date of Patent: July 11, 2006Assignee: Millipore CorporationInventor: John Charkoudian
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Patent number: 7071130Abstract: Segregating membrane supporting material is a three-dimensional assembly of fibers thermo-compressed into non-woven fabric, and the non-woven fabric fibers are joined together in sheet form. This segregating membrane supporting material is non-woven fabric, including at least 10 weight % polyacrylonitrile-based synthetic fibers, which is thermo-compressed to give an overall bulk density 40% to 75% of the density of the fibers which make up the non-woven fabric.Type: GrantFiled: July 21, 2003Date of Patent: July 4, 2006Assignees: Awa Paper Mfg. Co., Ltd., Japan Exlan Company LimitedInventors: Yoshitsugu Hama, Hideo Naka, Yoshifumi Kusaka, Akihiro Okubo
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Patent number: 7056458Abstract: The invention concerns a non-thrombogenic semipermeable membrane comprising a support semipermeable membrane and an anticoagulant suitable for treating blood and plasma by extracorporeal circulation. The invention is characterized in that: the support membrane is made essentially of a polyacrylinitrile, bearing anionic groups or groups capable of being anionic; the surface of the support semipermeable membrane designed to be in contact with blood or plasma is coated successively with a cationic polymer and an anticoagulant. The invention also concern an exchanger for treating blood or plasma by extracorporeal circulation comprising two sections separated by a non-thrombogenic semipermeable, membrane and a method for making the exchanger.Type: GrantFiled: January 26, 2001Date of Patent: June 6, 2006Assignee: Hospal IndustrieInventors: Thierry Crost, Jean-Louis Renaux, Michel Thomas
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Patent number: 7045062Abstract: Pervaporation membranes including poly(acrylamide)-grafted alginate membranes, which may be optimized for the separation of alcohols from water, low viscosity sodium alginate membranes containing PEG and PVA, which may be optimized for the separation of organic acids from water, and copolymeric PAN-grafted PVA membranes, which may be optimized for the separation of DMF from water, and methods of making such membranes. Use of such membranes in pervaporation and pervaporation devices containing such membranes. Use of such membranes alone or in combination with ion-exchange membranes for recovery of organic compounds or for water purification applications such as production of potable water or industrial waste treatment. The membranes of the present invention may be used to remove trace amounts of water from organic compounds.Type: GrantFiled: January 21, 2003Date of Patent: May 16, 2006Assignee: Seventy-Seventh Meridian Corporation, LLCInventors: Tejraj M. Aminabhavi, Padmakar V. Kulkarni, Mahaveer Kurkuri
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Patent number: 6858141Abstract: The present Application relates to a process for the preparation of ultrafiltration membranes from polyacrylonitrile using malic acid as additives, with said membrane of molecular weight ranging between 80 to 180K, showing high purification and water permeating ability.Type: GrantFiled: August 30, 2002Date of Patent: February 22, 2005Assignee: Council of Scientific & Industrial Research (CSIR)Inventors: Sudhir Sharadchandra Kulkarni, Madhuri Himmatrao Shinde, Deepak Anandrao Musale
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Publication number: 20040140259Abstract: The water flux of UF and MF membranes is dramatically increased by treatment with an aqueous solution of an organic linear polymer without detrimental decrease in other characteristics of the membrane, e.g. solute-rejection. Particular candidates for such treatment include UF and MF membranes made of PS, PES, PAN, and PVDF. The dramatic effectiveness of treatment with aqueous solutions of PEG having molecular weights between about 2000 and 6000 Daltons is shown.Type: ApplicationFiled: January 20, 2003Publication date: July 22, 2004Inventor: James A. Cummings
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Patent number: 6679988Abstract: An improved water purification system for production of USP purified water and/or USP water for injection include backwashable, chlorine tolerant microfilter or ultrafilter for initial filtration of the feed water (10). The filtrate from the filter (18) is provided to a dechlorinator (18) prior to being subjected to an optional, reverse osmosis membrane unit (60) and then to a still (66) which discharges purified water at USP standards for purified water or water for injection.Type: GrantFiled: January 9, 2002Date of Patent: January 20, 2004Assignee: Mechanical Equipment Company, Inc.Inventor: George V. Gsell
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Publication number: 20030102259Abstract: The present Application relates to a process for the preparation of ultrafiltration membranes from polyacrylonitrile using malic acid as additives, with said membrane of molecular weight ranging between 80 to 180K, showing high purification and water permeating ability.Type: ApplicationFiled: August 30, 2002Publication date: June 5, 2003Inventors: S.S. Kulkarni, M.H. Shinde, D.A. Musale
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Patent number: 6558546Abstract: A pore plugging material, for pH dependent membrane diffusion, in which cyclic olefins having phosphazene-functional moieties provide predictable erosion properties when used to plug pores in separation barriers and other porous membranes. Specific properties of the polymers are dependent on several factors, including molecular weight and identity of side groups attached to the phosphazene moiety. However, as a class, phosphazene-functional cyclic olefins provide both predictable erodibility and uniformly benign hydrolysis products and are, therefore, uniquely suitable as pore plugging polymers for separation barriers and membranes of all kinds. The invention, therefore, embraces the provision of a pH-sensitive erodible pore plugging material for pores in separation barriers and membranes of all kinds.Type: GrantFiled: November 1, 2001Date of Patent: May 6, 2003Assignee: The Penn State Research FoundationInventors: Harry R. Allcock, Jared Bender, Roy H. Hammerstedt, Stephen Schwartz, Walter Laredo
