E21B
`
`CPC
`
`COOPERATIVE PATENT CLASSIFICATION
`
`E
`
`FIXED CONSTRUCTIONS
`
`EARTH DRILLING; MINING
`
`E21
`
`EARTH DRILLING; MINING
`
`E21B
`
`EARTH DRILLING, e.g. DEEP DRILLING (mining, quarrying E21C; making shafts, driving
`galleries or tunnels E21D); OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE
`MATERIALS OR A SLURRY OF MINERALS FROM WELLS
`WARNINGS
`
`1. The following IPC groups are not in the CPC scheme. The subject matter for these IPC groups is classified in the following
`CPC groups:
`E21B 7/06
`covered by
`E21B 7/08
`C09K 8/58
`covered by
`E21B 43/22
`2. In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the
`scheme.
`
`Methods or apparatus for drilling
`
`1/00
`
`Percussion drilling (drives used in the borehole
`E21B 4/00)
`
`NOTE
`
`When classifying in groups
`E21B 1/12 - E21B 1/38, a symbol from one of the
`following main groups of B25D should also be
`given:
`• B25D 9/00 Portable percussive tools with fluid-
`pressure drives
`• B25D 11/00 Portable percussive tools with
`motor drive
`• B25D 16/00 Portable percussive machines with
`superimposed rotation
`• B25D 17/00 Details of, or accessories for,
`portable power-driven percussive tools
`
`WARNING
`
`Group E21B 1/00 is impacted by reclassification
`into groups E21B 1/12, E21B 1/14, E21B 1/16,
`E21B 1/18, E21B 1/20, E21B 1/22, E21B 1/24,
`E21B 1/26, E21B 1/28, E21B 1/30, E21B 1/32,
`E21B 1/34, E21B 1/36, and E21B 1/38.
`All groups listed in this Warning should be
`considered in order to perform a complete search.
`
`1/02
`
`. Surface drives for drop hammers {or percussion
`drilling}, e.g. with a cable
`
`WARNING
`
`Group E21B 1/02 is incomplete pending
`reclassification of documents from group
`E21B 1/12.
`Group E21B 1/02 is also impacted by
`reclassification into groups E21B 1/04,
`E21B 1/36 and E21B 1/38.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`CPC - 2021.02
`
`1/04
`
`.
`
`. Devices for reversing the movement of the rod or
`cable at the surface
`
`WARNING
`
`Group E21B 1/04 is incomplete pending
`reclassification of documents from groups
`E21B 1/02 and E21B 1/12.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`1/12
`
`. with a reciprocating impulse member (E21B 1/02,
`E21B 1/38 take precedence)
`
`WARNING
`
`Group E21B 1/12 is incomplete pending
`reclassification of documents from group
`E21B 1/00.
`Group E21B 1/12 is also impacted by
`reclassification into groups E21B 1/02,
`E21B 1/04, E21B 1/14, E21B 1/16, E21B 1/18,
`E21B 1/20, E21B 1/22, E21B 1/24, E21B 1/26,
`E21B 1/28, E21B 1/30, E21B 1/32, E21B 1/34
`and E21B 1/38.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`1/14
`
`.
`
`. driven by a rotating mechanism
`WARNING
`
`Groups E21B 1/14 - E21B 1/20 are incomplete
`pending reclassification of documents from
`groups E21B 1/00 and E21B 1/12.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`1/16
`
`1/18
`
`.
`
`.
`
`.
`
`.
`
`. with spring-mounted reciprocating masses, e.g.
`with air cushion
`. with elastic joining of the drive to the push-
`rod by double buffer springs
`
`.
`
`1
`
`GHD
`1011
`
`Page 1 of 25 (PGR2021-00078)
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`
`

`

`Methods or apparatus for drilling
`
`E21B
`
` 1/20
` 1/22
`
`.
`.
`
`.
`.
`formed as centrifugal hammers
`. driven by electromagnets
`WARNING
`
`Group E21B 1/22 is incomplete pending
`reclassification of documents from groups
`E21B 1/00 and E21B 1/12.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`
`
` 1/24
`
`.
`
`.
`
`the impulse member being a piston driven directly
`by fluid pressure
`
`WARNING
`
`Groups E21B 1/24 - E21B 1/34 are incomplete
`pending reclassification of documents from
`groups E21B 1/00 and E21B 1/12.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`
`
` 1/26
` 1/28
` 1/30
` 1/32
` 1/34
`
` 1/36
`
`.
`.
`.
`.
`.
`
`.
`.
`.
`.
`.
`
`. by liquid pressure
`.
`. working with pulses
`. by air, steam or gas pressure
`.
`. working with pulses
`.
`.
`.
