| Patents for C01G 28 - Compounds of arsenic (688) |
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| 05/29/1991 | EP0428547A1 Manufacture of high purity low arsenic anhydrous hydrogen fluoride |
| 05/28/1991 | US5019364 Method for purifying gaseous hydrides |
| 04/02/1991 | US5004821 Used In Epitaxy Processes For Production Of Semiconductors; Reduction Of Phenylarsonic Acid With Zinc |
| 03/26/1991 | US5002748 Arsenic and copper compounds to form copper arsenate precipitate |
| 02/12/1991 | US4992207 Composition for extraction of metal ions and oxanions |
| 02/12/1991 | CA1279977C Wood preservative compositions and a process for their production |
| 01/23/1991 | EP0276209B1 Process for separating arsenic from acid solutions which contain it |
| 01/22/1991 | CA1279174C Manufacture of arsenic acid |
| 01/01/1991 | US4981569 Electric-field emulsion-breaking device |
| 12/11/1990 | US4976832 Method for making arsenic acid |
| 12/04/1990 | US4975167 Process for production of pure tungstic acid or molybdic acid from impure alkali metal tungstate or molybdate solutions |
| 12/04/1990 | US4974816 Controlling oxidation |
| 11/28/1990 | EP0399035A1 Method of removing arsenic and/or other amphoteric elements from sludge and solid waste materials. |
| 10/09/1990 | US4962228 Catalysts, catalyst supports |
| 10/09/1990 | US4961909 Process for the manufacture of copper arsenate |
| 09/25/1990 | US4959203 Preparation of copper arsenate |
| 09/19/1990 | CN1045379A Internal heating process and equipment for obtaining as |
| 08/07/1990 | CA1272464A1 Method of recovering gallium from scrap containing gallium |
| 06/28/1990 | WO1990006820A1 Method of removing arsenic and/or other amphoteric elements from sludge and solid waste materials |
| 06/20/1990 | EP0373163A1 Manufacture of high purity low arsenic anhydrous hydrogen fluoride |
| 05/30/1990 | EP0370233A1 Process for the removal of impurity elements from electrolyte solutions containing valuable metals |
| 05/29/1990 | US4929435 Manufacture of high purity low arsenic anhydrous hydrogen fluoride |
| 05/09/1990 | EP0366836A1 Preparation of pure titanium tetrachlorides and solutions of titanium tetrachlorides |
| 05/03/1990 | WO1990004654A1 Method for separating interfering elements from valuable metal electrolyte solutions |
| 04/28/1990 | CA2001564A1 Process for selective extraction of contaminant elements from mixtures of electrolytes in solution |
| 03/13/1990 | US4908191 Burning arsine in the presence of oxygen to form arsenic oxide, removing arsenic oxide by washing gas stream, recovering water, recirculating, precipitating arsenic oxide |
| 02/27/1990 | US4904412 Emulsion-forming composition |
| 02/07/1990 | EP0353256A1 METHOD OF PURIFYING AND DEPOSITING GROUP IIIb AND GROUP Vb COMPOUNDS TO PRODUCE EPITAXIAL FILMS. |
| 01/25/1990 | WO1990000521A1 Manufacture of high purity low arsenic anhydrous hydrogen fluoride |
| 01/24/1990 | CN1006545B Preparation of bi and as2o3 from arsenic sulfide |
| 01/17/1990 | EP0351107A1 Manufacture of high purity low arsenic anhydrous hydrogen fluoride |
| 01/02/1990 | US4891207 Efficiency |
| 12/19/1989 | US4888207 Recovery of arsenic from ores and concentrates |
| 11/28/1989 | CA1263239A1 Process for separating arsenic from acid solutions which contain it |
| 11/09/1989 | EP0294387A4 Method and apparatus for biological processing of metal-containing ores. |
| 10/25/1989 | CN2046499U Pipeline connecting device of preparing high-pure liquid chlorides |
| 10/18/1989 | EP0337304A1 Use of monophenylarsines or diphenylarsines for the preparation of epitaxial layers in the gas phase |
| 09/26/1989 | US4869893 Preparation of high purity compounds of sulfur, selenium, and tellurium |
| 09/26/1989 | CA1261589A1 Predetermined and enhanced densification in sintered metal oxides |
| 07/25/1989 | EP0221057A4 Disposable chemical container. |
| 07/25/1989 | CA1257765A1 Process of removing arsenic from waste sulfuric acid |
| 07/11/1989 | US4846853 Layered divalent metal hydrogen phosphates |
| 06/21/1989 | EP0321438A2 Piezoelectric crystal element, and method of making the same |
| 03/22/1989 | CN1031824A Process for oxidation treatment of ash with large numbers of arsenic and antimony and its product |
| 02/14/1989 | US4804494 Wood preservative compositions and a process for their production |
| 01/17/1989 | US4798764 Arsenate dopant sources and method of making the sources |
| 01/17/1989 | CA1248855A1 Arsenate dopant compounds |
| 12/14/1988 | EP0294387A1 Method and apparatus for biological processing of metal-containing ores. |
| 11/17/1988 | WO1988008891A1 METHOD OF PURIFYING AND DEPOSITING GROUP IIIa AND GROUP Va COMPOUNDS TO PRODUCE EPITAXIAL FILMS |
