CPC Subgroup
F22B 37/06 Flue or fire tubes; Accessories therefor, e.g. fire-tube inserts
Full Title
Component parts or details of steam boilers > applicable to more than one kind or type of steam boiler > Flue or fire tubes; Accessories therefor, e.g. fire-tube inserts
1 direct subcode
Child Classifications
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- F22B 37/08 Fittings preventing burning-off of the tube edges
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