US PATENT SUBCLASS 75 / 343
.~ Producing or purifying free metal powder or producing or purifying alloys in powder form (i.e., named or of size up to 1,000 microns in its largest dimension)

Current as of: June, 1999
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75 /   HD   SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES

330  DF  PROCESSES {9}
343.~ Producing or purifying free metal powder or producing or purifying alloys in powder form (i.e., named or of size up to 1,000 microns in its largest dimension) {9}
344  DF  .~.~> Radioactive
345  DF  .~.~> Utilizing electrothermic, magnetic, or wave energy {2}
348  DF  .~.~> Producing or purifying named magnetic material {2}
351  DF  .~.~> Producing alloy {1}
353  DF  .~.~> Utilizing scrap material
354  DF  .~.~> Including comminution {4}
362  DF  .~.~> Decomposition of organo-compound containing metal or metal carbonyl
363  DF  .~.~> At 300 degrees C or greater {5}
370  DF  .~.~> Using nonmetallic material which is liquid under standard conditions {1}

DEFINITION

Classification: 75/343

Producing or purifying free metal powder or producing or purifying alloys in powder form (i.e., named or of size up to 1000 microns in its largest dimension):

(under subclass 330) Process in which a free metal powder is produced or purified or in which alloys in powder form are produced or purified.

(1) Note. In order for a patent to be classified in this subclass, or the subclasses hereunder indented, the claims or disclosure must specifically state that a powder is produced or is purified. A "precipitate" is not considered to be a "powder" for purposes of classification in these subclasses.

(2) Note. "Powder" is defined as a mass of particles, that is, portions of matter so small that they are not ordinarily handled as individual units. According to Metals Handbook, 8th Edition, 1961, Volume I, page 28, metallic powders then used in powder metallurgy had a particle size up to 1,000 microns in their largest dimension, as determined by screens or other suitable instruments. Powder particles generally are

distinguished from filamentary particles in that their shape and length-to-diameter ratio are such that in the dry state the particles will not hold together as a coherent article without the application of pressure or heat, that is, will not become entangled.

(3) Note. If a patent states that a "powder" is produced or purified, the patent is to be placed here regardless of any designation of the size of the "powder".

SEE OR SEARCH THIS CLASS, SUBCLASS:

711, for processes in which nonmetallic material which is liquid under standard conditions is used to form a precipitate.

SEE OR SEARCH CLASS 117, Single-Crystal, Oriented-Crystal, and Epitaxy Growth Processes; Non-Coating Apparatus Therefor, especially

75, 87, 205, and 921, for processes and non-coating apparatus for growing therein-defined single-crystal of all types of materials, including metals, which are in the form of whiskers.

148, Metal Treatment,

240+, for processes in which a reactive coating is produced on solid metal.

148, Metal Treatment,

11.5, for processes in which a powder metal or powder alloy is subjected to working and heat treatment.

148, Metal Treatment,

126.1, for processes in which a particulate metal or particulate alloy is subjected to heat treatment.

419, Powder Metallurgy Processes,

30+, for processes which include preliminary significant treatment, preparation, or manufacture of the powder, prior to any compacting or sintering.

427, Coating Processes,

212+, for processes in which a particulate metal or particulate alloy is coated.