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CPC Subgroup
B21D 53/04

of sheet metal

Full Title

Making other particular articles (making wire fabrics B21F; making chains or chain parts B21L) > heat exchangers , e.g. radiators, condensers (making finned or ribbed tubes by fixing strip material or the like to tubes B21C37/22) > of sheet metal

1 direct subcode

Child Classifications

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Top Applicants

Top 10 applicants by patent filingsfor class B21, 2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL JP 2,667
  2. NIPPON STEEL CORPORATION JP 2,049
  3. POSCO (POHANG IRON AND STEEL COMPANY) KR 1,967
  4. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 1,800
  5. SMS GROUP DE 1,538
  6. JFE STEEL 1,150
  7. ARCELORMITTAL LU 1,142
  8. BAOSHAN IRON & STEEL COMPANY 821
  9. HYUNDAI STEEL COMPANY KR 808
  10. THYSSENKRUPP STEEL EUROPE DE 660