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CPC Subgroup
C21B 9/10

Other details, e.g. blast mains

Full Title

Stoves for heating the blast in blast furnaces > Other details, e.g. blast mains

Filing statistics

CPC C21B 9/10 belongs to the parent subclass C21B, which recorded 18,493 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,109 in 2013 to 2,100 in 2023 (+89%), peaking at 2,528 applications in 2022. The most active applicants in class C21 are JFE STEEL (8,270 applications), NIPPON STEEL CORPORATION (5,222 applications) and POSCO (POHANG IRON AND STEEL COMPANY) (4,824 applications).

Source: EPO PATSTAT, worldwide filings

1 direct subcode

Child Classifications

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  • C21B 9/12 Hot-blast valves or slides for blast furnaces (valves in general F16K)

Top Applicants

Top 10 applicants by patent filingsfor class C21, 2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL JP 8,270
  2. NIPPON STEEL CORPORATION JP 5,222
  3. POSCO (POHANG IRON AND STEEL COMPANY) KR 4,824
  4. JFE STEEL 3,311
  5. ARCELORMITTAL LU 3,239
  6. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,659
  7. HYUNDAI STEEL COMPANY KR 1,492
  8. ANGANG STEEL COMPANY 1,318
  9. BAOSHAN IRON & STEEL COMPANY 1,233
  10. KOBE STEEL JP 1,228