Manufacture of steel in electric furnaces (; electric heating per se H05B)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Manufacture of steel in electric furnaces

CPC: Manufacture of steel in electric furnaces (; electric heating per se H05B)

Full Title

Full titles differ between systems:

IPC:

Manufacture of carbon steel, e.g. plain mild steel, medium carbon steel, or cast-steel > Manufacture of steel in electric furnaces

CPC:

Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel > Manufacture of steel in electric furnaces (; electric heating per se H05B)

CPC subdivides this area 11x more granularly than IPC with 10 additional codes.

10 codes are CPC-only extensions.

Child Classifications

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C21C 2005/5258 2nd only CPC only CPC only
C21C 2005/5288 2nd only CPC only CPC only
C21C 5/5205 CPC only CPC only
C21C 5/5211 +2 CPC CPC only CPC only
C21C 5/5229 +1 CPC CPC only CPC only
C21C 5/5241 +1 CPC CPC only CPC only
C21C 5/5252 CPC only CPC only
C21C 5/5264 CPC only CPC only
C21C 5/527 +2 CPC CPC only CPC only
C21C 5/5294 CPC only CPC only
C21C 5/54 Processes yielding slags of special composition 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