`the impulse member being a piston of an
`internal-combustion engine
`. Tool-carrier piston type, i.e. in which the tool is
`connected to an impulse member
`
`WARNING
`
`Group E21B 1/36 is incomplete pending
`reclassification of documents from groups
`E21B 1/00, E21B 1/02 and E21B 1/12.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`
`
` 1/38
`
`. Hammer piston type, i.e. in which the tool bit or
`anvil is hit by an impulse member
`
`WARNING
`
`Group E21B 1/38 is incomplete pending
`reclassification of documents from groups
`E21B 1/00, E21B 1/02 and E21B 1/12.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`
`
` 3/00 Rotary drilling (drives used in the borehole
`E21B 4/00; rotary drilling machines in general B23B)
`
`WARNING
`
`Group E21B 3/00 is impacted by reclassification
`into groups E21B 3/02, E21B 3/022, E21B 3/025,
`E21B 3/03, E21B 3/035, E21B 3/04, E21B 3/045,
`and E21B 3/06.
`All groups listed in this Warning should be
`considered in order to perform a complete search.
`
`
`
` 3/02
`
`. Surface drives for rotary drilling
`WARNING
`
`
`
`Group E21B 3/02 is incomplete pending
`reclassification of documents from group
`E21B 3/00.
`Group E21B 3/02 is also impacted by
`reclassification into group E21B 3/022.
`Groups E21B 3/00, E21B 3/02, and E21B 3/022
`should be considered in order to perform a
`complete search.
`
`
`
` 3/022
`
`.
`
`. {Top drives}
`WARNING
`
`Group E21B 3/022 is incomplete pending
`reclassification of documents from groups
`E21B 3/00 and E21B 3/02.
`Groups E21B 3/00, E21B 3/02, and
`E21B 3/022 should be considered in order to
`perform a complete search.
`
`
`
` 3/025
`
`.
`
`. with a to-and-fro rotation of the tool
`WARNING
`
`Group E21B 3/025 is incomplete pending
`reclassification of documents from group
`E21B 3/00.
`Groups E21B 3/00 and E21B 3/025 should
`be considered in order to perform a complete
`search.
`
`
`
` 3/03
`
`.
`
`. with an intermittent unidirectional rotation of the
`tool
`
`WARNING
`
`Group E21B 3/03 is incomplete pending
`reclassification of documents from group
`E21B 3/00.
`Groups E21B 3/00 and E21B 3/03 should be
`considered in order to perform a complete
`search.
`
`
`
` 3/035
`
`.
`
`. with slipping or elastic transmission
`WARNING
`
`Group E21B 3/035 is incomplete pending
`reclassification of documents from group
`E21B 3/00.
`Groups E21B 3/00 and E21B 3/035 should
`be considered in order to perform a complete
`search.
`
`
`
` 3/04
`
`.
`
`. Rotary tables {(portable drilling rigs with rotary
`tables E21B 7/021)}
`
`WARNING
`
`Groups E21B 3/04 – E21B 3/06 are
`incomplete pending reclassification of
`documents from group E21B 3/00.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`
`
` 3/045
`
`.
`
`.
`
`. {movably mounted on the drilling structure or
`platform (derricks adapted to be moved on their
`substructure E21B 15/003)}
`
`CPC - 2021.02
`
`2
`
`Page 2 of 25 (PGR2021-00078)
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`

`

`Methods or apparatus for drilling
`
`E21B
`
` 3/06
`
`.
`
`.
`
`. Adaptation of rotary draw works to drive rotary
`tables (connecting or disconnecting couplings
`or joints E21B 19/16; rope, cable, or chain
`winding mechanisms, capstans B66D)
`
` 4/006
`
` 4/02
`
` 4/04
` 4/06
`
` 4/00 Drives for drilling, used in the borehole
`. {Bearing, sealing, lubricating details (for roller bits
` 4/003
`E21B 10/22)}
`. {Mechanical motion converting means, e.g.
`reduction gearings (E21B 4/10 takes precedence)}
`. Fluid rotary type drives (hydraulic turbines for
`drilling wells F03B 13/02)
`. Electric drives (E21B 4/12 takes precedence)
`. Down-hole impacting means, e.g. hammers
`(percussion drill bits E21B 10/36; boring rams
`E21B 11/02; releasing-jars E21B 31/107)
`.
`impact being obtained by gravity only, e.g. with
`lost-motion connection
`. continuous unidirectional rotary motion of shaft
`or drilling pipe effecting consecutive impacts
`. Electrically operated hammers
`. Fluid operated hammers
`.
`. {of the self propelled-type, e.g. with a reverse
`mode to retract the device from the hole}
`. Plural down-hole drives, e.g. for combined
`percussion and rotary drilling (E21B 4/10 takes
`precedence); Drives for multi-bit drilling units
`. Anchoring or feeding in the borehole
`. combined with surface drive (E21B 4/10 takes
`precedence)
`
`.
`
`.
`
`.
`.
`.
