IPC Main Group
F22B 33/00 Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- STEAM GENERATION
- Subclass:
- METHODS OF STEAM GENERATION; STEAM BOILERS
Filing statistics
IPC F22B 33/00 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
Additional Content
Arrangements or dispositions of steam-generation plants in marine vessels
4 direct subcodes
Child Classifications
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- F22B 33/02 Combinations of boilers having a single combustion apparatus in common
- F22B 33/12 Self-contained steam boilers, i.e. comprising as a unit the steam boiler, the combustion apparatus, the fuel storage, accessory machines, and equipment
- F22B 33/14 Combinations of low- and high-pressure boilers
- F22B 33/18 Combinations of steam boilers with other apparatus
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