Did You Know...
...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7604785 | Process for the recovery of elemental sulphur from residues produced in hydrometallurgical processes The present invention relates to a process for the recovery of elemental sulphur from residues produced in hydrometallurgical processes based on leaching with a solution of sodium sulphide in which the sulphur contained in the residues is selectively leached as sodi... | 10/20/2009 |
| 7067068 | Method for preventing lead from dissolving from a lead-containing copper-based alloy A lead-containing copper-based alloy is immersed into a weak acidic or neutral etching solution having a buffer effect which is formed by adding an organic acid into a complexing agent having a high ability to form a complexing ion with lead, and lead particles pres... | 06/27/2006 |
| 6843970 | Process for recovering metal values by dissolving them in a sulfuric acid solution containing a carbon source and a reducing agent A process for recovering metal values from a metal containing material including the metal values comprising digesting the metal containing material in a sulfuric acid solution comprising sulfuric acid, a reducing agent, and a carbon source, heating the digestion mi... | 01/18/2005 |
| 6793908 | Method for preparing ITO nanometer powders A solution method for preparing indium-tin oxide (ITO) powders is provided. Indium compounds and tin compounds are dissolved in water respectively to form two solution bodies. Some proper additives are added into the solution bodies to form metal hydroxyl compounds ... | 09/21/2004 |
| 6777511 | Process for producing poly (meth) acrylates having reduced metal content An industrially excellent process for producing a poly(meth)acrylate having a reduced metal content which comprises contacting a mixture of a poly(meth)acrylate and an organic solvent with an acidic aqueous solution, such as an aqueous solution obtained by dissolvin... | 08/17/2004 |
| 6608001 | Catalyst and method of making micrometer sized spherical particles A method for producing small spherical particles that are especially useful as catalysts and catalyst supports employed in chemical processes is disclosed. According to some embodiments, the method includes impregnating a porous support with a metal or me... | 08/19/2003 |
| 6500395 | Method for removing metals from air pollution control residues A method for the treatment of air pollution control (APC) residues comprising the steps of washing the residues at least one time in an alkaline solution maintained at a pH not lower than about 11.5, separating the alkaline washed residues from the alkali... | 12/31/2002 |
| 6482371 | Process for separation of heavy metals and halogen from waste material or residue A process for the separation of heavy metal and halogen from unwanted waste material or residue. Halogen is selectively extracted or washed out from the waste material. Metal is selectively extracted or washed out from the essentially halogen free waste m... | 11/19/2002 |
| 6409978 | Method of removing impurities from mineral concentrates A process for removing impurities contained in the crystal lattice of minerals, comprising the steps of forming a mixture of a mineral capable of structurally reorganizing its crystal lattice which contains an impurity in its crystal lattice and a halogen... | 06/25/2002 |
| 6403045 | Method for treating residues resulting from the purification of garbage and/or industrial waste incineration fumes A method for treating residues derived from garbage and/or industrial waste incineration fumes including the steps of desalting the residues by washing with sodium carbonate in sufficient amount or slightly in excess to solubilize all the salts including ... | 06/11/2002 |
| 6319482 | Treatment of fly ASH/APC residues including lead salt recovery The present invention relates to a process for treating fly ash/APC residues chlorides, sulphates, earth alkali metals selected from the group consisting of calcium, potassium, and sodium, and heavy metals selected from the group consisting of lead, which... | 11/20/2001 |
| 6197210 | Process for treating brass components to substantially eliminate leachabale lead A process for the treatment of brass components to reduce leachable lead therefrom when the components are exposed to water which includes the steps of first cleaning the brass components with a cleaning agent in the form of a mineral acid, a mineral acid... | 03/06/2001 |
