CPC Main Group
B21D 39/00 Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating ( riveting B21J; uniting components by forging or pressing to form integral members B21K25/00; welding B23K; press-fitting, force-fitting, or shrinking in general B23P11/00, B21D19/00; by adhesives F16B11/00 ); Tube expanders
Filing statistics
CPC B21D 39/00 belongs to the parent subclass B21D, which recorded 119,625 patent applications worldwide between 2013 and 2023. Annual filings grew from 6,189 in 2013 to 10,326 in 2023 (+67%), peaking at 14,303 applications in 2020. The most active applicants in class B21 are JFE STEEL (2,667 applications), NIPPON STEEL CORPORATION (2,049 applications) and POSCO (POHANG IRON AND STEEL COMPANY) (1,967 applications).
Source: EPO PATSTAT, worldwide filings
5 direct subcodes
Child Classifications
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- B21D 39/02 of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
- B21D 39/03 of sheet metal otherwise than by folding
- B21D 39/04 of tubes with tubes; of tubes with rods
- B21D 39/06 of tubes in openings, e.g. rolling-in
- B21D 39/08 Tube expanders
Top Applicants
Top 10 applicants by patent filingsfor class B21, 2013–2023, worldwide · Source: EPO PATSTAT
- JFE STEEL JP 2,667
- NIPPON STEEL CORPORATION JP 2,049
- POSCO (POHANG IRON AND STEEL COMPANY) KR 1,967
- NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 1,800
- SMS GROUP DE 1,538
- JFE STEEL 1,150
- ARCELORMITTAL LU 1,142
- BAOSHAN IRON & STEEL COMPANY 821
- HYUNDAI STEEL COMPANY KR 808
- THYSSENKRUPP STEEL EUROPE DE 660