Cooperative Patent Classification


CPC Definition - Subclass B22F

Printable version [PDF]
Last Updated Version: 2017.08
WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (processes or devices for granulating materials in general B01J 2/00; making ceramics by compacting or sintering C04B, e.g. C04B 35/64; for the production of metals as such, see class C22; reduction or decomposition of metal compounds in general C22B; making alloys by powder metallurgy C22C; electrolytic production of metal powder C25C 5/00)
Definition statement

This place covers:

Special treatment of metallic powder, e.g. thermal, thermo-mechanical or chemical treatments, making agglomerates, mixing with lubricants or binders;

Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering or by the special shape of the product;

Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting;

Manufacture of articles from scrap or waste metal particles;

Making metallic powder or suspensions thereof using physical or chemical processes;

Powder metallurgical apparatus or equipment specifically adapted therefor, e.g. furnaces, retorts, sintering apparatus;

Metallic powders, per se, e.g. powder, mixture of powders or a mixture of a powder with a lubricating or binding agent

Relationships with other classification places

B22F covers the making of metallic powder including a metal powder with specific physical characteristics. When the metal is present only as impurity, or when the subject matter does not refer to the manufacturing process itself but only refers to the use of it (e.g. dental implants using metal powder are classified in A61C 8/00), it is classified in the other places of IPC.

C22B 1/14 covers preliminary treatment of ores or scrap with organic or inorganic binders, e.g., agglomerating; briquetting, granulating; sintering.

C22C 1/05; C22C 1/10; C22C 33/02; C22C 47/14 cover the making of alloys by powder metallurgy using mixtures of metal powder with non-metallic powder, fibres or filaments.

C22F covers changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working, including special physical methods, e.g. treatment with neutrons.

C04B covers preparing or treating powders of inorganic compounds in preparation to the manufacturing of ceramic products, e.g., C04B 35/622. When the proportion of metal powder is present not like as impurity in the compounds, it is classified at B22F.

C08K covers use of inorganic or non-macromolecular organic substances as compounding ingredients, including metals as inorganic ingredient, e.g., C08K 5/56 organic compounds containing a metal-to-carbon bond. These compounds are not considered metal per se.

B01J 2/00 covers chemical or physical processes or devices for granulating materials in general.

B02C covers crushing, grinding or milling in general

References
Limiting references

This place does not cover:

Non-ferrous alloys compositions made by powder metallurgy

Making alloys from mixtures of metal powder with non-metallic powder

Alloys based on metal compounds

Non-ferrous alloys containing other metal compounds

Making ferrous alloys by powder metallurgy

Making alloys containing metallic or non-metallic fibres or filaments by powder metallurgy

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Making ceramics by compacting or sintering

Shaped ceramic products characterised by their composition

Burning or sintering process for ceramic compositions

Production or refining of metals; Pretreatment of raw materials

Sintering; Agglomerating for ores or scrap

Electrolytic production, recovery of refining of metal powder or metal masses

Informative references

Attention is drawn to the following places, which may be of interest for search:

Dental implants

Prostheses implantable into the body

Use of preparations for artificial teeth, for filling or for capping teeth

Materials for prostheses or for coating prostheses

Chemical or physical processes or devices for granulating materials in general

Catalysts comprising metals

Methods for preparing or activation of catalysts

Crushing, grinding or milling in general

Disposal of solid waste

Mechanical metal-working

Metal parts in the mould of a casting process

Soldering or unsoldering; Welding; Cladding or plating by soldering or welding

Abrasive tools

Cutting tools

Presses specially adapted for forming articles from material in particulate or plastic state

Layered products characterised by features of a layer formed of particles, e.g. chips, chopped fibres, powder

Printing

Chemical aspects of powdering or granulating of macromolecular substances

Metallic pigments or fillers

Compressing powdered coating material, e.g. by milling

Drilling tools

Parts of bearings; Use of special materials or surface treatments, e.g. for rust-proofing

Conductive material dispersed in non-conductive organic material

Magnets or magnetic bodies characterised by the magnetic materials therefore; Selection of materials for their magnetic properties in the form of particles, e.g. powder

Selection of the material for the legs of the junction comprising metals only

Elements or alloys used in electrodes

Printed circuits

Special rules of classification

in B22F EC codes are also used for deep-indexing in combination with Indexing Code. Combination of codes are made to address supplementary information concerning processes or compositions, process sequences or information linked to processes or compositions. Each of these combinations start with a specific Indexing Code:

B22F 2998/00: supplementary information concerning processes or compositions relating to powder metallugy

B22F 2998/10: processes characterised by the sequence of their steps

B22F 2999/00: aspects linked to processes or compositions used in powder metallurgy

Examples (see e.g. US2005281701):

B22F 2998/00,B22F 1/0014: in §36-39 additional information is given on an embodiment having a bimodal size distribution;

B22F 2998/10,B22F 1/0059,B22F 3/004,B22F 3/093,B22F 3/02: from figure 4 it can be learned that a mould is filled with a mixture of metal powder and resin, vibration compacted and pressed

B22F 2999/00,B22F 3/004,B22F 3/093,B22F 2201/20: during the moulding and vibration compaction a vacuum is applied

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Compacting

join or press firmly together.