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Patent number: 6423232Abstract: A method for preventing activation of the contact phase of blood or plasma which comes into contact with a semi-permeable membrane based on polyacrylonitrile bearing fixed negative charges, which is fitted in apparatus for the treatment of blood or plasma, by extra-corporal circulation, said method comprising contacting blood or plasma with said semi-permeable membrane, wherein: a neutral or cationic polymer is combined with said semi-permeable membrane before or after formation of the membrane, and before sterilization of the membrane; the overall ionic capacity of the semi-permeable membrane, based on polyacrylonitrile bearing fixed negative charges and containing a neutral or cationic polymer, is negative; the overall ionic capacity of the semi-permeable membrane, based on polyacrylonitrile bearing fixed negative charges and containing a neutral or cationic polymer, is, as an absolute value, not more than 10% less than the overall ionic capacity of the same semi-permeable membrane without a neutral or catiType: GrantFiled: September 7, 2000Date of Patent: July 23, 2002Assignee: Hospal IndustrieInventors: Michel Thomas, Pierre Valette
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Publication number: 20010047959Abstract: A polyacrylonitrile-based hollow fiber filtration membrane, wherein said membrane comprises a sponge structure free from polymer defect sites of sizes larger than 10 &mgr;m inside the membrane, pore sizes of the membrane continuously decrease towards both surfaces of the membrane, and the pore size on the outer surface of the membrane is differentiated from that on the inner surface.Type: ApplicationFiled: June 25, 2001Publication date: December 6, 2001Applicant: Asahi Kasei Kabushiki KaishaInventors: Teruhiko Oishi, Noboru Kubota
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Patent number: 6325218Abstract: This invention relates to a polyion complex separation membrane with a double structure, which is applicable in the separation process of a water-soluble mixture having ionic molecules or particles by means of reverse osmotic pressure for the purposes of recovering expensive ionic organic materials such as anionic emulsifiers from the waste water. More particularly, this invention relates to said membrane having anionic polymers, as substrate, which is immersed into a cationic polymer solution containing a multivalent ion cross-linking agent, by which a cross-linkage within the internal of the separation membrane is achieved, thereby forming an ion complex between ionic polymers of opposite ion at the surface of the separation membrane to yield a stable separation membrane of a double structure.Type: GrantFiled: February 24, 2000Date of Patent: December 4, 2001Assignee: Korea Research Institute of Chemical TechnologyInventors: Jung Min Lee, Choong Kyun Yeom, Chul Ung Kim, Beom Sik Kim, Kwang Joo Kim
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Patent number: 6293411Abstract: Supported separation membranes are disclosed wherein the permselective membrane is integral with a polymeric support of non-woven fibers having a particular air permeability, the integral membranes exhibiting far superior lifetimes and retention capability, especially for microorganisms.Type: GrantFiled: September 27, 1999Date of Patent: September 25, 2001Assignee: Sartorius AGInventor: Hans Beer
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Patent number: 6260715Abstract: A module for extracorporeal purification of a biological fluid includes at least one support or wall defining a compartment which is delimited by an ionic functionalized support or wall, the surface of which is bonded by ionic bonds to a first molecule or macromolecule which exhibits free amine groups to which are covalently bonded a second molecule or macromolecule which exhibits free carboxylic groups which can directly or indirectly form amide, ester or thioester bonds. The invention also includes methods of producing such module.Type: GrantFiled: February 24, 1999Date of Patent: July 17, 2001Assignee: Hospal IndustrieInventors: Laurent Simard, Michel Thomas, Gérard Quash, Nicolas Moachon
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Patent number: 6248238Abstract: A medical apparatus for the extracorporeal treatment of blood or plasma comprises a semi-permeable membrane consisting of at least one electronegative polymer, such that the surface of the semi-permeable membrane has negative electric charges. Before the sterilization of the apparatus, and before or after the formation of the membrane, at least one cationic and anti-protease agent is incorporated in at least one part of the membrane, this agent undergoing bulk adsorption or semi-bulk adsorption in the membrane and/or being bound by an ionic interaction with the electronegative sites of the membrane.Type: GrantFiled: April 21, 1997Date of Patent: June 19, 2001Assignee: Hospal IndustrieInventors: Jacques Burtin, Michel Thomas, Pierre Valette
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Patent number: 6180007Abstract: A permselective graft polymer is disclosed that is formed by converting into intermediate reactive sites a portion of the cyano groups of a backbone polymer containing —CH2—CH(—C≡N)— units, and grafting polyalkylene oxide polymer chains to the backbone polymer through the reactive sites. Either the backbone polymer of a polymer resin or a permselective polymer membrane can be grafted. When a resin is used, it is formed into a permselective polymer membrane using known methods. The resulting permselective membrane can be formed into hollow fibers or flat sheets for the encapsulation of living cells. The encapsulated cells are then implanted into a patient in need of the biologically active factors produced by the cells. The permselective graft polymer membrane exhibits good molecular diffusion with minimal protein adsorption.Type: GrantFiled: January 31, 1998Date of Patent: January 30, 2001Assignee: Neurotech, SAInventors: Frank Gentile, Molly Shoichet, Milton Harris
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Patent number: 6177013Abstract: The invention relates to the use of a neutral or cationic polymer for preventing activation of the contact phase of blood or plasma which comes into contact with a semi-permeable membrane based on polyacrylonitrile bearing fixed negative charges, which is fitted in apparatus for the treatment of blood or plasma by extra-corporal circulation, by combination of the neutral or cationic polymer, before or after formation of the membrane and before its sterilization, so as to modify the electrical properties of the membrane, the Zeta potential “Z” and the electrical resistivity “R” in order to obtain: either an electrokinetic index “I” of less than or equal to 0.8, “I” corresponding to Log10 (|Z|/R), or a positive Zeta potential “Z” of between 0 and 15 mV (limits not included).Type: GrantFiled: December 18, 1998Date of Patent: January 23, 2001Assignee: Hospal IndustrieInventors: Michel Thomas, Pierre Valette