Cooperative Patent Classification


CPC Definition - Subclass E21C

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Last Updated Version: 2017.08
MINING OR QUARRYING
Definition statement

This place covers:

Methods or apparatus specific to mining or quarrying.

References
Informative references

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

Drill bits, bore reamers, core taking devices, drilling pipes or rods, handling, racking or connecting arrangements for drilling pipes or rods, counterboring or enlarging drilled holes, flame drilling, or other drilling apparatus, even though they may be disclosed only for mining or quarrying

Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam (dislodging machines with slitting means E21C 27/02, E21C 27/10, E21C 27/18)
Definition statement

This place covers:

Machines having cutting means for making a slit or a plurality of slits in the seam, so that the material in the seam can be removed in a subsequent step. Illustrative example:

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References
Limiting references

This place does not cover:

Dislodging machines with slitting means

Informative references

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

Guiding the machine

Machines which completely free the mineral from the seam
Definition statement

This place covers:

Machines that can break the mineral by any means that dislodge it completely from the seam.

References
Informative references

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

Guiding the machine

Glossary of terms

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

Planer

A fixed-blade device for continuous longwall mining of narrow seams of friable coal; the machine is operated along the coal face, planing a narrow cut from the solid coal as it travels.

solely by slitting (rods, drums, for same E21C 25/10; saws, discs, wheels E21C 25/18; chains, chain guides, for same E21C 25/28)
Definition statement

This place covers:

Machines which completely free the mineral from the seam solely by slitting; Shearer loaders. While E21C 25/00 is only for slitting, with the material remaining in place and needing to be removed by other means, in E21C 27/02 the material is slit and removed in one go. The machines of this groups have e.g. drums with spiral-shaped cutters for slitting and extracting the cut material. Illustrative example:

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by milling means acting on the full working face{, i.e. the rotary axis of the tool carrier being substantially parallel to the working face (similar machines for tunneling E21D 9/1026)}
Definition statement

This place covers:

Mineral freed by milling means acting on the full working face not involving slitting; Continuous miners. llustrative example:

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Machine propelled along the working face by cable or chain
Definition statement

This place covers:

Machine propelled along the working face by cable or chain; Coal ploughs. Illustrative example:

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Propulsion of machines for slitting or completely freeing the mineral from the seam
Definition statement

This place covers:

Propulsion of machines for slitting or completely freeing the mineral from the seam; Propulsion of machines along the seam. Illustrative example:

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Propulsion of machines into the seam, as in highwall mining. Illustrative example:

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Driving means incorporated in machines for slitting or completely freeing the mineral from the seam
Definition statement

This place covers:

Drive units for energising any of the parts forming the machine. Illustrative example:

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Trucks or other devices for transporting machines for slitting or completely freeing the mineral from the seam
References
Informative references

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

Equipment transport systems adapted to underground conditions

Miscellaneous items relating to machines for slitting or completely freeing the mineral from the seam
Definition statement

This place covers:

Specific details of mining machines not disclosed in E21C 25/00 - E21C 33/00.

References
Informative references

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

Picks for tearing up asphalt

Special rules of classification

Means for placing or orienting the machine are classified in E21D35/08 and subgroups. Inventions relative to obtaining information about the position or the status of the machine and processing that information to control the machine are classified in E21C 35/24. If the positioning is done in combination with operation of a shield for step-by-step movement, then this aspect is classified in E21D 23/00.

Other methods or devices for dislodging with or without loading (breaking-down by means inserted in slits E21C 27/14)
Definition statement

This place covers:

Techniques for dislodging minerals for mining applications.

References
Limiting references

This place does not cover:

Breaking-down by means inserted in slits

Informative references

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

Excavating tunnels by blasting methods

Rock blasting

Devices for testing in situ the hardness or other properties of minerals, e.g. for giving information as to the selection of suitable mining tools
References
Limiting references

This place does not cover:

Indicating devices for use during driving of tunnels

Rock pressure control devices

E21F17/18F

Methods of underground or surface mining (E21C 45/00 takes precedence); Layouts therefor (for peat E21C 49/00)
Definition statement

This place covers:

Methods disclosing sequences of steps or combinations of operations of mining.

References
Limiting references

This place does not cover:

Machines for underground mining

Methods of hydraulic mining, hydraulic monitors

Machines for surface mining

Mining methods for obtaining peat

Methods of underwater mining

Obtaining minerals through a borehole drilled from the surface

Methods of hydraulic mining; Hydraulic monitors (E21C 25/60 takes precedence)
Definition statement

This place covers:

Methods of hydraulic mining; Hydraulic monitors; Excavating alluvial or other mineral deposits by means of high-pressure water jets. Illustrative example:

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References
Limiting references

This place does not cover:

Slitting by jets of water

Synonyms and Keywords

In patent documents, the following words/expressions are often used as synonyms:

  • "hydraulic mining", "hydraulic excavation"; "hydraulic extraction", "hydroextraction" and "hydrolicking"
Machines for obtaining or the removal of materials in open-pit mines (obtaining peat E21C 49/00)
Definition statement

This place covers:

Machines for obtaining or the removal of materials in open-pit mines. Illustrative example:

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References
Limiting references

This place does not cover:

Methods of surface mining

Mining methods for obtaining peat

Surface transport of mined material

Obtaining peat; Machines therefor (treating peat C10F)
Definition statement

This place covers:

Methods and machinery for draining and preparing the peat deposit before exploitation, as well as for the extraction of peat.

References
Limiting references

This place does not cover:

Treating peat

Obtaining minerals from underwater, not otherwise provided for (suction dredgers or component parts thereof E02F 3/88; equipment for conveying or separating excavated material E02F 7/00; dippers G01N 1/12)
Definition statement

This place covers:

Methods and machinery for obtaining minerals from sea bodies, such as ocean floors, or lake or river beds.

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References
Limiting references

This place does not cover:

Suction dredgers or component parts thereof

Equipment for conveying or separating excavated material

Dippers

Apparatus for, or methods of, winning materials from extraterrestrial sources (cosmonautics B64G)
References
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Attention is drawn to the following places, which may be of interest for search:

Cosmonautics