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IPC Main Group
B21D 3/00

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

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:
PERFORMING OPERATIONS; TRANSPORTING
Class:
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
Subclass:
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL

Filing statistics

IPC B21D 3/00 belongs to the parent subclass B21D, which recorded 351,007 patent applications worldwide between 2013 and 2023. Annual filings grew from 16,565 in 2013 to 42,835 in 2023 (+159%), peaking at 47,343 applications in 2020. The most active applicants in class B21 are JFE STEEL (2,318 applications), JFE STEEL (2,294 applications) and POSCO (POHANG IRON AND STEEL COMPANY) (2,083 applications).

Source: EPO PATSTAT, worldwide filings

Additional Content

Bending, e.g. for straightening rails or rail joints Reconditioning of well casings, e.g. straightening

Related Keywords

restoring form or straightening of rods, tubes, profiles or specific articles made therefromSTRAIGHTENING metal sheet, rod, tubing or profiles or articles made therefrom

5 direct subcodes

Child Classifications

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  • B21D 3/1 between rams and anvils or abutments
  • B21D 3/12 by stretching with or without twisting
  • B21D 3/14 Recontouring
  • B21D 3/16 of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially-adapted methods or means

Top Applicants

Top 10 applicants by patent filingsfor 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