| Patents for C22B 34 - Obtaining refractory metals (6,435) |
|---|
| 12/10/1991 | US5071472 Induction slag reduction process for purifying metals |
| 11/28/1991 | WO1991018121A1 Method of producing high surface area low metal impurity tantalum powder |
| 11/28/1991 | WO1991017956A1 Production of acid soluble titania |
| 11/26/1991 | US5068093 Method for producing titanium dioxide |
| 11/25/1991 | CA2017577A1 Handling and disposal of toxic chromium dust |
| 11/21/1991 | EP0457120A1 Process for preparing titanium dioxide |
| 11/19/1991 | US5066469 Leaching cobalt from metal-containing particles |
| 11/14/1991 | WO1991017118A1 A process and plant for the preparation of alkaline chromates from chromium minerals |
| 11/13/1991 | EP0220198B1 Preparing metal compounds by pyrolysis |
| 11/12/1991 | US5064632 Supplying reactive carbon |
| 11/05/1991 | US5063032 Chlorine, hydrochloric acid |
| 11/05/1991 | US5062887 Process for chloride removal from sponge metal |
| 10/29/1991 | US5060914 Method for control of process conditions in a continuous alloy production process |
| 10/29/1991 | CA1291582C Disposal of material containing vanadium as landfill |
| 10/23/1991 | CN1014434B Method for the dispersion of hard alpha defects in ingots of titanium or titanium alloy and ingots produced thereby |
| 10/15/1991 | CA1290575C Leaching cobalt, molybdenum, nickel, and vanadium from spent hydroprocessing catalysts |
| 10/09/1991 | EP0450307A1 Hydrous trivalent chromium oxide/carbon particles |
| 10/09/1991 | EP0449892A1 Extraction and purification of titanium products from titanium bearing minerals. |
| 10/03/1991 | WO1991014793A1 Process for removing inorganic gels and incompressible solids from acidic media |
| 09/25/1991 | EP0240507B1 Chlorination of ores containing alkali or alkaline earth values |
| 09/24/1991 | CA1289364C Method for melting and reducing chrome ore |
| 09/17/1991 | US5049363 Recovery of scandium, yttrium and lanthanides from titanium ore |
| 09/05/1991 | WO1991013180A1 Production of synthetic rutile |
| 09/03/1991 | CA1288211C Process for recycling sulphuric acid containing metal sulphate |
| 09/02/1991 | WO1991013179A1 Process for recovering valuable metals from spent catalysts |
| 08/23/1991 | WO1991013182A1 Deoxidation of a refractory metal |
| 08/23/1991 | CA2075922A1 Deoxidation of a refractory metal |
| 08/22/1991 | WO1991012080A1 Processing of mineral deposits |
| 08/21/1991 | EP0442752A1 Highly purified metal material and sputtering target using the same |
| 08/14/1991 | EP0440711A1 Method of producing titanium |
| 08/13/1991 | US5039336 Fluidized bed chlorination |
| 08/07/1991 | EP0439744A1 Method for separating copper impurities from molybdate solutions |
| 07/31/1991 | CN1053378A Production process of tungsten powder for non-droop tungsten filament |
| 07/31/1991 | CN1013352B Manufacturing technique of supper-fine molybdenum powder |
| 07/30/1991 | US5035742 Reduced chromium-ore bearing powder and method for producing the same |
| 07/30/1991 | US5035404 Retort assembly for kroll reductions |
| 07/30/1991 | CA1286896C Tantalum powder process |
| 07/23/1991 | CA1286507C Process for the preparation of the lithiothermy of powdered metals |
| 07/17/1991 | EP0436718A1 Method of charging ore in melt-reduction |
| 07/16/1991 | US5032372 For oxidic metallic ores |
| 07/16/1991 | US5032176 Powder metallurgy, reducing titanium tetrachloride |
| 06/26/1991 | CN1012967B Extraction method of separating tungsten and molybdenum |
| 06/12/1991 | CN1052148A High purity zr and hf metals and their manufacture |
| 06/12/1991 | CN1052070A Method for producing ta powder used in capacitor |
| 06/11/1991 | US5023059 Recovery of metal values and hydrofluoric acid from tantalum and columbium waste sludge |
| 06/11/1991 | US5022935 With a metal, heating to liquify deoxidant, cooling, purification of surface |
| 05/30/1991 | WO1991005881A3 A method for removing chromium from chromium containing waste material |
| 05/29/1991 | EP0428915A1 Improved method for beneficiating titanium bearing material containing iron |
| 05/22/1991 | CN1012646B Catalysising crystallizing and growing method of columbite from kind of slag |
| 05/21/1991 | US5017219 Utilization of sponge metal fines |
