Making by using boring or cutting machines (E21D9/08 takes precedence; mining picks E21C35/18)

Introduced: July 1974

Title

Titles differ between systems:

IPC: Making by using boring or cutting machines

CPC: Making by using boring or cutting machines (E21D9/08 takes precedence; mining picks E21C35/18)

Full Title

Full titles differ between systems:

IPC:

Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries > Making by using boring or cutting machines

CPC:

Tunnels or galleries, with or without linings; Methods or apparatus for making thereof (E02D29/045, E02D29/063 take precedence; linings per se E21D11/00); Layout of tunnels or galleries > Making by using boring or cutting machines (E21D9/08 takes precedence; mining picks E21C35/18)

CPC subdivides this area 9x more granularly than IPC with 8 additional codes.

8 codes are CPC-only extensions.

IPC defines codes here since 2000.

Child Classifications

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E21D 9/1006 +2 CPC CPC only CPC only
E21D 9/1053 CPC only CPC only
E21D 9/106 CPC only CPC only
E21D 9/1066 CPC only CPC only
E21D 9/1073 CPC only CPC only
E21D 9/108 CPC only CPC only
E21D 9/1086 CPC only CPC only
E21D 9/1093 CPC only CPC only
E21D 9/11 with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines since 2000 +3 CPC IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class E21,2013–2023, worldwide · Source: EPO PATSTAT

HALLIBURTON ENERGY SERVICES GROUP US 26,607
PETROCHINA COMPANY 14,382
SINOPEC (CHINA PETROCHEMICAL CORPORATION) 10,137
CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 6,517
BAKER HUGHES US 6,269
SCHLUMBERGER TECHNOLOGY US 5,929
SAUDI ARABIAN OIL COMPANY SA 5,880
SOUTHWEST PETROLEUM UNIVERSITY 4,477
CHINA UNIVERSITY OF MINING AND TECHNOLOGY 4,357
SCHLUMBERGER TECHNOLOGY NL 4,219

Top Applicants (CPC)

Class E21,2013–2023, worldwide · Source: EPO PATSTAT

HALLIBURTON ENERGY SERVICES GROUP US 27,652
SAUDI ARABIAN OIL COMPANY SA 7,755
PETROCHINA COMPANY 7,025
BAKER HUGHES US 6,589
SCHLUMBERGER TECHNOLOGY US 6,151
SINOPEC (CHINA PETROCHEMICAL CORPORATION) 4,443
SCHLUMBERGER TECHNOLOGY NL 4,255
CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 3,991
SERVICES PETROLIERS SCHLUMBERGER FR 3,300
SCHLUMBERGER CANADA CA 3,086