| Patents for C01G 41 - Compounds of tungsten (1,848) |
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| 07/26/1990 | WO1990008103A1 Process for producing tungsten monocarbide |
| 06/13/1990 | EP0372771A1 Method of preparing heteropolyacid catalysts |
| 06/13/1990 | CN1008374B Mfr. of an inorganic mo-w yellow dye |
| 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 |
| 04/10/1990 | US4916101 Ion exchange, pyrolysis |
| 04/10/1990 | EP0341266A4 Superconductivity in square-planar compound systems. |
| 03/20/1990 | US4910000 Method of extracting tungsten values from tungsten containing ores |
| 02/28/1990 | EP0355296A2 Tungsten-halophosphine complexes suitable for CVD, and process for their production |
| 02/01/1990 | DE3826281A1 Transition metal chalcogenide of the composition MX2, process for the preparation of MX2 material and use thereof |
| 01/10/1990 | EP0350344A1 Layered intercalated metal oxides, and process for their preparation |
| 12/26/1989 | US4889665 Process for producing ultrafine particles of ceramics |
| 11/21/1989 | US4882131 Process for recovering tungsten from organic solutions |
| 11/15/1989 | EP0341266A1 Superconductivity in square-planar compound systems. |
| 09/20/1989 | EP0333084A2 Method for preparing gaseous fluorides |
| 08/29/1989 | US4861565 Method of separately recovering metal values of petroleum refining catalyst |
| 08/03/1989 | DE3802236A1 Mixture of material for producing a metal chalcogenide and use of such a mixture |
| 08/01/1989 | US4853359 Separated by alkali metal layer; |
| 07/25/1989 | CA1257766A1 Process for producing fluorides of metals |
| 07/19/1989 | CN1033978A Method for preparation of ammonium paratungstate or sodium tungstate with high molybdenum removing efficiency |
| 06/29/1989 | DE3743267A1 Process for preparing ammonium metatungstate |
| 06/14/1989 | CN1004469B Process for separating pb, as si from sodium tangstate solution |
| 06/13/1989 | CA1255473A1 Production of ammonium tetrathiotungstate |
| 05/03/1989 | CN1032651A Removal of molybdenum from sodium tungstate solution by active carbon adsorption process |
| 04/25/1989 | US4824222 Solid solution of molybdenum, tungsten, zirconium and/or niobium; vanadium and/or titanium |
| 04/18/1989 | US4822590 Forms of transition metal dichalcogenides |
| 02/07/1989 | US4803062 Method for producing tungsten hexachloride |
| 01/17/1989 | US4798708 Process for recovering chromium and other metal values from chromium bearing material |
| 11/29/1988 | CA1245457A1 Recovery of tungsten from ammoniacal solutions |
| 11/15/1988 | US4784688 Tungsten recovery |
| 11/15/1988 | US4784687 Hydrogen peroxide and promoters for multistage extraction |
| 10/12/1988 | EP0286503A1 Conducting oxide-nitride perovskites, their preparation and their use, particularly as an electrode material |
| 09/21/1988 | CN87101927A Production of secondary ammonium tungstate from fine tungsten mud or low-grade refractory tungsten ore |
| 09/07/1988 | EP0280812A1 Superconductivity in square - planar compound systems |
| 08/10/1988 | CN87107765A Super conductivity in squar-planar compound systems |
| 08/09/1988 | US4762695 Methods for preparing high-purity molybdenum or tungsten powder and high-purity oxides powder of the same |
| 07/26/1988 | US4759915 Process for extracting tungsten from alkali metal tungstate solutions |
| 07/14/1988 | WO1988005029A1 Superconductivity in square-planar compound systems |
| 06/29/1988 | CN86108390A Preparation of secondary ammonium tungstate with high purity using two-step ion exchange method |
| 06/28/1988 | US4753916 Oxidation catalysts, methanol to formaldehyde |
| 06/28/1988 | CA1238473A1 Method of producing crystalline ammonium metatungstate |
| 06/21/1988 | US4752460 Inorganic compounds based on bismuth vanadate |
| 06/01/1988 | CN86100031B Processing of calcium-contg. tungstenic ore |
| 05/19/1988 | WO1988003697A1 Rhenium generator system and method for its preparation and use |
| 05/17/1988 | US4744972 Method for production of highly dielectric powder |
| 05/03/1988 | US4741893 Process for producing fluorides of metals |
| 05/03/1988 | US4741886 Process for recovering tungsten from tungsten bearing material containing arsenic |
| 04/13/1988 | CN86105274A Intermediates and process for antibiotics |
| 03/23/1988 | CN87105337A Mineral treatment |
| 03/16/1988 | CN85100737B Extraction of tungsten by using primary amine-neutral donor reagent |
