CPC Subgroup
F01D 11/20 Actively adjusting tip-clearance
Full Title
Preventing or minimising internal leakage of working-fluid, e.g. between stages (sealings in general F16J ) > for sealing space between rotor blade tips and stator (specially-shaped blade tips therefor F01D5/20) > Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing (rotors with blades adjustable in operation F01D7/00) > Actively adjusting tip-clearance
2 direct subcodes
Child Classifications
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- F01D 11/22 by mechanically actuating the stator or rotor components, e.g. moving shroud sections relative to the rotor
- F01D 11/24 by selectively cooling-heating stator or rotor components
Top Applicants
Top 10 applicants by patent filingsfor class F01, 2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 9,989
- UNITED TECHNOLOGIES CORPORATION (UTC) US 8,110
- SAFRAN AIRCRAFT ENGINES FR 6,248
- HYUNDAI MOTOR COMPANY KR 4,530
- SIEMENS DE 4,461
- FORD GLOBAL TECHNOLOGIES US 4,029
- RAYTHEON TECHNOLOGIES CORPORATION US 3,947
- TOYOTA MOTOR CORPORATION JP 3,734
- GE (GENERAL ELECTRIC COMPANY) 3,415
- SCHAEFFLER TECHNOLOGIES & COMPANY DE 3,063