| Patents for C01G 49 - Compounds of iron (8,643) |
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| 10/29/1991 | CA1291318C Process for the preparation of isometric magnetic iron oxide pigments |
| 10/29/1991 | CA1291317C Process for the preparation of bright, color-pure iron oxide red pigments |
| 10/15/1991 | US5057290 Cooling without freezing, precipitation, separating crystals from supernatant, recycling supernatant; efficiency |
| 10/09/1991 | CN1055205A Solid multi-component membranes, electrochemical reactor components reactor for oxidation reactions |
| 10/09/1991 | CN1055131A Prodn process of hard-magnetic ferrite material by using open hearth dust as raw material |
| 10/08/1991 | US5055214 Magnetic material for microwave and millimeter wave frequencies |
| 10/08/1991 | US5055136 Heat-stable iron oxide black pigments, processes for their production and their use |
| 10/01/1991 | US5053156 Oxidation of magnetite or mill scale powders, mixing iron oxides and stronium or barium oxides or carbonates, calcining in inclined rotary kiln |
| 10/01/1991 | US5053144 Method for the multistage, waste-free processing of red mud to recover basic materials of chemical industry |
| 10/01/1991 | CA1289727C Highly magnetic iron oxide powder |
| 09/24/1991 | US5051201 Preparation of finely divided hexagonal ferrite powder |
| 09/24/1991 | US5051186 Extraction of solutions with an organic solvent followed by stripping |
| 09/24/1991 | US5051143 Alkali metal azide, alkali metal perchlorate oxidizer |
| 09/17/1991 | US5049335 Cooling melt to solidify; compressive pressurization |
| 09/17/1991 | US5049195 Color pure iron oxide pigments, a process for their preparation and their use |
| 09/17/1991 | US5049193 Heat stable iron oxide pigments of upsilon-Fe2 O3 structure, a process for their production and their use |
| 09/11/1991 | EP0445965A1 Low power loss Mn-Zn ferrites |
| 09/11/1991 | CN2084473U Poly iron reactor with accelerating concentration and oxidation structure |
| 09/10/1991 | US5047382 Diluting gaseous iron compound with oxygen at temperatures of negligible oxidation rate, and then oxidizing to form fine particles |
| 09/10/1991 | US5047161 Magnetic recording media |
| 09/03/1991 | CA1288542C Oxide sol using reactive monomer as dispersion medium |
| 08/28/1991 | EP0442951A1 Precipitant or flocculant for treatment of waste water and process involving their use |
| 08/27/1991 | US5043016 Mixed iron, manganese oxide |
| 08/21/1991 | EP0442022A2 Method of forming ferrite coatings |
| 08/14/1991 | EP0440958A1 Process for preparing black manganese-iron pigment |
| 08/13/1991 | US5039559 Method of making magnetically attractable particles |
| 08/13/1991 | US5039553 Treating magnetic iron oxide powder with alkaline solution, adding cobalt salt, heating under pressure |
| 08/13/1991 | US5039496 Process for selective extraction of contaminant elements from mixtures of electrolytes in solution |
| 08/08/1991 | WO1991011544A1 Method and device for regeneration of iron chloride solution for pickling of copper |
| 08/07/1991 | EP0439762A1 Process for the preparation of storage stable and free flowing ferrous sulphate |
| 08/07/1991 | EP0439695A2 Brown occlusion pigments and process for manufacturing them |
| 08/07/1991 | EP0439620A1 Method of producing pulverized perovskite compound |
| 08/07/1991 | EP0439524A1 Method for preparing magnetic particles of hexaferrites, particles obtainted and product containing them |
| 08/07/1991 | EP0394316A4 Process for beneficiating particulate solids |
| 08/04/1991 | CA2035528A1 Black manganese/iron oxide pigment, a process for its production and its use |
| 08/01/1991 | DE4002608A1 Free running ferrous sulphate hepta:hydrate prodn. - by mixing moist and dry salt in required ratio, useful as flocculant and in pigment mfr. |
| 08/01/1991 | DE4002564A1 Brown to grey zirconium silicate inclusion pigment - contg. iron manganese mix oxide as discrete phase, useful in ceramic e.g. glaze |
| 07/31/1991 | EP0438902A2 Electrochemical reactors and multicomponent membranes useful for oxidation reactions |
| 07/31/1991 | CA2035100A1 Process for the production of storable, free-flowing hydrated ferrous sulfate |
| 07/30/1991 | US5035746 Calcining zirconium, silicon, iron and titanium oxides to form crystals of iron titanates in zirconiu silicate as a discrete phase |
| 07/25/1991 | WO1991010620A1 Ceramic precursor mixture and technique for converting the same to ceramic |
| 07/25/1991 | WO1991010505A1 LAYERED DOUBLE HYDROXIDE SORBENTS FOR THE REMOVAL OF SOx FROM FLUE GAS AND OTHER GAS STREAMS |
| 07/24/1991 | CN1053222A Producing process for poly-ferric sulphate |
| 07/23/1991 | CA1286476C Process of preparing a preferred ferric sulfate solution, and product |
| 07/16/1991 | US5032369 Sludge formation |
| 07/16/1991 | US5032367 Method for producing powdered iron oxide |
| 07/16/1991 | US5032180 Process for the production of iron oxide yellow pigments |
| 07/16/1991 | CA1286100C Magnetic powders for magnetic recording media and magnetic recording media employing said magnetic powder therein |
