CPC Main Group
C21B 7/00 Blast furnaces (lifts associated with blast furnaces B66B9/06)
12 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- C21B 7/02 Internal forms
- C21B 7/04 with special refractories (refractory materials C04B)
- C21B 7/08 Top armourings
- C21B 7/10 Cooling; Devices therefor
- C21B 7/12 Opening or sealing the tap holes
- C21B 7/14 Discharging devices, e.g. for slag
- C21B 7/16 Tuyéres
- C21B 7/18 Bell-and-hopper arrangements
- C21B 7/22 Dust arresters
- C21B 7/24 Test rods or other checking devices
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