B21F WORKING OR PROCESSING OF METAL WIRE (rolling of metal wire B21B1/16; by drawing, auxiliary operations used in connection with metal-working without essentially removing material B21C)
Introduced: September 1968
Description
B21F covers mechanical operations performed on metal wire without material removal, including drawing, twisting, coiling, straightening, and bundling processes. This subclass encompasses machinery and methods for transforming wire stock into finished or semi-finished products for applications such as fasteners, springs, cables, and reinforcement materials. Operations typically involve plastic deformation, bending, or assembly of wire components rather than cutting or grinding. Related wire coating, insulation, and electroplating processes are excluded, falling instead under classes B05, B29, or C23.
Title
Titles differ between systems:
IPC: WORKING OR PROCESSING OF METAL WIRE
CPC: WORKING OR PROCESSING OF METAL WIRE (rolling of metal wire B21B1/16; by drawing, auxiliary operations used in connection with metal-working without essentially removing material B21C)
Full Title
Full titles differ between systems:
WORKING OR PROCESSING OF METAL WIRE
WORKING OR PROCESSING OF METAL WIRE (rolling of metal wire B21B1/16; by drawing, auxiliary operations used in connection with metal-working without essentially removing material B21C)
Additional Content IPC
Limiting references
Metal rolling methods or mills for making semi-finished products of solid or profiled cross-section, for rolling wire or material of like small cross-section Manufacture of metal sheets, wire, rods, tubes, profiles or like semi-manufactured products otherwise than by rolling; Auxiliary operations used in connection with metal-working without essentially removing material
Application references
Processes for changing of physical properties of metals ,
IPC and CPC are identically structured here. All 23 subcodes exist in both systems.
6 shared codes have differing titles between IPC and CPC.
Child Classifications
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- B21F 1/00 Bending wire other than coiling; Straightening wire +4 CPC IPC+CPC Available in IPC and CPC
- B21F 15/00 Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire (tools for both straining and connecting B21F9/02; jacketing or reinforcing B21F17/00; manufacture of wire network B21F27/00; in making bands B21F43/00) IPC+CPC Available in IPC and CPC
- B21F 19/00 Metallic coating of wire (by extruding B21C23/24; by soldering or welding, e.g. cladding or plating, B23K) IPC+CPC Available in IPC and CPC
- B21F 23/00 Feeding wire in wire-working machines or apparatus +2 CPC IPC+CPC Available in IPC and CPC
- B21F 27/00 Making wire network, i.e. wire nets (making meshed-ring network from wire B21F31/00; in making bands B21F43/00) +1 CPC IPC+CPC Available in IPC and CPC
- B21F 29/00 Making fencing or like material made partly of wire (B21F25/00 takes precedence) IPC+CPC Available in IPC and CPC
- B21F 33/00 Tools or devices specially designed for handling or processing wire fabrics or the like +3 CPC IPC+CPC Available in IPC and CPC
- B21F 45/00 Wire-working in the manufacture of other particular articles (of pins, needles, nails, hairpins B21G; of chains B21L) +4 CPC 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