Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7892520 | Solid-state synthesis of iron oxide nanoparticles The present disclosure includes a method for preparing an aqueous dispersion of γ-Fe2O3 nanoparticles. The method includes grinding an iron (II) hydrated salt, an iron (III) hydrated salt, an inorganic salt, and alkali hydroxide in a grinding ... | 02/22/2011 |
| 7442362 | Method for preparing iron oxides Highly pure iron oxides are prepared by reaction of metallic iron, in the form of microspheroidal particles or of scraps or cuttings, with an agitated aqueous solution of a mono- or polycarboxylic acid with a pKa of 0.5 to 6 relative to the first carboxyl and capabl... | 10/28/2008 |
| 7410625 | Process of making metal containing iron oxide and iron sulfide based nanoparticle materials A method and structure for making magnetite nanoparticle materials by mixing iron salt with alcohol, carboxylic acid and amine in an organic solvent and heating the mixture to 200-360° C. is described. The size of the particles can be controlled either by changing ... | 08/12/2008 |
| 7285261 | Preparation and application of novel chromium based nanocatalyst for gas-phase fluorination and hydrofluorination reactions A process of reacting a metal chloride, especially chromium (III) chloride, with an alkali metal oleate at a temperature of from about 30° to about 300° C., and especially at about 70±1° C., in a solvent to form a metal oleate complex, especially a chromium-olea... | 10/23/2007 |
| 6962685 | Synthesis of magnetite nanoparticles and the process of forming Fe-based nanomaterials A method and structure for making magnetite nanoparticle materials by mixing iron salt with alcohol, carboxylic acid and amine in an organic solvent and heating the mixture to 200–360 C is described. The size of the particles can be controlled either by changing t... | 11/08/2005 |
| 6863877 | Iron oxides of reduced chloride content A process for removing chloride from chloridic iron oxide comprises mixing said chloridic iron oxide with an acid and subsequently conducting a thermal treatment at from 50 to 1300° C. ... | 03/08/2005 |
| 6790274 | Method for preparing iron oxides Highly pure iron oxides are prepared by reaction of metallic iron, in the form of microspheroidal particles or of scraps or cuttings, with an agitated aqueous solution of a mono- or polycarboxylic acid with a pKa of 0.5 to 6 relative to the first carboxyl and capabl... | 09/14/2004 |
| 6770773 | Organic acid-Fe-OOH (ferroxane) particles and ferroxane-derived ceramics and ceramic membranes The present invention relates to ferroxanes and a method of making wherein a ferroxane may be defined by the general formula [Fe(O)x(OH)y(O2CR)z]n wherein x, y and z may be any integer or fraction such that 2x+y... | 08/03/2004 |
| 6660242 | Alkaline earth metal ferrite and ferric oxide admixture A method is disclosed for the manufacture of particles composed of an intimate admixture of barium or strontium ferrite and ferric oxide from a chloride solution containing barium or strontium ions and ferrous ions by a pyrohydrolysis reaction. The presen... | 12/09/2003 |
| 6530987 | Method for producing iron oxide pigments from waste acid resulting from TiO2 production Process for the preparation of iron oxide pigments from the waste acid resulting from the preparation of titanium dioxide by the sulfate process, characterized in that in a first stage a partial neutralization of the sulfuric acid contained in the waste a... | 03/11/2003 |
| 6432377 | Particles for non-magnetic undercoat layer of magnetic recording medium, method thereof and magnetic recording medium The present invention provides particles for a non-magnetic undercoat layer of a magnetic recording medium, which comprises acicular hematite particles having an average major axial diameter of not more than 0.3 μm, a geometrical standard deviation in th... | 08/13/2002 |
| 6086846 | Use of synthetic, iron raw materials for preparing iron oxide pigments The invention relates to the use of synthetic (synthetically produced) iron raw materials to prepare iron oxide pigments in the Penniman process and other iron-dissolution processes.... | 07/11/2000 |
| 6080337 | Iron oxide particles Electromagnetic shielding material is formed from a shielding composition made with magnetic particles and a binder, where the magnetic particles have an average diameter less than about 1000 nm and are substantially crystalline. The magnetic particles ca... | 06/27/2000 |
