CPC Subgroup
E21B 43/116 Gun or shaped-charge perforators
Full Title
Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (applicable only to water E03B) > Perforators; Permeators > Gun or shaped-charge perforators
3 direct subcodes
Child Classifications
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- E21B 43/117 Shaped-charge perforators (E21B43/118 takes precedence)
- E21B 43/118 characterised by lowering in vertical position and subsequent tilting to operating position
- E21B 43/1185 Ignition systems
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