| 07/10/1991 | CN1052835A Process for preparing iron sulfate by leaching of iron ore oxidation and acid |
| 07/10/1991 | CN1013103B Preparation technique of hydrous ferrous sulphate |
| 07/10/1991 | CN1013102B Method for producing iron oxide red from iron borne soot of steel smelting |
| 07/09/1991 | US5030371 Process for preparing acicular ferromagnetic material consisting essentially of iron-containing chromium dioxide |
| 07/09/1991 | US5030332 Method for making magnetic oxide precipitates |
| 07/04/1991 | DE4015804A1 Prepn. of water purifying and opt. disinfecting chemical - contg. trivalent iron by oxidn. of ferrous salt in aq. slurry using solid chlorate or perchlorate |
| 07/03/1991 | EP0417194A4 Method and apparatus for purifying hydrogen fluoride |
| 07/02/1991 | US5028403 Metal recovery with monothiophosphinic acids |
| 07/02/1991 | US5028401 Vertically coupled cylindrical modules for aerosol reactions |
| 07/02/1991 | US5028269 Co-containing magnetic pigments, processes for the production thereof and the use thereof |
| 06/25/1991 | US5026605 With copper or manganese compound |
| 06/19/1991 | CN1052295A Basic ferric sulfate mixing and coagulant agent for water treatment |
| 06/19/1991 | CN1052293A Rapid producing method for polymerzing ferric sulfate |
| 06/12/1991 | CN1052098A Process for continuous production of high-purity iron oxide from ferrous salt |
| 06/11/1991 | CA1284844C Brine treatment using ethylene/carboxylic acid polymers |
| 06/04/1991 | US5021231 Recycling; utilizes spent sulfuric acid; sulfur dioxide contamination limited |
| 05/30/1991 | WO1991007352A1 Ferrates of alcaline or alcaline earth metals, their preparation and industrial applications |
| 05/28/1991 | US5019169 Gray-black encapsulated pigments and method for their preparation |
| 05/22/1991 | EP0428389A2 Process for producing metal hydroxide sol |
| 05/22/1991 | EP0428387A2 Process for producing powder material for lead perovskite ceramic |
| 05/16/1991 | DE3937468A1 Re-extn. of iron from organic soln. contg. citrate ester extractant - by pptn. in the aq. phase as iron phosphate by mixing with aq. phosphoric acid at 50-90 deg. C and iron:acid mol. ratio 1:2-4 |
| 05/08/1991 | CN1051155A Process for making iron polymer used in water purification |
| 05/07/1991 | CA1283984C Removal of metals from solutions |
| 04/23/1991 | US5009712 Brown potassium ferrites |
| 04/23/1991 | CA1283254C Heat resistant yellow pigments, processes for their preparation and their use |
| 04/17/1991 | EP0422755A1 Plate-like maghemite particles and process of producing the same |
| 04/17/1991 | EP0422105A1 Metal oxide ceramic powders and methods of making same. |
| 04/16/1991 | US5008097 Aqueous solution containing a new ferric ferrous salt Fe2 Cl5 and method of producing same |
| 04/10/1991 | EP0421213A2 Chromium containing magnetic iron oxide pigments process for their fabrication and their application |
| 04/10/1991 | EP0421189A1 Process for the preparation of finely divided pulverised hexagonal ferrite and its use in the preparation of magnetic recording media |
| 04/03/1991 | EP0420525A2 Recycling metal containing compositions |
| 04/03/1991 | EP0419964A2 Red iron oxide or brown iron oxide microbeads, their preparation and their use |
| 04/02/1991 | US5004504 Transparent iron oxide pigments |
| 03/29/1991 | CA2020757A1 Recycling metal containing compositions |
| 03/28/1991 | CA2026120A1 Iron oxide red and iron oxide brown microgranulates, a process for their preparation and their use |
| 03/26/1991 | US5002751 Highly-coercive isometric iron oxides, a process for the production and the use thereof |
| 03/26/1991 | US5002609 Iron oxide black pigment granules, processes for their preparation and their use |
| 03/20/1991 | EP0417567A2 Process for manufacturing hematite pigmentary platelets |
| 03/20/1991 | EP0417194A1 Method and apparatus for purifying hydrogen fluoride. |
| 03/19/1991 | US5000865 Method for the production of alkaline-earth ferrites and lead ferrites for memory cores |
| 03/13/1991 | EP0416648A2 Method of micaceous iron oxide (mio) pigment production |
| 03/13/1991 | EP0416403A1 Magnetic iron-oxide pigment, production method and application |
| 03/13/1991 | CN1011962B Technique for producing ferroferric oxide black |
| 03/13/1991 | CN1011961B Method for producing iron oxide red from iron borne soot of steel smelting |
| 03/12/1991 | US4999323 Production of ceramic powders by emulsion precipitation processes and the products thereof |
| 03/07/1991 | WO1991002697A1 Method of producing pulverized perovskite compound |
| 02/27/1991 | EP0328534B1 A process for the preparation of magnetic hexaferrite particles, particles obtained and products containing them |
| 02/27/1991 | CN1049487A Method for making polymerized ferric sulfate |
| 02/27/1991 | CN1049486A Method for separating ultrafine iron oxide from waste mother liquor from rutile production by dilute hydrochloric acid |
| 02/26/1991 | US4996189 Oxidastion of metal compounds, heating |
| 02/19/1991 | US4994255 Oxidation of ferrous chloride directly to chlorine in a fluid bed reactor |
| 02/13/1991 | CN1049142A High-fineness magnetic iron oxide made by by-product ferrous iron salt |