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| Number | Title | Issue Date |
| 8181794 | Forward osmosis membranes Forward osmosis membranes include an active layer and a thin support layer. A bilayer substrate including a removable backing layer may allow forward osmosis membranes with reduced supporting layer thickness to be processed on existing manufacturing lines. ... | 05/22/2012 |
| 8025159 | Agent for increasing rejection with a permeable membrane, process for increasing the rejection, permeable membrane and process for water treatment An agent for increasing the rejection with a permeable membrane which comprises an ionic macromolecule having a weight-average molecular weight of 100,000 or greater; a process for increasing the rejection with a permeable membrane which comprises treating a permeab... | 09/27/2011 |
| 8002120 | Modified polyamide membrane A modified polyamide membrane and method for making and using the same. The present invention includes many embodiments including methods comprising contacting a polyamide membrane with certain modifiers, including but not limited to certain oxazoline and/or thiazol... | 08/23/2011 |
| 7918349 | Composite polyamide membrane with branched poly(alkylene oxide) modified surface Composite membranes that exhibit long-term resistance to biofouling comprise a porous support and a crosslinked polyamide discriminating layer having an external surface, the discriminating layer comprising a branched poly(alkylene oxide) (PAO) polymer attached to i... | 04/05/2011 |
| 7913857 | Selective membrane having a high fouling resistance A selective membrane having a high fouling resistance. In one embodiment, the selective membrane is a composite polyamide reverse osmosis membrane in which a hydrophilic coating is applied to the polyamide layer of the membrane, the hydrophilic coating being made by... | 03/29/2011 |
| 7909179 | Modified polyamide matrices and methods for their preparation The invention provides novel polymer matrices and methods for preparing polymer matrices. ... | 03/22/2011 |
| 7905361 | Modified polyamide membrane A modified polyamide membrane and method for making and using the same. The present invention includes many embodiments including methods comprising contacting a polyamide membrane with certain modifiers, including but not limited to certain oxazoline and/or thiazol... | 03/15/2011 |
| 7882963 | Modified membrane A multilayered modified membrane and method for making the same, comprising a modified discriminating layer that can have a fouling resistant surface, improved salt rejection, antimicrobial properties, and/or improved solute, and/or small organics rejection as compa... | 02/08/2011 |
| 7866487 | Aromatic polyamide porous film, process for producing the same and secondary battery The problem addressed by this invention is to provide an aromatic polyamide porous film excellent in the capability of being thinned and capable of easily exhibiting stable porosity properties even if it is used for a long period of time at high temperature. This in... | 01/11/2011 |
| 7806275 | Chlorine resistant polyamides and membranes made from the same A chlorine resistant polyamide is formed from the reaction product of an amine and an acid chloride monomer wherein the acid chloride monomer is modified with electron-withdrawing groups that exhibit sufficient activity to (i) minimize any chlorination on both the a... | 10/05/2010 |
| 7770739 | Method of manufacturing membranes and the resulting membranes This invention provides a process for making microporous membranes from a polymer solution and the membranes therefrom. A thermal assist, such as heating of the polymer solution can be effected subsequent to shaping the solution, such as by forming a film, tube or h... | 08/10/2010 |
| 7766173 | Polyamide reverse osmosis composite membrane and preparation method thereof An amine aqueous solution for forming an active layer of a polyamide reverse osmosis composite membrane is prepared, which consists of 0.1 through 20 weight % of polyfunctional aromatic amine monomer, 0.1 through 20 weight % of multi-functional tertiary alcohol amin... | 08/03/2010 |
| 7708150 | Process for preparing semipermeable membranes The invention provides methods for preparing reverse osmosis membranes having improved permeability as well as membranes prepared by such methods. ... | 05/04/2010 |
| 7677398 | Process for improving membranes 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... | 03/16/2010 |
| 7677399 | Separation membrane and manufacturing process thereof A process for manufacturing a separation membrane with excellent productivity, which can uniformly dry and imidize a separation membrane precursor solution formed on an inner surface of through-holes of a monolith substrate and which does not require complicated ope... | 03/16/2010 |
| 7537697 | Selective membrane having a high fouling resistance A selective membrane having a high fouling resistance. In one embodiment, the selective membrane is a composite polyamide reverse osmosis membrane in which a hydrophilic coating is applied to the polyamide layer of the membrane, the hydrophilic coating being made by... | 05/26/2009 |
| 7462283 | System and method for liquid filtration based on a neutral filter material The present invention teaches, that the removal of particles of any charge from liquid stream is possible by mechanisms other than sieving with good flow and low pressure drop. The use of a weakly charged or neutral surface on the one or more filters within a pre-se... | 12/09/2008 |
| 7425266 | Water-filtering media and filters In at least some embodiments, a filter comprises a filtering media. The filtering media is impregnated with chemical compounds that effectively retain water molecules and water-alcohol molecules but not alcohol molecules. The filter also comprises a liquid channelin... | 09/16/2008 |
| 7407702 | Polymetaphenylene isophthalamide-based polymer porous film, process for its production and battery separator A polymetaphenylene isophthalamide-based polymer porous film having a satisfactory porous structure that exhibits excellent gas permeability and heat resistance. It is produced by a process which comprises casting a dope of the polymetaphenylene isophthalamide-based... | 08/05/2008 |
| 7404896 | Modified membranes A porous polymeric membrane formed from a blend of a polymeric membrane forming material, such as polyvinylidene fluoride or polysulfone and a polymeric reactivity modifying agent adapted to modify the surface active properties of the porous polymeric membrane. The ... | 07/29/2008 |