`
` 4/08
`
` 4/10
`
` 4/12
` 4/14
` 4/145
`
` 4/16
`
` 4/18
` 4/20
`
` 6/00 Drives for drilling with combined rotary and
`percussive action (drives used in the borehole
`E21B 4/00; portable percussive machines with
`superimposed rotation B25D 16/00)
`.
`the rotation being continuous
`.
`. Separate drives for percussion and rotation
`.
`the rotation being intermittent, e.g. obtained by
`ratchet device
`. Separate drives for percussion and rotation
`
` 6/08
`
`.
`
` 6/02
` 6/04
` 6/06
`
` 7/002
`
` 7/00 Special methods or apparatus for drilling
`. {Drilling a non circular hole (excavating
` 7/001
`trenches E02F 5/02; cutting machines for slitting
`E21C 25/00)}
`. {Drilling with diversely driven shafts extending into
`the borehole (simultaneously drilling and casing
`E21B 7/20; plural down-hole drives E21B 4/16;
`E21B 7/001 takes precedence)}
`. {Drilling with mechanical conveying means
`(tunnelling E21D)}
`. {with helical conveying means (E21B 7/201 takes
`precedence; augers E21B 10/44; drilling rods or
`pipes with helical structure E21B 17/22)}
`. {combined with a bucket-type container}
`.
`.
`. {Drilling by use of explosives (underwater drilling
`using explosives E21B 7/1245)}
`. {Drilling ice or a formation covered by ice}
`. Drilling rigs characterized by means for land
`transport {with their own drive}, e.g. skid mounting
`or wheel mounting (portable drilling rigs for use on
`underwater floors E21B 7/124)
`. {With a rotary table, i.e. a fixed rotary drive for a
`relatively advancing tool}
`
` 7/003
`
` 7/005
`
`.
`
` 7/006
` 7/007
`
` 7/008
` 7/02
`
` 7/021
`
`.
`
` 7/022
`
` 7/023
`
` 7/024
`
` 7/025
` 7/026
`
` 7/027
`
` 7/028
`
`.
`
`.
`
`.
`
`.
`.
`
`.
`
`.
`
`. {Control of the drilling operation; Hydraulic
`or pneumatic means for activation or operation
`(control circuits for drilling masts E21B 15/045)}
`. {the mast being foldable or telescopically
`retractable}
`. {having means for adapting to inclined terrain;
`having means for stabilizing the vehicle while
`drilling}
`. {Rock drills, i.e. jumbo drills}
`. {having auxiliary platforms, e.g. for observation
`purposes}
`. {Drills for drilling shallow holes, e.g. for taking
`soil samples or for drilling postholes}
`. {the drilling apparatus being detachable from
`the vehicle, e.g. hand portable drills}
`
`.
`
`WARNING
`
`Group E21B 7/028 is incomplete pending
`reclassification of documents from group
`E21B 11/005.
`Groups E21B 11/005 and E21B 7/028
`should be considered in order to perform a
`complete search.
`
`
`
` 7/04
`
` 7/043
` 7/046
`
` 7/06
` 7/061
`
` 7/062
`
` 7/064
` 7/065
` 7/067
`
` 7/068
`
` 7/10
` 7/12
`
` 7/122
` 7/124
`
` 7/1245
`
` 7/128
`
` 7/132
` 7/136
`
` 7/14
` 7/143
` 7/146
` 7/15
`
`.
`.
`
`.
`.
`
`.
`
`.
`.
`.
`
`.
`
`.
`.
`
`.
`
`.
`
`.
`.
`
`. Directional drilling {(derricks or masts specially
`adapted therefor E21B 15/04)}
`. {for underwater installations}
`. {horizontal drilling (drilling with mechanical
`conveying means E21B 7/003)}
`. Deflecting the direction of boreholes
`.
`. {the tool shaft advancing relative to a guide,
`e.g. a curved tube or a whipstock}
`. {the tool shaft rotating inside a non-rotating
`guide travelling with the shaft (E21B 7/067 and
`E21B 7/068 take precedence)}
`. {specially adapted drill bits therefor}
`. {using oriented fluid jets}
`. {with means for locking sections of a pipe or
`of a guide for a shaft in angular relation, e.g.
`adjustable bent sub}
`. {drilled by a down-hole drilling motor (down-
`hole drives per se E21B 4/00, E21B 7/067 takes
`precedence)}
`. Correction of deflected boreholes
`.
`. Underwater drilling ({derricks or masts specially
`adapted therefor E21B 15/02;} telescoping
`joints E21B 17/07; using heave compensators
`E21B 19/09; well heads specially adapted for
`underwater installations E21B 33/035)
`. {with submersible vertically movable guide}
`. with underwater tool drive prime mover, e.g.
`portable drilling rigs for use on underwater floors
`. {using explosive means (anchors driven in by
`explosive charges B63B 21/28)}
`from floating support with independent
`underwater anchored guide base
`from underwater buoyant support
`from non-buoyant support (E21B 7/124 takes
`precedence)
`. Drilling by use of heat, e.g. flame drilling
`.
