CPC Main Group
F22B 35/00 Control systems for steam boilers (for regulating feed-water supply F22D5/00; for controlling superheat temperature F22G5/00)
9 direct subcodes
Child Classifications
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- F22B 35/02 for steam boilers with natural convection circulation
- F22B 35/06 for steam boilers of forced-flow type
- F22B 35/18 Applications of computers to steam-boiler control
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