Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Making hollow articles not covered by any single one of groups > Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs

CPC:

Making hollow articles not covered by a single preceding sub-group (essentially from sheet-metal or uniform thin-walled tubes B21D, e.g. B21D41/00, B21D51/00) > Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs

IPC and CPC are identically structured here. All 1 subcodes exist in both systems.

Child Classifications

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B21K 21/10 cone-shaped or bell-shaped articles, e.g. insulator caps IPC+CPC Available in IPC and CPC

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