DIFF Subgroup
F22D 1/04 the tubes having plain outer surfaces, e.g. in vertical arrangement
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Feed-water heaters, e.g. preheaters > with water tubes arranged in the boiler furnaces, fire tubes or flue ways > the tubes having plain outer surfaces, e.g. in vertical arrangement
CPC:
Feed-water heaters, i.e. economisers or like preheaters > with water tubes arranged in the boiler furnaces, fire tubes or flue ways > the tubes having plain outer surfaces, e.g. in vertical arrangement
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
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