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| Number | Title | Issue Date |
| 4832925 | Recovery of zinc from zinc-containing sulphidic material A process for the recovery of zinc from zinc-containing sulphidic material which also contains iron and from zinc oxide containing material, at least one of the materials containing lead and/or silver values. The process includes leaching zinc-containing ... | 05/23/1989 |
| 4821800 | Filtering media for controlling the flow of sand during oil well operations Sand is filtered from an oil flow from a sand-containing oil producing formation or interval of an oil well by passing the oil flow with entrained sand through a filter assembly containing filtering media in the form of a body of juxtaposed composite part... | 04/18/1989 |
| 4746378 | Process for producing Sm2 Co17 alloy suitable for use as permanent magnets A process for producing an Sm2 Co17 alloy suitable for use as a permanent magnet, the alloy also containing iron, copper and zirconium or a similar group IVB or VB transition metal, and optionally praseodymium in partial replacement ... | 05/24/1988 |
| 4709148 | Quadrupole mass spectrometers A quadrupole mass spectrometer has a housing containing pole rods which define a passage through which ions can pass when the housing is evacuated. RF voltage is supplied to the pole rods to cause ions only of a predetermined mass/charge ratio to pass thr... | 11/24/1987 |
| 4645532 | Production of fine spherical copper powder A process for the production of fine copper powder with particles having a size less than about 5 micrometers, comprises providing an ammoniacal cuprous salt solution, and neutralizing ammonia in said solution with acid in a substantially oxygen-free envi... | 02/24/1987 |
| 4632701 | Process for the recovery of silver from a residue essentially free of elemental sulphur A process for the recovery of silver from a residue essentially free of elemental sulphur obtained by acidic pressure oxidation leaching or iron-containing sulphidic material which comprises forming a slurry of the residue with lime at a temperature of at... | 12/30/1986 |
| 4610724 | Recovery of gold from refractory auriferous iron-containing sulphidic material A process for recovering gold from refractory auriferous iron containing sulphidic material which comprises treating an aqueous slurry of the material in a pressure oxidation step at a temperature in the range of from about 135° to about 250° C. under a... | 09/09/1986 |
| 4606766 | Process for separately recovering gold and silver from solution by carbon adsorption A process for separately recovering gold and silver from a solution containing dissolved gold and silver by carbon adsorption which comprises passing the solution sequentially through a series of carbon adsorption stages and passing carbon sequentially th... | 08/19/1986 |
| 4606948 | Process for the production of nickel-chromium/chromium carbide coatings on substrates A process for producing a nickel-chromium/chromium carbide coating on a substrate comprises flame spraying nickel/chromium carbide composite powder onto the substrate to cause burnout of some of the carbon in the carbide during spraying with the result th... | 08/19/1986 |
| 4606763 | Process for the pressure oxidation acid leaching of non-ferrous metal and iron-containing sulphidic material A process for the pressure oxidation leaching of non-ferrous metal sulphidic material which comprises providing an autoclave assembly which has a series of successive compartments, the first compartment of which being substantially larger in size than eac... | 08/19/1986 |
| 4605439 | Recovery of gold from refractory auriferous iron-containing sulphidic material A process for the recovery of gold from refractory auriferous iron-containing sulphidic material which comprises providing an aqueous feed slurry of fresh feed material and oxidized solids from a subsequent pressure oxidation step. The feed slurry has a p... | 08/12/1986 |
| 4594102 | Recovery of cobalt and nickel from sulphidic material A process for recovering cobalt and nickel values from cobalt and nickel containing sulphidic material also containing iron includes roasting the sulphidic material to produce a calcine containing water soluble cobalt and nickel sulphate, and leaching the... | 06/10/1986 |
| 4579761 | Method of making aureate colored coins, medallions and tokens and products so made An aureate coin, coin blank, medallion, medallion blank, token or token blank has a coin-shaped core with opposed faces and a peripheral side edge and of mintable metallic material. An electroplated coating of copper and tin completely encases the core an... | 04/01/1986 |
