CPC Subgroup
E21C 29/14 by haulage cable or chain pulling the machine along the working face
Full Title
Propulsion of machines for slitting or completely freeing the mineral from the seam > by cable or chains > by haulage cable or chain pulling the machine along the working face
3 direct subcodes
Child Classifications
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- E21C 29/16 Winches or other means for pulling cable or chain (winches in general B66D)
- E21C 29/18 Coupling and uncoupling machine to cable or chain
Top Applicants
Top 10 applicants by patent filingsfor 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