Famous Patents
In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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 |
| 7514051 | Process for making high purity sodium sulfate A method for purifying heavy metal impurities (such as antimony, arsenic, iron, cadmium, and lead) from 28 to 38 weight percent aqueous crude sodium sulfate solution is achieved by adding ferric sulfate to the aqueous crude sodium sulfate solution to form a suspensi... | 04/07/2009 |
| 7323150 | Methods for recovering at least one metallic element from ore A method for recovering at least one metallic element from ore or other material is described and includes reacting ore or other material with a salt capable of recovering the metallic element from the ore or other material to form a reaction product that includes t... | 01/29/2008 |
| 7041268 | Process for recovery of sulphate of potash The present invention is directed to a novel integrated process for the recovery of sulphate of potash (SOP) from sulphate rich bittern. The process requires bittern and lime as raw materials. Kainite type mixed salt is obtained by fractional crystallization of the ... | 05/09/2006 |
| 6652603 | Process for removing sodium sulfate from nickel hydroxide effluent streams A method for removing sodium sulfate from nickel and ammonia containing aqueous effluents. The effluents, typically from a nickel hydroxide production process, are cooled to or below 30° C. to crystallize and precipitate the sodium sulfate and dewater th... | 11/25/2003 |
| 6419887 | Process for the treatment of residual liquors from the ammoniation and carbonation of alkali metal salts A process for the treatment of residual liquors from the ammoniation and carbonation of alkali metal salts containing ammonium salts, sodium salts, soluble sodium bicarbonate, ammonium bicarbonate and water and producing purified ammonium salts, comprisin... | 07/16/2002 |
| 6180074 | Method for processing flue gases containing sulphur oxides A method for removing contaminants, such as sulfur dioxide, mercury and hydrochloric acid, out of flue gases is provided, said method including the steps of: treating the flue gases with a reagent, such as sodium carbonate, sodium bicarbonate and ammonium... | 01/30/2001 |
| 6177056 | Process for recycling lead-acid batteries A process for recovery of substantially all the sulfur in a spent lead-acid battery as Na2 SO4 is disclosed. The process comprises (a) breaking the batteries to remove the acid, (b) separating the plastic from the lead bearing materi... | 01/23/2001 |
| 6143271 | Process for producing potassium sulfate from potash and sodium sulfate The present invention provides a process for producing potassium sulfate from a potash and a sodium sulfate source, comprising the steps of: (a) treating a portion of the potash source and sodium sulfate source, such that glaserite is crystallized out of ... | 11/07/2000 |
| 6056813 | Process and system for producing pigments directly from component raw materials without byproducts A process for making white pigment directly from constituent materials without byproducts. The process comprises the steps of inputting three material flows comprising a sulphate source, an alkali source, and an aluminum source. And, recycling and mixing ... | 05/02/2000 |
| 6053963 | Method for treating rotary slag The present invention provides a method for treating rotary slag containing iron and sodium compounds. The method involves treating the slag in a sulfuric acid solution to convert the iron and sodium within the slag to iron sulfate and sodium sulfate. The... | 04/25/2000 |
| 5895523 | Process for making basic alkali metal sulfate pigments A process is provided for making K2 SO4 3Al2 O3 4S03 +xH2 O or Na2 SO4 3Al2 O3 4SO3 +xH2 O where x is a number from 4 to 12, whi... | 04/20/1999 |
| 5665324 | Recovery of valuable substances Valuable substances are recovered from a spent electroless nickel plating solution containing a water-soluble nickel salt, organic complexing agent, hypophosphite, phosphite, and alkali metal ion by adding oxalic acid to the plating solution for causing a... | 09/09/1997 |
| 5624649 | Process for reduction of sulfur dioxide emission from combustion gases combined with production of potassium sulfate A wet flue gas desulfurization process and system are provided for removing sulfur dioxide from flue gases produced by processing operations of the type carried out in utility and industrial plants. In particular, the desulfurization process utilizes an a... | 04/29/1997 |
