Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 7351343 | Copper metal recovery system The present invention generally relates to a copper metal recovery system, able to integrate with a waste treatment system of a circuit board manufacture plant, includes a stirring unit, a crystallization unit and a pressure filtering unit. More than 2 parts of weig... | 04/01/2008 |
| 7314604 | Stable ferric arsenate precipitation from acid copper solutions whilst minimising copper losses A method of which includes the steps of introducing an acidic solution containing (V), copper, ferric iron and ferrous iron into a first tank of a series of continuously stirred tank reactors and, in the first tank, adding air to the solution; heating the solution t... | 01/01/2008 |
| 7226573 | Fine-grain silver oxide powder A silver oxide powder that replaces silver powder as a silver conductive paste filler has a specific surface area measured by the BET method is 1.0–25.0 m2/g, average primary particle diameter is 1–50 nm, and average secondary particle diameter is 1â€... | 06/05/2007 |
| 7037482 | Solvent extraction of a halide from a aqueous sulphate solution A method of extracting a halide and sulphate from an aqueous sulphate solution, such as a zinc sulphate solution, comprises subjecting the solution to solvent extraction to extract halide and sulphate from the solution and controlling the amount of sulphate extracte... | 05/02/2006 |
| 7018605 | Sulfidation reaction control method A method of sulfidation removal of zinc using hydrogen sulfide is provided, desirably at a temperature at 60° C. or lower, wherein in a container that is pressurized at 0.1 MPa or less with respect to atmospheric pressure, by making the pH of the solution 1.5 to 4.... | 03/28/2006 |
| 6649131 | Preparation of highly pure copper oxide from waste etchant A method for recycling copper oxide includes: a first step in which a sodium hydroxide aqueous solution is added to acidic copper chloride waste etchant produced in the PCB industry, to obtain copper hydroxide slurry; and a second step in which the slurry... | 11/18/2003 |
| 6596246 | Process for producing stable cupric hydroxide and basic cupric salts Stable copper hydroxide is prepared by removing ferrous ion from the beginning cupric solution. The ferrous ion is oxidized to ferric ion, and the ferric ion is precipitated by raising the pH of the solution to 3-4. The utilization of phosphate ion both i... | 07/22/2003 |
| 6485629 | Process for separation of heavy metals from residues by use of ethylene-diamine-disuccinic acid (edds) complexant A process for separating a first source of a heavy metal ion or mixtures of heavy metal ions, (Me1), from a solution comprising a complex of said Me1 and EDDS, (Me1 -EDDS), by displacement of said Me1 with a sec... | 11/26/2002 |
| 6485696 | Recovery/removal of metallic elements from waste water using ozone Ozone is used to rapidly oxidize specific metallic elements. The insoluble oxidized compounds of the metals formed by the ozonation are then recovered for industrial use in a conventional sedimentation/filtration tank or pool. There is no requirement for ... | 11/26/2002 |
| 6454828 | Method of producing zinc diammine chloride and uses for same A method for producing zinc diammine chloride (ZDC) from a solution of zinc ammine sulfate and zinc ammine chloride by precipitating the ZDC by pH neutralization using hydrochloric acid. ZDC can be granulated for dry applications using melt granulation at... | 09/24/2002 |
| 6440194 | Recovery of precious metals from metal alloys produced aluminothermically from base metal smelter slag A method of recovering precious metals from metal alloys produced aluminothermically from base metal smelter slag, includes treating the metal alloy with aqueous sulphuric acid solution having a pH of not greater than about 2 to cause dissolution of nicke... | 08/27/2002 |
| 6342189 | Method for total precipitation of valuable metals from an acid leaching solution A method for the total precipitation of valuable metals, such as copper, nickel, zinc, cobalt, etc., from a leaching solution that has been acidified with sulphuric acid and that is substantially free from impurities, by neutralizing the solution with lim... | 01/29/2002 |
| 5980856 | Synthetic chalcoalumite-type compounds and processes for producing the same This invention relates to synthetic chalcoalumite-type compounds represented by formula (1) below: M2+a-x/2 Lix1+ Al43+ (OH)b (An-)c.mH.sub.2 O ... | 11/09/1999 |
