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PCE
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DIFF Subgroup
E21D 15/16

with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Props; Chocks > Telescopic props > with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure

CPC:

Props (in the building art E04G25/00); Chocks > Telescopic props (general means for fixing telescopic parts together ) > with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • E21D 15/18 with one part resting on a supporting medium, e.g. rubber, sand, bitumen, lead, located in the other part, with or without expulsion or displacement of the medium upon excessive pressure IPC+CPC Available in IPC and CPC
  • E21D 15/20 with pawl, pin, cross-piece, or the like engaging with ratchet teeth, notches, holes, or the like, spaced apart at intervals IPC+CPC Available in IPC and CPC
  • E21D 15/22 with member, pin, cross- piece, or the like, ruptured, sheared through, or permanently deformed upon excessive pressure IPC+CPC Available in IPC and CPC

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