CPC Subgroup
E21B 43/01 specially adapted for obtaining from underwater installations
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) > specially adapted for obtaining from underwater installations
4 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- E21B 43/013 Connecting a production flow line to an underwater well head
- E21B 43/017 Production satellite stations, i.e. underwater installations comprising a plurality of satellite well heads connected to a central station
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