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IPC Subgroup
E21C 29/06

anchored at one or both ends to the mine working face

Introduced: September 1968

Last revised: January 2006

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

Classification Context

Section:
FIXED CONSTRUCTIONS
Class:
EARTH OR ROCK DRILLING; MINING
Subclass:
MINING OR QUARRYING

3 direct subcodes

Child Classifications

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  • E21C 29/08 Anchoring arrangements
  • E21C 29/1 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 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