CPC Main Group
F23J 11/00 Devices for conducting smoke or fumes, e.g. flues (chimney stacks E04H12/28; removing cooking fumes from domestic stoves or ranges F24C15/20 )
5 direct subcodes
Child Classifications
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- F23J 11/02 for conducting smoke or fumes originating from various locations to the outside, e.g. in locomotive sheds, in garages
- F23J 11/04 in locomotives; in road vehicles; in ships
- F23J 11/08 for portable apparatus
- F23J 11/10 for tents; for log huts; for other inflammable structures
- F23J 11/12 Smoke conduit systems for factories or large buildings
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