| 5552126 | Co-production of potassium sulfate, sodium sulfate and sodium chloride A process for producing potassium sulfate, sodium sulfate, and sodium chloride from potash and a sodium sulfate/water source, which includes: (a) treating the sodium sulfate/water source to produce a slurry containing anhydrous sodium sulfate; (b) concent... | 09/03/1996 |
| 5549876 | Production of potassium sulfate using differential contacting A process for the manufacture of potassium sulfate from a sodium sulfate source, potash and water, comprising the steps of: (a) introducing the sodium sulfate source, water and potash into a differential countercurrent contactor; and (b) causing the sodiu... | 08/27/1996 |
| 5529764 | Co-production of potassium sulfate and sodium sulfate A process for producing potassium sulfate or potassium sulfate and sodium sulfate from potash and a sodium sulfate/water source, which includes: (a) subjecting a sodium sulfate source to conversion with potash in an aqueous medium to yield glaserite preci... | 06/25/1996 |
| 5221528 | Process for the preparation of sodium chloride In a purification process for brine, impurities such as calcium, magnesium and/or sulphate are precipitated by the addition of calcium hydroxide (Ca(OH)2) and sodium carbonate (Na2 CO3). Following NaCl crystallization by e... | 06/22/1993 |
| 4804498 | Process for treating radioactive waste liquid A soluble salt (sodium sulfate or sodium borate (Na2 SO4 or Na2 B4 O7) contained as the main component in a concentrated radioactive waste liquid generated in the BWR power plant or the PWR power plan... | 02/14/1989 |
| 4749453 | Method and apparatus for making hydrochloric acid and sodium hydroxide By combining the manufacture of sodium hydroxide and hydrochloric acid, and by using a fuel cell to optimize the energy consumption, the energy efficiency of the manufacture of NaOH and HCl can be improved by at least about 33%. Electrical energy produced... | 06/07/1988 |
| 4636376 | Sulfate removal from alkali metal chlorate solutions A process for the removal of essentially chromium-free sulfate from a chromate and sulfate-containing chlorate liquor which includes mixing the chlorate liquor having a pH of between about 2.0 and 6.0 with a calcium-containing material at a temperature an... | 01/13/1987 |
| 4610722 | Process for metal recovery from steel plant dust A process is provided for hydrometallurgical processing of steel plant dusts containing cadmium, lead, zinc, and iron values, along with impurities such as chloride and fluoride salts of sodium, potassium, magnesium, etc. The first step in the process inv... | 09/09/1986 |
| 4554151 | Process for producing K3 H(SO4)2 crystals and potassium sulfate crystals A process for producing K2 SO4 from potassium chloride salts, calcium sulfate salts and another sulfate source wherein syngenite is formed and then decomposed with mineral acid to produce crystalline K3 H(SO4) | 11/19/1985 |
| 4533536 | Process for the manufacture of potassium sulphate by treating solutions containing magnesium chloride and potassium chloride Process for the manufacture of potassium sulphate from solutions containing magnesium chloride and potassium chloride from solutions, more particularly from mother liquors issuing from the treatment of carnallite. According to this process sodium sulphate... | 08/06/1985 |
| 4466950 | Process for recovering cesium from cesium alum Cesium is recovered from cesium alum, CsAl(SO4)2, by a two-reaction sequence in which the cesium alum is first dissolved in an aqueous hydroxide solution to form cesium alum hydroxide, CsAl(OH)3, and potassium sulfate, K | 08/21/1984 |
| 4451439 | Process for the purification of solutions containing a sodium or potassium carbonate, sulphate, and possibly hydroxide, and at least one of the metals vanadium, uranium and molybdenum A process for the purification of solutions containing sodium or potassium carbonate, sulphate, hydroxide or hydrogen carbonate, and mainly at least one of the metals belonging to the group formed by vanadium, uranium or molybdenum, in the form of sodium ... | 05/29/1984 |
| 4265863 | Integrated process for treatment of residual solutions from anodization plants A process and installation for the integrated treatment of concentrated residual solutions resulting from the anodization of aluminium parts is described, in which caustic soda is employed in the pickling process and sulphuric acid in the anodization bath... | 05/05/1981 |
| 4230678 | Process for recovering aluminum from alunite An improvement in processes for recovering aluminum from alunite ore which processes include roasting the ore to remove water of hydration, removing sulfur and potassium compounds from the roasted ore by a procedure including a first leaching step resulti... | 10/28/1980 |
