US PATENT SUBCLASS 75 / 255
.~ Loose particulate mixture (i.e., composition) containing metal particles

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

300  DF  COMPOSITIONS {5}
255.~ Loose particulate mixture (i.e., composition) containing metal particles {1}
252  DF  .~.~> Mixture contains particles of nonmetal {2}

DEFINITION

Classification: 75/255

Loose particulate mixture (i.e., composition) containing metal particles:

(under subclass 300) Composition which comprises loose particles of a metal or alloy mixed with loose particles of a different metal or alloy or with loose particles of a nonmetal.

(1) Note. Where a patent claims both the powder metallurgy process and the unconsolidated starting material, it is classified as an original in Class 419 and is cross-referenced here.

SEE OR SEARCH THIS CLASS, SUBCLASS:

228+, for such compositions consolidated to a coherent (self-sustaining) shape or form, without total loss of the particulate nature of the unconsolidated mass, that is, without total fusion of all components of the mass. Patents contained in these subclasses (228+) often contain disclosures of loose metal particles and mixtures of the same.

331+, for processes of producing solid particulate free metal directly from liquid metal.

343+, for processes of producing or purifying free metal powder or producing or purifying alloys in powder form.

SEE OR SEARCH CLASS

106, Compositions: Coating or Plastic,

403+, for metal particle mixtures to be used as a pigment or filler for such compositions.

228, Metal Fusion Bonding,

248, for a process of surface bonding a metal to another metal or a nonmetal where a powdered filler material is employed. Where a patent claims both the bonding process and an unconsolidated metal particle composition used in the bonding as a filler, the patent is placed in Class 228 and is cross-referenced here.

252, Compositions,

181.1+, for "getter" compositions, which may contain metal particles.

417, Pumps,

48+, for a getter-type pump.

419, Powder Metallurgy Processes,

1+, for powder metallurgy processes including sintering.

420, Alloys or Metallic Compositions, for a free metal or a single alloy or metallic composition in particulate form.

427, Coating Processes, 458+, for applying metal particles utilizing an electrostatic charge; subclasses 446+ for plasma spraying processes; subclasses 180+ for other particulate metal coating processes; and subclasses 446+ for flame-spray coating processes. Where a patent claims both the coating process and an unconsolidated metal particle composition used in the process, the patent is classified in Class 427 and cross-referenced here.

428, Stock Material or Miscellaneous Articles,

403+, for a metal particle coated with a nonmetal, and subclass 570 for composite metal particles (e.g., a powder having one metal coated upon a different metal, etc.).