CPC Main Group Additional Only
B22F 2201/00 Treatment under specific atmosphere
11 direct subcodes
Child Classifications
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- B22F 2201/01 Reducing atmosphere
- B22F 2201/02 Nitrogen
- B22F 2201/03 Oxygen
- B22F 2201/04 CO or CO2
- B22F 2201/05 Water or water vapour
- B22F 2201/10 Inert gases
- B22F 2201/20 Use of vacuum
- B22F 2201/30 Carburising atmosphere
- B22F 2201/32 Decarburising atmosphere
- B22F 2201/40 Metal compounds
- B22F 2201/50 air
Top Applicants
Top 10 applicants by patent filingsfor class B22, 2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 2,157
- HEWLETT-PACKARD DEVELOPMENT COMPANY US 1,633
- SIEMENS DE 1,267
- POSCO (POHANG IRON AND STEEL COMPANY) KR 1,124
- CHINESE ACADEMY OF SCIENCES 1,040
- UNITED TECHNOLOGIES CORPORATION (UTC) US 1,015
- JFE STEEL JP 884
- CENTRAL SOUTH UNIVERSITY 810
- HITACHI METALS JP 641
- SINTOKOGIO JP 624