| Patents for C01G 41 - Compounds of tungsten (1,848) |
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| 07/29/1986 | US4603043 Controllable nitrate fusion |
| 07/08/1986 | US4599223 Separation of tungsten from rhenium |
| 07/08/1986 | US4599222 Recovery of tungsten and rhenium |
| 05/20/1986 | CA1204727A1 Process using complex metal chalcogenides |
| 04/22/1986 | US4584185 Precipitating tungsten with hydrochloric acid, then precipitating rhenium with sulfide compound |
| 04/01/1986 | CA1202472A1 Method of producing tungsten oxide |
| 12/24/1985 | US4560539 Adding sodium hydroxide to maintain high ph while heating |
| 12/10/1985 | US4557924 Method of producing crystalline ammonium metatungstate |
| 12/10/1985 | US4557923 Controlling ph |
| 12/10/1985 | US4557906 Recovery of rhenium |
| 11/12/1985 | US4552729 Method for removing tin from sodium tungstate solution |
| 11/05/1985 | US4551315 With sulfuric acid |
| 11/05/1985 | US4551314 Process for improving solvent extraction operation using two mixers |
| 10/15/1985 | US4547369 Alkali or alkaline earth metal or ammonium salt of 9-antimonio-iii-21-tungsto-vi-sodate |
| 10/08/1985 | US4545973 Molybdenum or tungsten compounds, high temperature lubricants |
| 10/02/1985 | EP0156617A2 Production of metal fluorides |
| 09/10/1985 | CA1193105A1 Tungsten recovery from tungsten ore concentrates by caustic digestion |
| 07/30/1985 | US4532111 Recovery of catalysts as W, Mo or Ru oxychlorides in liquid phase chlorination of pyiridine compounds |
| 06/04/1985 | US4521381 Recovery of rhenium |
| 05/07/1985 | US4515757 Stripping a solution containing molybdenum, tungsten and/or vanadium values |
| 05/07/1985 | US4515756 Adsorption on hydrous iron oxide |
| 04/02/1985 | US4508701 Extraction of tungsten from spent or scrap catalyst materials |
| 03/12/1985 | US4504461 Process for producing ammonium metatungstate |
| 03/12/1985 | US4504448 Activated carbon adsorption of flotation reagents from tungsten solutions |
| 02/26/1985 | CA1183004A1 Solvent extraction of tungsten from aqueous tungstate solutions |
| 02/26/1985 | CA1183003A1 Autoclave tungstate upgrading of scheelite concentrates |
| 02/26/1985 | CA1183002A1 Separation of trace molybdenum from tungstate solutions |
| 02/12/1985 | CA1182277A1 Purification of ammonium tungstate solutions |
| 02/05/1985 | CA1181952A1 Process for conditioning tungsten concentrates |
| 01/22/1985 | CA1181240A1 Treatment of sodium tungstate leach liquor containing dissolved silica, phosphorus, and fluorine impurities |
| 01/16/1985 | EP0131084A1 Lubricating compositions and process using complex metal chalcogenides |
| 01/02/1985 | CA1180192A Autoclave soda digestion of refractory scheelite concentrates |
| 12/25/1984 | US4490339 Process for recovering tungsten from MoS3 /WS3 precipitates |
| 12/19/1984 | EP0128262A1 Complex metal chalcogenides |
| 11/13/1984 | US4482526 Recovery of tungsten and molybdenum from sulfur-bearing material |
| 10/30/1984 | CA1176852A1 Autoclave soda digestion of scheelite concentrates with feedback control |
| 10/09/1984 | CA1175663A1 Combined autoclave-soda digestion of wolframite and scheelite |
| 10/09/1984 | CA1175662A1 Chemical treatment of low-grade wolframite concentrate having high mo/wo.sub.3 ratio |
| 10/02/1984 | CA1175239A1 Wet oxidation of organic matter |
| 08/14/1984 | US4465604 Lubricating compositions and process using complex metal chalcogenides |
| 06/12/1984 | US4454098 Also containing arsenic; digestion with alkali metal hydroxide, slurrying with water, adding ferric salt |
| 05/22/1984 | US4450144 Mixing and shearing with aqueous ammonium hydroxide with a maximum ph gradient |
| 05/15/1984 | US4448755 Method for removal of tin from ammonium tungstates |
| 04/25/1984 | EP0105873A1 Hydrous iron adsorbent, process for preparing the same and process for using the same in the extraction of tungsten and/or molybdenum from solution |
| 04/17/1984 | US4443414 Process for separation of molybdenum from tungsten leachates |
| 02/28/1984 | US4434141 Leaching spent hydroprocessing catalysts |
| 02/21/1984 | US4432949 Precipitating vanadium by cooling, extraction of nickel with hydroxyoxime, cobalt with oximes, dioximes, or diketones, and molybdenum and tungsten with tertiary amine |
| 12/27/1983 | CA1159224A1 Compounds formed by combining transition metal halides or oxyhalides, or aluminium chloride, with alkaline earth metal halides |
| 12/20/1983 | US4421727 NF4+ WF7- and NF4+ UF7- and methods of preparation |
