with mechanical slips for hooking into the casing (E21B33/122, E21B33/124 take precedence)

Introduced: September 1968

Title

Titles differ between systems:

IPC: with mechanical slips for hooking into the casing

CPC: with mechanical slips for hooking into the casing (E21B33/122, E21B33/124 take precedence)

Full Title

Full titles differ between systems:

IPC:

Sealing or packing boreholes or wells > in the borehole > Packers; Plugs > with mechanical slips for hooking into the casing

CPC:

Sealing or packing boreholes or wells > in the borehole > Packers; Plugs (used for cementing E21B33/134, E21B33/16) > with mechanical slips for hooking into the casing (E21B33/122, E21B33/124 take precedence)

CPC subdivides this area 4x more granularly than IPC with 3 additional codes.

3 codes are CPC-only extensions.

IPC defines codes here since 1995.

Child Classifications

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E21B 33/1291 +1 CPC CPC only CPC only
E21B 33/1293 CPC only CPC only
E21B 33/1294 CPC only CPC only
E21B 33/1295 actuated by fluid pressure since 1995 +1 CPC IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class E21,2013–2023, worldwide · Source: EPO PATSTAT

HALLIBURTON ENERGY SERVICES GROUP US 26,607
PETROCHINA COMPANY 14,382
SINOPEC (CHINA PETROCHEMICAL CORPORATION) 10,137
CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 6,517
BAKER HUGHES US 6,269
SCHLUMBERGER TECHNOLOGY US 5,929
SAUDI ARABIAN OIL COMPANY SA 5,880
SOUTHWEST PETROLEUM UNIVERSITY 4,477
CHINA UNIVERSITY OF MINING AND TECHNOLOGY 4,357
SCHLUMBERGER TECHNOLOGY NL 4,219

Top Applicants (CPC)

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