| 6051203 | Thin-walled monolithic metal oxide structures made from metals, and methods for manufacturing such structures Monolithic metal oxide structures, and processes for making such structures, are disclosed. The structures are obtained by heating a metal-containing structure having a plurality of surfaces in close proximity to one another in an oxidative atmosphere at ... | 04/18/2000 |
| 6030688 | Rectangular parallelopipedic lepidocrocite particles and magnetic recording medium containing the particles Rectangular parallelopipedic lepidocrocite particles of the present invention have a minor axial diameter of 0.045 to 0.5 μm, a major axial diameter of 0.05 to 1.0 μm, and a thickness of 0.001 to 0.3 μm, which are individual. Such rectangular parallelo... | 02/29/2000 |
| 5994611 | Method of incinerating plastic products containing ferric oxide hydroxide particles The disclosure describes plastic formed products comprising: one selected from the group consisting of a thermoplastic resin and a thermosetting resin; and 0.1 to 10 wt % of at least one selected from the group consisting of ferric oxide hydroxide particles, h... | 11/30/1999 |
| 5911905 | Processes for producing hydrated iron oxide and ferromagnetic iron oxide In a process for producing hydrated iron oxide which comprises the steps of adding an aqueous alkali solution to an aqueous solution of a ferrous salt in an amount no more than a neutralizing equivalent amount with respect to said ferrous salt, oxidizing ... | 06/15/1999 |
| 5837216 | Use of synthetic, iron raw materials for preparing iron oxide pigments The invention relates to the use of synthetic (synthetically produced) iron raw materials to prepare iron oxide pigments in the Penniman process and other iron-dissolution processes.... | 11/17/1998 |
| 5770172 | Process of forming compounds using reverse micelle or reverse microemulsion systems The present invention is directed to a process for producing a nanometer-sized metal compound. The process comprises forming a reverse micelle or reverse microemulsion system comprising a polar fluid in a non-polar or low-polarity fluid. A first reactant ... | 06/23/1998 |
| 5769937 | High-purity ferromagnetic iron oxide pigments γ-Fe2 O3 pigments and Fe3 O4 pigments with a particle diameter of 2 to 100 nm, a saturation magnetization above 40 nTm3 /g, a remanence below 10 nTm3 /g, a Cr content below 40 mg/kg of pig... | 06/23/1998 |
| 5725802 | Preparation of ultrafine particles from water-in-oil microemulsions Process for preparing ultrafine inorganic particles of size lower than 50 nm, preferably lower than 10, with narrow size distribution, of metals, oxides, sulphides, carbonates by starting from microemulsions of water in a fluorinated oil, preferably a per... | 03/10/1998 |
| 5718880 | Method of increasing the bulk density of iron oxide powder A method is provided of rapidly increasing the bulk density of an iron oxide powder by preventing the powder, processed by a roller consolidation machine, from flying up. The method consists of feeding an iron oxide powder, whose apparent bulk density is ... | 02/17/1998 |
| 5718755 | Preparation and use of iron oxide black pigment granules The present invention relates to a process for the preparation of iron oxide black pigment granules which are stable to handling.... | 02/17/1998 |
| 5597547 | Reduction of residual chloride in iron oxides A process for reducing the residual chloride present in iron oxides, particularly in regenerated iron oxides produced from hydrochloric acid waste liquid generated from steel pickling, by post-synthesis treatment of the iron oxides with yellow iron oxide,... | 01/28/1997 |
| 5531977 | Process for producing acicular γ-FeOOH particles Acicular γ-FeOOH particles useful as precursors for magnetic particles suitable for magnetic recording are produced advantageously in industry. In a reaction of the growth of γ-FeOOH nuclei by oxidizing a suspension containing γ-FeOOH nuclei in a ferro... | 07/02/1996 |
| 5516670 | Magnetophoretic particle delivery method and apparatus for the treatment of cells A method of delivering particles into a cellular specimen such that there is minimal disruption or damage to the specimen. In accordance with the method, a monodispersion of tiny acicular magnetizable particles is formed and that dispersion is placed in c... | 05/14/1996 |
| 5508017 | Process for the preparation of acicular -iron oxide hydrate A process for the preparation of acicular -iron oxide hydrate which comprises oxidizing a slurry of ferrous hydroxide having an excessive alkali concentration of 1.0 mol/l or above with an oxygen-containing gas, interrupting oxidation, adding an ex... | 04/16/1996 |