`. {underwater}
`.
`. {Thermal lances}
`.
`. of electrically generated heat
`
`.
`
`.
`.
`.
`
`.
`
`.
`
`.
`
`.
`.
`
`CPC - 2021.02
`
`3
`
`Page 3 of 25 (PGR2021-00078)
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`
`

`

`Methods or apparatus for drilling
`
`E21B
`
` 7/16
`
` 7/18
`
` 7/185
` 7/20
`
` 7/201
` 7/203
` 7/205
`
` 7/206
` 7/208
`
` 7/24
`
` 7/26
`
`. Applying separate balls or pellets by the pressure of
`the drill, so-called shot-drilling
`. Drilling by liquid or gas jets, with or without
`entrained pellets (E21B 7/14 takes precedence;
`hydraulic monitors E21C 45/00)
`. {underwater}
`.
`. Driving or forcing casings or pipes into boreholes,
`e.g. sinking; Simultaneously drilling and casing
`boreholes (surface means for applying to-and-fro
`rotation movements to the casing E21B 3/025;
`placing piles E02D 7/00; sinking shafts while
`moving the lining downwards E21D 1/08 {; making
`galleries by forcing prefabricated elements through
`the ground E21D 9/005})
`. {with helical conveying means}
`.
`. {using down-hole drives}
`. {without earth removal (E21B 7/30 takes
`precedence)}
`
`.
`.
`.
`
`NOTE
`
`Special methods or apparatus for drilling
`without earth removal E21B 7/26
`
`.
`.
`
`. {using down-hole drives}
`.
`. {using down-hole drives (E21B 7/203 and
`E21B 7/206 take precedence)}
`. Drilling using vibrating or oscillating means,
`e.g. out-of-balance masses (percussion drilling
`E21B 1/00)
`. Drilling without earth removal, e.g. with self-
`propelled burrowing devices (E21B 7/30 takes
`precedence; down-hole drives E21B 4/00 {,
`e.g. self-propelled fluid-operated hammers
`E21B 4/145})
`
`WARNING
`
`
`
`Group E21B 7/26 is impacted by reclassification
`into group E21B 7/267.
`Groups E21B 7/26 and E21B 7/267 should
`be considered in order to perform a complete
`search.
`
` 7/265
`
`.
`
`. {Combined with earth removal}
`WARNING
`
`
`
`Group E21B 7/265 is impacted by
`reclassification into group E21B 7/267.
`Groups E21B 7/265 and E21B 7/267 should
`be considered in order to perform a complete
`search.
`
` 7/267
`
`.
`
`. {Drilling devices with senders, e.g. radio-
`transmitters for position of drilling tool}
`
`WARNING
`
`Group E21B 7/267 is incomplete pending
`reclassification of documents from groups
`E21B 7/26 and E21B 7/265.
`Groups E21B 7/26, E21B 7/265, and
`E21B 7/267 should be considered in order to
`perform a complete search.
`
`
`
` 7/28
`
` 7/30
`
`. Enlarging drilled holes, e.g. by counterboring (drill
`bits for enlarging the borehole E21B 10/26)
`. without earth removal
`
`.
`
`Drilling tools
`
` 10/003
`
` 10/006
`
` 10/02
`
` 10/04
` 10/06
` 10/08
`
` 10/083
`
`.
`
` 10/00 Drill bits (specially adapted for deflecting the
`direction of boring E21B 7/064; with means for
`collecting substances E21B 27/00)
`. {with cutting edges facing in opposite axial
`directions}
`. {providing a cutting edge which is self-renewable
`during drilling}
`. Core bits (characterised by wear resisting
`parts E21B 10/46; obtaining undisturbed cores
`E21B 25/00)
`. with core destroying means
`.
`. Roller core bits
`.
`. Roller bits (roller core bits E21B 10/06; with
`leading portion E21B 10/26; characterised by wear
`resisting parts E21B 10/46)
`. {with longitudinal axis, e.g. wobbling or nutating
`roller bit (longitudinal axis roller reamers
`E21B 10/30)}
`. {with excentric movement}
`. with roller axle supported at both ends (with disc-
`cutters E21B 10/12)
`. with discs cutters
`. combined with non-rolling cutters other than of
`leading-portion type
`. characterised by tooth form or arrangement
`. characterised by conduits or nozzles for drilling
`fluids (drilling fluid supply to the bearings
`E21B 10/23)
`. characterised by detachable or adjustable
`parts, e.g. legs or axles (cross axle roller bits
`E21B 10/10)
`. characterised by bearing, lubrication or sealing
`details
`. with drilling fluid supply to the bearings
`.
`.
`. characterised by lubricating details
`.
`.
`.
