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DIFF Subgroup
C21C 5/30

Regulating or controlling the blowing

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Manufacture of carbon steel, e.g. plain mild steel, medium carbon steel, or cast-steel > Manufacture of steel in the converter > Regulating or controlling the blowing

CPC:

Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel > Manufacture of steel in the converter > Regulating or controlling the blowing

Of 4 combined children, 3 exist in both systems.

1 codes are CPC-only extensions.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • C21C 5/305 CPC only CPC only
  • C21C 5/32 Blowing from above (C21C5/35 takes precedence) IPC+CPC Available in IPC and CPC
  • C21C 5/34 Blowing through the bath (C21C5/35 takes precedence) IPC+CPC Available in IPC and CPC
  • C21C 5/35 Blowing from above and through the bath since 1990 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class C21,2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL JP 7,470
  2. POSCO (POHANG IRON AND STEEL COMPANY) KR 4,615
  3. JFE STEEL 4,538
  4. NIPPON STEEL CORPORATION JP 4,536
  5. ARCELORMITTAL LU 2,597
  6. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,241
  7. ANGANG STEEL COMPANY 2,126
  8. NSSMC (NIPPON STEEL & SUMITOMO METAL) 1,783
  9. BAOSHAN IRON & STEEL COMPANY 1,620
  10. HYUNDAI STEEL COMPANY KR 1,545

Top Applicants (CPC)

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