Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 6797033 | Method for recovering catalytic metals A method for recovering catalytic metals from fluids containing catalytic metal colloids. Fluid compositions such as rinse solutions or dragout baths containing catalytic metal colloids are passed through a filter that entraps catalytic metal colloids on the filter.... | 09/28/2004 |
| 6773485 | Method for recovering catalytic metals using a porous metal filter A method for recovering catalytic metals from fluid compositions containing catalytic metal colloids. Fluid compositions such as aqueous rinse solutions or dragout baths containing catalytic metal colloids are passed through a porous metal filter that entraps the ca... | 08/10/2004 |
| 6602319 | Process for the recovery of gold and silver from used refractory bricks The present invention relates to a process for the recovery of gold and silver from the used refractory bricks of Dore furnace. This invention particularly relates to a process for the recovery of gold and silver from the used refractory bricks generated ... | 08/05/2003 |
| 6555010 | Solution mining process for removing metals from aqueous solution A process is disclosed for obtaining colloid-forming metal particles from an aqueous mine waste solution containing that metal in ionic form. In accordance with this process, an aqueous mine waste solution containing that metal in ionic form is provided h... | 04/29/2003 |
| 6290747 | Conversion of impure silver halide to ultra-pure silver metal A method for preparing ultra-pure silver from a crude silver halide matrix containing metallic and/or non-metallic impurities, said method comprising; roasting the crude silver halide matrix to substantially remove carbonaceous material; treating the roas... | 09/18/2001 |
| 5769925 | Process for the elution of precious metals absorbed on active carbon A powerful reducing agent such as hydrazine monohydrate is added to the standard eluent solutions such as NsOH-NaCN with or without alcohol. The kinetics of elution of gold or of silver are thus markedly enhanced.... | 06/23/1998 |
| 5223022 | Ion-exchange agent and use thereof in extracting heavy metals from aqueous solutions A novel ion-exchange agent, an aluminum-enriched analogue to the zeolite chabazite, hereinafter "Al-Chab" is disclosed. The Al-Chab is used in processes for recovering precious metals from aqueous solutions or for removing toxic heavy metals from contamin... | 06/29/1993 |
| 5064466 | Non-toxic process for recovery of photographic silver A non-toxic process for the recovery of silver from silver containing photographic emulsion coated paper or film substrates is provided. The process includes the use of a stripping formulation comprised of an alkaline bleach solution which is capable of h... | 11/12/1991 |
| 4874429 | Hydrometallurgical process for the recovery of silver from copper electrolysis anode sludge Silver is recovered from an anode sludge by initially chlorinating the sludge in a slurry with nascent chlorine. The nascent chlorine is produced in situ by addition of sodium hypochlorite to the slurry in hydrochloric acid. Then the slurry is filtered an... | 10/17/1989 |
| 4816235 | Silver and manganese recovery using acidified thiourea A method for obtaining silver and manganese metal from a silver-manganese ore includes the step of leaching the ore with acidified thiourea. More specifically, the method includes the step of leaching the ore with an acidic thiourea solution to form a lea... | 03/28/1989 |
| 4786323 | Process for the recovery of noble metals from ore-concentrates A process for the hydrometallurgical recovery of gold and silver by direct oxidizing sulphuric acid-digestion of arsenopyrite-concentrates (FeAsS2) containing carbonaceous materials with a silicate gangue, and/or a silicate and pyrite gangue wh... | 11/22/1988 |
| 4662613 | Reusable precious metal recovery cartridge A reusable cartridge for extracting precious metal from solutions containing such metal by means of a replacement reaction is disclosed. A dispersion means distributes incoming solution uniformly through a cylindrical housing having a spiral rolled exchan... | 05/05/1987 |
| 4561887 | Process for recovering metals from solution through solvent extraction and pyrometallurgical reduction Solvent extraction is used for selective recovery of a dissolved metal such as copper from an aqueous solution of metals by means of an organic liquid, immiscible with the aqueous solution and selective for the metal of interest. The metal is extracted fr... | 12/31/1985 |
| 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 |
| 4397689 | Process for the extraction of precious metals from concentrates thereof The process comprises the steps of leaching the concentrate with hot hydrochloric acid and chlorine gas to dissolve most of the gold, platinum and palladium, treating the residue from the leaching step with an excess of an alkaline oxidizing agent to solu... | 08/09/1983 |
| 4360380 | Process for recovery of metal values from sludges A process for the recovery of selected metal values from silica containing sludges including incineration of the sludge to degrade organic components, followed by acid leaching of the ash, followed by hydrometallurgical recovery of metal values from the r... | 11/23/1982 |
| 4331472 | Metal removal apparatus and method A first metal is removed from solutions such as polluted water by contacting the solution with a metallic exchange medium. The metallic exchange medium comprises a plurality of buoyant elements, each comprising a substrate coated with a second metal suffi... | 05/25/1982 |
| 4177067 | Recovery of silver, copper and zinc from partially roasted pyrite concentrate by ferric sulphate leaching A process for treating a pyrite concentrate containing silver, copper and zinc to recover the metals contained therein is disclosed. The process includes the partial roasting of the concentrate to open the pyrite matrix to solution penetration followed by... | 12/04/1979 |
| 4164418 | Method of recovering valuable metals from zinc bearing materials and blast furnace relevant thereto The blast furnace in the present invention comprises a V-shaped or an inclined hearth, tuyeres disposed along said hearth, a tap hole for discharging matte and/or slag, said tap hole being disposed at the lowest part of the hearth, and dampers having V-sh... | 08/14/1979 |
| 3996046 | Extraction and purification of silver from sulfates A method is provided for extracting silver from a silver sulfate-bearing substance, such as oxide materials, metal or metal sulfate mixtures containing silver sulfate which comprises subjecting said substance to aqueous leaching to remove soluble salts th... | 12/07/1976 |
| 3958985 | Extraction method for non-ferrous metals Non-ferrous metals are recovered from metal bearing ores or other metal sources in substantially quantitative yields by treating a finely divided metal bearing material with an aqueous inorganic acid to form a slurry and baking the slurry at atmospheric p... | 05/25/1976 |
| 3933475 | Extraction of copper from copper sulfides Copper is recovered from its sulfidic ores by a process wherein the ore is mixed and fused with at least a stoichiometric amount of a sulfide of sodium or potassium which may be prepared in situ by reacting sulfur with potassium or sodium hydroxide. The m... | 01/20/1976 |