`. {with pumping means for feeding lubricant}
`.
`.
`. characterised by sealing details
`.
`.
`. Drill bits with leading portion, i.e. drill bits with a
`pilot cutter; Drill bits for enlarging the borehole,
`e.g. reamers (percussion drill bits with leading
`portion E21B 10/40; augers with leading portion
`E21B 10/44)
`
`.
`.
`
`.
`.
`
`.
`.
`
`.
`
`.
`
` 10/086
` 10/10
`
` 10/12
` 10/14
`
` 10/16
` 10/18
`
` 10/20
`
` 10/22
`
` 10/23
` 10/24
` 10/246
` 10/25
` 10/26
`
`WARNING
`
`
`
`Group E21B 10/26 is impacted by
`reclassification into group E21B 10/265.
`Groups E21B 10/26 and E21B 10/265 should
`be considered in order to perform a complete
`search.
`
` 10/265
`
`.
`
`. {Bi-center drill bits, i.e. an integral bit and
`eccentric reamer used to simultaneously drill and
`underream the hole}
`
`WARNING
`
`Group E21B 10/265 is incomplete pending
`reclassification of documents from groups
`E21B 10/26, E21B 10/28, E21B 10/30,
`E21B 10/32, E21B 10/322, E21B 10/325,
`E21B 10/327, E21B 10/34, and E21B 10/345.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`
`
`CPC - 2021.02
`
`4
`
`Page 4 of 25 (PGR2021-00078)
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`

`

`Drilling tools
`
`E21B
`
` 10/28
`
`.
`
`. with non-expansible roller cutters
`WARNING
`
` 10/345
`
`.
`
`.
`
`.
`
`. {cutter shifted by fluid pressure}
`WARNING
`
` 10/36
`
` 10/38
`
` 10/40
` 10/42
`
`
`
`Group E21B 10/345 is impacted by
`reclassification into group E21B 10/265.
`Groups E21B 10/345 and E21B 10/265
`should be considered in order to perform
`a complete search.
`
`.
`
`. Percussion drill bits ({with helical conveying
`portion E21B 10/445;} characterised by wear
`resisting parts E21B 10/46)
`. characterised by conduits or nozzles for drilling
`fluids
`. with leading portion
`.
`. Rotary drag type drill bits with teeth, blades or
`like cutting elements, e.g. fork-type bits, fish
`tail bits (characterised by wear resisting parts
`{E21B 10/54}; by conduits or nozzles for drilling
`fluid E21B 10/60; by detachable or adjustable parts
`E21B 10/62)
`
`WARNING
`
`Group E21B 10/42 is impacted by
`reclassification into groups E21B 10/62,
`E21B 10/627, and E21B 10/633.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`
`
` 10/43
`
`.
`
`. characterised by the arrangement of teeth or other
`cutting elements
`
`WARNING
`
`Group E21B 10/43 is impacted by
`reclassification into groups E21B 10/62,
`E21B 10/627, and E21B 10/633.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`
`
`
`
`Group E21B 10/28 is impacted by
`reclassification into group E21B 10/265.
`Groups E21B 10/28 and E21B 10/265 should
`be considered in order to perform a complete
`search.
`
` 10/30
`
`.
`
`.
`
`. Longitudinal axis roller reamers, e.g. reamer
`stabilisers
`
`WARNING
`
`
`
`Group E21B 10/30 is impacted by
`reclassification into group E21B 10/265.
`Groups E21B 10/30 and E21B 10/265
`should be considered in order to perform a
`complete search.
`
` 10/32
`
`.
`
`. with expansible cutting tools
`WARNING
`
`
`
`Group E21B 10/32 is impacted by
`reclassification into group E21B 10/265.
`Groups E21B 10/32 and E21B 10/265 should
`be considered in order to perform a complete
`search.
`
` 10/322
`
`.
`
`.
`
`. {cutter shifted by fluid pressure (E21B 10/345
`takes precedence)}
`
`WARNING
`
`
`
`Group E21B 10/322 is impacted by
`reclassification into group E21B 10/265.
`Groups E21B 10/322 and E21B 10/265
`should be considered in order to perform a
`complete search.
`
` 10/325
`
`.
`
`.
`
`. {the cutter being shifted by a spring
`mechanism}
`
`WARNING
`
`
`
`Group E21B 10/325 is impacted by
`reclassification into group E21B 10/265.
`Groups E21B 10/325 and E21B 10/265
`should be considered in order to perform a
`complete search.
`
` 10/327
`
`.
`
`.
`
`. {the cutter being pivoted about a longitudinal
`axis (E21B 10/34 takes precedence)}
`
`WARNING
`
`
`
`Group E21B 10/327 is impacted by
`reclassification into group E21B 10/265.
`Groups E21B 10/327 and E21B 10/265
`should be considered in order to perform a
`complete search.
`
` 10/34
`
`.
