IPC Subgroup
F22B 21/34 built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
Introduced: September 1968
Last revised: January 2006
Full Title
Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically > built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- STEAM GENERATION
- Subclass:
- METHODS OF STEAM GENERATION; STEAM BOILERS
2 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- F22B 21/36 involving an upper drum or headers mounted at the top of the combustion chamber
- F22B 21/38 Component parts thereof, e.g. prefabricated panels
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