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PCE
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CPC Subgroup
E21C 29/06

anchored at one or both ends to the mine working face

Full Title

Propulsion of machines for slitting or completely freeing the mineral from the seam > by cable or chains > anchored at one or both ends to the mine working face

3 direct subcodes

Child Classifications

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  • E21C 29/08 Anchoring arrangements (for anchoring of conveyors only E21F13/00)
  • E21C 29/10 Cable or chain co-operating with a winch or the like on the machine
  • E21C 29/12 Machines propelled by thrust or pull against a part alternately anchored to and released from a cable or chain

Top Applicants

Top 10 applicants by patent filingsfor 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