| Patents for C01G 49 - Compounds of iron (8,643) |
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| 02/12/1991 | US4992248 Method for neutralizing sulfuric acid containing zinc ion |
| 02/12/1991 | US4992191 Containing silicon; heat resistant magnetic toners |
| 02/12/1991 | US4992143 Continuous process for the separation of a partially water soluble component from a slurry |
| 02/06/1991 | CN1011506B Technology and equipment for manufacturing magnetic powder by fluid-bed reduction of iron oxide yellow |
| 02/05/1991 | US4990268 Enhanced oil recovery |
| 02/05/1991 | US4990189 Iron oxide pigments, a process for their preparation and their use |
| 01/29/1991 | US4988671 Roasting in molecular oxygen a bimetallic complex, precipitate d from an aqueous solution. Forming inorganic fibers by annea ling Lanthanide and group 2a metal alloys |
| 01/22/1991 | US4986977 Recovery of useful products from by-products of phosphate conversion coating process |
| 01/15/1991 | US4985380 Method of making thin refractory flakes |
| 01/15/1991 | US4985078 Thermostable zinc ferrite color pigments containing 0.05-0.5 wt % lithium, a process for their preparation and their use |
| 01/09/1991 | EP0406633A2 Synthetic coarse ironoxide, process for its preparation and its use |
| 01/06/1991 | CA2020306A1 Synthetic coarse particled iron oxide, a process for its preparation and its use |
| 01/02/1991 | CN1048205A Production process of ferric polysulfate from low-grade siderite |
| 01/02/1991 | CN1048169A Novel solid multi-component membranes, electrochemical reactor and use of membranes and reactor for oxidation reactions |
| 12/26/1990 | CN1010936B Method for producing iron oxide red using soot from steel making |
| 12/18/1990 | US4978515 Dispersion of solid, powdered precursor in a fluid polymer, heating to burn off polymer |
| 12/18/1990 | CA1277822C Electrically heated fluidised bed reactor and processes employingsame |
| 12/12/1990 | EP0401631A2 A continuous process for the separation of a partially water soluble component from a slurry |
| 12/12/1990 | EP0401624A1 Process for preparing yellow iron oxide pigments |
| 12/09/1990 | CA2018462A1 Process for the production of iron oxide yellow pigments |
| 12/05/1990 | EP0401000A2 Plate-like magnetite particles and process for producing the same |
| 12/05/1990 | EP0400311A2 Metal recovery with monothiophosphinic acids |
| 12/04/1990 | US4975407 Catalyst for dehydrogenating organic compounds, a process for its preparation and its use |
| 12/04/1990 | US4975267 Stable K2 FE22 O34 potassium ferrite phase and method of manufacture |
| 12/04/1990 | US4975214 Magnetic iron oxide containing silicon element and process for producing same |
| 12/04/1990 | US4974816 Controlling oxidation |
| 11/28/1990 | EP0399833A1 Novel solid multi-component membranes, electrochemical reactor and use of membranes and reactor for oxidation reactions |
| 11/28/1990 | EP0399665A1 Method of manufacturing ferrite crystals and method of producing ferrite powders preferably used therefor |
| 11/22/1990 | EP0397885A1 Magnetic powder, its production method, magnetic recording medium and magnetic recording method |
| 11/07/1990 | EP0395872A2 Granular black iron oxide pigment, process for its manufacture and its use |
| 10/31/1990 | EP0394586A1 Plate-like composite ferrite fine particles for magnetic recording and a process for producing the same |
| 10/31/1990 | EP0394316A1 Process for beneficiating particulate solids. |
| 10/30/1990 | US4966749 Sintering a mixture of metal sulfides, metallic molybdenum and molybdenum sulfide under reduced pressure |
| 10/30/1990 | US4966641 By heat treatment under nonoxidizing atmosphere; removes objectionable brown tinge |
| 10/24/1990 | EP0394034A2 Magnetic iron oxide particles |
| 10/24/1990 | EP0393563A2 Acicular cobalt-modified iron oxide and process for its manufacture |
| 10/16/1990 | US4963343 Dehydrogenation catalyst for producing styrene |
| 10/10/1990 | EP0391388A1 Process for production of lepidocrosite |
| 10/10/1990 | EP0391361A2 Process and apparatus for continuous production of cobalt-modified magnetic iron oxide |
| 10/09/1990 | US4961919 Monocrystalline material having garnet structure |
| 10/03/1990 | EP0390634A1 Hydrophobic, cross-linked, polymeric, magnetisable composite microspheres, method for their preparation and their biological uses |
| 10/02/1990 | US4960583 Oxide having a trivalent metal or monovalent metal or any mixture of them |
| 10/02/1990 | US4960582 Roasting the spinel structure nickel ferrite-modified with zinc compound deposites in presence of barium chloride |
| 09/30/1990 | CA2013459A1 Magnetizable composite microspheres of hydrophobic crosslinked polymer, preparation process of same and application in biology |
| 09/19/1990 | EP0387629A2 Magnetic pigments containing cobalt, process for their production and their use |
| 09/19/1990 | EP0387575A1 Process for the preparation of yellow iron oxide pigments |
| 09/19/1990 | EP0387573A1 Fine-grained magnetic hexaferrites with a low temperature dependence of the coercivity, and their use |
| 09/19/1990 | EP0387572A1 Process for preparing iron oxide yellow pigments |
| 09/19/1990 | EP0387571A1 Fine-grained magnetic hexaferrites with a low temperature-dependent coercitive force, and their use |