| 4195070 | Preparation of a MgCl2 solution for Nalco's MgCl2 process from MgSO4 and other MgSO4 salts A method of beneficiating a mixed salt mineral ore containing potassium and magnesium sulfates and/or their hydrates which allows the recovery of anhydrous magnesium chloride and the simultaneous recovery of commercially acceptable potassium sulfate.... | 03/25/1980 |
| 4180547 | Process for recovery of chemicals from saline water A continuous process for the recovery of chemicals in saline water including the steps of converting the sulfates in the saline water feed to sodium sulfate; separating and recovering in the oxide forms essentially all of the magnesium and calcium from th... | 12/25/1979 |
| 4132759 | Method of purifying brine used in electrolysis by the amalgam process In the process for the production of chlorine and alkali metal hydroxide by electrolysis according to the amalgam process using calcium- and/or sulphate containing crude salt, the calcium and/or sulphate contents introduced into the brine circuit by the c... | 01/02/1979 |
| 4129642 | Process for the production of potassium sulfate Potassium sulfate is produced from a mixture of carnallite, potassium chloride, kieserite and residual quantities of less than 15% by weight of rock salt by treating the mixture at a temperature of 20°-40° C with potash magnesia liquor to form a slurry ... | 12/12/1978 |
| 4119698 | Reclamation treatment of red mud The red mud by-product of the Bayer process by which aluminum oxide is reed from bauxite as an aluminate, is digested with concentrated sulfuric acid or with sulfur trioxide gas to produce sulfates that can be leached out to the resulting mass with water... | 10/10/1978 |
| 4119528 | Hydroconversion of residua with potassium sulfide A process for the simultaneous desulfurization and hydroconversion of heavy carbonaceous feeds, including various sulfur-containing heavy petroleum oils, is disclosed. These feedstocks are contacted with potassium sulfide in a conversion zone maintained a... | 10/10/1978 |
| 4117077 | Process for alunite treatment A process for alunite ore treatment which comprises roasting alunite in the presence of oxygen at a temperature of from 580° to 620° C. for 1 to 3 hours, decomposing the roasted alunite by exposure to reducing agents at a temperature of from 580° to 62... | 09/26/1978 |
| 4104365 | Method of separating sulfuric acid from neutral sodium sulfate in spent chlorine dioxide generator liquor A method of separating sulfuric acid from spent chlorine dioxide generator liquor. The method comprises simultaneously adding to the spent liquor, a water-soluble organic compound selected from the group consisting of alcohols and ketones, and water. The ... | 08/01/1978 |
| 4083931 | Process for treating aldol-condensation polyol waste liquor A process for treating and recovering components from aldol-condensation polyol waste liquor containing sodium formate, water, polyol, and organic by-products comprising A. vacuum crystallizing and removing sodium formate; B. introducing methanol and sulf... | 04/11/1978 |
| 4064217 | Process for recovering aluminum from alunite ore An improvement in the process for recovering aluminum from alunite ore disclosed in U.S. Pat. Nos. 3,890,425 and 3,890,426, the improvement being in the recovery of potassium sulfate by crystallization from the leaching solution resulting from potassium h... | 12/20/1977 |
| 4042675 | Process for treating the mother liquor by pH adjusting in the production of anhydrous sodium dithionite In the production of anhydrous sodium dithionite by reacting sodium formate, an alkaline sodium compound and sulfurous acid anhydride in hydrous methanol, a process for treating the mother liquor, which comprises adding an alkali to the mother liquor left... | 08/16/1977 |
| 4042674 | Process for treating the mother liquor by cooling in the production of anhydrous sodium dithionite In the production of anhydrous sodium dithionite by reacting sodium formate, an alkaline sodium compound and sulfurous acid anhydride in hydrous methanol, a process for treating the mother liquor, which comprises cooling the mother liquor left after the s... | 08/16/1977 |
| 3996334 | Process for recovering aluminum from alunite An improvement in processes for recovering aluminum from alunite ore which processes include roasting the ore to remove water of hydration, removing sulfur and potassium compounds from the roasted ore by a procedure including a final leaching step resulti... | 12/07/1976 |