| 6153155 | Recovery of the transition metal component of catalyst used in heavy feed hydroconversion The invention relates to a process for recovering the transition metal component of catalysts used in the hydroconversion of heavy hydrocarbonaceous materials. In accordance with the invention, a slurry of a transition metal catalyst and hydrocarbon is ca... | 11/28/2000 |
| 6117209 | Hydrometallurgical process for treating alloys and drosses to recover the metal components A hydrometallurgical method involves treating a dross source containing typically both antimony and tin and treating the dross to a series of chemical operations to yield a soft lead precursor, suitable for making soft lead for lead-based alloys for batte... | 09/12/2000 |
| 6090353 | Method of removing impurities from mineral concentrates A process for removing impurities contained in the crystal lattice of minerals, comprising the steps of forming a mixture of a mineral capable of structurally reorganizing its crystal lattice which contains an impurity in its crystal lattice and a halogen... | 07/18/2000 |
| 6027543 | Method for removing a heavy metal from sludge A method for removing a heavy metal from sludge, including the step of putting the sludge into contact with a treating liquid to dissolve the heavy metal contained in the sludge into the treating liquid. The treating liquid is formed of either A or B, whe... | 02/22/2000 |
| 6022406 | Method for preparing inorganic pigments, resulting inorganic pigments, and apparatus therefor A method for preparing inorganic pigments from steel mill dust, particularly electric steel mill dust, wherein (a) the dust is separated into a magnetic fraction and a non-magnetic fraction; (b) the non-magnetic fraction is subjected to a basic leaching r... | 02/08/2000 |
| 5961691 | Recovery of lead and others metals from smelter flue dusts The present invention is concerned with a process for extracting and recovering lead or lead derivatives in high purity from various materials containing lead sulphate, and particularly copper smelter flue dusts. The present process also allows the substa... | 10/05/1999 |
| 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 |
| 5879830 | Process for regenerating sodium sulphide from the sodium sulphate which forms in treating lead paste from exhausted batteries A process is disclosed for treating lead paste from exhausted batteries. Calcium sulfite and calcium thiosulfite are formed by the reaction: 3Ca(OH)2 +4S°.fwdarw.2CaS+CaS2 O3 +3H2 O(1). The CaS and CaS2 O... | 03/09/1999 |
| 5840262 | Process for the manufacture of pure lead oxide from exhausted batteries The present invention relates to an improved process for producing lead oxide in a pure state from a spent paste resulting from exhausted acid batteries. The spent paste is first calcined and desulfurized, then leached by a concentrated solution comprisin... | 11/24/1998 |
| 5770170 | Recovery of zinc from sulphidic concentrates There is provided a novel class of additives, specifically coals, which are useful in zinc extraction processes involving one or more pressure leach stages carried out at temperatures above the melting point of sulphur. Such processes may include those in... | 06/23/1998 |
| 5744107 | Process for removing heavy metals from soil Heavy metals are efficiently removed from contaminated soil by a process which comprises leaching or washing the soil with a mild leachant solution. The leachant solution is comprised of an aqueous solution of an acid and a salt. The anion of the acid for... | 04/28/1998 |
| 5660806 | Process for removing lead from sandblasting wastes containing paint chips Heavy metals are efficiently removed from contaminated soil by a process which comprises leaching or washing the soil with a mild leachant solution comprised of an aqueous solution of an acid and a salt. Heavy metals are also efficiently removed from pain... | 08/26/1997 |
| 5630931 | Process for the hydrometallurgical and electrochemical treatment of the active mass of exhausted lead batteries, to obtain electrolytic lead and elemental sulphur A hydrometallurgical and electrochemical process for treating exhausted lead batteries, in particular the active mass and the electrolyte, is described having as products electrolytically obtained lead and elemental sulphur. The active mass (paste) obtain... | 05/20/1997 |
| 5607060 | Method and apparatus for removing metal contamination from soil The invention is a process and an apparatus for removing metal contamination from soil. In the method, the soil is treated to produce soil with a small particle size. The particulate soil is then separated into a coarse fraction and a fine fraction. The c... | 03/04/1997 |
