DIFF Subgroup
F23N 3/04 by operation of single valves or dampers by temperature sensitive elements
Introduced: September 1968
Title
Titles differ between systems:
IPC: by operation of single valves or dampers by temperature-sensitive elements
CPC: by operation of single valves or dampers by temperature sensitive elements
Full Title
Full titles differ between systems:
IPC:
Regulating air supply or draught > by operation of single valves or dampers by temperature-sensitive elements
CPC:
Regulating air supply or draught (conjointly with fuel supply F23N1/00) > by operation of single valves or dampers by temperature sensitive elements
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.
Child Classifications
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Top Applicants
Top Applicants (IPC)
Class F23,2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 2,124
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 1,369
- NINGBO FOTILE KITCHENWARE COMPANY 1,363
- SIEMENS DE 997
- UNITED TECHNOLOGIES CORPORATION (UTC) US 937
- GE (GENERAL ELECTRIC COMPANY) 898
- VATTI 815
- CHINESE ACADEMY OF SCIENCES 719
- RINNAI COMPANY 708
- MITSUBISHI HITACHI POWER SYSTEMS 670
Top Applicants (CPC)
Class F23,2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 2,581
- UNITED TECHNOLOGIES CORPORATION (UTC) US 1,180
- SIEMENS DE 1,157
- GE (GENERAL ELECTRIC COMPANY) 994
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 769
- MITSUBISHI HEAVY INDUSTRIES JP 701
- MITSUBISHI HITACHI POWER SYSTEMS JP 695
- RAYTHEON TECHNOLOGIES CORPORATION US 587
- NINGBO FOTILE KITCHENWARE COMPANY 543
- GENERAL ELECTRIC TECHNOLOGY CH 490