CPC Main Group Additional Only
F23N 2221/00 Pretreatment or prehandling
6 direct subcodes
Child Classifications
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- F23N 2221/02 using belt conveyors
- F23N 2221/04 Preheating liquid fuel
- F23N 2221/06 Preheating gaseous fuel
- F23N 2221/08 Preheating the air
- F23N 2221/10 Analysing fuel properties, e.g. density, calorific
- F23N 2221/12 Recycling exhaust gases
Top Applicants
Top 10 applicants by patent filingsfor class F23, 2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 2,581
- UNITED TECHNOLOGIES CORPORATION (UTC) US 1,180
- SIEMENS DE 1,157
- GE (GENERAL ELECTRIC COMPANY) 994
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 769
- MITSUBISHI HEAVY INDUSTRIES JP 701
- MITSUBISHI HITACHI POWER SYSTEMS JP 695
- RAYTHEON TECHNOLOGIES CORPORATION US 587
- NINGBO FOTILE KITCHENWARE COMPANY 543
- GENERAL ELECTRIC TECHNOLOGY CH 490