CPC Subgroup
B21D 51/04 built-up objects, e.g. objects with rigidly-attached bottom or cover
Full Title
Making hollow objects (from thick-walled or non uniform tubes B21K21/00) > characterised by the structure of the objects > built-up objects, e.g. objects with rigidly-attached bottom or cover
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