DIFF Subgroup
F15B 21/04 Special measures taken in connection with the properties of the fluid
Introduced: September 1968
Full Title
Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass > Special measures taken in connection with the properties of the fluid
IPC and CPC are identically structured here. All 6 subcodes exist in both systems.
IPC defines codes here since 2019.
Child Classifications
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- F15B 21/041 Removal or measurement of solid or liquid contamination, e.g. filtering since 2019 IPC+CPC Available in IPC and CPC
- F15B 21/044 Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding since 2019 IPC+CPC Available in IPC and CPC
- F15B 21/045 Compensating for variations in viscosity or temperature since 2019 IPC+CPC Available in IPC and CPC
- F15B 21/048 Arrangements for compressed air preparation, e.g. comprising air driers, air condensers, filters, lubricators or pressure regulators since 2019 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class F15,2013–2023, worldwide · Source: EPO PATSTAT
- ROBERT BOSCH DE 1,079
- SCHAEFFLER TECHNOLOGIES & COMPANY DE 980
- SMC CORPORATION JP 737
- HITACHI CONSTRUCTION MACHINERY COMPANY JP 674
- KYB CORPORATION JP 525
- CATERPILLAR US 461
- FESTO & COMPANY DE 451
- ZHEJIANG UNIVERSITY 448
- HITACHI CONSTRUCTION MACHINERY COMPANY 442
- XUZHOU HEAVY MACHINERY COMPANY 404
Top Applicants (CPC)
Class F15,2013–2023, worldwide · Source: EPO PATSTAT
- ROBERT BOSCH DE 1,281
- SMC CORPORATION JP 865
- HITACHI CONSTRUCTION MACHINERY COMPANY JP 814
- KYB CORPORATION JP 584
- SCHAEFFLER TECHNOLOGIES & COMPANY DE 536
- CATERPILLAR US 532
- FESTO & COMPANY DE 486
- JOHN DEERE US 419
- KAWASAKI HEAVY IND JP 368
- HAMILTON SUNDSTRAND US 368