F23B 50/02 the fuel forming a column, stack or thick layer with the combustion zone at its bottom
Introduced: January 2006
Full Title
Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone > the fuel forming a column, stack or thick layer with the combustion zone at its bottom
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- COMBUSTION APPARATUS; COMBUSTION PROCESSES
- Subclass:
- METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
Filing statistics
IPC F23B 50/02 belongs to the parent subclass F23B, which recorded 9,943 patent applications worldwide between 2013 and 2023. Annual filings declined from 782 in 2013 to 671 in 2023 (-14%), peaking at 1,128 applications in 2020. The most active applicants in class F23 are GE (GENERAL ELECTRIC COMPANY) (2,124 applications), XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY (1,369 applications) and NINGBO FOTILE KITCHENWARE COMPANY (1,363 applications).
Source: EPO PATSTAT, worldwide filings
4 direct subcodes
Child Classifications
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- F23B 50/04 the movement of combustion air and flue gases being substantially transverse to the movement of the fuel
- F23B 50/06 the flue gases being removed downwards through one or more openings in the fuel-supporting surface
- F23B 50/08 with fuel-deflecting bodies forming free combustion spaces inside the fuel layer
- F23B 50/1 with the combustion zone at the bottom of fuel-filled conduits ending at the surface of a fuel bed
Top Applicants
Top 10 applicants by patent filingsfor class F23, 2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 2,124
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 1,369
- NINGBO FOTILE KITCHENWARE COMPANY 1,363
- SIEMENS DE 997
- UNITED TECHNOLOGIES CORPORATION (UTC) US 937
- GE (GENERAL ELECTRIC COMPANY) 898
- VATTI 815
- CHINESE ACADEMY OF SCIENCES 719
- RINNAI COMPANY 708
- MITSUBISHI HITACHI POWER SYSTEMS 670