| Patents for C22B 34 - Obtaining refractory metals (6,435) |
|---|
| 10/23/1990 | US4964906 Method for controlling the oxygen content of tantalum material |
| 10/17/1990 | EP0392211A1 Process for the reuse of spent sulfuric acid |
| 10/10/1990 | EP0360792A4 Process for making zero valent titanium from an alkali metal fluotitanate |
| 10/09/1990 | US4961911 Process for reducing carbon monoxide emissions from a fluidized bed titanium dioxide chlorinator |
| 10/09/1990 | US4961910 As oxides; digestion with hydrochloric acid or sulfuric acid |
| 10/09/1990 | US4961784 Blowing inert gas from bottom and side and oxygen from top to decarburize reduced ores |
| 10/09/1990 | US4961776 Cold hearth refining |
| 10/07/1990 | CA2014001A1 Method for re-using waste sulphuric acid |
| 10/03/1990 | EP0390293A1 A process of treating metal chloride wastes |
| 10/02/1990 | US4960471 Heating in hydrogen with encapsulated getter metal |
| 10/02/1990 | CA1274672A1 Process for the reduction of fluorides of silicon, titanium, zirconium or uranium |
| 09/25/1990 | CA1274375A1 Process for the preparation of ticl.sub.4 |
| 09/18/1990 | US4957562 Chrome oxide green, a process for its preparation and its use |
| 09/18/1990 | US4957544 Lining durability; corrosion resistance |
| 09/04/1990 | US4954169 Agglomerates |
| 09/04/1990 | US4954168 Reclaiming of aluminum-chromium waste materials from etching operations |
| 09/04/1990 | US4954166 Production of sponge metal from sponge metal fines |
| 08/22/1990 | EP0257373B1 Process for the preparation of titanium dioxide pigments |
| 08/14/1990 | US4948476 Using electrolytic oxidation cell and coupled transport module |
| 08/01/1990 | EP0124578B1 Chlorination of titanium ores using lignitic reactive carbons |
| 07/27/1990 | WO1990008843A1 Direct smelting process |
| 07/25/1990 | CN1044129A Catalysising. crystallizing and growing of columbite from a kind of slag |
| 07/18/1990 | EP0129555B1 Process and apparatus for obtaining silicon |
| 07/17/1990 | US4941916 Sublimation |
| 07/11/1990 | CN1043752A Process for extracting scandium from ore |
| 06/28/1990 | WO1990006898A1 Extraction and purification of titanium products from titanium bearing minerals |
| 06/19/1990 | US4935054 Through a chute to mouth of furnace |
| 06/12/1990 | US4933152 Continuous process for purifying molybdenum |
| 06/12/1990 | US4932635 Cold hearth refining apparatus |
| 06/05/1990 | US4932040 Bidirectional control signalling bus interface apparatus for transmitting signals between two bus systems |
| 06/05/1990 | EP0305502A4 Process for the production of group ivb transition metal-alkali metal-fluoride salts and purification thereof. |
| 05/30/1990 | CN1042527A Treatment for waste acid |
| 05/23/1990 | EP0368987A1 HIGH PURITY Zr AND Hf METALS AND THEIR MANUFACTURE |
| 05/22/1990 | US4927794 Aqueous, ammonia, ammonium salt, hydrogen peroxide |
| 05/22/1990 | CA1269225A1 Process for partial oxidation of fecl.sub.2 to fecl.sub.3 |
| 05/16/1990 | EP0368380A1 Process for the purification of an aqueous alcaline or ammonium metallate solution including their isopolyanions of the metals chromium, molybden or tungsten |
| 05/08/1990 | US4923577 Electrochemical-metallothermic reduction of zirconium in molten salt solutions |
| 05/08/1990 | US4923531 Deoxidation of titanium and similar metals using a deoxidant in a molten metal carrier |
| 05/08/1990 | US4923507 Process for opening ores |
| 05/03/1990 | WO1990004656A1 Refining of ilmenite by removal of excess chromite |
| 05/03/1990 | WO1990004569A1 Recovery of titanium values from minerals by fluidized-bed chlorination |
| 05/03/1990 | WO1990004043A3 Method of producing titanium |
| 05/02/1990 | EP0365680A1 A method for producing a reduced chromium-ore bearing powder. |
| 04/28/1990 | CA2001751A1 Recovery of titanium values from minerals |
| 04/24/1990 | CA2001371A1 Separation of chromite from metalliferous ores |
| 04/19/1990 | WO1990004043A2 Method of producing titanium |
| 04/18/1990 | EP0363683A1 Process for the recovery of greatly concentrated sulfuric-acid solutions by the treatment of diluted sulfate-containing sulfuric-acid concentrations |
| 04/17/1990 | US4917872 Dissolving iron-containing titanium material in solution of hydrofluoric acid, crystallizing and separating, cooling |
| 04/17/1990 | US4917726 Chromium recovery process |
| 04/04/1990 | EP0360792A1 Process for making zero valent titanium from an alkali metal fluotitanate |
| 04/03/1990 | US4913885 Aqueous suspension of spent vanadium pentaoxide catalyst contacted with oxygen and sulfur dioxide |
| 04/03/1990 | US4913884 Uranium-preextraction in zirconium/hafnium separations process |
