Descaling by thermal stresses (mechanically B21, B23; chemically C23; electrolytically C25F1/00)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Descaling by thermal stresses

CPC: Descaling by thermal stresses (mechanically B21, B23; chemically C23; electrolytically C25F1/00)

Full Title

Full titles differ between systems:

IPC:

General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > Descaling by thermal stresses

CPC:

General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > Descaling by thermal stresses (mechanically B21, B23; chemically C23; electrolytically C25F1/00)

No child classifications to compare. This is a leaf node in both 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