| 09/18/1990 | US4957658 Process and composition for providing reduced discoloration caused by the presence of pyrithione and ferric ion in water-based paints and paint bases |
| 09/12/1990 | EP0386534A1 Fine-grained magnetic hexaferrites with a negative temperature-dependent coercivity, and their use |
| 09/12/1990 | EP0385991A1 Process for the production of iron oxide having high reactivity and high specific surface. |
| 09/12/1990 | CN1045255A Air oxidizing method for removing ferrous element from water solution and its products |
| 09/12/1990 | CN1009547B Recovery technique of iron oxide red and ammonia sulphate from waste liquid of pickle |
| 09/11/1990 | CA2011839A1 Process for the preparation of iron yellow pigments |
| 09/11/1990 | CA2011838A1 Process for the production of iron oxide yellow pigments |
| 09/07/1990 | WO1990010046A1 Process and composition for providing reduced discoloration caused by the presence of pyrithione and ferric ion in water-based paints and paint bases |
| 09/05/1990 | EP0385453A1 Microwave ceramic magnetic material manufacturing process |
| 09/05/1990 | EP0385249A1 Beige-brown mixed-phase pigments and process for manufacturing them |
| 09/05/1990 | EP0385248A1 Grey-black mixed-phase pigments and process for manufacturing them |
| 09/05/1990 | EP0261590B1 Process for the preparation of metal oxides or mixed metal oxides |
| 09/04/1990 | CA1273647A1 Production of ceramic powders by emulsion precipitation processes and the products thereof |
| 08/28/1990 | US4952463 Precipitation of a crystalline ferritic film to coat the surface of a ceramic |
| 08/28/1990 | US4952386 Filtration, extraction, ion-exchanging, regeneration |
| 08/28/1990 | US4952378 Method for neutralization treatment of sulfuric acid containing iron ions |
| 08/28/1990 | US4952331 Composite magnetic compacts and their forming methods |
| 08/16/1990 | EP0382709A1 Process for working up acidic iron-containing solutions, in particular used pickling liquors |
| 08/15/1990 | CN1044730A Direct extraction of barium, strontium hard magnetic ferrite by use of open hearth dusts |
| 08/14/1990 | CA1272590A1 Ferromatic powder and method for producing the same |
| 08/09/1990 | WO1990008593A1 Method and apparatus for making polycrystaline flakes of magnetic materials having strong grain orientation |
| 08/08/1990 | EP0380532A1 Preparation of thin layers of iron iii oxide for optical and/or magnetic recording. |
| 08/08/1990 | CN1009080B Prepn. of superfine ferrous oxide |
| 08/01/1990 | EP0379805A2 Non-magnetic potassium ferrite pigments, process for preparing them and paint or resin containing them |
| 07/31/1990 | US4945049 Method for preparing magnetic powder |
| 07/31/1990 | CA1272010A1 Basic metal hydroxysulfate complex in solid form and a method for its manufacture |
| 07/25/1990 | EP0379204A1 Liquid oxidizing method and apparatus |
| 07/18/1990 | EP0377821A1 Method for the preparation of particulate magnetic hexagonal ferrites by spray-drying barium salts and iron oxides, and their use |
| 07/10/1990 | US4940572 Process for preparing an iron oxide |
| 07/04/1990 | EP0376033A2 Process for preparing magnetic iron oxides, and pigments thus obtained |
| 07/03/1990 | US4938945 High purity anhydrous FeF3 and process for its manufacture |
| 06/27/1990 | CN1043297A Technology for making polyiron sulfate |
| 06/19/1990 | US4935219 Process for obtaining ferric oxide and ammonium salts |
| 06/19/1990 | CA1270425A1 Magnetooptic garnet |
| 06/13/1990 | EP0372335A2 Black pigment, process for preparing it and its use |
| 06/12/1990 | US4933054 Solid electrolyte with coating on one surface of conductive metal, metal oxide or mixture, second surface coated with metal, metal oxide or mixture |
| 06/12/1990 | US4933014 Cobalt compound coating |
| 06/12/1990 | US4933004 Preparation of acicular ferromagnetic metal particles of substantially iron |
| 05/31/1990 | WO1990005706A1 Precipitant or flocculant for treatment of waste water and process involving their use |
| 05/30/1990 | EP0370233A1 Process for the removal of impurity elements from electrolyte solutions containing valuable metals |
| 05/30/1990 | EP0370067A1 Preparation of thin layers of iron iii oxide for optical and/or magnetic recording. |
| 05/23/1990 | EP0369897A1 Process for the preparation of magnetic hexaferrite particles, particles obtained and product containing them |
| 05/23/1990 | EP0369275A1 Precipitant or flocculant for treating waste water, and process using this agent |
| 05/23/1990 | EP0368919A1 Method for the multistage, waste-free processing of red mud to recover basic materials of chemical industry |
| 05/22/1990 | CA1269225A1 Process for partial oxidation of fecl.sub.2 to fecl.sub.3 |
| 05/17/1990 | WO1990005367A1 Magnetic powder, its production method, magnetic recording medium and magnetic recording method |
| 05/16/1990 | EP0368093A2 Preparation of acicular ferromagnetic material essentially consisting of chromium dioxide with iron |
| 05/16/1990 | CN1042134A Process for the preparation of ferric oxide powder used for ferrite by utilizing smoke dust of oxygen blast open-hearth furnace |
| 05/15/1990 | US4925647 Process for the production of metal oxides or metal mixed oxides |
| 05/09/1990 | EP0366845A1 Method for stabilizing metal ions |
| 05/09/1990 | EP0366834A2 Method for producing powdered iron oxide |