US PATENT SUBCLASS 419 / 1
POWDER METALLURGY PROCESSES WITH HEATING OR SINTERING

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


419 /   HD   POWDER METALLURGY PROCESSES

1POWDER METALLURGY PROCESSES WITH HEATING OR SINTERING {16}
2  DF  .~> Making porous product
3  DF  .~> Making articles of indefinite length {1}
5  DF  .~> Making composite or hollow article {2}
10  DF  .~> Metal and nonmetal in final product {5}
23  DF  .~> Powder shape or size characteristics {1}
25  DF  .~> Controlled cooling after sintering
26  DF  .~> Post sintering operation {3}
30  DF  .~> Powder pretreatment (prior to consolidation or sintering) {6}
38  DF  .~> Consolidation of powder prior to sintering {4}
44  DF  .~> Pretreatment of consolidated powders
45  DF  .~> Sintering which includes a chemical reaction
46  DF  .~> Alloying occurs during sintering
47  DF  .~> Liquid phase sintering
48  DF  .~> Heat and pressure simultaneously to effect sintering {4}
53  DF  .~> Plural heating steps including sintering {2}
56  DF  .~> Special medium during sintering {1}

DEFINITION

Classification: 419/1

POWER METALLURGY PROCESSES WITH HEATING OR SINTERING:

(under the class definition) Processes for producing metals, metalloys or metal containing composition in a solid state from powdered or particulate material including a heating or sintering operation, i.e., without melting all of the ingredients.

(1) Note. The term sintering includes the union of finely divided material or powder by the action of heat with or without pressure. The heat must result from a positive application of heat at some point in the process. Heat resulting from the application of pressure alone is not considered to be a positive application of heat in these subclasses. Some, but not all of the ingredients may melt. A chemical reaction such as reduction may occur during sintering.

SEE OR SEARCH THIS CLASS, SUBCLASS:

61+, for similar processes which do not apply sufficient heat

to effect sintering.