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DIFF Subgroup
B21D 3/12

by stretching with or without twisting (by twisting only B21D11/14)

Introduced: September 1968

Title

Titles differ between systems:

IPC: by stretching with or without twisting

CPC: by stretching with or without twisting (by twisting only B21D11/14)

Full Title

Full titles differ between systems:

IPC:

Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts > by stretching with or without twisting

CPC:

Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts (straightening of well casings in situ E21B; ) > by stretching with or without twisting (by twisting only B21D11/14)

No child classifications to compare. This is a leaf node in both IPC and CPC.

Top Applicants

Top Applicants (IPC)

Class B21,2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL 2,318
  2. JFE STEEL JP 2,294
  3. POSCO (POHANG IRON AND STEEL COMPANY) KR 2,083
  4. NIPPON STEEL CORPORATION JP 1,650
  5. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 1,631
  6. SMS GROUP DE 1,472
  7. BAOSHAN IRON & STEEL COMPANY 1,181
  8. SGCC(STATE GRID CORPORATION OF CHINA) 1,079
  9. ANHUI JIANGHUAI AUTOMOBILE 984
  10. HYUNDAI STEEL COMPANY KR 980

Top Applicants (CPC)

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