CPC Subgroup
F22B 27/04 built-up from water tubes (F22B27/12 - F22B27/16 take precedence)
Full Title
Instantaneous or flash steam boilers > built-up from water tubes (F22B27/12 - F22B27/16 take precedence)
3 direct subcodes
Child Classifications
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- F22B 27/06 bent in serpentine or sinuous form
- F22B 27/08 bent helically, i.e. coiled
- F22B 27/10 bent spirally
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