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PCE
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CPC Main Group
C21C 1/00

Refining of pig-iron; Cast iron

5 direct subcodes

Child Classifications

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  • C21C 1/04 Removing impurities other than carbon, phosphorus or sulfur
  • C21C 1/06 Constructional features of mixers for pig-iron
  • C21C 1/08 Manufacture of cast-iron

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