Metallic powder

covers powders which in addition to metals may contain a substantial proportion of non-metallic material.

Powder

includes particulate material of any geometrical shape, e.g. fibres, spheres, cubes, which are worked, obtained or behave in a manner similar to powder

Sintering

coalesce or cause to coalesce from powder into solid by heating.

Alloy

a composition of plural elements at least one of which is a free metal. Also includes material containing any combination of fibres, filaments, whiskers and particles, e.g. carbides, diamond, oxides, borides, nitrides or sulfides, embedded in a metallic matrix.

Furnace

covers kilns, ovens or retorts

Synonyms and Keywords

In patent documents the following words “apparatus”, “equipment” and “device” are often used as synonyms.

In patent documents the following keywords “residue”, “waste”, “remains”, “scrap”, “rejects” and “shred” are often used.

In patent documents the following keywords “compacting” and “compressing” are often used.

Special treatment of metallic powder, e.g. to facilitate working, to improve properties {(treatment of powder by mechanical means, e.g. by grinding, milling, rolling B22F 9/04)}; Metallic powders per se, e.g. mixtures of particles of different composition (C04, C08 take precedence; {amorphous powder B22F 9/002})
Definition statement

This place covers:

Metal particles per se as well as mixtures of metal particles with a lubricant, binding agent or organic material. Particles per se can have a specific size, size distribution, shape or structure. Treatment of metallic powder and coating thereof is also covered.

A special case, which is also covered by this subclass, concerns non-metallic or inorganic particles which have a metallic coating. Equally metal particles coated with non-metals or inorganic compounds are classified in subclass B22F 1/00. B22F 1/00 also covers powders containing a substantial proportion of non-metallic material. When the metal is present in a proportion significantly relevant so that it could not be seen as an impurity in the metallurgic process it must be classified in B22F 1/00.

Relationships with other classification places

Compositions of metal and ceramic powder, e.g. cermets, are classified in C22C.

References
Limiting references

This place does not cover:

Treatment of powder by mechanical means

Informative references

Attention is drawn to the following places, which may be of interest for search:

Shot peening

Ammunition shot

Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor{; Presses and furnaces}
Definition statement

This place covers:

Apart from the manufacturing of workpieces or articles from metallic powder, also the manufacturing of parts which are based on metallic fibres only (no matrix material) as well as processes starting from decomposable or reducible metal compounds.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Mechanical metal-working without essentially removing material; Punching metal

Forging; Hammering; Pressing; Forge Furnaces

Making forged or pressed products

Presses in general

Furnaces, Kilns, Ovens, or retorts in general; Open sintering or like apparatus

Special rules of classification

Although B22F 3/12 specifies processes including both compacting and sintering, this group is mainly used for information concerning the container or model used during the compacting and sintering. For the compacting and sintering step, the more detailed subgroups under B22F 3/02 (compacting) and/or B22F 3/10 (sintering) are applied.

Press-moulding apparatus therefor
Definition statement

This place covers:

Press apparatuses specially adapted for metal powder pressing.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Presses in general

Special rules of classification

Methods or special apparatuses for the filling of the moulds with powder are classified in B22F 3/003.

by explosive forces {(generating shock waves in general G10K 15/043)}
Definition statement

This place covers:

Processes in which compacting is accomplished through the use of shock waves or explosive forces, including processes that utilize a time-related detonating effect

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Application of shock-waves for chemical reactions or for modifying structures in general

Generating shock-waves in general

Special rules of classification
using vibrations {or friction}
Definition statement

This place covers:

Compaction aided by vibrations or friction.

by using electric current {other than for infra-red radiant energy}, laser radiation or plasma (B22F 3/11 takes precedence){; by ultrasonic bonding (B22F 3/115 takes precedence)}
Definition statement

This place covers:

All sintering processes involving EM-wave energy: electric current, plasma, laser, microwave, etc and ultra-sonic bonding.

References
Limiting references

This place does not cover:

Selective sintering processes, e.g. stereolithography

Stereolithographic techniques for making dental prostheses

Selective sintering of ceramic or cementitious material

Rapid manufacturing and prototyping of 3D objects by additive depositing, agglomerating or laminating of plastics material

Informative references

Attention is drawn to the following places, which may be of interest for search:

Laser welding and relative movement between laser beam and workpiece

Selective printing

by spraying molten metal, i.e. spray sintering, spray casting
Definition statement

This place covers:

(hot) spraying of molten metal wherein the sprayed material forms the product (i.e. not as a coating process).

