CPC Main Group Additional Only
C21D 2201/00 Treatment for obtaining particular effects
5 direct subcodes
Child Classifications
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- C21D 2201/01 Shape memory effect
- C21D 2201/02 Superplasticity
- C21D 2201/03 Amorphous or microcrystalline structure
- C21D 2201/04 Single or very large crystals
- C21D 2201/05 Grain orientation
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