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| Number | Title | Issue Date |
| 7320942 | Method for removal of metallic residue after plasma etching of a metal layer A method for removal of metallic residue from a substrate after a plasma etch process in a semiconductor substrate processing system by cleaning the substrate in a hydrogen fluoride solution. ... | 01/22/2008 |
| 7282187 | Recovery of metal values A process for selectively extracting metal values, including, uranium, thorium, scandium and zirconium, from starting materials which include the metal values. The process is particularly well suited to extracting metal and recovering metal values from tantalum/niob... | 10/16/2007 |
| 7276225 | Process for producing niobium and tantalum compounds A process for producing valve metal oxides, such as tantalum pentoxide or niobium pentoxide with a narrow particle size distribution within a desired particle size range, is provided. According to the process of the present invention, the valve metal fraction from d... | 10/02/2007 |
| 7214362 | Purification method for producing high purity niobium compound and/or tantalum compound An object of the present invention is to provide a method for purifying a highly pure niobium compound and/or tantalum compound, the method enabling the purification of a highly pure niobium compound and tantalum compound in a simplified manner at a low cost. The ob... | 05/08/2007 |
| 7182925 | Tantalum concentrates dissolution and purification method A method for the dissolution and purification of tantalum ore and synthetic concentrates is described. The method preferably uses ammonium bifluoride as the fluoride source in place of the hydrofluoric acid used in the conventional methods. Other fluoride compounds ... | 02/27/2007 |
| 7175823 | Purification method for producing high purity niobium compound and/or tantalum compound The present invention provides a method enabling the high purification of a niobium compound and/or tantalum compound in a simplified manner at a low cost. This is accomplished by providing a method enabling the high purification of a niobium compound and/or tantalu... | 02/13/2007 |
| 7100360 | Pulsed combustion engine A pulsed combustion device includes a support structure and a combustor carousel supported by the support structure and rotating relative thereto about an axis. The carousel has a number of combustion conduits in a circumferential array. Each conduit cyclically rece... | 09/05/2006 |
| 7025899 | Concentrated solutions of oxime metal extractants and method of formulating extractant compositions therefrom The preparation of concentrated solutions of oxime metal extractants, such as aldoximes and ketoximes, or mixtures of aldoxime and ketoxime, and the use thereof in formulating or preparing extraction reagent compositions for use in an extractant organic phase in a p... | 04/11/2006 |
| 6709641 | Method for extracting anions The invention relates to a method of extracting anions based on metals of groups IV B to VIII of the periodic table from aqueous solutions thereof, wherein compounds of general formula are used as extractants, in which a... | 03/23/2004 |
| 6652819 | Production of high purity vanadium compound from vanadium-containing carbonaceous residues A process for the production of a vanadium compound from carbonaceous residues containing vanadium, which includes the steps of: (a) combusting the carbonaceous residues at a temperature of 500-690° C. in an oxygen-containing gas to form vanadium-containi... | 11/25/2003 |
| 6576099 | Oxygen reduced niobium oxides Methods to at least partially reduce a niobium oxide are described wherein the process includes heat treating the niobium oxide in the presence of a getter material and in an atmosphere which permits the transfer of oxygen atoms from the niobium oxide to ... | 06/10/2003 |
| 6267936 | Method for effecting solvent extraction of metal ions using hydrocarbon soluble aminomethylene phosphonic acid compounds Solvent extraction of one or more metal ions from an aqueous solution in the presence of hydrocarbon-soluble aminomethylenephosphonic acid derivatives.... | 07/31/2001 |
| 6180072 | Process to recover metals from spent catalyst There is provided a process to reclaim metals from catalysts, said process comprising collecting one or more catalyst containing at least one metal sulfide; leaching the catalyst in an atmospheric leach step; separating the leached slurry into a first liq... | 01/30/2001 |
