IPC Subgroup
B21B 28/02 Maintaining rolls in effective condition, e.g. reconditioning
Introduced: July 1974
Last revised: January 2006
Full Title
Maintaining rolls or rolling equipment in effective condition > Maintaining rolls in effective condition, e.g. reconditioning
Classification Context
- Section:
- PERFORMING OPERATIONS; TRANSPORTING
- Class:
- MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- Subclass:
- ROLLING OF METAL
Related Keywords
REPAIRING of rolls of metal-rolling mills
1 direct subcode
Child Classifications
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- B21B 28/04 while in use, e.g. polishing
Top Applicants
Top 10 applicants by patent filingsfor 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