CPC Subgroup Additional Only
F15B 2211/3105 Neutral or centre positions
Full Title
Circuits for servomotor systems > Directional control > characterised by the positions of the valve element > Neutral or centre positions
2 direct subcodes
Child Classifications
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- F15B 2211/3111 the pump port being closed in the centre position, e.g. so-called closed centre
- F15B 2211/3116 the pump port being open in the centre position, e.g. so-called open centre
Top Applicants
Top 10 applicants by patent filingsfor 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