F22G SUPERHEATING OF STEAM
Introduced: September 1968
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- STEAM GENERATION
- Subclass:
- SUPERHEATING OF STEAM
Description
F22G covers apparatus and methods for raising steam temperature above saturation point to improve thermodynamic efficiency in steam power systems. This includes superheater designs using heat exchange surfaces, control mechanisms for superheat temperature regulation, and integration with boiler units. The classification encompasses both convective and radiant heat transfer superheaters, as well as systems for attemperation (cooling) of excessively superheated steam. Adjacent classes F22B (steam boiler construction) and F22D (steam generation plant control) address boiler design and plant-level regulation respectively.
Filing statistics
IPC subclass F22G recorded 5,188 patent applications worldwide between 2013 and 2023. Annual filings grew from 269 in 2013 to 630 in 2023 (+134%), peaking at 668 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
Related Keywords
4 direct subcodes
Child Classifications
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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