| 10/27/1983 | WO1983003595A1 Hydrous iron oxide adsorbent, process for preparing the same and process for using the same in the extraction of tungsten and/or molybdenum from solution |
| 10/11/1983 | US4409189 Recovery of tungsten from brines |
| 09/27/1983 | US4406866 Tungsten, oxidation |
| 08/09/1983 | US4397821 Low sulfur content |
| 07/27/1983 | EP0028648B1 Method for recovering molybdenum from tungsten solutions |
| 06/21/1983 | CA1148362A1 Method for recovering molybdenum from tungstate solutions |
| 05/17/1983 | US4383980 Process for extracting tungsten and molybdenum values from solution |
| 04/05/1983 | US4379126 Process for recovering tungsten values from alkali solutions |
| 02/22/1983 | US4374713 Solvent extraction of tungten from electrolyte solution in separate container before electrowinning |
| 02/15/1983 | US4374099 Recovery of tungsten values from alkali tungstate solutions by solvent extraction |
| 02/15/1983 | US4374008 Process for separating tungsten from coinage metals |
| 01/18/1983 | US4369165 Recovery of tungsten values from alkali tungstate solutions by solvent extraction |
| 12/21/1982 | US4365155 Scintillator with ZnWO4 single crystal |
| 12/07/1982 | US4362552 Froth flotation of ores |
| 11/30/1982 | CA1136422A1 Recovery of tungsten values from tungsten- bearing materials |
| 11/23/1982 | US4360503 Recovery of tungsten values from alkali tungstate solutions by solvent extraction |
| 11/23/1982 | US4360502 Recovery of tungsten values from alkali tungstate solutions by solvent extraction |
| 11/11/1982 | WO1982003849A1 Tungsten recovery from tungsten ore concentrates by caustic digestion |
| 10/12/1982 | US4353881 Tungsten recovery from tungsten ore concentrates by caustic digestion |
| 10/12/1982 | US4353880 Tungsten recovery from tungsten ore concentrates by caustic digestion |
| 10/12/1982 | US4353879 Tungsten recovery from tungsten ore concentrates by caustic digestion |
| 10/12/1982 | US4353878 Tungsten recovery from tungsten ore concentrates by caustic digestion |
| 10/06/1982 | EP0061976A1 Purification of ammonium tungstate solutions |
| 09/28/1982 | US4351808 Forming a slurry and extraction of tungsten oxide |
| 09/14/1982 | US4349515 Tungsten production from raw materials containing phosphorus impurities |
| 09/14/1982 | US4349423 Process for decomposing hard metal scrap |
| 08/24/1982 | US4346061 Purification of ammonium tungstate solutions |
| 08/11/1982 | EP0057524A1 Treatment of sodium tungstate leach liquor containing dissolved silica, phosphorus, and fluorine impurities |
| 08/05/1982 | WO1982002540A1 Wet oxidation of organic matter |
| 08/05/1982 | WO1982002539A1 Autoclave soda digestion of refractory scheelite concentrates |
| 08/03/1982 | US4342728 Process for digesting tungsten ores containing organic matter |
| 07/28/1982 | EP0056715A1 Chemical treatment of low-grade wolframite concentrate having high Mo/W03 ratio |
| 07/28/1982 | EP0056714A2 Separation of trace molybdenum from tungstate solutions |
| 07/13/1982 | US4339424 Tungsten, molybdenum, oxidation |
| 07/06/1982 | US4338287 Process for conditioning tungsten concentrates |
| 06/08/1982 | CA1124989A1 Heteropolyanion compounds containing tungsten combined with antimony |
| 05/04/1982 | US4328190 Solvent extraction of tungsten from aqueous tungstate solutions |
| 04/20/1982 | US4325919 Autoclave soda digestion of scheelite concentrates with feedback control |
| 04/13/1982 | US4324768 Reaction of lead monoxide with acid in presence of hydroxylamine salt |
| 03/16/1982 | US4320096 Combined autoclave soda digestion of wolframite and scheelite |
| 03/16/1982 | US4320095 Autoclave soda digestion of refractory scheelite concentrates |
| 03/16/1982 | CA1119775A1 Process for preparation of lead compounds |
| 03/02/1982 | CA1119003A1 Process for extracting tungsten from alkali metal tungstate solutions |
| 02/23/1982 | US4316746 Acetic acid, nitric acid |
| 02/02/1982 | US4313914 Autoclave tungstate upgrading of scheelite concentrates |
| 01/19/1982 | US4311679 Treatment of sodium tungstate leach liquor containing dissolved silica, phosphorus, and fluorine impurities |
| 12/08/1981 | US4304729 Compounds formed by combining transition metal halides or oxyhalides, or aluminum chloride, with alkaline earth metal halides |
| 12/01/1981 | US4303623 Sulfiding |
| 12/01/1981 | US4303622 Chemical treatment of low-grade wolframite concentrate having high Mo/WO3 ratio |
| 09/21/1981 | EP0028648A4 Method for recovering molybdenum from tungsten solutions. |
| 09/08/1981 | US4288413 Sulfiding |