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| Number | Title | Issue Date |
| 6994788 | Sulfonated aromatic polymers, membrane containing said polymers and a method for production and use of the same A sulfonated aromatic polymer comprising the repeating structural unit of the formula I —O—Ar1(SO3R)n—C(CF3)2—Ar1(SO3R)n—O—Ar2—(X—Ar2 | 02/07/2006 |
| 6841068 | Domestic nanofiltration membrane based water purifier without storage tank A domestic nanofiltration membrane based water purifier without a storage tank. The water purifier according to the present invention uses a nanofiltration membrane filter as a main filtering section and does not have a storage tank for containment of purified water... | 01/11/2005 |
| 6837381 | Highly permeable composite reverse osmosis membrane and method of producing the same The present invention provides a composite reverse osmosis membrane as a polyamide membrane including a side chain amino group such as a residue of a polyvinyl alcohol-based amine compound represented by Formula 1. Such a membrane can remove organic impurities under... | 01/04/2005 |
| 6622872 | Micromachined membrane particle filter using parylene reinforcement A micromachined membrane particle filter is formed by making holes in a silicon derivative overlayer and coating over the holes with Parylene.... | 09/23/2003 |
| 6558546 | pH dependent membrane diffusion 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 proper... | 05/06/2003 |
| 6372136 | Cellulose acetate semipermeable membrane and process for producing the cellulose acetate semipermeable membrane To provide a cellulose acetate semipermeable membrane having a high filtration rate and high mechanical strength and which is hardly degraded by microorganisms, the present invention provides a cellulose acetate semipermeable membrane containing a cellulo... | 04/16/2002 |
| 6280853 | Composite membrane with polyalkylene oxide modified polyamide surface A composite membrane and method for making the same, comprising a porous support and a crosslinked polyamide surface having polyalkylene oxide groups grafted thereto. The subject membrane provides improved resistance to fouling while offering excellent fl... | 08/28/2001 |
| 6126825 | Microporous membrane and process for the production thereof The present invention relates to a microporous membrane and a process for producing thereof, especially a microporous membrane which can be used for microfiltration, has excellent resistance to chemicals, and a process for producing thereof. The present i... | 10/03/2000 |
| 5776324 | Electrochemical biosensors An electrochemical biosensor for determining the level of a target chemical in a biological fluid includes an electrochemical system including a enzyme substrate which reacts with the target chemical to yield a system signal related to the concentration i... | 07/07/1998 |
| 5262056 | Polyamides and polypyrrolones for fluid separation membranes Polyamide and polypyrrolone membranes for fluid separation having desirable permeabilities, solubilities, diffusivities,, high glass transition temperatures and large fractional free volumes. In particular, the membranes are the polyamide and polypyrrolon... | 11/16/1993 |
| 5075006 | Isocyanurate crosslinked polyurethane membranes and their use for the separation of aromatics from non-aromatics The present invention is directed to non-porous isocyanurate-crosslinked polyurethane membranes. These membranes are useful for the separation of aromatic hydrocarbons from non-aromatic hydrocarbons. The separation can be performed using any commonly acce... | 12/24/1991 |
| 5012036 | Polyarylate membranes or aromatics/saturates separation (C-2415) The present invention describes a method for separating mixtures of aromatics and non-aromatics into aromatic-enriched and non-aromatic-enriched streams by contacting the aromatic/non-aromatics mixture with one side of a polyarylate membrane and selective... | 04/30/1991 |
| 5009824 | Process for preparing an asymmetrical macroporous membrane polymer A process for preparing an asymmetrical macroporous membrane from a polymer solution comprised as the dissolved portion fraction a polymeric mixture comprised of about 5-70% by weight of polyvinylpyrrolidone having a molecular weight of ࣙ100,000 Dalton ... | 04/23/1991 |
