Combining the chain links with auxiliary parts, e.g. welding-on wear-resistant parts

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Making chains or chain links, the links being composed of two or more different parts, e.g. drive chains > of roller-chain or other plate-link type > Combining the chain links with auxiliary parts, e.g. welding-on wear-resistant parts

CPC:

Making chains or chain links, the links being composed of two or more different parts, e.g. drive chains (B21L1/04, B21L7/00, B21L11/14, B21L13/00 take precedence) > of roller-chain or other plate-link type > Combining the chain links with auxiliary parts, e.g. welding-on wear-resistant parts

No child classifications to compare. This is a leaf node in both 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