References
Limiting references

This place does not cover:

Cold spraying of metal

Informative references

Attention is drawn to the following places, which may be of interest for search:

Adding compound dispersions to the spray

Thermal spraying fibre reinforced material

Special rules of classification

These documents are also classified in C23C 4/123 (spraying molten metal) and C23C 4/185 (separation of coating from substrate) as well as B22D 23/003 (moulding by spraying metal on a surface).

After-treatment of workpieces or articles {(B22F 3/1146 takes precedence)}
Definition statement

This place covers:

Chemical or thermal after-treatments and mechanical treatments only in as far as material is removed from the surface, such as making recesses or grooves, honing, polishing, milling, grinding, carving etc.

Special rules of classification

The after-treatment is further specified by means of an Indexing Code.

Impregnating {(making ferrous alloys by impregnation C22C 33/0242)}
References
Limiting references

This place does not cover:

Porous articles or workpieces formed by impregnation remaining porous

Informative references

Attention is drawn to the following places, which may be of interest for search:

Apparatus for impregnation

Impregnating a ceramic preform with molten metal

Non-ferrous alloys obtained by impregnation of a powder metallurgy product

Making ferrous alloys by impregnation

Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
Definition statement

This place covers:

Processes in which a defined geometrical configuration of a final product is specified, and also moulds, turbine components other than blades, engine parts different from piston rings, flat products and articles to be fractured or separated into parts.

of turbine blades
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Making turbine blades (by machining)from one piece from several pieces

Turbine blades

of threaded articles, e.g. nuts
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Making screw-threaded elements (e.g. nuts, bolts)

Screw bolts

of toothed articles, e.g. gear wheels; of cam discs
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Gear wheels by stamping

Gear wheels by rolling

Gear wheels forged or pressed

Coupling members, e.g. clutch systems

Making gears or toothed racks

Making gear wheels by "other" processes

Mechanically actuated clutches

Toothed gearings

Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting {wherein at least one part is obtained by sintering or compression (application of coating layers by use of metal powders, see C23C)}
Definition statement

This place covers:

Manufacture of composite parts (limited geometry) and layers ("infinite"), including porous layers or parts, comprising metallic powder, by sintering the powder, with or without compacting

References
Limiting references

This place does not cover:

Coatings applied by use of metal powder (not involving compression and/or sintering)

Informative references

Attention is drawn to the following places, which may be of interest for search:

Layered products characterised by the non-homogeneity or physical structure of a layer, comprising fibres or filaments formed of particles foamed or porous material combinations thereof in at least 2 layers

Layered products characterised by the relation between layers

Layered products, essential comprising metal

Methods or apparatus for laminating

of composite workpieces or articles from parts, e.g. to form tipped tools {(B22F 7/002 takes precedence)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Tools for cutting or boring with bits of special material or diamond bits

Connecting cutting edges by brazing

Making cutting tools

Tools for grinding, with metallic binder

Hand cutting tools

B26

Earth or rock drilling bits, with diamond insertswith button type inserts

{involving the connection or repairing of preformed parts}
Definition statement

This place covers:

Only connecting (i.e not co-forming or in-situ forming) or repairing.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Repairing methods or devices for turbine blades

Manufacture of articles from scrap or waste metal particles
Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Scrap, waste

swarf, residue, remains, rejects, shred

Making metallic powder or suspensions thereof
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Granulation of slag

Granulation of ores or scrap

{Rapid solidification processing}
Definition statement

This place covers:

Solidification by means of quenching rates above 104 C/s.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Processes or devices for granulating materials, in general

Metallic powder obtained by crushing, pulverising, disintegrating in general; milling grain

starting from liquid material
Definition statement

This place covers:

Only starting from melts.

starting from gaseous material
Definition statement

This place covers:

Processes employing a gaseous precursor of the powder, plasma, or the evaporation of metal.

using chemical processes
Definition statement

This place covers:

Including the recovery of one metal from a mixture/solution containing multiple metals.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

By hydrogen absorption / desorption

Electrolytic production, recovery or refining of metal powders

starting from solid metal compounds
Relationships with other classification places

Direct reduction of iron ores: C21B 13/00

General processes of reducing to metals: C22B 5/00

Dry reduction processes for obtaining specific non-ferrous metals: C22B

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Controlled atmosphere, or pulverulent material; Adjusting the composition of the atmosphere

{of metal carbonyls}
References
Limiting references

This place does not cover:

Manufacturing of iron from iron carbonyl

General method of reducing metals from metal carbonyls