B21H MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS (essentially from sheet metal B21D)
Introduced: September 1968
Description
B21H encompasses mechanical metal-working processes that form specific finished metal articles or near-finished components through rolling operations, without material removal. The subclass covers techniques for manufacturing discrete objects such as screws, wheels, rings, barrels, balls, and similar items where rolling is the primary shaping method. This includes cold rolling, hot rolling, and thread rolling processes applied to achieve dimensional accuracy and desired material properties in the final product. Related forming operations are classified elsewhere—B21B covers flat-rolled products (strip, sheet, plate), while B21G addresses other metal-working methods like forging and bending.
Title
Titles differ between systems:
IPC: MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
CPC: MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS (essentially from sheet metal B21D)
Full Title
Full titles differ between systems:
MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS (essentially from sheet metal B21D)
IPC and CPC are identically structured here. All 6 subcodes exist in both systems.
3 shared codes have differing titles between IPC and CPC.
Child Classifications
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- B21H 1/00 Making articles shaped as bodies of revolution (rolling tubes B21B17/00 - B21B25/00) IPC+CPC Available in IPC and CPC
- B21H 3/00 Making helical bodies or bodies having parts of helical shape (helical gears B21H5/00; forming tubes or tube walls into helical shape B21D11/06, B21D15/04) IPC+CPC Available in IPC and CPC
- B21H 7/00 Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons (nails, pins B21G3/30) +3 CPC IPC+CPC Available in IPC and CPC
- B21H 8/00 Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects +1 CPC IPC+CPC Available in IPC and CPC
- B21H 9/00 Feeding arrangements for rolling machines or apparatus manufacturing articles dealt with in this subclass 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