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| Number | Title | Issue Date |
| 7422686 | Cellulose hydrate ultrafiltration membranes and method for their production There is disclosed a process for the production of cellulose hydrate ultrafiltration membranes having improved filtration performance and the ultrafiltration membranes produced by the process. ... | 09/09/2008 |
| 7381330 | Cellulose-based microporous membrane There is disclosed a cellulosic microporous filtration membrane with upper and lower porous protective layers with a porous sponge-type intermediate layer between the two protective layers, wherein the sponge-type structure consists of two isotropic regions having d... | 06/03/2008 |
| 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 |
| 7153426 | Charged filtration membranes and uses therefor The invention relates to charged filtration membranes and their use for separation of a protein from solvent, low molecular weight solutes or a mixture of proteins. Modification of the membranes to generate charge includes modification of membrane pores to alter cha... | 12/26/2006 |
| 6632366 | Cellulose compound hollow fiber membrane The present invention relates to a cellulose compound hollow fiber membrane having high mechanical strength and is hardly degraded by microorganisms, wherein a cellulose compound is comprised as a membrane material, the thickness of the membrane is 50 to ... | 10/14/2003 |
| 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 |
| 6358754 | (Bio)chemical reagent solid phases, process for their production and their applications Novel solid phase reaction supports are disclosed. The solid phase reaction supports include (a) a solid phase carrier having a multiplicity of NH2 functional groups; (b) a coupling compound covalently bonded to an NH2 group of the solid ... | 03/19/2002 |
| 6350621 | (Bio)chemical reagent solid phases, process for their production and their applications Novel solid phase reaction supports are disclosed. The solid phase reaction supports include (a) a solid phase carrier having a multiplicity of NH2 functional groups of the Formula (I): ##STR1## in which R1 and R2 are each... | 02/26/2002 |
| 6139742 | Membrane-based sorbent for heavy metal sequestration A process is provided for making membrane-based sorbents with enhanced binding activity that are particularly useful for heavy metal sequestration. The process includes the step of selectively hydrolyzing a polyacetylated membrane in order to deacetylated... | 10/31/2000 |
| 6013182 | Selectively permeable hollow fiber membrane and process for producing same A selectively permeable hollow fiber membrane for blood dialysis consisting substantially of a cellulose derivative, which has at least a dense layer on the innermost side and a porous layer of greater void percentage on the outside, and a process for pro... | 01/11/2000 |
| 5976324 | Removal of water from reaction mixtures A process as been found for the removal of water from reaction mixtures of acids or acid anhydrides or of aqueous alkali metal hydroxide solutions with alcohols using vapor permeation/pervaporation at the boiling point of the reaction mixture, which inclu... | 11/02/1999 |
| 5891338 | Heat-sterilizable membrane Heat-sterilizable membranes are disclosed comprising at least two hydrophobic polymers which are normally immiscible with each other, and in which at least one of the hydrophobic polymers is normally unstable under sterilization conditions while at least ... | 04/06/1999 |
| 5856006 | Tobacco filter material and a method for producing the same A tobacco filter material containing fibers which have a core and a surface layer which surrounds the core, wherein the core comprises a non-esterified cellulose and the surface layer comprises a cellulose ester. The fiber may be (A) a cellulose fiber coa... | 01/05/1999 |
| 5849189 | Hollow fiber blood purifying membrane and process for its production A hollow fiber blood purifying membrane which is a hollow fiber membrane substantially composed of cellulose acetate, has a substantially non-oriented distribution of cellulose acetate polymer particles on the inner surface of the hollow fibers, has a den... | 12/15/1998 |
| 5783124 | Cellulose acetate hemodialysis membrane A cellulose acetate membrane composed of a mixture comprising a cellulose triacetate and a cellulose diacetate and having an improved heat stability, which does not substantially show a melting peak of cellulose diacetate but substantially shows a melting... | 07/21/1998 |
| 5624561 | Cellulose acetate hemodialysis membrane A cellulose acetate membrane composed of a mixture comprising a cellulose triacetate and a cellulose diacetate and having an improved heat stability, which does not substantially show a melting peak of cellulose diacetate but substantially shows a melting... | 04/29/1997 |
| 5620790 | Multi-layer microfiltration membrane having an integrated prefiltration layer and method of making same A multi-layer microfiltration membrane having an integrated prefiltration layer. Pursuant to a phase inversion process, several layers are successively poured out onto one another prior to phase separation of a lower layer, with the viscosity for the pour... | 04/15/1997 |
| 5554287 | Cellulose matrix filter material A filter material forming a filter layer consisting substantially exclusively of celluloses and cellulose derivatives. In addition to cellulose acetate fibers, the filter layer contains, in the form of additives, microcrystalline cellulose and microfine c... | 09/10/1996 |
| 5462801 | Filter Tow, method for the production thereof, as well as tobacco smoke filter element and method for its production A filter tow from cellulose acetate filaments and/or staple fibers is described on the surface of which an additive from cellulose chain-splitting enzymes is present, at least the surface of the filaments and staple fibers consisting of a cellulose acetat... | 10/31/1995 |
| 5403485 | Dialysis membrane made of cellulose acetate A dialysis membrane in the form of a hollow fiber with a continuous internal cavity is made of cellulose acetate or a cellulose acetate derivative. The hollow fiber is made by using a gas to form the internal hollow cavity. A dialysis membrane in the form... | 04/04/1995 |