`
`.
`
`. of roller-cutter type
`WARNING
`
`
`
`Group E21B 10/34 is impacted by
`reclassification into group E21B 10/265.
`Groups E21B 10/34 and E21B 10/265
`should be considered in order to perform a
`complete search.
`
` 10/44
`
` 10/445
` 10/46
`
` 10/48
` 10/485
`
` 10/50
` 10/52
` 10/54
`
` 10/55
`
` 10/56
`
`. Bits with helical conveying portion, e.g. screw type
`bits; Augers with leading portion or with detachable
`parts (E21B 10/42 takes precedence; drilling rods
`with helical structure E21B 17/22)
`. {percussion type, e.g. for masonry}
`.
`. characterised by wear resisting parts, e.g. diamond
`inserts
`.
`the bit being of core type
`.
`. {with inserts in form of chisels, blades or the
`like}
`the bit being of roller type
`. with chisel- or button-type inserts
`the bit being of the rotary drag type, e.g. fork-type
`bits
`. with preformed cutting elements (inserts per se
`E21B 10/56, E21B 10/58)
`. Button-type inserts (E21B 10/52 takes
`precedence)
`
`.
`.
`
`.
`.
`.
`
`.
`
`.
`
`.
`.
`.
`
`.
`
`CPC - 2021.02
`
`5
`
`Page 5 of 25 (PGR2021-00078)
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`

`

`Drilling tools
`
`E21B
`
` 10/567
`
`.
`
`.
`
`. with preformed cutting elements mounted on a
`distinct support, e.g. polycrystalline inserts
`
` 10/66
`
`.
`
`.
`
`the cutting element movable through the drilling
`pipe and laterally shiftable
`
`WARNING
`
`
`
`Group E21B 10/567 is impacted by
`reclassification into group E21B 10/5671.
`Groups E21B 10/567 and E21B 10/5671
`should be considered in order to perform a
`complete search.
`
` 11/00 Other drilling tools
`
`WARNING
`
`Group E21B 11/00 is impacted by reclassification
`into group E21B 11/04.
`Groups E21B 11/00 and E21B 11/04 should be
`considered in order to perform a complete search.
`
`
`
` 10/5671
`
`.
`
`.
`
`.
`
`. {with chip breaking arrangements}
`WARNING
`
` 11/005
`
`. {Hand operated drilling tools (hand portable tools
`detachable from portable drilling rigs E21B 7/028)}
`
`Group E21B 10/5671 is incomplete
`pending reclassification of documents
`from groups E21B 10/567 and
`E21B 10/5673.
`Groups E21B 10/567, E21B 10/5673, and
`E21B 10/5671 should be considered in
`order to perform a complete search.
`
`
`
`WARNING
`
`
`
`Group E21B 11/005 is impacted by
`reclassification into group E21B 7/028.
`Groups E21B 11/005 and E21B 7/028 should
`be considered in order to perform a complete
`search.
`
` 10/5673
`
`.
`
`.
`
`.
`
`. {having a non planar or non circular cutting
`face}
`
`WARNING
`
`
`
`Group E21B 10/5673 is impacted by
`reclassification into group E21B 10/5671.
`Groups E21B 10/5673 and E21B 10/5671
`should be considered in order to perform
`a complete search.
`
` 10/5676
`
` 10/573
`
` 10/5735
`
` 10/58
`
` 10/60
`
` 10/602
` 10/605
` 10/61
` 10/62
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`.
`
`. {having a cutting face with different
`segments, e.g. mosaic-type inserts}
`. characterised by support details, e.g. the
`substrate construction or the interface
`between the substrate and the cutting element
`. {Interface between the substrate and the
`cutting element}
`. Chisel-type inserts ({E21B 10/485,} E21B 10/52,
`E21B 10/54 take precedence)
`. characterised by conduits or nozzles for drilling
`fluids (for roller bits E21B 10/18; for percussion
`drill bits E21B 10/38)
`. {the bit being a rotary drag type bit with blades}
`.
`. {the bit being a core-bit}
`.
`. characterised by the nozzle structure
`.
`. characterised by parts, e.g. cutting elements, which
`are detachable or adjustable (E21B 10/64 takes
`precedence; for roller bits E21B 10/20; for augers
`E21B 10/44)
`
`WARNING
`
`Groups E21B 10/62 - E21B 10/633 are
`incomplete pending reclassification of
`documents from groups E21B 10/42 and
`E21B 10/43.
`All groups listed in this Warning should be
`considered in order to perform a complete
`search.
`
`
`
` 10/627
` 10/633
` 10/64
`
`. with plural detachable cutting elements
`.
`.
`.
`.
