CPC Main Group
B21F 35/00 Making springs from wire
Filing statistics
CPC B21F 35/00 belongs to the parent subclass B21F, which recorded 20,343 patent applications worldwide between 2013 and 2023. Annual filings grew from 703 in 2013 to 2,160 in 2023 (+207%), peaking at 3,062 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
4 direct subcodes
Child Classifications
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- B21F 35/02 Bending or deforming ends of coil springs to special shape
- B21F 35/04 Making flat springs, e.g. sinus springs
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