DIFF Subgroup
B21B 37/58 Roll-force control; Roll-gap control
Introduced: January 1995
Full Title
Full titles differ between systems:
IPC:
Control devices or methods specially adapted for metal-rolling mills or the work produced thereby > Roll-force control; Roll-gap control
CPC:
Control devices or methods specially adapted for metal-rolling mills or the work produced thereby (methods or devices for measuring specially adapted for metal-rolling mills B21B38/00) > Roll-force control; Roll-gap control
IPC and CPC are identically structured here. All 4 subcodes exist in both systems.
IPC defines codes here since 1995.
Child Classifications
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- B21B 37/60 by control of a motor which drives an adjusting screw since 1995 IPC+CPC Available in IPC and CPC
- B21B 37/64 Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands since 1995 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