| 5961939 | Process for recovery of silver from hardening photoprocessing solutions There is provided a method for removing silver from photoprocessing solutions containing hardening agents which comprises: a) adding a chelating agent to the photoprocessing solution in an amount sufficient to inhibit the precipitation of the high valent catio... | 10/05/1999 |
| 5741347 | Method for producing copper powder A method for stably producing a copper powder having a low degree of oxidation comprises generating copper hydroxide by adding an alkali to an aqueous solution containing copper ions, and reducing the copper hydroxide to obtain copper powder as a precipit... | 04/21/1998 |
| 5524780 | Control of regeneration of ammoniacal copper etchant A method of improved control of recycle of ammoniacal copper etchant which uses metallic aluminum to remove copper without substantially adding undesirable byproducts. The very rapid reaction can be controlled by using a diluent of copper-free etchant, el... | 06/11/1996 |
| 5443619 | Process for extracting metals from solution A process for extracting iron, copper, and nickel from a solution containing iron, copper, nickel, and at least one contaminent selected from the group comprising magnesium, aluminum, calcium and sodium, wherein each of said solutes is present at its resp... | 08/22/1995 |
| 5320759 | Selective recovery of heavy metals using xanthates A process for selectively recovering dissolved heavy metals from a solution is disclosed that involves selectively reacting a xanthate with such dissolved heavy metals. Selective reaction of a xanthate with selected dissolved heavy metals is accomplished ... | 06/14/1994 |
| 5308501 | Treatment system for alkaline or acidic solution containing heavy metals There is disclosed a method of treating a solution, e.g., an alkaline or acidic solution, containing heavy metals ions therein. With respect to alkaline solutions, the method includes providing a body of the solution; contacting the body with a material s... | 05/03/1994 |
| 5262063 | Multiple-stage precipitation process for heavy metals in aqueous solution In the process of removing heavy metals from aqueous solutions by precipitation of a salt thereof at increased pH, multiple stage precipitation by upward stepwise pH adjustment and solid separation at each stage is used to facilitate the manufacture of a ... | 11/16/1993 |
| 5248441 | Process for the recovery of copper from copper-containing industrial waste waters Process for the recovery of copper from copper-containing industrial waste waters, in which the ionogenic copper or the copper in complex form is firstly reduced with sugar, then with dithionite, and is separated in metallic form.... | 09/28/1993 |
| 5178842 | Method for precipitating and separating metals According to the method of the invention, at least one or several of the metals nickel, cobalt and copper can be selectively precipitated as sulphide by aid of elemental sulphur from aqueous solutions containing other metals such as zinc. The temperature ... | 01/12/1993 |
| 5173276 | Method for recovery of copper from copper-containing materials A process for precipitating solid hydrates of cupric tetrammine sulfate from a solution, wherein the solution contains at least 40 grams per liter of free ammonia, at least 50 grams per liter of ammonium sulfate and wherein the temperature of the solution... | 12/22/1992 |
| 5098578 | Treatment of geothermal brine A method of precipitating metals from a spent geothermal brine containing the same comprises admixing the geothermal brine with a condensate of steam, derived from the brine, in a volume ratio of brine to condensate of 1:2 to 1:10. The invention is partic... | 03/24/1992 |
| 5059403 | Method for producing copper sulfate from waste copper-containing liquid A method for producing copper sulfate from waste copper-containing liquid including the steps of recovery of acidic and basic copper-containing liquid, and neutralization of the liquid to form crystalline copper sulfate, wherein the ratio of acidic to bas... | 10/22/1991 |
| 5009793 | Process for the separation of heavy metals from waste materials A process for the heavy-metal decontamination of contaminated substances such as natural and industrial sludges, thermal residues and soils. The contaminated starting substance is treated with an acid and the dissolved metal salts are precipitated as meta... | 04/23/1991 |
