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| Number | Title | Issue Date |
| 7935260 | Filtering systems and methods characterized by reduced color throw Disclosed are water treatment systems and methods that are characterized by reduced leaching of color-bearing material (i.e., color-bearing leachates) into effluent water. The disclosed systems and methods may include or utilize filtering systems comprising selected... | 05/03/2011 |
| 7524422 | Clarification and sorptive-filtration system for the capture of constituents and particulate matter in liquids and gases A sorptive-filtration system for removing at least one of negatively or positively charged ions, complexes or particulates from an aqueous stream. The system includes a) flow formed substantially from at least one of rainfall-runoff or snowmelt-runoff; b) a filter c... | 04/28/2009 |
| 7357871 | Method for evaluating cation-exchange resin and method for controlling water treatment system using the same A method for a cation-exchange resin wherein a strongly acidic cation-exchange resin is contacted with an aqueous eluting solution and the polystyrenesulfonic acid being eluted from this resin is measured, which comprises setting a plurality of molecular weight rang... | 04/15/2008 |
| 7329354 | Purification of organic solvent fluids A chemical distribution system having improved organic solvent fluid purity and consistency includes a vessel containing ion-exchange media positioned within a fluid flow pathway such that the organic solvent fluid passes through the ion-exchange media, thereby effe... | 02/12/2008 |
| 7326349 | Method and apparatus for purifying alcoholic liquors After passing alcoholic liquors 20 through an HSO3 type strongly basic anion exchange resin layer 14, or after adding an HSO3 salt to alcoholic liquors; the alcoholic liquors are passed through a mixed bed layer 18 containi... | 02/05/2008 |
| 7311829 | Water conversion device A water treatment device and method for treating a quantity of water is powered by gravitational flow. The device includes an upper collecting chamber (14) and a filtration chamber (18). The filtration chamber includes a set of reactance containg at le... | 12/25/2007 |
| 7303683 | Microorganism-removing filter medium having high isoelectric material and low melt index binder A filter medium capable of removing microorganisms from a fluid such as water. The filter medium includes particles of activated carbon, particles of a substantially insoluble inorganic material having an isoelectric point greater than the fluid being filtered. A lo... | 12/04/2007 |
| 7288184 | Process for mitigating acids in a system for separating aromatic hydrocarbons from a hydrocarbon feedstream Disclosed is a process for removing acids in a system in which aromatic hydrocarbons are separated from a mixture with aliphatic hydrocarbons. The aromatic hydrocarbons are extracted from the mixture using an extracting solvent. The aromatic hydrocarbons are strippe... | 10/30/2007 |
| 7141264 | Functional water Tea-based beverages prepared from functional water are described. The functional water comprises less than 200 ppm total dissolved solids and, when used to make a tea-based beverage, results in a beverage having superior flavor and appearance characteristics, even w... | 11/28/2006 |
| 7098327 | Dual-functional ion exchange resins from agricultural by-products A process for the production of dual-functional ion exchange resins from lignocellulosic agricultural material involving anionization of the lignocellulosic agricultural material with citric acid and then cationization of the lignocellulosic agricultural material wi... | 08/29/2006 |
| 7008542 | Method for mixed mode adsorption Method for the removal of a substance from an aqueous liquid by ion exchange comprising providing a liquid with said substance is present; providing an adsorption matrix which comprises at least two different ligands; contacting the liquid with the matrix under a pe... | 03/07/2006 |
| 6869537 | Metal chelate-forming fiber, process for producing the same, method of trapping metal ion with the fiber, and metal chelate fiber A fiber capable of forming a metal chelate and a process for producing the same are disclosed, wherein the fiber is characterized in that at least one metal chelate-forming compound selected from the group consisting of aminocarboxylic acid, aminocarboxylic acid, th... | 03/22/2005 |
| 6821434 | System for removal of arsenic from water Systems for removing arsenic from water by addition of inexpensive and commonly available magnesium oxide, magnesium hydroxide, calcium oxide, or calcium hydroxide to the water. The hydroxide has a strong chemical affinity for arsenic and rapidly adsorbs arsenic, ev... | 11/23/2004 |