| 5411801 | Plate-like magnetite particles and process for producing the same Disclosed herein are a process for producing poreless plate-like magnetite particles which have as large a plate ratio (average particle diameter/thickness) as possible and which are discrete each other, the process comprising the step of: obtained by oxi... | 05/02/1995 |
| 5401485 | Reduction of residual chloride in iron oxides A process for reducing the residual chloride present in iron oxides, particularly in regenerated iron oxides produced from hydrochloric acid waste liquid generated from steel pickling, by post-synthesis treatment of the iron oxides with sulfuric acid opti... | 03/28/1995 |
| 5399278 | Process for producing acicular goethite particles and acicular magnetic iron oxide particles Disclosed herein are a process for producing acicular goethite particles comprising the steps of: blowing an oxygen-containing gas into a ferrous salt reaction solution containing colloidal ferrous hydroxide or iron-containing colloidal precipitates which... | 03/21/1995 |
| 5382050 | Gas generator for vehicle occupant restraint A vehicle occupant restraint assembly (12) has an inflatable vehicle occupant restraint (20), a housing (14), a gas generating material (16) within the housing, an igniter (18) for igniting the gas generating material, and gas flow channel (22) for direct... | 01/17/1995 |
| 5378380 | Process for producing acicular geothite particles and acicular magnetic iron oxide particles Disclosed herein are a process for producing acicular goethite particles comprising the step of: blowing an oxygen-containing gas into a ferrous salt reaction solution containing colloidal ferrous hydroxide or iron-containing colloidal precipitates which ... | 01/03/1995 |
| 5376162 | Autogenous roasting of iron ore Iron ore concentrate is converted to magnetic gamma hematite in an autogenous roasting operation which is self-sustaining. The iron ore concentrate is preheated and contained magnetite is oxidized to hematite. Hematite is reduced to magnetite using carbon... | 12/27/1994 |
| 5368933 | Superparamagnetic fine particles of iron oxide and magnetic recording media containing said particles Disclosed herein is superparamagnetic fine particles of iron oxide having an unsaturated fatty acid adsorbed on the surface of superparamagnetic fine particles and having a magnetization of not less than 50 emu/g, the rate of change of the magnetization o... | 11/29/1994 |
| 5348160 | Coal cleaning process Fine particle coal is beneficiated in specially designed dense medium cyclones to improve particle acceleration and enhance separation efficiency. Raw coal feed is first sized to remove fine coal particles. The coarse fraction is then separated into clean... | 09/20/1994 |
| 5316746 | High purity iron oxide and method for production hereof A method for producing high-purity iron oxide which comprises pulverizing iron ore into powder having an average particle diameter of 20-150 μm, removing fine particles from the powder, and subjecting the powder to wet magnetic separation in a magnetic f... | 05/31/1994 |
| 5277368 | Coal cleaning process Fine particle coal is beneficiated in specially designed dense medium cyclones to improve particle acceleration and enhance separation efficiency. Raw coal feed is first sized to remove fine coal particles. The coarse fraction is then separated into clean... | 01/11/1994 |
| 5244494 | Autogenous roasting of iron ore Iron ore concentrate is converted to magnetic gamma hematite in an autogenous roasting operation which is self-sustaining. The iron ore concentrate is preheated and contained magnetite is oxidized to hematite. Hematite is reduced to magnetite using carbon... | 09/14/1993 |
| 5202043 | Process for the preparation of isometric magnetic iron oxide Isometric iron oxide pigments are prepared by an improved process by precipitation of aqueous solutions containing iron (II) salts with alkaline precipitating agents followed by oxidation of the precipitate at temperatures of from 20° C. to 100° C., whe... | 04/13/1993 |
| 5169620 | Method and apparatus for the manufacture of iron oxide particles An improved method of manufacturing superfine iron oxide particles by introducing a gas mixture of a non-oxidizing gas and an iron-containing compound into a stream of heated oxidizing gas, wherein the improvement resides in the use of an insulated inject... | 12/08/1992 |
