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IPC Subgroup
E21C 41/26

Methods of surface mining; Layouts therefor

Introduced: January 1990

Last revised: January 2006

Full Title

Methods of underground or surface mining; Layouts therefor > Methods of surface mining; Layouts therefor

Classification Context

Section:
FIXED CONSTRUCTIONS
Class:
EARTH OR ROCK DRILLING; MINING
Subclass:
MINING OR QUARRYING

Filing statistics

IPC E21C 41/26 belongs to the parent subclass E21C, which recorded 26,652 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,927 in 2013 to 2,756 in 2023 (+43%), peaking at 3,140 applications in 2020. The most active applicants in class E21 are HALLIBURTON ENERGY SERVICES GROUP (26,607 applications), PETROCHINA COMPANY (14,382 applications) and SINOPEC (CHINA PETROCHEMICAL CORPORATION) (10,137 applications).

Source: EPO PATSTAT, worldwide filings

Related Keywords

mining LIGNITE

2 direct subcodes

Child Classifications

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Top Applicants

Top 10 applicants by patent filingsfor 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