| 6733677 | Filter sheet and process for purifying photoresist composition employing the filter sheet A filter sheet is provided which comprises a self-supporting fibrous matrix having immobilized therein particulate filter aid and particulate ion exchange resin, wherein said particulate filter aid and particulate ion exchange resin are distributed substantially uni... | 05/11/2004 |
| 6610275 | Device for treating drinking water to make it hostile to dental plaque A device for treating potable water contains a mixed buffer of a cation exchange resin in the hydrogen ion form and an anion exchange resin, a chelating agent and a sparingly soluble calcium salt, all contained in a porous, flow-through bag.... | 08/26/2003 |
| 6602421 | Method for purifying contaminated groundwater using steel slag A method for purifying contaminated water involves passing contaminated water through a porous bed of steel slag. The steel slag can be used to remove various contaminants or reduce the concentration of such contaminants, such as heavy metals (for example... | 08/05/2003 |
| 6576139 | Process for purifying photoresist composition employing a filter sheet A filter sheet is provided which comprises a self-supporting fibrous matrix having immobilized therein particulate filter aid and particulate ion exchange resin, wherein said particulate filter aid and particulate ion exchange resin are distributed substa... | 06/10/2003 |
| 6290854 | Treatment of power plant condensate water with ion exchange resins A water treatment module and process for treating power plant condensate water utilizing a sulfonated ion exchange resin comprising copolymer beads having an interpenetrating polymer network of at least two polymer components wherein at least one of the p... | 09/18/2001 |
| 6080315 | Process for the partial desalination of water In a process for the partial desalination of water, especially of drinking water, with a mixture of weakly acid cation exchangers and strongly basic anion exchangers, whereby the charged ion exchangers are regenerated by CO2 -containing water, ... | 06/27/2000 |
| 6051140 | Water decontaminating system and method A portable point of use water decontaminating unit adapted to receive a flow of water from a faucet or other water source and pass the water through a filtering and decontaminating system to deliver the water as a continuous flow to an outlet. There is a ... | 04/18/2000 |
| 5993663 | Liquid filtering system in machine tools A liquid filtering system in machine tools which uses, in a recycling circuit, a work tank, a dirty liquid tank, a filter and a clean liquid tank in which water of a very low conductivity is used and adding at least one ferric oxide flocculent based on a ... | 11/30/1999 |
| 5976761 | Fractionation of phenol formaldehyde condensate and photoresist compositions produced therefrom A process for producing a water insoluble, aqueous alkali soluble, film forming novolak resin having low metal ions, made by the fractionation of a phenol formaldehyde condensation product, a process for producing a resin a photoresist composition of supe... | 11/02/1999 |
| 5955570 | Trace metal ion reduction by Ion Exchange Pack The present invention provides methods for solutions having a very low level of metal ions, utilizing a specially designed Ion Exchange Pack. A method is also provided for producing photoresist composition having a very low level of metal ions from novola... | 09/21/1999 |
| 5954965 | Process for producing pure water The present invention relates to a process for producing pure water having a total organic carbon content of not more than 200 ppb instantly after start of the operation of a high purity water system, comprising using as an ion exchange resin a specific s... | 09/21/1999 |
| 5942084 | Process for the separation of sulphides from pulping liquors using amphoteric resins A process using an amphoteric ion-exchange resin, also known as a "snake-cage polyelectrolyte" resin separates kraft white liquor into sulphide-rich and caustic-rich components. The sulphide-rich component can be used in the initial stage of pulping, pret... | 08/24/1999 |
| 5942122 | Method of deodorizing ion-exchanged purified water An ion-exchanged purified water having an odor substance generated from a double bed type purified water producing apparatus and a mix bed type purified water producing apparatus is flowed through a hydrogen type weak acid cation exchange resin to obtain ... | 08/24/1999 |