| 5387345 | Cellulose acetate membranes A dialysis membrane in the form of a hollow fiber with a continuous internal cavity is made of cellulose acetate or a cellulose acetate derivative. The membrane has a maximum sieving coefficient of 0.04 for albumin with a molecular weight of 68,000. A dia... | 02/07/1995 |
| 5186842 | Method for removing low molecular weight contaminants A method of the present invention is provided for removing low molecular weight contaminants from a contaminant-containing material. This contaminant-containing material can include alcohol compounds, aldehyde compounds and peroxide compounds. The method ... | 02/16/1993 |
| 5091520 | Finely particulate cellulose esters of aromatic or aromatic-aliphatic carboxylic acids, process for their preparation, and the use thereof Finely particulate cellulose esters of aromatic or aromatic-aliphatic carboxylic acids in the form of substantially spherical, partially crystalline particles having an average diameter of 1 to 200 μm and a specific surface area of 10 to 300 m2 | 02/25/1992 |
| 5049259 | Membrane process for drying liquid hydrocarbons This invention relates to a process for drying liquid hydrocarbons using cellulosic membranes.... | 09/17/1991 |
| 4980063 | Compositions useful for preparing cellulose ester membranes for liquid separations This invention consists of a composition useful for preparing a cellulose ester membrane comprising (1) a cellulose ester, (2) glycerol monoacetate, glycerol diacetate, glycerol triacetate, or mixtures thereof, and (3) optionally glycerol, wherein the cel... | 12/25/1990 |
| 4956089 | Forming an end-cap on a filter cartridge An end-cap for a filter cartridge is formed by melting the thermoplastic material of a supporting cage and of a support pleated together with the filter medium against a heated die and embedding the end of the filter medium in the material while it is mol... | 09/11/1990 |
| 4883593 | Ultrathin-skinned asymmetric membranes by immiscible solvents treatment Improved semipermeable asymmetric fluid separation membranes useful in gas, vapor and liquid separations are disclosed. The membranes are prepared by substantially filling the pores of asymmetric cellulosic semipermeable membranes having a finely porous l... | 11/28/1989 |
| 4880545 | Ultra-filtration membranes and a method for the separation of sugars using the same Ultra-filtration membranes which may be utilized in a separation process such as the separation of monosaccharides and disaccharides from a mixture of mono- di- and higher polysaccharides will comprise an interfacial polymerized condensation product of th... | 11/14/1989 |
| 4828700 | Rejection enhancing coatings for reverse osmosis membranes Reverse osmosis membranes treated with polymers bearing carboxylic acid groups and optionally pendant hydroxyl or amide moieties display enhanced salt rejection and/or increased water flux. This treatment is particularly useful for improving the membrane ... | 05/09/1989 |
| 4808312 | Cellulose ester hollow fiber membrane for plasma separation A hollow fiber membrane made of a cellulose ester having a membrane thickness of not more than 75 μm, and having void volume (x, % by volume) of the membrane and a rate of ultrafiltration (y, ml/m2.hr.mmHg) satisfying the following formula: wh... | 02/28/1989 |
| 4755299 | Multi-layer membrane and the use thereof for the separation of liquid mixtures according to the pervaporation process A multi-layer membrane having a porous backing layer of polyacrylonitrile, polysulfone or the like, and an active separating layer of polyvinyl alcohol or cellulose acetate. The membrane is particularly suitable for the separation of water-alcohol mixture... | 07/05/1988 |
| 4746475 | Ultrathin cellulose ester polymer films and their preparation Disclosed herein are pinhole-free, ultrathin, free-standing cellulose ester films having thicknesses of 400 angstroms or less and a process to prepare them. The films find particular utility in separatory applications.... | 05/24/1988 |
| 4681713 | Method of making a hollow fiber membrane for dialysis A hollow fiber membrane of a cellulose ester for dialysis of body liquids, such as blood, and a method are described. The membrane, which has a membrane thickness of less than 20μ, and a yield strength Sb (g/filament) after heat-treatment at 8... | 07/21/1987 |
| 4659470 | Thermal casting process for the preparation of anisotropic membranes and the resultant membrane A method for providing anisotropic polymer membranes from a binary polymer/solvent solution using a thermal inversion process. A homogeneous binary solution is cast onto a support and cooled in such a way as to provide a differential in cooling rate acros... | 04/21/1987 |
| 4627850 | Osmotic capsule An osmotic capsule is disclosed for delivering a beneficial agent formulation to an environment of use. The osmotic capsule comprises an outer semipermeable wall surrounding and laminating an inner capsule wall formed of a different polymeric composition ... | 12/09/1986 |
| 4428776 | Cellulosic semipermeable membranes containing silicon compounds Semipermeable membranes prepared from at least one cellulosic polymer, such as cellulose triacetate, and containing at least one silicon compound, such as tetraethoxy silane, are useful for the separation of various gaseous mixtures into their constituent... | 01/31/1984 |
| 4371487 | Process for the production of a hollow fiber semipermeable membrane Process for production of a hollow fiber semipermeable membrane which can selectively separate the components of solution or gas mixtures, which consists essentiallly of dissolving cellulose triacetate and an organic acid and optionally a polyether in N-m... | 02/01/1983 |
| 4340481 | Membrane filtration type hollow fibers The invention concerns a membrane filtration type hollow fiber. It is composed of a single material phase which material is a chain high polymer and capable of forming fibers by the spinning of the high polymer. The cylindrical wall defining the hollow fi... | 07/20/1982 |
| 4305823 | Semipermeable membranes from modified polymers Polymers from the group consisting of cellulose and its ester and ether derivatives, of polyvinyl alcohol and its ester derivatives, copolymers with vinyl esters and homopolymers and copolymers of acrylates and methacrylates are modified with monofunction... | 12/15/1981 |