| 4976860 | Conjugated polymer-cation exchanger composite membrane Disclosed is a conjugated polymer-cation exchanger composite membrane suitable for a charge-mosaic membrane which is easily prepared and has excellent mechanical or chemical strength and good properties for charge-mosaic membrane. The composite membrane o... | 12/11/1990 |
| 4968331 | Organic polymer separation membrane having fluorene skeleton and oxygen enrichment device utilizing same A separation membrane consisting of a polyamide having a unit (I) or a mixing of polyamides having units (I) and (II) and (II') or a polyester having a unit (III) or (IV) and (IV') or a mixture of polyesters having unit (III) and (IV) and (IV'): --HN--X--... | 11/06/1990 |
| 4964890 | Aromatic polyether ketones Polyether ketones based on diphenols corresponding to the following general formula (I): ##STR1## wherein R1 and R2, independently represent hydrogen, halogen, C1 -C8 alkyl, C5 or C6 c... | 10/23/1990 |
| 4950405 | Functional thin organic membrane A functional thin organic membrane comprising a monomolecular film which contains at least one organic amphoteric host molecule having a reactive functional group capable of chemically binding with a nucleophilic functional group at room temperature.... | 08/21/1990 |
| 4948508 | Surface-hydrophilic, highly selective semipermeable membrane A surface-hydrophilic, highly selective semipermeable membrane comprising a semipermeable membrane of a hydrophobic polymer and a hydrophilic segment having at least one end directly bonded to at least one surface of the semipermeable membrane is disclose... | 08/14/1990 |
| 4908135 | Moiety for selective separation New C-substituted crown ethers such as ##STR1## are made by reacting a 1,2-diol (chain length m'4) with ClCH2 --(CH2 --O--CH2 --)n+1 CH2 Cl. These compounds have a stronger affinity for secondary amin... | 03/13/1990 |
| 4876009 | Tetrakis-amido high flux membranes Composite RO membranes of a microporous polymeric support and a polyamide reaction product of a tetrakis-aminomethyl compound and a polyacylhalide are disclosed, said membranes exhibiting high flux and good chlorine resistance.... | 10/24/1989 |
| 4867881 | Orientied microporous film A microporous article is provided. The article comprises a thermoplastic polymeric structure having a plurality of cells with adjacent cells being interconnected by passageways to provide a network of communicating pores. The structure is oriented in at l... | 09/19/1989 |
| 4830885 | Chlorine-resistant semipermeable membranes Chlorine-resistant semipermeable membranes which comprise an interfacial polymerized reaction product composite on a porous support backing material may be prepared by contacting a porous support material such as polysulfone with an aqueous solution of an... | 05/16/1989 |
| 4737286 | Microfiltration membrane filter A microfiltration membrane is made up dissolving m-phenylenediamine-isophthalic acid polymer, a high temperature aromatic polyamide, in one or more solvents selected from the group which consists of N-methylpyrrolidone, dimethylformamide and dimethylaceta... | 04/12/1988 |
| 4722795 | Polyamide hollow fiber filtration membrane having barrier layer A filtration membrane is disclosed which has an ultrafiltration rate of between 200×10-4 and 500×10-4 ml/sec.×cm2 ×bar at 20° C. and which is substantially impermeable to albumin of a molecular weight of about 44,000 ... | 02/02/1988 |
| 4720343 | Macroporous asymmetrical hydrophilic membrane made of a synthetic polymer Disclosed are asymmetrical macroporous membranes based on a synthetic polymer comprising a polymeric mixture of 5 to 70% by weight polyvinylpyrrolidone having a molecular weight ࣙ100,000 Dalton and 95 to 30% by weight of a polymer selected from a group ... | 01/19/1988 |
| 4705632 | Hollow fiber membrane formed from a block copolymer of aromatic polyester and polyoxyethylene for dialysis of blood A hollow fiber membrane for the dialysis of blood is formed by melt-spinning a block copolymer which has a reduced viscosity of 1.5 to 4.0 and is comprised of 30 to 60% by weight of an aromatic polyester having a water absorption up to 1% by weight and 40... | 11/10/1987 |
| 4690766 | Chemically modified semipermeable polysulfone membranes and their use in reverse osmosis and ultrafiltration Semipermeable membranes of modified polysulfones are provided which comprises repeating units of the formula wherein M1 and M2 are independently a valence bond, --O-- or --NH--, R1 is a valence bond or a group of the formula ... | 09/01/1987 |
