| Patents for C01G 49 - Compounds of iron (8,643) |
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| 05/08/1990 | US4923519 Magnetic iron oxide pigments and a process for their preparation |
| 05/03/1990 | WO1990004654A1 Method for separating interfering elements from valuable metal electrolyte solutions |
| 05/03/1990 | WO1990004570A1 Method for preparing magnetic particles of hexaferrites, particles obtainted and product containing them |
| 05/02/1990 | EP0366370A2 Plate-like composite oxide fine particles containing mainly Ba and Fe, and a process for producing the same |
| 05/02/1990 | EP0366313A1 Method of producing mixed metal oxide material, and of producing a body comprising the material |
| 05/02/1990 | EP0365719A2 Preparation of doped materials containing barium or strontium and iron |
| 05/01/1990 | US4921542 Finely divided iron oxide black pigments, a process for their preparation and their use |
| 04/28/1990 | CA2001564A1 Process for selective extraction of contaminant elements from mixtures of electrolytes in solution |
| 04/25/1990 | EP0364904A2 Purified solution containing iron and manganese, and method producing thereof |
| 04/25/1990 | EP0240530B1 Particulate compositions of ferromagnetic metal oxalates in the form of submicronic needle shaped particles, preparation and application thereof |
| 04/24/1990 | US4919776 Formation of metal layer on the surface of metal oxide particles |
| 04/24/1990 | US4919772 Electrolytic cell/process for the reduction of titanium/iron solutions |
| 04/24/1990 | US4919727 Oxidation resistant, heat resistant iron oxide black pigments, a process for their preparation and their use |
| 04/18/1990 | CN1041336A Direct synthetic method for preparing iron trichloride from iron-containing smoke |
| 04/11/1990 | CN1041146A New prodn process of iron trichloride with industrial waste acid |
| 04/10/1990 | US4915742 Iron blue pigment, process for its pigmentation and use |
| 04/10/1990 | EP0302912A4 Process for preparation of monodispersed barium containing ferrites. |
| 04/04/1990 | EP0362157A2 Process for converting ionic valence number and apparatus employed therefor |
| 04/04/1990 | EP0361349A2 Magnetic fine particles of epsilon' iron carbide |
| 04/03/1990 | US4913890 Heating precipitated iron/iii/ hydroxide and complexing agent as unfiltered aqueous suspension |
| 03/27/1990 | US4911760 Color pure iron oxide pigments, a process for their preparation |
| 03/21/1990 | EP0249843B1 Manufacturing process for black iron oxide pigments having high tinting strength, obtained by the nitrobenzenereduction method |
| 03/21/1990 | CN1040572A Manufacturing method for ceramics and products thereof |
| 03/21/1990 | CN1040565A Combination method for preparation of polyferricsulphate and iron oxide black |
| 03/13/1990 | CA1266553A1 Process for the removal of undesirable metal ions, especially vanadium ions, in the concentration of dilute iron (ii) sulfate-containing sulfuric acid solutions |
| 03/06/1990 | US4906382 Method of magnetizing nonmagnetic materials |
| 02/28/1990 | EP0356279A1 Process for the obtention of a transparent magnetic material with a high resistance |
| 02/28/1990 | EP0356136A2 A method for neutralizing sulfuric acid containing zinc ion |
| 02/28/1990 | CN1040015A Preparation for submicron particle of ferriferous oxide |
| 02/27/1990 | US4904530 Ferrite particles; high information density |
| 02/14/1990 | EP0354843A1 Process for the preparation of alkyl or alkaline earth ferrates by the solid phase |
| 02/14/1990 | EP0354314A1 Thermally stable iron oxide pigments with a gamma-iron oxide structure, process for manufacturing them and their use |
| 02/14/1990 | CN1039571A Technology for making products from waste liquor of iron and steel rust-removing |
| 02/13/1990 | CA1265665A1 Process for drilling mud additive preparation and additive for drilling mud |
| 02/07/1990 | EP0353630A2 Rare earth-containing magnetic carrier particles |
| 02/07/1990 | EP0353627A2 Interdispersed two-phase ferrite composite |
| 02/06/1990 | US4898801 Magnetic carrier of developer for electrophotographic copying machines composed of ferrite and a selected metal oxide |
| 02/06/1990 | US4898619 Pigment compositions |
| 02/06/1990 | CA1265535A1 Removal of impurities from amines |
| 01/31/1990 | EP0352422A2 Process for the production of fine particles of alkaline earth and lead ferrites for data carriers |
| 01/24/1990 | EP0351775A1 Manufacturing process of magnetic strontiumhexaferrite powder |
| 01/17/1990 | EP0350625A1 Ion oxide pigments, process for their preparation and their use |
| 01/17/1990 | EP0147464B1 Chemically active aqueous solution and solid substance containing ferrous ion |
| 01/09/1990 | US4892672 Process for controlling ferrous iron content in manganese zinc ferrite |
| 01/02/1990 | US4891206 Process for the removal of undesirable metal ions, especially vanadium ions, in the concentration of dilute iron(II) sulfate-containing sulfuric acid solutions |
