| Patents for C01G 49 - Compounds of iron (8,643) |
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| 11/04/1981 | EP0039273A1 Method of preparation of magnetic particles with a high coercivity, consisting of cobalt-doped ferrimagnetic iron oxide |
| 10/29/1981 | WO1981003016A1 Process and equipment for the performance of precipitate forming reactions by using an ion-exchange auxiliary phase |
| 10/27/1981 | US4297395 Inorganic pigment by precipitation and oxidation of cobalt-containing aqueous iron salt solution; coercive force |
| 10/27/1981 | CA1111230A1 Production of magnetite from ferrous salt solutions |
| 10/20/1981 | US4295988 Magneto-optic Bi1 Lu2 Fe5 O12 crystals |
| 10/20/1981 | US4295879 Manufacture of acicular ferromagnetic iron particles |
| 10/06/1981 | US4293372 Growth of single-crystal magnetoplumbite |
| 10/06/1981 | CA1110039A1 Reduction of ferric chloride |
| 10/06/1981 | CA1110038A1 Reduction of ferric chloride |
| 10/06/1981 | CA1110010A1 Process for the production of iron oxide red pigments |
| 09/29/1981 | US4292294 Yellow pigments stable at high temperatures |
| 09/29/1981 | US4292119 Growth of single-crystal 2PbO.Fe2 O3 |
| 09/29/1981 | US4292085 Method for converting into a non-polluting particulate product the ferrous sulphate obtained in the production of titanium dioxide by the sulphate process |
| 09/22/1981 | US4291010 Heat stable yellow iron oxides |
| 09/15/1981 | US4289746 Process for preparation of micaceous iron oxide |
| 09/15/1981 | US4289745 Iron spinels |
| 09/08/1981 | US4288414 Process for chlorinating clays and bauxite |
| 08/26/1981 | EP0034434A1 Process for removing metal values from oxidic materials |
| 08/25/1981 | US4285726 Active anti-corrosion pigments based on calcium oxide, aluminium oxide and iron oxide |
| 08/11/1981 | CA1106573A1 Chlorine and iron oxide from ferric chloride - process and apparatus |
| 08/04/1981 | US4282302 Ferrite powder type magnetic toner used in electrophotography and process for producing the same |
| 08/04/1981 | US4282190 Process for the manufacture of iron and aluminum-free zinc chloride solutions |
| 08/04/1981 | US4282189 Precipitation of metal values from organic media |
| 08/04/1981 | US4282185 Chlorine and iron oxide from ferric chloride - apparatus |
| 08/04/1981 | CA1106184A1 Benefication method for iron which residues from electrolytic treatment of zinc |
| 07/28/1981 | US4280904 High capacity folded moving bed ion exchange apparatus and method for treating phosphoric acid |
| 07/14/1981 | US4278556 Pulverizing ferrite in lower alcohol |
| 06/24/1981 | EP0030790A2 The production of a yellow iron oxide pigment |
| 06/23/1981 | CA1103593A1 Method and apparatus for removing gases from particles |
| 06/23/1981 | CA1103462A1 Cyclic process for the production of metallurgically pure alumina |
| 06/02/1981 | US4271234 Iron oxide magnetic pigments for the production of magnetic coatings |
| 06/02/1981 | CA1102183A1 Method of producing magnetic thin film |
| 05/19/1981 | CA1101191A1 Process for recovering magnetite and ammonium sulphate from ammonium jarosite |
| 05/12/1981 | US4267207 Process for producing cobalt-containing ferromagnetic iron oxide powder |
| 04/28/1981 | CA1099902A1 Process for treating waste acids and apparatus therefor |
| 04/14/1981 | US4261966 Process for the preparation of pigment grade iron oxides from ferrous sulphate and the resulting Fe2 O3 pigments |
| 04/14/1981 | US4261959 Process for extracting ferric iron from an aqueous solution |
| 04/08/1981 | EP0026502A1 Process for treating an organic phase containing ferric chloride, molybdenum chloride and hydrochloric acid |
| 04/07/1981 | CA1098719A1 Solvent extraction of non-ferrous metals from iron- containing solutions |
| 03/31/1981 | US4259368 Manufacture of acicular magnetic iron oxide |
| 03/31/1981 | US4259298 Dechlorination in presence of reducing agent, recovering chlorine as chloride of reducing agent |
| 03/17/1981 | US4256723 Aeration, oxidation |
| 03/17/1981 | US4256722 Process for producing porous spinel materials |
| 03/17/1981 | US4256266 Process to obtain anathase concentrates from an anathase ore |
| 03/11/1981 | EP0024693A2 Process for the preparation of acicular ferrimagnetic iron oxide, and its application |
| 03/11/1981 | EP0024692A2 Process for preparing acicular ferromagnetic iron particles, and their use |
| 03/10/1981 | US4255492 Magnetic recording crystals, process for producing same, and magnetic recording webs using same |
| 03/10/1981 | US4255409 Oxidizing a ferrous compound with an alkali metal chlorate |