`independently detachable
`. characterised by the whole or part thereof being
`insertable into or removable from the borehole
`without withdrawing the drilling pipe (retrievable
`core receivers E21B 25/02)
`
` 11/02
`
` 11/04
`
`. Boring rams (percussion drives used in the borehole
`E21B 4/06; percussion drill bits E21B 10/36)
`. Boring grabs
`WARNING
`
`Group E21B 11/04 is incomplete pending
`reclassification of documents from groups
`E21B 11/00 and E21B 27/00.
`Groups E21B 11/00, E21B 27/00, and
`E21B 11/04 should be considered in order to
`perform a complete search.
`
`
`
` 11/06
`
`. with driven cutting chains or similarly driven tools
`
` 12/00 Accessories for drilling tools
`. Wear indicators
` 12/02
`. Drill bit protectors
` 12/04
`. Mechanical cleaning devices
` 12/06
`
`Other equipment or details for drilling; Well equipment or well
`maintenance
`
` 15/003
`
` 15/006
`
` 15/02
`
` 15/00 Supports for the drilling machine, e.g. derricks or
`masts
`. {adapted to be moved on their substructure, e.g.
`with skidding means; adapted to drill a plurality of
`wells}
`. {Means for anchoring the drilling machine to the
`ground}
`. specially adapted for underwater drilling
`(E21B 15/04 takes precedence; floating drilling
`platforms B63B 35/44; drilling platforms on legs
`E02B 17/00)
`. specially adapted for directional drilling, e.g. slant
`hole rigs
`. {Hydraulic, pneumatic or electric circuits for their
`positioning}
`
` 15/04
`
` 15/045
`
`.
`
` 17/00 Drilling rods or pipes; Flexible drill strings;
`Kellies; Drill collars; Sucker rods; {Cables;}
`Casings; Tubings (rod couplings in general F16D;
`tubes or tube couplings in general F16L)
`. {with electrically conducting or insulating means
`(E21B 17/028 and E21B 17/023 take precedence)}
`. {Accessories for drilling pipes, e.g. cleaners (wear
`protectors E21B 17/10; handling drilling pipes
`E21B 19/00; thread protectors B65D 59/00)}
`
` 17/003
`
` 17/006
`
`CPC - 2021.02
`
`6
`
`Page 6 of 25 (PGR2021-00078)
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`

`Other equipment or details for drilling; Well equipment or well maintenance
`
`E21B
`
` 17/01
`
` 17/012
`
` 17/015
`
` 17/017
` 17/02
`
`.
`
`. Risers ({supporting a riser from a drilling or
`production platform E21B 19/004;} riser connectors
`{on well heads} E21B 33/038)
`. {with buoyancy elements (E21B 17/015 takes
`precedence)}
`. {Non-vertical risers, e.g. articulated or catenary-
`type}
`. {Bend restrictors for limiting stress on risers}
`.
`. Couplings; joints {(expandable couplings or joints
`E21B 43/106)}
`
`.
`
`WARNING
`
`
`
`Group E21B 17/02 is impacted by
`reclassification into group E21B 17/041.
`Groups E21B 17/02 and E21B 17/041 should
`be considered in order to perform a complete
`search.
`
` 17/021
`
` 17/023
`
` 17/025
` 17/026
`
` 17/028
`
`.
`
`.
`
`.
`.
`
`.
`
`. {Devices for subsurface connecting or
`disconnecting by rotation}
`. {Arrangements for connecting cables or wirelines
`to downhole devices}
`. {Side entry subs}
`. {Arrangements for fixing cables or wirelines to
`the outside of downhole devices}
`. {Electrical or electro-magnetic connections}
`WARNING
`
`.
`.
`
`Group E21B 17/028 is impacted by
`reclassification into groups E21B 17/0283 and
`E21B 17/0285.
`Groups E21B 17/028, E21B 17/0283, and
`E21B 17/0285 should be considered in order
`to perform a complete search.
`
`
`
` 17/0283
`
`.
`
`.
`
`. {characterised by the coupling being
`contactless, e.g. inductive}
`
`WARNING
`
`Group E21B 17/0283 is incomplete pending
`reclassification of documents from group
`E21B 17/028.
`Groups E21B 17/028 and E21B 17/0283
`should be considered in order to perform a
`complete search.
`
`
`
` 17/0285
`
`.
`
`.
`
`. {characterised by electrically insulating
`elements}
`
`WARNING
`
`Group E21B 17/0285 is incomplete pending
`reclassification of documents from group
`E21B 17/028.
`Groups E21B 17/028 and E21B 17/0285
`should be considered in order to perform a
`complete search.
`
`
`
` 17/03
`
`.
`
`. between drilling rod or pipe and drill motor {or
`surface drive}, e.g. between drilling rod and
`hammer
`
` 17/04
`
`.
`
`. between rod {or the like} and bit or between rod
`and rod {or the like}
`
`WARNING
`
`
`
`Group E21B 17/04 is impacted by
`reclassification into group E21B 17/041.
`Groups E21B 17/04 and E21B 17/041 should
`be considered in order to perform a complete
`search.
