B21D 51/26 cans or tins; Closing same in a permanent manner (making outlet arrangements B21D51/38; welding or soldering B23K)
Introduced: September 1968
Title
Titles differ between systems:
IPC: cans or tins; Closing cans or tins in a permanent manner
CPC: cans or tins; Closing same in a permanent manner (making outlet arrangements B21D51/38; welding or soldering B23K)
Full Title
Full titles differ between systems:
Making hollow objects > characterised by the use of the objects > cans or tins; Closing cans or tins in a permanent manner
Making hollow objects (from thick-walled or non uniform tubes B21K21/00) > characterised by the use of the objects (making heat exchangers B21D53/02) > cans or tins; Closing same in a permanent manner (making outlet arrangements B21D51/38; welding or soldering B23K)
CPC subdivides this area 5x more granularly than IPC with 8 additional codes.
8 codes are CPC-only extensions.
Child Classifications
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Top Applicants
Top Applicants (IPC)
Class B21,2013–2023, worldwide · Source: EPO PATSTAT
- JFE STEEL 2,318
- JFE STEEL JP 2,294
- POSCO (POHANG IRON AND STEEL COMPANY) KR 2,083
- NIPPON STEEL CORPORATION JP 1,650
- NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 1,631
- SMS GROUP DE 1,472
- BAOSHAN IRON & STEEL COMPANY 1,181
- SGCC(STATE GRID CORPORATION OF CHINA) 1,079
- ANHUI JIANGHUAI AUTOMOBILE 984
- HYUNDAI STEEL COMPANY KR 980
Top Applicants (CPC)
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