| 5922171 | Method and apparatus for removing sodium chloride from pulping chemicals using an amphoteric ion-exchange resin Sodium chloride is removed from pulping chemicals used in a Kraft pulping process by the use of a snake-cage polyelectrolyte ion exchange resin, coupled with removal of sulfide prior to treatment, or treatment of chemicals which are already low in sulfide... | 07/13/1999 |
| 5904854 | Method for purifying water A composite adsorbent element comprising a packed mixture of granules and fibers, which are desirably granular activated carbon (GAC) and activated carbon fiber (ACF). The element is employed as a filter for purifying tap water. In the composite adsorbent... | 05/18/1999 |
| 5830361 | Method to improve performance in precoat filter demineralizers when applied as unique condensate treatment system in BWR condensate treatment system A method for treating water in a Boiling Water Reactor system including filtration through a four component system including ion exchange resins and an inert fiber is provided, as well as a method for preparing and depositing the filter compounds. The met... | 11/03/1998 |
| 5736052 | Ion exchange resin particle separation system An apparatus for continuously separating ion exchange resin particles with upwardly flowing carrier fluid. The apparatus includes a first vertically oriented separation vessel and a first collection vessel for receiving the first fraction of resin particl... | 04/07/1998 |
| 5702611 | Process for removing heavy metal ions by ion exchange The invention is for a process of removing dissolved heavy metal cation contaminants from an organic solution. The process of the invention involves providing a mixture of a chelating ion exchange resin modified by removal of sodium ions therefrom and an ... | 12/30/1997 |
| 5674662 | Process for removing metal ions from organic photoresist solutions The invention is a process of removing metal ion contaminants from an organic solution, especially one having acid labile components. The process comprises modifying a cationic exchange resin by treatment with ammonia or amine and contacting said modified... | 10/07/1997 |
| 5571419 | Method of producing pure water Raw water is made acidic so that the pH is not more than 4.5 and heated in the presence of an oxidizing agent to decompose TOC components in the raw water, and then deionized, thereby producing ultrapure water having a greatly low concentration of organic... | 11/05/1996 |
| 5547586 | Method and apparatus for the desalination of salt containing water A method and kit for chemically rendering saline water safe to drink is disclosed. The kit includes a chemical reactant which on contact with the saline water is operable to bond with free sodium and chloride ions in the water and exchange therefore, carb... | 08/20/1996 |
| 5518628 | Purification process The invention is for a process of removal of ionic contaminants from an organic solution. The process of the invention involves providing a mixed ion exchange resin modified by contact with an ammonium salt of a weak organic acid and contacting said organ... | 05/21/1996 |
| 5500127 | Purification process A process for the purification of an organic solution containing an acid labile material. The process comprises contact of the organic solution with a combination of a cation exchange resin and an anion exchange resin. The cation exchange resin has weak a... | 03/19/1996 |
| 5431824 | Method for removing suspended impurities The improved organic polymeric adsorbent is used to adsorb and remove suspended impurities present in trace amounts in the water being treated in an apparatus for producing ultrapure water for use in the semiconductor industry or in a condensate purifier ... | 07/11/1995 |
| 5403492 | Ion exchange resin having dual morphology The invention provides a method for removing metal oxides and colloidal material from high-resistivity water streams at a relatively high removal efficiency. The method includes hydrating a highly ionized dual morphology ion exchange resin in a macroretic... | 04/04/1995 |
| 5391301 | Method of regenerating resin beads for use in water purification Water is purified to reduce pollution to less than 0.3%, by mixing re-generated and non re-generated anion and cation resins, followed by appropriate final mixing of both when re-generated, for further use.... | 02/21/1995 |
| 5387348 | Method of mixed-bed filtration and demineralization with ion-exchange resins A method of mixed-bed filtration and demineralization for removing suspended impurities from the primary cooling water in a power plant by means of a demineralizer having a mixed bed formed of a particulate cation and anion exchange resin that have such a... | 02/07/1995 |
