Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7288501 | Process and apparatus for the thermal treatment of pulverulent substances Process and apparatus for the thermal treatment of pulverulent substances, in which the pulverulent substance is dispersed in a carrier gas and is passed in a continuous manner through a heated reactor where it is thermally treated and is then quenched by a cooling ... | 10/30/2007 |
| 7163667 | Production process for oxide magnetic material and oxide magnetic material A production process for an oxide magnetic material comprising the steps of blending raw material powder so as to take the composition of a hexagonal ferrite including: at least one kind of an element A selected from the group consisting of Ba, Sr and Ca; Co and Cu;... | 01/16/2007 |
| 6923328 | Method and apparatus for separating metal values Methods and apparatuses for separating metal values, such as nickel and nickel compounds, from mineral ores, including lateritic ores are disclosed. The method includes providing a mixture of particles (e.g., crushed and sized ore) that is composed of at least a fir... | 08/02/2005 |
| 5738717 | Coloring pigment and method of manufacture Coloring pigment of comparable quality to, and cheaper than, pigments products by chemical precipitation, is made from synthetic magnetite produced by oxidation of ferrous mill scale and reduced to a particle size such that preferably at least 85% of the ... | 04/14/1998 |
| 5076836 | Process for the preparation of ferromagnetic metallic particles for magnetic recording A process for the preparation of ferromagnetic metallic particles for magnetic recording which comprises (I) a step of preparing a slurry of acicular iron oxide hydrate containing nickel and, if necessary, manganese, (II) a step of coating the surface of the a... | 12/31/1991 |
| 4661118 | Method for oxidation of pyrite in coal to magnetite and low field magnetic separation thereof A method for increasing the magnetization of pyrite-containing pulverized coal comprises heating the coal in an atmosphere of inert gas, desirably nitrogen, containing 3 to 60 torr, preferably 12 to 16 torr, partial pressure of air to a temperature in the... | 04/28/1987 |
| 4585477 | Method for separating and recovering nickel and copper from complex materials A method of recovering copper and nickel from sulphidic minerals containing copper, nickel and iron comprises the steps of roasting the mineral, preferably to provide magnetite; sulphating, for example with sulphuric acid, sulphur trioxide, metal sulphate... | 04/29/1986 |
| 4543197 | Process for producing magnetic metallic oxide A process for producing magnetic metallic oxide which comprises the steps of pulverizing at least one member selected from the group consisting of ferro-manganese, ferro-nickel, electrolytic manganese, electrolytic iron and electrolytic zinc, adding to th... | 09/24/1985 |
| 4386061 | Method of treating pyrite bearing polymetallic material A method of treating pyrite bearing polymetallic material comprises heating the material in an atmosphere of reducing gases at a temperature of 450° to 500° C. for a period of 30 to 60 min. Gases such as hydrogen, or products of conversion of natural gas or ... | 05/31/1983 |
| 4368176 | Desulfurizing roast of pyrite bearing polymetallic raw material A method comprises heating the material to be treated without access of air at a temperature of 700° to 800° C. for a period of 1-2 hours, and then subjecting this material to subsequent magnetic separation. It is advisable that the furnace walls surrou... | 01/11/1983 |
| 4309390 | Separation of cobalt and manganese from trimellitic acid process residue by extraction, pH adjustment, and magnet Recovery of cobalt and manganese metal oxidation catalysts from residue of trimellitic acid manufacture and separation of recovered cobalt from recovered manganese can be accomplished by a novel method involving dissolving the residue in water, displacing... | 01/05/1982 |
| 4158041 | Separation of ilmenite and rutile This invention relates to a process for separating rutile and ilmenite from ilmenite leach tails and is effected by treating the leach tails from an acidic leach to a flotation step whereby gangue is separated from the unreacted ilmenite and rutile. The l... | 06/12/1979 |
| 4154608 | Production of high purity iron powder High purity iron powder may be obtained by treating an iron bearing source which contains impurities such as silica along with minor amounts of aluminum, calcium and magnesium to a series of steps which include grinding the iron bearing source followed by... | 05/15/1979 |
| 4150095 | Recovering magnetite and ammonium sulphate from ammonium jarosite Ammonium jarosite is converted to hematite or magnetite and ammonium sulphate. The invention can be used for removing iron from a feed solution containing dissolved ferrous sulphate. The feed solution is treated with ammonium sulphate and oxygen to precip... | 04/17/1979 |
| 4137293 | Producing gypsum and magnetite from ferrous sulfate and separating Gypsum and magnetite which are both coarse and of good quality can simultaneously be produced by introducing calcium carbonate into an aqueous solution containing ferrous sulfate while an oxidizing gas is blown, and then carrying out a neutralizing and ox... | 01/30/1979 |
| 4123501 | Oxidation of metallic iron to black oxide pigments A metallic iron-containing starting material such as iron filings, iron powder or a reduced ore such as ilmenite is oxidized with air in the presence of 5 to 40% of iron oxide and/or iron oxide hydroxide nuclei and about 2.5 to 200% of an electrolyte, per... | 10/31/1978 |
| 4054639 | Process for preparing magnetite starting from ferrous sulphate solutions A process is disclosed for preparing magnetite having an equiaxial morphology and a narrow particle size dispersion by precipitation from a ferrous sulphate solution, characterized in that: A. during a first step, at a temperature between 15° and 40° C,... | 10/18/1977 |
| 4025611 | Process for obtaining hyperfine magnetite powder A process is disclosed for producing magnetite having an equiaxial morphology in the state of a hyperfine powder, starting from a solution of a bivalent iron solution, characterized in that: A. an aqueous suspension of Fe(OH)2 is prepared by reactin... | 05/24/1977 |
| 4024232 | Method of preparing magnetite having a controlled particle size, starting from ferrous sulphate solutions A method is disclosed for controlling the particle size of equiaxial magnetite obtained by a process for preparing same starting from ferrous sulphate solutions, characterized in that the reaction forming the magnetite is conducted in a suspension to whic... | 05/17/1977 |
