F22B 37/54 De-sludging or blow-down devices
Introduced: September 1968
Full Title
Full titles differ between systems:
Component parts or details of steam boilers > applicable to more than one kind or type of steam boiler > Devices or arrangements for removing water, minerals or sludge from boilers > De-sludging or blow-down devices
Component parts or details of steam boilers > applicable to more than one kind or type of steam boiler > Devices or arrangements for removing water, minerals or sludge from boilers (cleaning water tubes, furnace tubes or the like of boilers F28G) > De-sludging or blow-down devices
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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Top Applicants
Top Applicants (IPC)
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
Top Applicants (CPC)
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