involving a localised treatment

Introduced: January 2026

Full Title

Full titles differ between systems:

IPC:

Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment > during manufacturing of articles with special electromagnetic properties > involving a localised treatment

CPC:

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 articles with special electromagnetic properties > involving a localised treatment

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