| 5002748 | Method for the preparation of copper arsenate Copper arsenate, substantially free from impurities that form sludge in wood preservatives such as chromated copper arsenate, is prepared by adding a solution of soluble arsenate to copper sulfate solution, either or both solutions containing sludge-formi... | 03/26/1991 |
| 4971775 | Process for removal of nickel from effluent containing EDTA A method for removing iron(III), copper(II), zinc(I) and nickel(II) from an effluent containing chelant (EDTA, DEPA, HOEDTA) comprising treating the effluent with a soluble calcium compound (e.g., Ca(OH)2) CaCl2, Ca(NO3) | 11/20/1990 |
| 4959203 | Preparation of copper arsenate Copper arsenate, substantially free from impurities that will form a sludge in the process for producing wood preservatives such as chromated copper aresenate and having a water content of less than 15%, is prepared by mixing a solution of soluble arsenat... | 09/25/1990 |
| 4954265 | Method of processing spent electroless bath and bath for use therein A method of processing an aqueous feed liquid to precipitate at least one metal (e.g., copper, nickel or a combination thereof) in a form to make the metal subsequently removable from the feed liquid by filtration, comprises the initial step of mixing (i)... | 09/04/1990 |
| 4943377 | Method for removing dissolved heavy metals from waste oils, industrial wastewaters, or any polar solvent Precipitation (conversion) of dissolved heavy metals in waste effluents is achieved with the addition and mixing of a solution of sodium polythiocarbonate with a solution containing dissolved heavy metals. The solution of sodium polythiocarbonate has been... | 07/24/1990 |
| 4913730 | Recovery of gold from aqueous solutions Gold is recovered from aqueous solutions which include a solubilizing reagent by contacting the solution with hydrogen under selected conditions until the gold precipitates, and removing the precipitate from the solution. The reagent comprises a thiourea ... | 04/03/1990 |
| 4904459 | Process for working up dusts which are produced in the electrothermal production of phosphorus A process is provided for working up dusts which have been precipitated electrostatically from the gas mixture composed essentially of carbon monoxide and phosphorus vapor produced in the electrothermal production of yellow phosphorus, which process compr... | 02/27/1990 |
| 4859293 | Process for refining gold and apparatus employed therefor Disclosed are processes and an apparatus for refining gold. One of the processes comprises dissolving unrefined gold by use of iodine and/or an iodide compound to form a solution containing an iodide compound of gold, removing insoluble substances in the ... | 08/22/1989 |
| 4828809 | Separation of nickel from copper in autoclave Nickel is separated from copper contained in predominantly nickel- and copper-bearing sulphidic matte and alloys by chlorine leaching in an autoclave at over-atmospheric pressure. The leaching is conducted in an acidic solution at a redox potential range ... | 05/09/1989 |
| 4808406 | Preparation of cupric hydroxide compositions A method for producing finely divided stable cupric hydroxide composition of low bulk density comprising contacting solutions of an alkali metal carbonate or bicarbonate and a copper salt, precipitating a basic copper carbonate--basic copper sulfate to a ... | 02/28/1989 |
| 4778519 | Recovery of precious metals from a thiourea leach A method is provided for recovering gold and silver from precious metal bearing materials including ores, leaching residues, flue dust, electronic scrap, jewelry scrap, etc. In the method, the gold and silver are extracted from the precious metal bearing ... | 10/18/1988 |
| 4681628 | Gold Recovery processes The invention relates to a process for the recovery of gold from an alkaline aqueous liquid solution containing gold-cyanide ion, and possibly silver and/or copper and/or mercury, which comprises adding a quantity of thiourea to the solution so as to allo... | 07/21/1987 |
| 4511540 | Exploitation of copper, nickel and cobalt by treating manganiferous matrix oxidized ores Process for treating oxidized ores with a manganiferous matrix to recover the small quantities of copper, nickel and cobalt, which consists of attacking the aforementioned ore by means of an aqueous solution of H2 SO4 with the simult... | 04/16/1985 |
| 4509616 | Acoustical liners An annular groove formed on the inner surface of the porous sheet of an acoustical aircraft or jet engine liner spaced from the front edge and adjacent to the adhesive bonding material serves to prevent dislodgement of the entire porous sheet upon an impe... | 04/09/1985 |
