Skip to content
Search Classifications
Search for IPC and CPC classification codes or keywords
DIFF Main Group
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:

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

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

Navigate with arrow keys, Enter to open

  • E21C 35/02 Locking equipment for slewable parts 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 35/20 General features of equipment for removal of chippings, e.g. for loading on conveyor 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
  • E21C 35/282 CPC only CPC only
  • E21C 35/302 CPC only CPC only

Top Applicants

Top Applicants (IPC)

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

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

Top Applicants (CPC)

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

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