CPC Main Group
B21B 13/00 Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories (B21B17/00 - B21B23/00 take precedence)
Filing statistics
CPC B21B 13/00 belongs to the parent subclass B21B, which recorded 40,295 patent applications worldwide between 2013 and 2023. Annual filings grew from 2,451 in 2013 to 4,508 in 2023 (+84%), peaking at 4,702 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
12 direct subcodes
Child Classifications
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- B21B 13/02 with axes of rolls arranged horizontally
- B21B 13/06 with axes of rolls arranged vertically
- B21B 13/08 with differently-directed roll axes, e.g. for the so-called "universal" rolling process
- B21B 13/14 having counter-pressure devices acting on rolls to inhibit deflection of same under load; (counter-pressure devices as such B21B29/00)
- B21B 13/16 with alternatively operative rolls
- B21B 13/18 for step-by-step or planetary rolling; (methods B21B1/42; making tubes by pilgrim-step rolling B21B21/00)
- B21B 13/22 for rolling metal immediately subsequent to continuous casting, (methods therefor B21B1/46; continuous casting B22D11/00, e.g. into moulds with rolls B22D11/06)
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