| 4571262 | Recovery of platinum group metals from nickel-copper-iron matte A process for separately recovering platinum group metal values, nickel values and copper from nickel-copper-iron sulphidic matte containing platinum group metals includes leaching ground matte at atmospheric pressure in acidic nickel-copper sulphate solu... | 02/18/1986 |
| 4571263 | Recovery of gold from refractory auriferous iron-containing sulphidic concentrates A process for recovering gold from refractory auriferous iron-containing concentrate includes feeding the concentrate as an aqueous slurry to an acidic pretreatment step and treating the concentrate in the acidic pretreatment step with aqueous sulphuric a... | 02/18/1986 |
| 4571264 | Recovery of gold from refractory auriferous iron-containing sulphidic ore A process for recovering gold from refractory auriferous iron-containing sulphidic ore which comprises feeding ground ore as an aqueous slurry to an acidic pretreatment step. The ground ore in the acidic pretreatment step is treated with aqueous sulphuric... | 02/18/1986 |
| 4547985 | Method of protecting a metallic surface susceptible to abrasion by rock-like material This invention relates to the protection of metallic surfaces susceptible to abrasion by rock-like material. According to the invention, a metallic surface susceptible to abrasion by rock-like material is protected by stud welding studs of abrasion resist... | 10/22/1985 |
| 4545963 | Process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore A process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore which also contains iron comprises subjecting ground ore to a first flotation step to float an initial lead concentrate containing zinc and produce zinc a... | 10/08/1985 |
| 4510028 | Process for recovering zinc from zinc ferrite material A process for recovering zinc from material containing zinc ferrite includes leaching the ferrite containing material together with zinc sulphide containing material in a leach step, with the relative amounts of ferrite material and zinc sulphide material... | 04/09/1985 |
| 4505744 | Recovery of zinc from zinc containing sulphidic material A process for recovering zinc from zinc-containing sulphidic material which also contains iron and lead includes leaching the material under oxidizing conditions at a temperature in the range of from about 130° to about 155° C. in aqueous sulphuric acid... | 03/19/1985 |
| 4443253 | Recovery of zinc from zinc containing sulphidic materials A process for recovering zinc from zinc-containing sulphidic material also containing iron and from zinc oxide containing material. Zinc-containing sulphidic material is leached under oxidizing conditions at a temperature in the range of from about 130° ... | 04/17/1984 |
| 4440569 | Recovery of zinc from zinc-containing sulphidic material A process for recovering zinc from zinc containing sulphidic material which also contains iron together with lead and/or silver includes leaching the material under oxidizing conditions at a temperature in the range of from about 130° to about 170° C. i... | 04/03/1984 |
| 4423007 | Removal of radium from aqueous sulphate solutions A process for removing radium from a radium-containing aqueous sulphate solution also containing dissolved magnesium at a pH not greater than about 10 comprises treating the solution with a soluble barium salt to precipitate radium as barium radium sulpha... | 12/27/1983 |
| 4406864 | Recovery of uranium from material containing iron, arsenic and siliceous matter A process for the recovery of uranium values from uranium-containing material which also contains iron, arsenic and siliceous matter, includes leaching the uranium-containing material in aqueous sulphuric acid solution under conditions to provide dissolve... | 09/27/1983 |
| 4405570 | Removal of dissolved cadmium and copper from sulphate solution with hydrogen sulfide A process for selectively removing ions of copper and/or cadmium from a sulphate solution containing nickel and/or cobalt values. The solution is treated at a temperature in the range of from about 85° to about 95° C. and at a pH in the range of from ab... | 09/20/1983 |
| 4405566 | Removal of uranium from sulphate solutions containing molybdenum A process for recovering uranium values from a sulphate solution containing dissolved uranium and molybdenum and with a pH not exceeding about 5.5, includes reacting the solution with ammonia at a pH in the range of from about 8 to about 10, without the s... | 09/20/1983 |
| 4388109 | Process for the production of silver powder from silver chloride, sulphate or sulphide A process for the production of elemental silver from silver chloride, silver sulphate or silver sulphide includes mixing the silver salt with sodium carbonate, and heating the mixture at a temperature in the range of from about 500° C. to about 650° C.... | 06/14/1983 |
