F22B 9/1 the boiler body being disposed substantially horizontally, e.g. at the side of the combustion chamber
Introduced: September 1968
Last revised: January 2006
Full Title
Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body > the boiler body being disposed substantially horizontally, e.g. at the side of the combustion chamber
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- STEAM GENERATION
- Subclass:
- METHODS OF STEAM GENERATION; STEAM BOILERS
Filing statistics
IPC F22B 9/1 belongs to the parent subclass F22B, which recorded 46,730 patent applications worldwide between 2013 and 2023. Annual filings grew from 2,854 in 2013 to 4,965 in 2023 (+74%), peaking at 5,724 applications in 2020. The most active applicants in class F22 are XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY (922 applications), MIURA COMPANY (416 applications) and HARBIN BOILER COMPANY (390 applications).
Source: EPO PATSTAT, worldwide filings
1 direct subcode
Child Classifications
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- F22B 9/12 the fire tubes being in substantially-horizontal arrangement
Top Applicants
Top 10 applicants by patent filingsfor class F22, 2013–2023, worldwide · Source: EPO PATSTAT
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 922
- MIURA COMPANY 416
- HARBIN BOILER COMPANY 390
- MITSUBISHI HITACHI POWER SYSTEMS 303
- XIAN JIAOTONG UNIVERSITY 287
- SGCC(STATE GRID CORPORATION OF CHINA) 257
- HUADIAN ELECTRIC POWER RESEARCH INSTITUTE 253
- SIEMENS DE 247
- MIDEA 243
- NORTH CHINA ELECTRIC POWER UNIVERSITY 223