| 6010676 | Method for making a highly pure tantalum compound Highly pure tantalum compounds are made by slurrying hydrated ammonium tantalum oxide or tantalum hydroxide with concentrated sulfuric acid followed by dissolution with concentrated hydrofluoric acid. After diluting the concentrated acidic solution with w... | 01/04/2000 |
| 5945342 | Method for digesting spent ion exchange resins and recovering actinides therefrom using microwave radiation The present invention relates to methods for digesting diphosphonic acid substituted cation exchange resins that have become loaded with actinides, rare earth metals, or heavy metals, in a way that allows for downstream chromatographic analysis of the ads... | 08/31/1999 |
| 5891407 | Process for producing pure ammonium metallates The present invention relates to a process for the production of pure ammonium metallates of the metals W, Mo, V, Cr and Re, wherein alkaline metal salt solutions are adjusted to a pH value in the range from 5 to 9 by reaction with CO2, these m... | 04/06/1999 |
| 5881358 | Composition for extracting transition metal and method for extracting transition metal using the same A composition for extracting a transition metal which comprises as an active ingredient a cyclic phenol sulfide represented by the following formula (1): ##STR1## wherein X represents a hydrogen atom, a hydrocarbon group, an acyl group, a carbox... | 03/09/1999 |
| 5866750 | Method for removal of metal alkoxide compounds from liquid hydrocarbon A method for recovering titanium and vanadium compounds, such as alkoxides, from a liquid hydrocarbon mixture by hydrolyzing the mixture with a base or acid wash having a sufficiently different density so that two liquid phases form, and separating the tw... | 02/02/1999 |
| 5723098 | Process for the recovery of catalysts in adipic acid production The invention relates to a process for the selective recovery of catalysts used in the production of adipic acid by (a) separating adipic acid from the reaction solution, (b) exposing the resultant reaction solution to a sulfonated ion exchanger, thereby bindi... | 03/03/1998 |
| 5682593 | Extraction of acids and metal salts from aqueous solutions with diethyl dodecylphosphonate Use of diethyl dodecylphosphonate (DEDP) for the extraction of acids and metal salts from aqueous solutions.... | 10/28/1997 |
| 5478539 | Process for the recovery of metals Metal values (especially uranium values) are extracted from aqueous solutions of metal oxyions in the absence of halogen ion using an imidazole of defined formula. Especially preferred extractants are 1-alkyl imidazoles and benzimidazoles having from 7 to... | 12/26/1995 |
| 5437848 | Recovery of metal values from process residues A process for recovering metal and acid values from a source material containing metallic fluorides comprises digesting the source material in sulfuric acid to form a slurry, separating a fluoride containing solid phase and a metal containing first liquid... | 08/01/1995 |
| 5431892 | Process for recovering valuable metal from waste catalyst A process for recovering valuable metals from a waste catalyst based on an alumina carrier includes (a) roasting the waste catalyst at a temperature range of 400° to 1,000° C. to obtain a roasted product; (b) preparing a reduction dissolution by dissolv... | 07/11/1995 |
| 5411724 | Method for substitution of alumina in the framework of zeolites by silicon Aluminum can be removed from tetrahedral framework sites of zeolite frameworks and substituted with elements such as silicon, gallium, titanium or zirconium. The process involves three steps: (a) forming a mixture of the ammonium or alkaline metal form of the ... | 05/02/1995 |
| 5332420 | Chemical process of separating metals from an organic complex A method for the recovery of a metal from an organic complex thereof, said method comprising treating the complex with a weakly acid aqueous solution of an alkali metal or alkaline earth metal chloride having a chloride content of at least 4 molar whereby... | 07/26/1994 |
| 5330731 | Process for separation of zirconium-88, rubidium-83 and yttrium-88 A process for selective separation of strontium-82 and strontium-85 from proton irradiated molybdenum targets is provided and includes dissolving the molybdenum target in a hydrogen peroxide solution to form a first ion-containing solution, passing the fi... | 07/19/1994 |
| 5296203 | Recovery of niobium from irradiated targets A process for selective separation of niobium from proton irradiated molybdenum targets is provided and includes dissolving the molybdenum target in a hydrogen peroxide solution to form a first ion-containing solution, contacting the first ion-containing ... | 03/22/1994 |