| 03/22/1990 | WO1990002823A1 IMPROVED PROCESS FOR OBTAINING IMPURITY-FREE COMPOUNDS OF Ta AND/OR Nb FROM MATERIALS CONTAINING THESE METALS |
| 03/20/1990 | US4910000 Method of extracting tungsten values from tungsten containing ores |
| 02/20/1990 | US4902485 Process for the production of titanium dioxide pigments |
| 02/08/1990 | WO1990001073A1 Sintered high titanium agglomerates |
| 02/08/1990 | WO1990001072A1 Titanium agglomerates |
| 01/30/1990 | US4897116 High purity Zr and Hf metals and their manufacture |
| 01/25/1990 | WO1990000627A1 Cold hearth refining apparatus and method |
| 01/16/1990 | US4893790 Apparatus for producing metal zirconium by the reduction of zirconium tetrachloride |
| 01/10/1990 | CN1038671A Method for production of metals or ferroalloys by direct reduction and column for treating particulate materials with gas |
| 01/02/1990 | US4891130 Process for removing metals from aluminosilicate materials |
| 01/02/1990 | US4891066 Highly pure titanium |
| 12/27/1989 | EP0347668A2 Fine-grained, high-purity earth acid metal powders, process for their production and their use |
| 12/27/1989 | CN1038232A Super-fine molybdenum-powder process technique |
| 12/14/1989 | DE3916676A1 Method and installation for processing scrap |
| 12/13/1989 | CN1037929A Process for producing titanium,zirconium,chromium,samarium and neodymium metals from their oxides |
| 11/30/1989 | WO1989011449A1 HIGH PURITY Zr AND Hf METALS AND THEIR MANUFACTURE |
| 11/29/1989 | EP0343378A1 Process for producing metallic titanium, zirconium, chromium, samarium or neodymium from their oxides |
| 11/28/1989 | US4883601 Process for purifying an aqueous, hydrogen sulfide-scrubbing solution |
| 11/14/1989 | EP0289537A4 Process for the production of zirconium sulphate. |
| 10/31/1989 | US4877449 Vertical shaft melting furnace and method of melting |
| 10/31/1989 | US4877445 Reduction using reducing metal agent |
| 10/24/1989 | US4875985 Method and appparatus for producing titanium |
| 10/18/1989 | CN1036466A Bidifectional control signalling bus interface apparatus for transmitting signals between two bus system |
| 10/17/1989 | US4874475 Using alkali(earth) chlorides as solvent |
| 10/11/1989 | CN1036228A Process for reduction of titanite ore powder and uses thereof |
| 10/03/1989 | CA1262031A1 Production of elements and compounds by deserpentinization of ultramafic rock |
| 09/27/1989 | CN1035852A Production of high-voltage high-specific capacitance tantalum powder by means of carbon reduction |
| 09/26/1989 | CA1261297A1 Electrolytic recovery process and system for obtaining titanium metal from its ore |
| 09/21/1989 | WO1989008724A1 Reduced chromium-ore bearing powder and method for producing the same |
| 09/12/1989 | US4865696 Recovery of metal chlorides from their complexes by molten salt displacement |
| 09/12/1989 | US4865695 Preparation of complexes of zirconium and hafnium tetrachlorides with phosphorus oxychloride |
| 09/12/1989 | US4865694 Distillation |
| 09/12/1989 | US4865693 Preparation of complexes of zirconium and hafnium tetrachlorides with phosphorus oxychloride |
| 09/05/1989 | US4863711 Digestion with hydrogen chloride and alkali metal compound a titanium bearing material |
| 09/05/1989 | US4862816 Computer operated sewing machine with a mode switching function |
| 08/29/1989 | US4861565 Method of separately recovering metal values of petroleum refining catalyst |
| 08/23/1989 | EP0328677A1 PROCESS FOR MELT REDUCTION OF Cr STARTING MATERIAL AND MELT REDUCTION FURNACE |
| 08/22/1989 | US4859236 Process for producing molybdenum-ruthenium metal powder |
| 08/09/1989 | EP0272294A4 Preparation of hydrolysed zirconium salt precursors and high purity zirconia. |
| 08/08/1989 | US4854972 Nitrogen-free process for chloride-route TiO2 pigment manufacture |
| 08/08/1989 | CA1258220A1 METHOD FOR THE DISPERSION OF HARD .alpha. DEFECTS IN INGOTS OF TITANIUM FOR TITANIUM ALLOY AND INGOTS PRODUCED THEREBY |
| 07/26/1989 | EP0324871A1 Process for preparing pigmentary titanium dioxide |
| 07/25/1989 | US4851199 Converting dissolved vanadium to insoluble vanadate by oxidation |
| 07/18/1989 | US4849189 Vandium recovery process |
| 07/18/1989 | US4849016 Combined ultra slow electron beam and vacuum arc melting for barrier tube shell material |
| 07/18/1989 | US4849013 Combined electron beam and vacuum arc melting for barrier tube shell material |
| 06/28/1989 | CN1004637B Porcess for producing low-oxygen chromium powder |
| 06/21/1989 | EP0320730A2 Process for making zirconium for use in liners of reactor fuel elements |