CPC Subgroup Additional Only
F23G 2203/20 Rotary drum furnace
Full Title
Furnace arrangements > Rotary drum furnace
Filing statistics
CPC F23G 2203/20 belongs to the parent subclass F23G, which recorded 27,613 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,188 in 2013 to 2,441 in 2023 (+105%), peaking at 3,992 applications in 2020. The most active applicants in class F23 are GE (GENERAL ELECTRIC COMPANY) (2,581 applications), UNITED TECHNOLOGIES CORPORATION (UTC) (1,180 applications) and SIEMENS (1,157 applications).
Source: EPO PATSTAT, worldwide filings
12 direct subcodes
Child Classifications
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- F23G 2203/201 using oscillating movement
- F23G 2203/202 rotating around substantially vertical axis
- F23G 2203/203 with conically shaped drum
- F23G 2203/204 having non-circular inner cross-section
- F23G 2203/205 with water-cooled wall
- F23G 2203/206 with charging ports in the sidewall
- F23G 2203/207 with air supply ports in the sidewall
- F23G 2203/208 with interior agitating members
- F23G 2203/209 with variable inclination of rotation axis
- F23G 2203/21 with variable speed of rotation
- F23G 2203/211 Arrangement of a plurality of drums
- F23G 2203/212 Sealing arrangements between rotary and stationary parts
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