| 5271910 | Process of treating metal chloride wastes A process of treating metal chloride wastes produced by chlorination of titanium ore comprises the steps of: (a) leaching said metal chloride wastes in a hydrochloric acid (HCl)-containing solution to obtain a solution containing solids and dissolved meta... | 12/21/1993 |
| 5260039 | Process for the two-phase extraction of metal ions from phases containing solid metal oxides, agents and the use thereof A process is disclosed for the two-phase extraction of metal ions from phases containing solid metal oxides, which is characterized in that the solid metal oxides are brought into contact with a hydroxamic acid, known per se, dissolved in a hydrophobic or... | 11/09/1993 |
| 5230876 | Removal of vanadium from phosphoric acid An apparatus for removing vanadium from phosphoric acid includes a precipitator that receives vanadium-containing process-feed phosphoric acid and adds an oxidant to the process-feed phosphoric acid, whereupon precipitates containing phosphorus and vanadi... | 07/27/1993 |
| 5213777 | Process for the recovery of metals Metal values (especially uranium values) are extracted from aqueous solutions of metal oxyions in the absence of halogen ion using an imidazole of defined formula. Especially preferred extractants are 1-alkyl imidazoles and benzimidazoles having from 7 to... | 05/25/1993 |
| 5209910 | Process for the recovery and separation of tantalum and niobium Improved solvent extraction recovery of tantalum and niobium oxides from an acid solution of raw materials containing such oxides wherein the charged organic solvent [e.g., MIBK] is washed out (a) with 8-16N sulfuric acid and then (b) with water or dilute... | 05/11/1993 |
| 5194232 | Process for the preparation of tantalum/niobium hydroxides and oxides with a low fluoride content Fluorine content of tantalum and niobium hydroxides is reduced to under 0.5 weight % by washing such hydroxide precipitates (as obtained by HF digestion and solvent extraction) with dilute ammonia (1 to 10%) and then water in two washing stages. The first... | 03/16/1993 |
| 5190735 | Recovery of germanium-68 from irradiated targets A process for selective separation of germanium-68 from proton irradiated molybdenum targets is provided and includes dissolving the molybdenum target in a hydrogen peroxide solution to form a first ion-containing solution, contacting the first ion-contai... | 03/02/1993 |
| 5182026 | Resins having improved exchange kinetics Disclosed are novel ion-exchange and chelate-exchange resins having improved exchange kinetics for separating chemical species from liquids. The resins are prepared from copolymer beads consisting of a monovinyl aromatic monomer and a cross-linking monome... | 01/26/1993 |
| 5171548 | Process for the removal of vanadium from wet process phosphoric acid A process for removal of vanadium from wet process phosphoric acid comprising the steps of; (i) adsorbing an anionic pentavalent complex of vanadium, derived from the wet process phosphoric acid, onto an anion exchange resin or into an organic layer; and ... | 12/15/1992 |
| 5167938 | Process for strontium-82 separation A process for selective separation of strontium-82 and strontium-85 from proton irradiated molybdenum targets comprises dissolving the molybdenum target in a hydrogen peroxide solution to form a first solution containing ions selected from a group consist... | 12/01/1992 |
| 5141965 | Resins having improved exchange kinetics Disclosed are novel ion-exchange and chelate-exchange resins having improved exchange kinetics for separating chemical species from liquids. The resins are prepared from copolymer beads consisting of a monovinyl aromatic monomer and a cross-linking monome... | 08/25/1992 |
| 5112873 | Resins having improved exchange kinetics Disclosed are novel ion-exchange and chelate-exchange resins having improved exchange kinetics for separating chemical species from liquids. The resins are prepared from copolymer beads consisting of a monovinyl aromatic monomer and a cross-linking monome... | 05/12/1992 |
| 5078978 | Pyridine-containing alkoxysilanes bonded to inorganic supports and processes of using the same for removing and concentrating desired ions from solutions A method is disclosed for the quantitative removal and concentration of desired transition metal ions from a source solution which may contain larger concentrations of other metal and H+ ions. The method comprises bringing the source solution ... | 01/07/1992 |
