CPC Main Group
F22B 3/00 Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
Filing statistics
CPC F22B 3/00 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
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- F22B 3/02 involving the use of working media other than water
- F22B 3/04 by drop in pressure of high-pressure hot water within pressure-reducing chambers, e.g. in accumulators
- F22B 3/06 by transformation of mechanical, e.g. kinetic, energy into heat energy
- F22B 3/08 at critical or supercritical pressure values
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