| 5549811 | Process for decontamination soils polluted with metals The invention relates to a hydrometallurgical process for decontaminating soils 1 which are polluted with metallic elements, comprising a stage of basic leaching I so as to bring about the dissolution of the metallic elements to be removed, a cementation ... | 08/27/1996 |
| 5512257 | Process for the treatment of flue particulates Fly ash from incineration plants is treated with an acidic aqueous solution for the purpose of removing heavy metals. The residual solid matter is filtered. The filtration residue is treated with a precipitating agent for heavy metals. The thereby obtaine... | 04/30/1996 |
| 5505925 | Process for removing heavy metals from soil Heavy metals are efficiently removed from contaminated soil by a process which comprises leaching or washing the soil with a mild leachant solution comprised of an aqueous solution of an acid and a salt. Heavy metals are also efficiently removed from pain... | 04/09/1996 |
| 5494649 | Process for removing heavy metals from paint chips Heavy metals are removed from paint chips by leaching with an aqueous acid. Heavy metals are also efficiently removed from contaminated soil by a process which comprises leaching or washing the soil with a mild leachant solution comprised of an aqueous so... | 02/27/1996 |
| 5466426 | Method and apparatus for removing metal contamination from soil The invention is a process and an apparatus for removing metal contamination from soil. In the method, the soil is treated to produce soil with a small particle size. The particulate soil is then separated into a coarse fraction and a fine fraction. The c... | 11/14/1995 |
| 5464596 | Method for treating waste streams containing zinc A method for the recovery of zinc products, including zinc oxide and elemental zinc, and optionally iron-carbon feedstocks, from industrial waste streams containing zinc and iron, by treating the waste streams with carbon and an ammonium chloride solution... | 11/07/1995 |
| 5453111 | Method for separation of metals from waste stream A method for the recovery of metals including zinc, zinc oxide, iron-carbon feedstocks, lead and cadmium from industrial waste streams which entails treating the waste streams with carbon and an ammonium chloride solution, separating any undissolved compo... | 09/26/1995 |
| 5451382 | Process and plant for removing lead, cadmium and zinc from dusts To remove lead, cadmium and zinc from dusts produced in the electrostatic precipitator in the electrothermal production of yellow phosphorus, the dusts are first digested by phosphoric acid having a content of at least 25% by weight of P2 O | 09/19/1995 |
| 5342449 | Process for the decontamination of toxic, heavy-metal containing soils The present invention relates to the decontamination of soil and the like and, in particular, soils which are contaminated with metal as a result of the activities of human beings. The invention provides a physical and a chemical means for treating soil a... | 08/30/1994 |
| 5282938 | Process for recovery of trace metals and salts from waste combustion residues A method for the continuous treatment of air pollution control residues from various resource recovery systems whereby the air pollution control residue is treated with a dilute salt extracting solution at a pH chosen to maximize the recovery of lead, for... | 02/01/1994 |
| 5277882 | Process for recovering germanium A germanium bearing sulphate solution containing indium and/or gallium is brought at pH 1-2.5 into contact with an organic phase, containing a substituted 8-hydroxyquinoline and an acid organophosphorus compound. So, in addition to germanium, indium and g... | 01/11/1994 |
| 5277883 | Recovery of metal values from aqueous solutions A process is described for recovering metal values, e.g., gallium, contained in an aqueous solution by extraction comprising the steps of contacting the aqueous solution with a water immiscible organic phase comprising a water-insoluble substituted 8-hydr... | 01/11/1994 |
| 5268128 | Method and apparatus for cleaning contaminated particulate material Particulate material is treated by first washing the contaminated material with a contaminant mobilizing solution comprising a leaching agent, a surfactant or a mixture thereof. Large particles, typically greater than 5 mm are mechanically separated, wash... | 12/07/1993 |
| 5264191 | Quaternary ammonium trihalide and method for dissolution of metal with liquid containing the compound A quaternary ammonium trihalide, a novel compound, represented by the formula: [A--R']+ .multidot.X3- (wherein A stands for a trialkyl-amino radical or a pyridyl radical, R' for an alkyl radical of 6 to 22 carbon atoms, and X f... | 11/23/1993 |