| 7396465 | Positively charged membrane The present invention provides a positively charged microporous membrane having a protein binding capacity of about 25 mg/ml or greater comprising a hydrophilic porous substrate and a crosslinked coating that provides a fixed positive charge to the membrane. The pre... | 07/08/2008 |
| 7393383 | Separation membrane made from blends of polyimide with polyamide or polyimide-amide polymers Membranes are used to separate fluids for the production of oxygen-enriched air, nitrogen-enriched-air, for the separation of carbon dioxide from hydrocarbons, and the separation of hydrogen from various petrochemical and oil refining streams. Membranes are discusse... | 07/01/2008 |
| 7384552 | Proton-conducting membrane and the use thereof The present invention relates to a novel proton-conducting polymer membrane based on polyazoles which can, because of its excellent chemical and thermal properties, be used in a variety of ways and is particularly useful as polymer electrolyte membrane (PEM) to prod... | 06/10/2008 |
| 7368058 | Method of generating fresh water and fresh-water generator The present invention is a water processing method comprising the steps of separating boron-containing water in a reverse osmosis membrane module to provide a permeated water and subjecting a part of the obtained permeated water to boron removal using an adsorbent, ... | 05/06/2008 |
| 7364660 | Porous membrane A polyamide having an equilibrium water absorption of not more than 10% is used as a main material. As a polyamide having an equilibrium water absorption of not.more than 10%, for example, a polyamide comprising a dicarboxylic acid component comprising 60-100 mol % ... | 04/29/2008 |
| 7361272 | Anisotropic porous material The present invention is to provide an anisotropic porous material for a fluid filter which can perform a separation process of a large amount of fluid with high accuracy, which can achieve high flux, and which can improve detergent properties. The anisotropic porou... | 04/22/2008 |
| 7354392 | Structurally optimized hollow fiber membranes An elongated hollow microporous fiber comprises an inner wall surface defining an interior fiber lumen, an outer wall surface, and a microporous fiber wall therebetween, the fiber wall having one or more continuous, cohesive, elongated filaments embedded in the fibe... | 04/08/2008 |
| 7335721 | Polytetrafluoroethylene treatment One or more PTFE films are heated to greater than 150 degrees centigrade (C) and for a time greater than 20 hours, then the PTFE films are cooled. The PTFE films may be heated to temperatures greater than 200° C. and less than 250° C. and most preferably heated to... | 02/26/2008 |
| 7320756 | Method and apparatus for treatment of feedwaters by membrane separation under acidic conditions A process for treatment of water via membrane separation equipment. A feedwater is maintained or adjusted to a pH of 4.3 or lower, and fed to a membrane separation system. In this manner, species such as TOC become more ionized, and (a) their rejection by the membra... | 01/22/2008 |
| 7309424 | Filtering apparatus, back wash method therefor, filtering device and power plant A filtering apparatus having a vessel and a filter made from fluororesin and treated before filtering operation by at least one of adding thermal treatment in gas or liquid and penetrating with fluid composed of hot water or steam at a temperature of less than melti... | 12/18/2007 |
| 7300022 | Modified membranes A porous polymeric membrane formed from a blend of a polymeric membrane forming material, such as polyvinylidene fluoride or polysulfone and a polymeric reactivity modifying agent adapted to modify the surface active properties of the porous polymeric membrane. The ... | 11/27/2007 |
| 7284668 | Microporous membrane substrate having caustic stable, low protein binding surface 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... | 10/23/2007 |
| 7279097 | Composite semipermeable membrane, and production process thereof A composite semipermeable membrane which satisfies the following relationship when seawater at 25° C. having a pH of 6.5, a boron concentration of 5 ppm and a TDS concentration of 3.5% by weight is permeated under an operation pressure of 5.5 MPa: Boron removal rat... | 10/09/2007 |
| 7258767 | Solar dew tube The invention pertains to a device for the condensation of water from an aqueous liquid by using a temperature gradient, which device includes: (a) a vapor chamber that can be brought in contact with a condensation compartment wher... | 08/21/2007 |
| 7250108 | Method for measuring the local hydraulic permeability of a sub-group of hollow fibre of a bundle of hollow fibres A method is provided for measuring the local hydraulic permeability, Lpi, of a sub-group of hollow fibres of a bundle of hollow fibres mounted in a tubular casing. The method comprises a step of placing the casing containing the bundle in a vertical position, the la... | 07/31/2007 |
| 7241367 | Permeable membrane diaphragm of different layers for electroytic cells The present invention relates to a permeable membrane diaphragm of different layers for electrolytic cell, especially for chloro-alkali electrolytic cell. The diaphragm is asymmetric, which comprises at least two layers: a flow-controlling permeable layer comprising... | 07/10/2007 |
| 7223341 | Positively charged membrane The present invention provides a positively charged microporous membrane having a protein binding capacity of about 25 mg/ml or greater comprising a hydrophilic porous substrate and a crosslinked coating that provides a fixed positive charge to the membrane. The pre... | 05/29/2007 |
| 7201860 | Polyamide membrane with improved hydrolytic stability and method for production thereof The invention relates to a method for producing a hydrolytically stable polyamide membrane having an open-pored, microporous and sponge-like support-layer structure, using a process involving thermally induced liquid-liquid phase separation. A solution of an aliphat... | 04/10/2007 |
| 7195923 | Ratiometric determination of glycated protein The present invention provides methods for determining a ratio of an amount of a glycated form of a protein to a total amount of the protein in a sample containing the glycated protein, the glycosylated protein, or the glycoprotein. The method incorporates lateral f... | 03/27/2007 |
| 7189321 | Fluid treatment module having hollow membranes The invention relates to a hollow membrane (11) comprising two support layers arranged one above the other forming a space between them and a plurality of capillary tubes arranged between the support layers forming capillary channels for the flow of a first f... | 03/13/2007 |
