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MINING OR QUARRYING
Definition statement
This subclass/group covers:

Methods or apparatus specific to mining or quarrying.

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 subclass/group 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 relevant to classification in this group
This subclass/group 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 subclass/group covers:

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

Informative references
Attention is drawn to the following places, which may be of interest for search:
Guiding the machine
Glossary of terms
In this subclass/group, 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 subclass/group 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 subclass/group 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 subclass/group 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 subclass/group 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 subclass/group 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
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 subclass/group covers:

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

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 within this group

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 subclass/group covers:

Techniques for dislodging minerals for mining applications.

References relevant to classification in this group
This subclass/group 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 relevant to classification in this group
This subclass/group 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) ; Lay-outs therefor (for peat E21C 49/00)
Definition statement
This subclass/group covers:

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

References relevant to classification in this group
This subclass/group does not cover:
Obtaining minerals through a borehole drilled from the surface
Machines for underground mining
Methods of hydraulic mining, hydraulic monitors
Machines for surface mining
Mining methods for obtaining peat
Methods of underwater mining
Methods of hydraulic mining; Hydraulic monitors (E21C 25/60 takes precedence)
Definition statement
This subclass/group 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 relevant to classification in this group
This subclass/group does not cover:
Slitting by jets of water
Synonyms and Keywords

In patent documents the following expresions/words "hydraulic mining", "hydraulic excavation"; "hydraulic extraction", "hydroextraction" and "hydrolicking" are often used as synonyms.

Machines for obtaining or the removal of materials in open-pit mines (obtaining peat E21C 49/00)
Definition statement
This subclass/group covers:

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

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References relevant to classification in this group
This subclass/group does not cover:
Surface transport of mined material
Methods of surface mining
Mining methods for obtaining peat
Obtaining peat; Machines therefor (treating peat C10F)
Definition statement
This subclass/group covers:

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

References relevant to classification in this group
This subclass/group 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 subclass/group covers:

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

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References relevant to classification in this group
This subclass/group 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)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Cosmonautics
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Last Modified: 10/11/2013