| 4379037 | Removal of manganese and chloride ions from aqueous acidic zinc sulphate solutions A process for removing manganese and chloride ions from an aqueous acidic sulphate solution containing zinc, manganese and chloride ions without removing a substantial amount of zinc ions from the solution includes adjusting the free acidity of the soluti... | 04/05/1983 |
| 4377556 | Process for removing dissolved selenium values from an acidic aqueous copper sulphate solution Dissolved selenium values are removed from an acidic aqueous copper sulphate solution by treating the solution at a temperature of at least about 140° C. with a stoichiometric excess relative to the dissolved selenium of sulphur dioxide or a sulphite sol... | 03/22/1983 |
| 4374808 | Removal of selenium from acidic copper/nickel solutions Selenium (IV) and selenium (VI) are removed from acidic copper-nickel sulphate solutions in a two-stage process by adjusting and maintaining the sulphuric acid content of the solution in a range of 10 to 50 g/L and, in a first stage, contacting the soluti... | 02/22/1983 |
| 4374173 | Composite powders sprayable to form abradable seal coatings A composite powder sprayable by thermal spraying onto a substrate to form an abradable seal coating, is composed of particles each having a core of non-metallic solid material surrounded by a layer of nickel-chromium-aluminum alloy containing from about 4... | 02/15/1983 |
| 4366128 | Removal of arsenic from aqueous solutions A process for removing arsenic from an aqueous solution containing arsenic in the form of a soluble arsenate includes adjusting the pH of the solution if necessary to at least about 10, adding a soluble barium salt to precipitate arsenic as barium arsenat... | 12/28/1982 |
| 4344574 | Cross-flow nebulizer A cross-flow nebulizer is manufactured from first and second deformable tubular members each having a substantially constant external diameter and a central passage of substantially constant diameter extending from a forward end to a rearward end. A forwa... | 08/17/1982 |
| 4331469 | Process for the recovery of silver values from silver-containing material which also contains iron and arsenic A process for the recovery of silver values from silver-containing material which also contains iron and arsenic includes leaching the material under oxidizing conditions at elevated temperature and pressure in aqueous nitric acid solution to dissolve a s... | 05/25/1982 |
| 4330508 | Removal of selenium (IV) and (VI) from acidic copper sulphate solutions A process for removing dissolved selenium IV values from an acidic aqueous copper sulphate solution includes passing the solution through a tubular member in a plug flow manner and injecting sulphur dioxide or a sulphite solution into the solution as it e... | 05/18/1982 |
| 4329320 | Method and treatment of a gaseous mixture of ammonia, carbon dioxide and water vapor A method of condensing a gaseous mixture of ammonia carbon dioxide gas and water vapor to produce an ammonium carbonate solution with minimum formation of ammonium carbamate includes passing the gaseous mixture into a condenser and cooling the condensing ... | 05/11/1982 |
| 4306902 | Process for the production of elemental silver from silver chloride or silver sulphate A process for the production of elemental silver from silver chloride or silver sulphate includes mixing the silver salt with sodium carbonate, and heating the mixture at a temperature in the range of from about 500° C. to about 650° C. to produce eleme... | 12/22/1981 |
| 4290866 | Removal of manganese ions from zinc and manganese containing solutions A process for removing manganese ions from aqueous acidic sulphate solutions containing zinc and manganese ions, without removing a substantial amount of zinc ions from solution, includes treating the solution with ozone to oxidize manganese ions to manga... | 09/22/1981 |
| 4291089 | Composite powders sprayable to form abradable seal coatings A composite powder sprayable by thermal spraying onto a substrate to form an abradable seal coating with suitable strength and erosion resistance. Each powder particle has a core of non-metallic solid material surrounded by a layer of metallic material se... | 09/22/1981 |
| 4290826 | Process for the production of cobalt-rare earth alloy powders A process for producing cobalt-rare earth alloy powders suitable for forming into permanent magnets includes mixing cobalt powder particles having refractory oxide dispersoid powder particles fixed in the surfaces of the cobalt particles with particles of... | 09/22/1981 |
