C21D 8/02 during manufacturing of plates or strips (C21D8/12 takes precedence)
Full Title
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)
Filing statistics
CPC C21D 8/02 belongs to the parent subclass C21D, which recorded 112,271 patent applications worldwide between 2013 and 2023. Annual filings grew from 6,047 in 2013 to 10,554 in 2023 (+75%), peaking at 12,689 applications in 2020. The most active applicants in class C21 are JFE STEEL (8,270 applications), NIPPON STEEL CORPORATION (5,222 applications) and POSCO (POHANG IRON AND STEEL COMPANY) (4,824 applications).
Source: EPO PATSTAT, worldwide filings
6 direct subcodes
Child Classifications
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- C21D 8/021 involving particular fabrication steps or treatments of ingots or slabs
- C21D 8/0221 characterised by the working steps
- C21D 8/0247 characterised by the heat treatment
- C21D 8/0278 involving a particular surface treatment (C21D8/0294 takes precedence)
- C21D 8/0294 involving a localised treatment
- C21D 8/04 to produce plates or strips for drawing, e.g. for deep-drawing
Top Applicants
Top 10 applicants by patent filingsfor 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