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Class 75/359 - Reduction


Subclass of Class 75 - Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
Definition: Process in which a metal compound is reduced to free metal.
No. of patents: 48
Last issue date: 07/14/2009


  2  
NumberTitleIssue Date
4141719Tantalum metal powder
Improved, high-purity agglomerated tantalum powders having an exceptional combination of a relatively low oxygen content, high green strength when pressed into compacts without using any binders, and, when compacted and sintered as anodes for capacitors h...
02/27/1979
4084965Columbium powder and method of making the same
Columbium powder capable of producing anodes of improved electrical capacitance is prepared by the addition of phosphorus-containing materials in amounts from about 5 to about 600 ppm based on elemental phosphorus....
04/18/1978
4054443Method of preparing iron powder
A method for preparing iron powder for powder metallurgy and other applications from particulate iron oxide by reducing the particle size of at least part of the particulate feed material chemically reducing the feed material to increase the percentage of...
10/18/1977
4010024Process for preparing metal having a substantially uniform dispersion of hard filler particles
A process for preparing metal having a substantially uniform dispersion of hard filler particles. The process includes the steps of: admixing metal powder and oxide particles having a negative free energy of formation at 1000° C of at least as great as t...
03/01/1977
3994716Process for the production of finely divided cobalt powders
A process is described for producing cobalt powder having a particle size of about 2 microns or smaller. The process involves two basic operations: Firstly, finely divided cobaltous carbonate is prepared by precipitation from a cobaltous ammine-ammonium s...
11/30/1976
3992192Metal powder production
Metal powders of agglomerated form having a uniform specific surface area for various size fractions thereof in a size spectrum extending from 3 microns to 10 mesh are produced by heating a charge of a salt source of the metal, pre-coated with reducing ag...
11/16/1976
3975186Method of making iron powder
Iron oxide particles are made by spray calcination and the oxide is reduced at least substantially in CO at temperatures between 800° and 1000° C. The oxide is heat-treated prior to calcination or CaO is added to enhance formation of iron fibers. The re...
08/17/1976
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