IPC Subgroup
B21D 28/24 Perforating, i.e. punching holes
Introduced: September 1968
Last revised: January 2006
Full Title
Shaping by press-cutting; Perforating > Perforating, i.e. punching holes
Classification Context
- Section:
- PERFORMING OPERATIONS; TRANSPORTING
- Class:
- MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- Subclass:
- WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
Related Keywords
PERFORATING by punching
6 direct subcodes
Child Classifications
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- B21D 28/26 in sheets or flat parts
- B21D 28/28 in tubes or other hollow bodies
- B21D 28/3 in annular parts, e.g. rims
- B21D 28/32 in other articles of special shape
- B21D 28/34 Perforating tools; Die holders
- B21D 28/36 using rotatable work or tool holders
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