| 11/16/1988 | CN88102171A New technology for extracting arsenic white without pollution |
| 11/08/1988 | US4783324 Preparation of pure titanium tetrachlorides and solutions of titanium tetrachlorides |
| 10/11/1988 | CA1242864A1 Process for recovering arsenic trioxide from exhaust gas of smelting |
| 10/04/1988 | US4775479 Process for selectively recovering Ge and as from aqueous solutions |
| 09/28/1988 | EP0283961A2 Process and composition for purifying arsine, phosphine, ammonia and inert gases to remove Lewis acid and oxidant impurities therefrom |
| 09/28/1988 | EP0283740A2 Oxidative dissolution of gallium arsenide and separation of gallium from arsenic |
| 09/20/1988 | US4772296 Method of purifying and depositing group IIIa and group Va compounds to produce epitaxial films |
| 09/14/1988 | EP0282218A2 Layered divalent metal compositions |
| 09/07/1988 | EP0280826A1 Process for synthesizing arsin by reducing arsenious oxide |
| 09/06/1988 | US4769230 Process for preparation of arsenic acid |
| 08/31/1988 | EP0280439A1 Manufacture of high purity low arsenic anhydrous hydrogen fluoride |
| 08/25/1988 | WO1988006139A1 Manufacture of high purity low arsenic anhydrous hydrogen fluoride |
| 08/03/1988 | EP0276209A1 Process for separating arsenic from acid solutions which contain it. |
| 08/02/1988 | US4761395 Process and composition for purifying arsine, phosphine, ammonia, and inert gases to remove Lewis acid and oxidant impurities therefrom |
| 07/26/1988 | US4759917 Oxidative dissolution of gallium arsenide and separation of gallium from arsenic |
| 07/12/1988 | US4756899 Manufacture of high purity low arsenic anhydrous hydrogen fluoride |
| 07/06/1988 | CN85107157B Wet process for extracting white arsenic from smoke dust containing arsenic |
| 05/11/1988 | DE3637643A1 Method for the arsenic decontamination of aqueous solutions |
| 05/03/1988 | US4741894 Method of producing halide-free metal and hydroxides |
| 04/27/1988 | EP0264993A1 Process for selectively winning germanium and/or arsenic from aqueous solutions |
| 04/12/1988 | US4737350 Process for separating arsenic from acid solutions which contain it |
| 03/15/1988 | US4731187 Removal of heavy metals from waste water |
| 02/09/1988 | US4723992 Spreading iron, chromium, or aluminum salts with a weak acid on to surface |
| 01/07/1988 | EP0251432A2 Method of producing halide-free metal oxides |
| 12/15/1987 | US4713229 Removing heavy metals; diorganyl dithiophosphoric acid ester, adsorbent, reductant |
| 11/11/1987 | EP0244682A1 Wood preservative compositions and a process for their production |
| 11/03/1987 | CA1228734A1 Process for the separation of arsenic from acid solutions containing it |
| 10/20/1987 | US4701311 Extraction with polyhydroxybenzenes in organic diluents |
| 08/13/1987 | WO1987004694A1 Method and apparatus for biological processing of metal-containing ores |
| 05/19/1987 | US4666575 Method of recovering gallium from scrap containing gallium |
| 05/13/1987 | EP0221057A1 Disposable chemical container |
| 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 |
| 04/28/1987 | EP0203189A4 Method of recovery of gold and other metals. |
| 04/22/1987 | EP0219213A2 Method of recovering gallium from scrap containing gallium |
| 04/21/1987 | US4659552 Scavengers for the removal of impurities from arsine and phosphine |
| 04/01/1987 | CN85107157A Wet process for extracting white arsenic from smoke dust containing arsenic |
| 03/24/1987 | US4652380 Method of treating the arsenic containing filter media from phosphoric acid purification |
| 03/11/1987 | EP0213244A1 Manufacture of arsenic acid |
| 02/25/1987 | EP0211305A2 Metal scavenging process |
| 02/12/1987 | WO1987000867A1 Process for separating arsenic from acid solutions which contain it |
| 01/06/1987 | US4634579 Precipitation |
| 12/16/1986 | US4629656 Ion exchange inorganic films made up of layered structure insoluble acid salts or tetravalent metals and/or their derivatives, and process for the preparation of same |
| 12/03/1986 | EP0203189A1 Method of recovery of gold and other metals |
| 11/20/1986 | WO1986006705A1 Disposable chemical container |
| 10/28/1986 | CA1213150A1 Recovery of precious metals |
| 09/02/1986 | US4609484 Solid solutions of tetravalent metal phosphates and phosphites |
| 06/19/1986 | WO1986003480A1 Method of recovery of gold and other metals |
| 05/13/1986 | US4588564 Process for recovering arsenic trioxide from exhaust gas of smelting |
| 05/10/1986 | CN85104205A Comprehensive utilization of arsenic fitler cake |
| 05/07/1986 | EP0180110A1 Process for separating arsenic from acid solutions containing it |
| 04/30/1986 | EP0179242A2 Process for the purification of phosphoric acid |