| 4690765 | Chemically modified semipermeable membranes and their use in reverse osmosis and ultrafiltration Semipermeable membranes of modified polysulfones are provided which comprises repeating units of the formula wherein M1 and M2 are independently a valence bond, --O-- or --NH--, R1 is a valence bond or a group of the formula ... | 09/01/1987 |
| 4661257 | Liquid membrane system for the removal of nitrate from water Quaternary ammonium salts are disclosed which are highly effective as complexing agents for the extraction of hydrogen ion and anions such as nitrate from an aqueous feed solution via a coupled ion transport mechanism employing supported liquid membranes.... | 04/28/1987 |
| 4643829 | Multilayer reverse osmosis membrane in which one layer is poly-meta-phenylene cyclohexane-1,3,5-tricarboxamide A multilayer membrane for performing reverse osmosis is disclosed. The membrane comprises a porous support and a layer formed of poly meta-phenylene cyclohexane-1,3,5-tricarboxamide. The preferred material for forming the support is a polysulfone.... | 02/17/1987 |
| 4613440 | Composite membranes based on interpenetrating polymer networks Semipermeable composite membranes which comprise an interpenetrating polymer network of the reaction product of a polyether and an isocyanate with a heterocyclic nitrogen-containing compound composited on a porous backing support material may be used in s... | 09/23/1986 |
| 4612118 | Composite semipermeable membrane of polyamine and trianzine A composite semipermeable membrane which comprises a porous substrate and an ultrathin dense layer having solute removal performance formed on said substrate by polymerization by crosslinking of a reactive material composed of at least one material select... | 09/16/1986 |
| 4608172 | Plasmapheresis membrane and process for the preparation thereof Plasmapheresis membranes of hydrophilic polycarbonates are disclosed, comprising polycondensates of bisphenol A and a polyalkylene oxide. These membranes which have a regular pore structure with smoothly rounded pores with openings without sharp edges, ha... | 08/26/1986 |
| 4607070 | Polyether-copolycarbonates for dialysis membranes The present invention is directed to a process for the preparation of a segmented, aliphatic-aromatic polyether-copolycarbonate containing structural units conforming to ##STR1## wherein --D-- is a diphenolate radical and units conforming to ##S... | 08/19/1986 |
| 4601827 | Multistage annealing of aramide reverse osmosis membranes A process for forming a reverse osmosis membrane is disclosed. The process involves casting a solution of an aromatic polyamide and a modifying salt to form a layer which is dried and quenched with water to gel the aromatic polyamide, and annealed in wate... | 07/22/1986 |
| 4600507 | Filter device for liquids A filter device capable of simultaneously effecting centrifugal separation and filtration comprises a hollow main body closed at one end thereof and adapted for effective use in a centrifuge, at least one filter medium disposed inside the hollow main body... | 07/15/1986 |
| 4584359 | Vinyl polymer membranes A membrane of a vinyl polymer which contains groups of the formula ##STR1## where R1, R2, R3 and R4 are each hydrogen, methyl, methoxy, fluorine or trifluoromethyl and R5 is --CH2 --CH... | 04/22/1986 |
| 4477634 | Modified acrylonitrile polymer containing semipermeable membranes Semipermeable membranes of polyacrylonitrile or copolymers of acrylonitrile and other ethylenically unsaturated monomers are chemically modified through reaction with (a) hydroxylamine and (b) a poly functional ionic colorless cyclic carbonic acid imide-h... | 10/16/1984 |
| 4471110 | Polyamide of disulfonated diamine and permselective membrane thereof Aromatic polyamides which include units based on disulfonated aromatic diamines, the sulfonate groups being present as sulfonic acid groups or alkali metal, alkaline earth metal, transition metal, aluminum, ammonium or lower alkyl quaternary ammonium salt... | 09/11/1984 |
| 4468501 | Cross-linked polyphenylene oxide Cross-linked polyphenylene oxide compositions comprise the reaction product of an alkyl halogenated phenylene oxide polymer and ammonia. The cross-linkage between phenylene groups is benzyl amine linkage represented by the structural formula --CH2 | 08/28/1984 |
