DIFF Subgroup
F22D 5/26 Automatic feed-control systems
Introduced: September 1968
Full Title
Controlling water feed or water level; Automatic water feeding or water-level regulators > Automatic feed-control systems
IPC and CPC are identically structured here. All 5 subcodes exist in both systems.
Child Classifications
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- F22D 5/28 responsive to amount of steam withdrawn; responsive to steam pressure IPC+CPC Available in IPC and CPC
- F22D 5/30 responsive to both water level and amount of steam withdrawn or steam pressure IPC+CPC Available in IPC and CPC
- F22D 5/32 influencing the speed or delivery pressure of the feed pumps IPC+CPC Available in IPC and CPC
- F22D 5/36 for feeding a number of steam boilers designed for different ranges of temperature and pressure IPC+CPC Available in IPC and CPC
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