| 03/10/1981 | CA1097079A1 Process for the preparation of hydrogen-rich gas |
| 03/10/1981 | CA1097057A1 Cobalt-doped acicular hyper-magnetite particles |
| 03/03/1981 | CA1096585A1 Oxidation of metallic iron to black oxide pigments |
| 02/24/1981 | US4252774 Method of processing aluminous ores |
| 02/24/1981 | CA1096328A1 Plasma method of producing selective particle sized oxide, product produced thereby and apparatus therefor |
| 02/18/1981 | EP0024063A1 Process for separating trivalent iron from an aqueous chloride solution |
| 02/17/1981 | US4251504 Addition of alkali hydroxide to an aqueous salt solution; removal of some supernatant from precipitate; oxidation |
| 02/10/1981 | US4250157 Method and apparatus for enriching the iron carbonyl content of a recycle gas stream |
| 02/10/1981 | CA1095262A1 Method for the removal of ferric ions from a concentrated aqueous zinc solution |
| 02/03/1981 | US4248907 Process for preparing magnetic powder |
| 02/03/1981 | US4248851 Obtained from the reaction of waste hydrogen chloride pickle liquor and iron oxide |
| 02/03/1981 | CA1094812A1 Preparation of ferric iron solutions |
| 01/27/1981 | CA1094326A1 Process for the precipitation of iron as jarosite |
| 01/27/1981 | CA1094290A1 Process for the manufacture of an aqueous iron (iii)- chloride-sulfate solution |
| 01/21/1981 | EP0022475A1 Aqueous basic polyaluminum-iron halide solutions and method of preparing |
| 01/20/1981 | CA1093830A1 Recovery of manganese values |
| 01/13/1981 | US4244932 Stabilized ferromagnetic chromium dioxide and process for obtaining same |
| 01/13/1981 | US4244929 Recovery of chlorine values |
| 01/13/1981 | US4244926 Moving bed chlorination of bauxite and ilmenite |
| 01/07/1981 | EP0022098A1 Apparatus for reducing finely divided iron oxide material |
| 12/30/1980 | US4242320 Reduction of ferric chloride |
| 12/23/1980 | US4241038 Using sulfur monochloride |
| 12/23/1980 | CA1092084A1 Method and a reagent mixture for removing metal ions from an aqueous solution by means of liquid-liquid extraction |
| 12/23/1980 | CA1091936A1 Iron removal from solutions |
| 12/11/1980 | WO1980002652A1 Apparatus for reducing finely divided iron oxide material |
| 12/10/1980 | EP0019989A2 Method for producing a solution containing nitrates of iron and chromium and making a high temperature shift catalyst from it |
| 12/09/1980 | US4238466 Absorption of sulfur dioxide from gases by ferrous sulfate |
| 12/02/1980 | US4237111 Ramming, sintering magnetite |
| 12/02/1980 | US4236928 Ceramic compositions |
| 11/25/1980 | US4235861 From iron sulfate oxidized in air |
| 11/25/1980 | CA1090099A1 Process of thermally decomposing salts which contain mainly iron sulfate |
| 11/18/1980 | US4234348 Process for the production of iron oxide red pigments |
| 11/11/1980 | US4233283 Method for manufacture of iron oxide flakes |
| 11/11/1980 | CA1089382A1 Oxidation of ferrous salt solutions |
| 11/11/1980 | CA1089156A1 Process for the preparation of yellow iron hydroxide pigment |
| 11/04/1980 | US4232071 Method of producing magnetic thin film |
| 11/04/1980 | US4232061 Magnetic recording medium and process for producing the same |
| 10/29/1980 | EP0018009A1 Modified acicular magnetic iron oxide, process for its production and its use in producing magnetic-recording supports |
| 10/28/1980 | US4230542 Electrolytic process for treating ilmenite leach solution |
| 10/07/1980 | US4226909 Cobalt-doped acicular hyper-magnetite particles |
| 10/07/1980 | US4226843 Process and apparatus for production of spherical grain ferrite powder |
| 10/07/1980 | US4226838 Goethite-hematite conversion, quick dissolving of diaspore, hydrogarnet catalyst |
| 10/07/1980 | US4226617 Method for treating a mineral sulfide |
| 10/07/1980 | CA1086914A1 Process for production of magnetite spheres with an arc heater |
| 09/30/1980 | US4225352 Iron oxide-calcium oxide composite |
| 09/23/1980 | CA1086076A1 Process for the elimination of accumulated iron in organic phases of fluid-fluid extraction that contain di-2-ethyl-hexyl phosphoric acid |
| 09/16/1980 | US4222997 Concentration, double exchange with sulfuric acid, filtering out ferrous sulfate |
| 09/16/1980 | US4222790 Inorganic pigments, oxides of iron, zinc and/or magnesium |
| 09/16/1980 | CA1085589A1 Recovery of chlorine values from iron chloride by- produced in chlorination of ilmenite and the like |
| 09/16/1980 | CA1085588A1 Process for preparing a red iron oxide pigment |
| 09/16/1980 | CA1085584A1 Process for selectively recovering metal chlorides from gaseous effluent |
| 09/09/1980 | US4221776 From goethite, reduction, oxidation |