Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 7846234 | Method of precious metal recovery The proposed invention relates to methods of precious metal recovery and may be applied to the recovery of precious metals from various types of mineral raw source materials containing chlorides of alkali and earth metals, e.g. collective concentrate produced from c... | 12/07/2010 |
| 7086405 | Screenings washer A screenings washer having a hopper, a grinder downstream of the hopper, and a washer downstream of the grinder. The washer includes an auger rotor that receives the screenings ground by the grinder, a spray wash system that sprays a wash fluid directly onto a porti... | 08/08/2006 |
| 7066981 | Assaying method The invention provides a method of assaying a mineral sample for determining the concentration of selected metals in a sample comprising the steps of providing a comminuted mineral sample; mixing such sample with a flux; preheating a reaction vessel to a temperature... | 06/27/2006 |
| 7066983 | Method for thiosulfate leaching of precious metal-containing materials Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polyth... | 06/27/2006 |
| 7025936 | Method and apparatus for preparing a sample for analysis of precious metal content This invention relates to a method for assaying an ore sample to determine the concentration of gold and PGMs therein. The method comprises the steps of separating an ore sample, combining the prepared ore sample with a lead-containing flux, inductively heating the ... | 04/11/2006 |
| 6626978 | Method for dressing materials A material benefication process and device for dressing a material comprising noble metals including platinum group metals. The device includes a reactor vessel with an inlet and an outlet for the processing medium. The material to be processed and a hold... | 09/30/2003 |
| 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 |
| 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 |
| 5536294 | Process for extracting precious metals from volcanic ore A process for extracting precious metal from volcanic ore includes the steps of crushing the ore, heating the ore in a hydrogen atmosphere to soften oxide mineral encapsulating the precious metal, cooling the ore, grinding the ore, and processing the ore ... | 07/16/1996 |
| 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 |
| 5439503 | Process for treatment of volcanic igneous rocks to recover gold, silver and platinum The recovery of gold, silver and platinum group metals from volcanic cinders containing iron is achieved by mixing the cinders with a suitable flux, and metallic copper, and smelting the mixture at a sufficiently high temperature to produce a molten mass ... | 08/08/1995 |
| 5364444 | Metal leaching and recovery process A process for extracting metals from a flotation concentrate containing gold, platinum group minerals, copper, nickel and sulfur. The process involves roasting the concentrate in the presence of oxygen to reduce the sulfur content of the concentrate to ap... | 11/15/1994 |
| 5238485 | Method for the assay and recovery of precious metals Complex ores of the precious metals which also contain iron spinels and similar compounds are assayed and their precious metals content is extracted by subjecting the ores or concentrates thereof together with an iron-embrittling agent to a pyrometallurgi... | 08/24/1993 |
| 5084092 | Method of separating metals from catalyst material A method of separating metals from carbon-supported catalyst materials comprises the steps of combusting the carbon at a temperature insufficient to cause volatisation of the metal followed by reduction with hydrogen of any oxidised metal and washing with... | 01/28/1992 |
| 4579589 | Process for the recovery of precious metals from a roaster calcine leach residue A process for separating precious metals from a roaster calcine leach residue from a process wherein copper or zinc sulfides are roasted to produce a copper or zinc calcine; the calcine is leached with an aqueous sulfuric acid leaching solution to produce... | 04/01/1986 |
| 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 |
| 4337226 | Recovery of platinum-group metals from ores Metal values are recovered from ore concentrates by means of dry grinding, followed by a two-stage leaching process in which the ground concentrate is first leached with sulfuric acid at a temperature of about 90° to 100° C. to selectively leach nickel ... | 06/29/1982 |
| 4135918 | Roast-reductive leach process for copper recovery A sulfide containing copper and one or more of iron, nickel and cobalt, is dead-roasted at a temperature of 750° C or above, then subjected to a pressure leach under reducing conditions to produce elemental copper and an aqueous solution of the other met... | 01/23/1979 |
| 4086084 | Refining of metals This invention relates to refining platinum group metal concentrates and the separation therefrom of silver and of the majority of base metals with which they naturally occur. In more detail the process comprises the steps of: (a) contacting a solid parti... | 04/25/1978 |
| 4077800 | Method for the recovery of platinum from spent catalysts An economical procedure for the recovery of platinum from a spent catalyst involves subjecting the catalyst to fluorination with elementary fluorine or a mixture thereof with hydrogen fluoride at a temperature ranging from 100°-600° C. The resultant pla... | 03/07/1978 |
| 4033763 | Process for recovery of selected metal values from waste waters A process for economically recovering metal values, especially precious metal values, from waste waters comprising a mixture of natural surface water, industrial waste water and organic waste, where the metal values appear in concentrations below levels p... | 07/05/1977 |
| 4002470 | Process for recovering ruthenium From a ruthenium-containing substance, sparingly soluble in any of water, acid solutions and basic solutions, flaked off used metal electrodes comprising a substrate of a corrosion-resistant metal coated with ruthenium metal or a compound thereof, rutheni... | 01/11/1977 |
| 3979207 | Refining of noble group metals This invention relates to the separation and purification of platinum group metals and, in particular to the separation of mixtures of rhodium, platinum and irridium. According to one specific form of the invention, the platinum, rhodium and iridium are p... | 09/07/1976 |
| 3960549 | Process for the separation and purification of platinum, rhodium and iridium This invention relates to a process for the separation and purification of platinum group metals and particularly platinum, rhodium and iridium. Essentially the platinum group metals are present as salts dissolved in an aqueous solution and the process fo... | 06/01/1976 |
