C21D 8/02 during manufacturing of plates or strips (C21D8/12 takes precedence)
Introduced: January 1980
Title
Titles differ between systems:
IPC: during manufacturing of plates or strips
CPC: during manufacturing of plates or strips (C21D8/12 takes precedence)
Full Title
Full titles differ between systems:
Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment > during manufacturing of plates or strips
Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) > during manufacturing of plates or strips (C21D8/12 takes precedence)
IPC and CPC are identically structured here. All 6 subcodes exist in both systems.
1 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1980.
Child Classifications
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- C21D 8/021 involving particular fabrication steps or treatments of ingots or slabs since 2026 +1 CPC IPC+CPC Available in IPC and CPC
- C21D 8/0278 involving a particular surface treatment (C21D8/0294 takes precedence) since 2026 +2 CPC IPC+CPC Available in IPC and CPC
- C21D 8/04 to produce plates or strips for drawing, e.g. for deep-drawing since 1980 +5 CPC IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class C21,2013–2023, worldwide · Source: EPO PATSTAT
- JFE STEEL JP 7,470
- POSCO (POHANG IRON AND STEEL COMPANY) KR 4,615
- JFE STEEL 4,538
- NIPPON STEEL CORPORATION JP 4,536
- ARCELORMITTAL LU 2,597
- NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,241
- ANGANG STEEL COMPANY 2,126
- NSSMC (NIPPON STEEL & SUMITOMO METAL) 1,783
- BAOSHAN IRON & STEEL COMPANY 1,620
- HYUNDAI STEEL COMPANY KR 1,545
Top Applicants (CPC)
Class C21,2013–2023, worldwide · Source: EPO PATSTAT
- JFE STEEL JP 8,270
- NIPPON STEEL CORPORATION JP 5,222
- POSCO (POHANG IRON AND STEEL COMPANY) KR 4,824
- JFE STEEL 3,311
- ARCELORMITTAL LU 3,239
- NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,659
- HYUNDAI STEEL COMPANY KR 1,492
- ANGANG STEEL COMPANY 1,318
- BAOSHAN IRON & STEEL COMPANY 1,233
- KOBE STEEL JP 1,228