Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00 (corrugating or bending into wave form B21D13/00, B21D15/00; flanging B21D19/00); Twisting

Filing statistics

CPC B21D 11/00 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

8 direct subcodes

Child Classifications

Navigate with arrow keys, Enter to open

B21D 11/02 Bending by stretching or pulling over a die (working sheet metal of limited length by stretching B21D25/00)
B21D 11/06 Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form (making helically seamed tubing B21C37/12)
B21D 11/08 Bending by altering the thickness of part of the cross-section of the work (B21D11/06 takes precedence)
B21D 11/10 Bending specially adapted to produce specific articles, e.g. leaf springs
B21D 11/14 Twisting
B21D 11/18 Joggling
B21D 11/20 Bending sheet metal, not otherwise provided for
B21D 11/22 Auxiliary equipment, e.g. positioning devices

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