| Patents for C22B 15 - Obtaining copper (5,364) |
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| 10/26/1976 | US3988224 Method of extraction of metallic elements from submarine nodules |
| 10/26/1976 | US3988149 Metallurgical process using oxygen |
| 10/26/1976 | US3988148 Metallurgical process using oxygen |
| 10/19/1976 | US3987224 Oxygen control in continuous metal casting system |
| 10/19/1976 | US3986866 Method of recovery of metal compounds and metals from nitrate solutions |
| 10/12/1976 | US3985856 Removal of iron from aqueous acid solutions containing iron and copper |
| 10/12/1976 | US3985855 Leaching copper ores with an alkali metal hydroxide and diatomaceous earth; hydroxy copper(ii) complex |
| 10/12/1976 | US3985555 Treating with an acid and a metallic reductant |
| 10/12/1976 | US3985553 Process for the recovery of copper and ammonium sulphate from copper-bearing mineral sulphide ores or concentrates |
| 10/05/1976 | US3984235 Treatment of converter slag |
| 09/28/1976 | US3983208 Recovery of vanadium and copper catalyst metals using ketones |
| 09/21/1976 | US3981966 Zinc recovery from acidic aqueous streams |
| 09/21/1976 | US3981962 Decomposition leach of sulfide ores with chlorine and oxygen |
| 09/14/1976 | US3980470 Method of spray smelting copper |
| 08/24/1976 | US3976472 Method and an electrically heated device for producing molten metal from powders or lumps of metal oxides |
| 08/17/1976 | US3975190 Hydrometallurgical treatment of nickel and copper bearing intermediates |
| 08/17/1976 | US3975189 Recovery of copper sulphide and nickel from solution |
| 08/10/1976 | US3974253 Leaching of copper ores to recover sulfur and silver catalyst |
| 08/03/1976 | US3972711 Cuprous chloride recovery process |
| 07/27/1976 | US3971652 Leaching |
| 07/20/1976 | US3970737 Metal, particularly gold, recovery from adsorbed cyanide complexes |
| 07/13/1976 | US3969107 Combined process for working up pure and complex copper concentrates |
| 07/06/1976 | US3967958 Method of winning copper, nickel, and other metals |
| 07/06/1976 | US3967957 Aqueous ammonia oxidative leach and recovery of metal values |
| 06/29/1976 | US3966890 Method of producing solutions containing cuprous ions |
| 06/29/1976 | US3966462 Recovery of nitric acid soluble transition metals from sulfur and iron containing ores of the same |
| 06/22/1976 | US3964901 Multistage |
| 06/08/1976 | US3962402 Extraction of copper as copper sulfate |
| 06/08/1976 | US3962051 Ni, cu, s |
| 06/08/1976 | US3961942 Oxidation leaching |
| 06/08/1976 | US3961908 Autoclave system for leaching sulfide concentrates |
| 06/01/1976 | US3961028 Method of producing cuprous sulfate and bisulfate solutions |
| 05/25/1976 | US3959097 Selenium rejection during acid leaching of matte |
| 05/25/1976 | US3958985 Inorganic acids, heat treatment |
| 05/25/1976 | US3958983 Reacting with an aqueous solution of chromium, vanadium or titanium ore |
| 05/25/1976 | US3958978 Process for copper metal ore reduction |
| 05/18/1976 | US3957602 Recovery of copper from chalcopyrite utilizing copper sulfate leach |
| 05/18/1976 | US3957506 Catalytic water treatment to recover metal value |
| 05/18/1976 | US3957503 Extraction of zinc and lead from their sulfides |
| 05/18/1976 | US3957485 Reduction smelting of manganese nodules with a liquid reductant |
| 05/11/1976 | US3955965 Refining metals |
| 05/04/1976 | US3954453 Sulfur dioxide |
| 04/20/1976 | US3951649 Leaching with ferric chloride, ion exchanging with sulfuric acid, hydrometallurical reduction |
| 04/20/1976 | US3951646 Process to make brittle boiler dust adhering to the water tube surface of a waste heat boiler of non-ferrous metal smelting furnace |
| 04/13/1976 | US3950488 Ion exchanging |
| 04/13/1976 | US3950487 Solvent-in-pulp extraction of copper and nickel from ammoniacal leach slurries |
| 04/13/1976 | US3950486 Method for separating metal constituents from ocean floor nodules |
| 04/06/1976 | US3949051 Comminution, leaching |
| 04/06/1976 | US3948639 Process and device for flash smelting sulphide ores and concentrates |
| 03/30/1976 | US3947543 Process for recovering copper and noble metals from organic residues |
| 03/23/1976 | US3945820 Refining |
| 03/09/1976 | US3942974 Manganese nodule pelletizing |
| 03/02/1976 | US3941793 Quinoline 2 carboxylic acids used in metal extraction processes |
| 03/02/1976 | US3941587 Metallurgical process using oxygen |
| 02/17/1976 | US3939089 Etching solutions for copper and copper alloys and etching process using the same |
| 02/10/1976 | US3937667 Precipitation, drops, gelation |
| 02/10/1976 | US3937657 Disproportionation of cuprous salts |
| 01/20/1976 | US3933635 Zinc smelter effluent, reductionchemical |
| 01/20/1976 | US3933478 Recovery of zinc and copper from brass scrap |
| 01/20/1976 | US3933475 Extraction of copper from copper sulfides |
| 01/13/1976 | US3932505 Hydrazide salts |
| 01/13/1976 | US3932170 Copper, iron, nickel sulfide ores |
| 01/06/1976 | US3930847 Recovery of copper by cementation |
| 01/06/1976 | US3930846 Method for precipitating copper metal from copper bearing solutions |