US PATENT SUBCLASS 148 / 513
.~ Treating loose metal powder, particle or flake

Current as of: June, 1999
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148 /   HD   METAL TREATMENT

95  DF  PROCESS OF MODIFYING OR MAINTAINING INTERNAL PHYSICAL STRUCTURE (I.E., MICROSTRUCTURE) OR CHEMICAL PROPERTIES OF METAL, PROCESS OF REACTIVE COATING OF METAL AND PROCESS OF CHEMICAL-HEAT REMOVING (E.G., FLAME-CUTTING, ETC.) OR BURNING OF METAL {17}
513.~ Treating loose metal powder, particle or flake

DEFINITION

Classification: 148/513

Treating loose metal powder, particle or flake:

(under subclass 95) Process wherein (1) loose metal or metal alloy powder, particle or flake in a solid or semisolid state is cooled or heat treated to modify or maintain the internal physical structure (i.e., microstructure) or chemical properties and not elsewhere provided or (2) solid or semisolid metal or metal alloy is cooled or heat treated to modify or maintain the internal physical structure (i.e., microstructure) or chemical properties and loose metal powder, particle or flake is produced therefrom (e.g., comminuting).

SEE OR SEARCH CLASS

75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, etc., appropriate subclasses for processes of producing or purifying loose metal or metal alloy powder or for loose metal powder compositions.

(1) Note. Class 75 takes purification of metal powder compositions that involve washing or cleaning operations and

includes utilization of a vacuum, per se, therefor. However, Class 148 takes heat-treatment of solid or semi-solid metal powder involving chemical or physio-chemical operations to alter the metal composition (e.g., decarburizing, dehydrogenating, denitridizing, etc.).

502, Catalyst, Solid Sorbent or Support Therefor: Product or Process of Making, particularly

300+, for process of making metal catalysts. The line to other classes are expressed in Class 502.