| 05/15/1991 | EP0426731A1 Sintered high titanium agglomerates. |
| 05/08/1991 | EP0426375A1 Method for producing high-purity metallic chromium |
| 05/07/1991 | US5013533 Process for recovering valuable metals from spent catalysts |
| 05/02/1991 | WO1991005881A2 A method for removing chromium from chromium containing waste material |
| 04/30/1991 | US5011666 Method for purifying TiO2 ore |
| 04/30/1991 | CA1283523C Method of purifying tantalum |
| 04/23/1991 | US5009788 Method for removing organic and tungsten from sodium sulfate solution |
| 04/16/1991 | US5007960 Drying, sizing, mixing with alkali, heating in the presence of oxygen, extracting water soluble chromate, evaporating |
| 04/10/1991 | CN1050563A Controlling oxygen content in tantalum material |
| 04/10/1991 | CN1050562A Method for controlling oxygen content of tantalum material |
| 04/03/1991 | EP0420393A1 System and method for atomizing a titanium-based material |
| 03/26/1991 | CA1281907C Metallurgical composites and processes |
| 03/20/1991 | EP0417296A1 Direct smelting process |
| 03/19/1991 | CA1281552C Further improvements in tungsten recovery |
| 03/12/1991 | US4999051 System and method for atomizing a titanium-based material |
| 02/13/1991 | CN1049188A Recovery of scandium, yttrium and lanthanides from titanium ore |
| 02/13/1991 | CN1011581B Production of elements and compounds by deserpentinization of ultramatic rock |
| 02/12/1991 | CA1279994C Tungsten recovery |
| 02/07/1991 | DE4002728C1 Sepg. copper from ammonium molybdate - comprises precipitating copper ions using sulphide precipitating agent |
| 02/06/1991 | EP0411162A1 Method of removing chlorine from exhaust gases |
| 02/06/1991 | EP0202327B1 Recovering vanadium values from ammonium bicarbonate solution using heat, sulfuric acid, and ammonium sulfate |
| 02/04/1991 | CA2022600A1 Recovery of scandium, yttrium and lanthanides from titanium ore |
| 01/30/1991 | EP0410496A1 Preparing TiO2 concentrates |
| 01/23/1991 | EP0409805A1 A device for the decontamination of a casting mould, particularly for castings of titanium and the like |
| 01/23/1991 | EP0409420A1 Hybrid chromium recovery |
| 01/22/1991 | US4986742 Extraction of titanyl sulfate with an organophosphorus compound |
| 01/20/1991 | CA2017196A1 Hybrid chromium recovery process |
| 01/16/1991 | EP0408383A1 Highly purified titanium material, method for preparation of it and sputtering target using it |
| 01/15/1991 | US4985069 Induction slag reduction process for making titanium |
| 01/15/1991 | US4985067 Process and device for implementing hot chemical processes |
| 01/09/1991 | EP0407312A1 Apparatus for obtaining materials made of a substrate and a planar shaped coating of purified titanium |
| 01/09/1991 | CN1011143B Metallurgical composites and processes |
| 01/08/1991 | US4983215 Novel liquid metal seal on zirconium or hafnium reduction apparatus |
| 01/01/1991 | US4981510 Process and apparatus for the production of ferrochromium |
| 12/27/1990 | CA1278169C Process for the production of titanium dioxide pigments |
| 12/18/1990 | US4978511 Converting vanadium to insoluble compound, separating |
| 12/13/1990 | WO1990015162A1 Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases |
| 12/13/1990 | CA2047188A1 Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases |
| 12/12/1990 | CN1047701A Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases |
| 12/04/1990 | US4975116 Method for production of metals of ferroalloys by direct reduction |
| 11/21/1990 | CN1047109A Process for smelting reduction of cr materials, and smelting reduction furnace therefor |
| 11/15/1990 | WO1990013680A1 A process for jointly producing metal chlorides |
| 11/13/1990 | CA1276072C Process for producing niobium metal of an ultrahigh purity |
| 11/12/1990 | WO1990013614A1 Production of acid soluble titania |
| 11/06/1990 | US4968481 Free-flowing |
| 11/06/1990 | CA1275831C Zirconium and hafnium with low oxygen and iron |
| 11/06/1990 | CA1275811C Process for producing high purity zirconium and hafnium |
| 10/30/1990 | US4966761 Process for treatment of flyash |
| 10/30/1990 | US4966760 Method for recovering chromium from chromium-bearing material |
| 10/23/1990 | US4964973 Method and apparatus for producing titanium |