IPC Subgroup
C22C 38/18 containing chromium
Introduced: July 1974
Last revised: January 2006
Full Title
Ferrous alloys, e.g. steel alloys > containing chromium
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- Subclass:
- ALLOYS
11 direct subcodes
Child Classifications
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- C22C 38/2 with copper
- C22C 38/22 with molybdenum or tungsten
- C22C 38/24 with vanadium
- C22C 38/26 with niobium or tantalum
- C22C 38/28 with titanium or zirconium
- C22C 38/3 with cobalt
- C22C 38/32 with boron
- C22C 38/34 with more than 1.5% by weight of silicon
- C22C 38/36 with more than 1.7% by weight of carbon
- C22C 38/38 with more than 1.5% by weight of manganese
- C22C 38/4 with nickel
Top Applicants
Top 10 applicants by patent filingsfor class C22, 2013–2023, worldwide · Source: EPO PATSTAT
- JFE STEEL JP 7,152
- NIPPON STEEL CORPORATION JP 5,416
- POSCO (POHANG IRON AND STEEL COMPANY) KR 4,530
- JFE STEEL 3,986
- CENTRAL SOUTH UNIVERSITY 3,086
- NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,843
- CHINESE ACADEMY OF SCIENCES 2,702
- ARCELORMITTAL LU 2,124
- NSSMC (NIPPON STEEL & SUMITOMO METAL) 2,075
- KOBE STEEL JP 1,891