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PCE
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DIFF Subgroup
E21D 15/22

with member, pin, cross- piece, or the like, ruptured, sheared through, or permanently deformed upon excessive pressure

Introduced: September 1968

Title

Titles differ between systems:

IPC: with member, pin, cross-piece, or the like ruptured, sheared through, or permanently deformed upon excessive pressure

CPC: with member, pin, cross- piece, or the like, ruptured, sheared through, or permanently deformed upon excessive pressure

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 > with member, pin, cross-piece, or the like ruptured, sheared through, or permanently deformed upon 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 > with member, pin, cross- piece, or the like, ruptured, sheared through, or permanently deformed upon excessive pressure

No child classifications to compare. This is a leaf node in both 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