E21C 35/00 Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
Introduced: September 1968
Title
Titles differ between systems:
IPC: Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups , or
CPC: Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
Full Title
Full titles differ between systems:
Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups , or
Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
Of 10 combined children, 8 exist in both systems.
2 codes are CPC-only extensions.
4 shared codes have differing titles between IPC and CPC.
Child Classifications
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- E21C 35/04 Safety devices (operating in the event of breakage of a haulage cable or chain E21C29/20) +2 CPC IPC+CPC Available in IPC and CPC
- E21C 35/06 Equipment for positioning the whole machine in relation to its sub-structure IPC+CPC Available in IPC and CPC
- E21C 35/18 Mining picks; Holders therefor (planing knives E21C27/44) +3 CPC IPC+CPC Available in IPC and CPC
- E21C 35/20 General features of equipment for removal of chippings, e.g. for loading on conveyor IPC+CPC Available in IPC and CPC
- E21C 35/22 Equipment for preventing the formation of, or for removal of, dust (picks with arrangement of fluid-spraying nozzles E21C35/187; ) +2 CPC IPC+CPC Available in IPC and CPC
- E21C 35/24 Remote control specially adapted for machines for slitting or completely freeing the mineral (control in general G05) 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