| 01/26/1988 | US4721606 Recovery of metal values from spent catalysts |
| 01/20/1988 | CN86106868B Production method of catalyzer for tungsten carbide |
| 01/14/1988 | WO1988000249A1 Tungsten extraction from ore |
| 12/16/1987 | CN86106868A Production method of catalyzer for tungsten carbide and t-type carbonization stove special for the method |
| 11/19/1987 | EP0245670A2 Transition metal dichalcogenide compounds |
| 10/28/1987 | EP0242804A2 Novel transition metal dichalcogenide catalysts |
| 10/14/1987 | CN86102308A Process for making the pulverous tungstate by using the tungsten concentrate |
| 10/13/1987 | US4699851 Heteropolytungstic and molybdic acids containing carbon; molding; electro-conductivity; fuel cell |
| 09/30/1987 | EP0239526A2 Inorganic compounds based on bismuth vanadate |
| 08/05/1987 | EP0230515A1 Method for the production of a powder having a high dielectric constant |
| 06/03/1987 | EP0224209A2 Process for recovery of rare metals |
| 06/02/1987 | US4670229 Slurrying, oxygen pressurization leaching |
| 05/27/1987 | CN85108533A Processing for extracting molybdenum from tungsten by solvent |
| 05/26/1987 | US4668653 Method for the incorporation of metals into high temperature antimony oxide |
| 04/29/1987 | EP0219787A2 Process for obtaining pure tungstic acid/and or molybdic acid (water soluble isopolyacids) from alcaline tungsten and/or molybdenum metal salt solutions containing in particular silicon, phosphorus, arsenic ions and the like impurities |
| 04/29/1987 | CN85101918A Method of thermal decomposition with additive for the preparation of ammonium metatungstate from ammonium paratungstate |
| 03/31/1987 | US4654131 Recovery of tungsten valves from alkaline solutions |
| 02/25/1987 | EP0211084A1 Cell with solid electrolyte |
| 02/10/1987 | US4642207 Process for producing ultrafine particles of ceramics |
| 01/13/1987 | US4636248 Method for production of dielectric powder |
| 01/06/1987 | US4634585 Catalysts; color forming material for electrochromic display element |
| 12/31/1986 | CN85103826A Making ammonium meta-tungstate process by continuous electrolysis |
| 12/16/1986 | US4629606 Recovery of tungsten compounds |
| 12/16/1986 | US4629503 Process for the recovery of tungsten in a pure form from tungsten-containing materials |
| 12/10/1986 | EP0204564A2 Method of separating molybdenum or tungsten from non-volatile contaminants |
| 12/02/1986 | US4626425 By adding hexamethylene tetramine to form a complex; precipitation |
| 12/02/1986 | US4626424 Method of producing crystalline ammonium metatungstate |
| 11/25/1986 | US4624844 Process for producing ammonium paratungstate |
| 11/18/1986 | US4623534 Complexing with hexamethylenetetramine |
| 11/05/1986 | EP0200318A1 Further improvements in tungsten recovery |
| 11/05/1986 | EP0200317A2 Improvements in tungsten recovery |
| 11/05/1986 | EP0200170A2 Method for producing ammonium metatungstate from ammonium paratungstate |
| 10/15/1986 | EP0197271A1 Methods for preparing high-purity molybdenum or tungsten powder and high-purity oxides powder of the same |
| 10/01/1986 | EP0196027A1 Method of producing crystalline ammonium metatungstate |
| 09/17/1986 | EP0194346A1 Recovery of tungsten from ammoniacal solutions |
| 09/16/1986 | US4612183 Method of producing crystalline ammonium metatungstate |
| 09/16/1986 | US4612182 Method of producing crystalline ammonium metatungstate |
| 09/16/1986 | US4612181 Method of producing crystalline ammonium metatungstate |
| 09/16/1986 | US4612180 Method of producing crystalline ammonium metatungstate |
| 09/10/1986 | CN86100321A Technique for producing tungstic acid |
| 09/10/1986 | CN86100031A Processing of calcium-containing tungstenic ore |
| 09/03/1986 | EP0193171A2 Method of producing crystalline ammonium metatungstate |
| 09/03/1986 | EP0192824A1 Method of producing crystalline ammonium metatungstate |
| 08/27/1986 | EP0192426A2 Removal of sodium ions from alkaline aqueous solutions by means of an electrolytic membrane process |
| 08/27/1986 | CN85100350A Processing of tungsten ore |
| 08/26/1986 | CA1210218A1 Complex metal chalocogenides |
| 08/20/1986 | CN85100779A Mfr. of an inorganic mo-w yellow dye |
| 08/05/1986 | US4604277 Production of ammonium tetrathiotungstate |
| 08/05/1986 | US4604265 Oxidation, then removal of volatilized rhenium oxide |
| 07/31/1986 | WO1986004320A1 Solid electrolyte |
| 07/30/1986 | CN85100737A To extract rhenium and tungsten by using primary amine-neutral donor reagent |