| 12/27/1989 | EP0348384A2 Process and apparatus for producing metal oxides |
| 12/27/1989 | EP0347681A2 Thermostable black iron oxide pigments, process for their preparation and use thereof |
| 12/26/1989 | US4889697 Method of refining ferrous ion-containing acid solution |
| 12/14/1989 | WO1989012027A1 Metal oxide ceramic powders and thin films and methods of making same |
| 12/14/1989 | DE3917502A1 Process for preparing microcrystalline barium ferrite platelets |
| 12/13/1989 | EP0345578A1 Thermally stable zinc ferrite colouring pigments, process for manufacturing them and their use |
| 12/13/1989 | EP0240529B1 Compositions of particulate magnetic oxides with a structure of the lacunar spinel type, preparation and application thereof |
| 12/13/1989 | CN1037888A Sol-gel methd of making ceramics |
| 12/13/1989 | CN1037883A Process for preparation of ferric chloride from ferrous chloride |
| 12/13/1989 | CN1037882A Process for preparation of ferric chloride from dilute chlorhydric acid |
| 12/13/1989 | CN1037881A Process for synthesis of ferric chloride |
| 12/13/1989 | CN1037880A Method for producing permanent-magnet ferrite materials from magnetite ore |
| 12/12/1989 | US4886714 Platelike magnetic powder and a recording medium which uses the platelike magnetic powder |
| 12/07/1989 | DE3819019A1 Fluid for improving laser-induced optical perforation |
| 11/30/1989 | WO1989011321A1 Method and apparatus for purifying hydrogen fluoride |
| 11/29/1989 | EP0343934A2 Magnetically attractable particles and method of preparation |
| 11/29/1989 | EP0343283A2 Iron oxide for ferrite |
| 11/22/1989 | CN1037282A Catalyst for dehydrogenating organic compounds, process for its preparation and its use |
| 11/21/1989 | US4882183 Coating with supersaturated liquid, fluorine additive |
| 11/09/1989 | EP0294387A4 Method and apparatus for biological processing of metal-containing ores. |
| 11/08/1989 | EP0340689A2 Iron carbide fine particles and process for preparing the same |
| 11/08/1989 | CN1036938A Technique for producing ferroferric oxide black |
| 11/02/1989 | EP0340071A1 Process for the preparation of ferric chloride from ferrous chloride |
| 11/02/1989 | EP0340070A1 Process for the synthesis of iron (III) chloride |
| 11/02/1989 | EP0340069A1 Process for the preparation of ferric chloride with diluted hydrochloric acid |
| 11/02/1989 | EP0339704A1 Catalyst for dehydrogenating organic compounds, a process for its preparation and its use |
| 11/02/1989 | EP0339401A1 Method for regenerating pickling acids of zinc coating process |
| 10/31/1989 | US4877743 Monitoring reaction of nitrous oxide to form nitrogen |
| 10/25/1989 | EP0338799A2 Sol-gel method of making ceramics |
| 10/24/1989 | US4876412 Catalysis of methanol to hydrocarbons; calcined hydrate |
| 10/24/1989 | US4876022 Cobalt ferrite |
| 10/17/1989 | US4874668 Magnetic powder and magnetic recording medium comprising the same |
| 10/11/1989 | EP0335987A1 Process for producing chevrel compounds |
| 10/11/1989 | EP0190352B1 Alkali metal-carrying substance, and its use as catalyst |
| 10/11/1989 | CN1005409B Re-extraction by phase transfer in extracting of iron with acidic phosphate |
| 10/04/1989 | CN2045381U Circulating jet reactor for polymerizing ferric sulfate |
| 09/26/1989 | CA1261667A1 Carrier for use in electrophotographic developers |
| 09/26/1989 | CA1259773A1 Flocculating agents and processes for making them |
| 09/20/1989 | EP0332990A2 Particulate magnetic hexaferrite pigments containing potassium from precipitated magnetite, process for their production and their use |
| 09/19/1989 | US4867795 Luster coatings |
| 09/19/1989 | CA1259601A1 Catalysts |
| 09/12/1989 | US4865833 Refractory spheres, iron, sodium chloride, chlorine, air |
| 09/06/1989 | EP0331054A1 Process for the preparation of acicular alpha-ferric oxide |
| 09/05/1989 | US4863625 Titanium-containing and cobalt-containing manganese-zinc ferrite core and method of manufacturing same |
| 08/23/1989 | EP0328534A1 A process for the preparation of magnetic hexaferrite particles, particles obtained and products containing them. |
| 08/22/1989 | US4859787 Process for the preparation of dialkyldithiocarbamates of multivalent metals |
| 08/16/1989 | EP0327923A1 Black iron oxide pigments able to resist oxidation or heat, process for preparing them and their use |
| 08/10/1989 | WO1989007088A1 Process for producing hexaferrite powder using strontium hydroxide solution |
| 08/09/1989 | EP0327234A1 Extraction of iron from phosphoric acid |
| 08/09/1989 | EP0327147A1 Garnet and methods of preparing a garnet |
| 08/09/1989 | EP0326978A1 Process for the preparation of hexagonal ferrites |
| 08/09/1989 | EP0326976A1 Process for producing hexagonal ferrites |
| 08/08/1989 | US4855206 Rare earth containing magnetic carrier particles |
| 08/08/1989 | US4855205 Spinel and magnetoplumbite phases; for electrostatic printing |
| 08/08/1989 | US4854981 Iron oxide catalyst and method for making same |