CPC Main Group
F22B 9/00 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
Filing statistics
CPC F22B 9/00 belongs to the parent subclass F22B, which recorded 24,387 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,821 in 2013 to 2,125 in 2023 (+17%), peaking at 2,634 applications in 2017. The most active applicants in class F22 are XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY (544 applications), SIEMENS (306 applications) and PHILIP MORRIS PRODUCTS (258 applications).
Source: EPO PATSTAT, worldwide filings
4 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- F22B 9/02 the boiler body being disposed upright, e.g. above the combustion chamber
- F22B 9/10 the boiler body being disposed substantially horizontally, e.g. at the side of the combustion chamber
- F22B 9/16 the boiler body containing fire tubes disposed crosswise in inclined upward arrangement
- F22B 9/18 Component parts thereof; Accessories therefor, e.g. stay-bolt connections
Top Applicants
Top 10 applicants by patent filingsfor class F22, 2013–2023, worldwide · Source: EPO PATSTAT
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 544
- SIEMENS DE 306
- PHILIP MORRIS PRODUCTS CH 258
- GENERAL ELECTRIC TECHNOLOGY CH 254
- MITSUBISHI HITACHI POWER SYSTEMS JP 235
- XIAN JIAOTONG UNIVERSITY 214
- MITSUBISHI HEAVY INDUSTRIES JP 195
- MITSUBISHI HITACHI POWER SYSTEMS 169
- HARBIN BOILER COMPANY 166
- VALMET TECHNOLOGIES FI 155