`
` 17/041
`
`.
`
`.
`
`. {specially adapted for coiled tubing}
`WARNING
`
`Group E21B 17/041 is incomplete pending
`reclassification of documents from groups
`E21B 17/02 and E21B 17/04.
`Groups E21B 17/02, E21B 17/04, and
`E21B 17/041 should be considered in order
`to perform a complete search.
`
`
`
` 17/042
` 17/0423
`
` 17/0426
`
` 17/043
` 17/046
`
`.
`.
`
`.
`
`.
`.
`
`.
`.
`
`.
`
`.
`.
`
`.
`
`. Threaded
`.
`. {with plural threaded sections, e.g. with two-
`step threads}
`. {with a threaded cylindrical portion, e.g. for
`percussion rods}
`. with locking means
`.
`. with ribs, pins, or jaws, and complementary
`grooves or the like, e.g. bayonet catches
`
`WARNING
`
`
`
`Group E21B 17/046 is impacted by
`reclassification into group E21B 17/0465.
`Groups E21B 17/046 and E21B 17/0465
`should be considered in order to perform a
`complete search.
`
` 17/0465
`
`.
`
`.
`
`.
`
`. {characterised by radially inserted locking
`elements}
`
`WARNING
`
`Group E21B 17/0465 is incomplete
`pending reclassification of documents
`from group E21B 17/046.
`Groups E21B 17/046 and E21B 17/0465
`should be considered in order to perform
`a complete search.
`
`
`
` 17/05
` 17/06
` 17/07
`
` 17/073
` 17/076
` 17/08
` 17/085
`
`.
`.
`.
`
`.
`.
`.
`.
`
`.
`.
`.
`
`. Swivel joints
`. Releasing-joints, e.g. safety joints
`. Telescoping joints for varying drill string
`lengths; Shock absorbers (heave compensators
`in the derrick E21B 19/09; releasing-jars
`E21B 31/107)
`. {with axial rotation}
`.
`.
`. {between rod or pipe and drill bit}
`.
`.
`. Casing joints
`.
`. {Riser connections (connectors for wellhead
`E21B 33/038)}
`
`WARNING
`
`
`
`Group E21B 17/085 is impacted by
`reclassification into group E21B 17/0853.
`Groups E21B 17/085 and E21B 17/0853
`should be considered in order to perform a
`complete search.
`
`CPC - 2021.02
`
`7
`
`Page 7 of 25 (PGR2021-00078)
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`
`

`

`Other equipment or details for drilling; Well equipment or well maintenance
`
`E21B
`
` 17/0853
`
`.
`
`.
`
`.
`
`. {Connections between sections of riser
`provided with auxiliary lines, e.g. kill and
`choke lines}
`
`WARNING
`
`Group E21B 17/0853 is incomplete
`pending reclassification of documents
`from group E21B 17/085.
`Groups E21B 17/085 and E21B 17/0853
`should be considered in order to perform
`a complete search.
`
`
`
` 17/10
`
` 17/1007
`
` 17/1014
`
` 17/1021
` 17/1028
`
` 17/1035
`
` 17/1042
` 17/105
` 17/1057
`
` 17/1064
` 17/1071
`
` 17/1078
`
` 17/1085
`
` 17/1092
` 17/12
`
` 17/14
`
` 17/16
` 17/18
`
` 17/20
`
` 17/203
` 17/206
` 17/22
`
`.
`
`.
`
`.
`.
`
`.
`.
`
`.
`
`.
`.
`.
`
`.
`.
`
`.
`
`.
`
`.
`.
`
`. Wear protectors; Centralising devices {, e.g.
`stabilisers} (drives used in the borehole with
`anchoring means E21B 4/18; guiding or centralising
`devices outside the borehole E21B 19/24)
`. {for the internal surface of a pipe, e.g. wear
`bushings for underwater well-heads}
`. {Flexible or expansible centering means, e.g.
`with pistons pressing against the wall of the well
`(E21B 17/1042 takes precedence)}
`. {with articulated arms or arcuate springs}
`.
`. {with arcuate springs only, e.g. baskets
`with outwardly bowed strips for cementing
`operations}
`. {for plural rods, pipes or lines, e.g. for control
`lines}
`. {Elastomer protector or centering means}
`.
`. {split type}
`. {Centralising devices with rollers or with a
`relatively rotating sleeve (E21B 17/1014 takes
`precedence)}
`. {Pipes or rods with a relatively rotating sleeve}
`.
`. {specially adapted for pump rods, e.g. sucker
`rods}
`. {Stabilisers or centralisers for casing, tubing or
`drill pipes (devices for off-center positioning
`E21B 17/10; E21B 17/1007 - E21B 17/1064 take
`precedence)}
`. {Wear protectors; Blast joints; Hard facing (wear
`protection included in centralising d