DIFF Subgroup
F15B 21/06 Use of special fluids, e.g. liquid metal; Special adaptations of fluid-pressure systems, or control of elements therefor, to the use of such fluids
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 > Use of special fluids, e.g. liquid metal; Special adaptations of fluid-pressure systems, or control of elements therefor, to the use of such fluids
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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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