4. Aeronautics and astronautics
  5. Aircraft, heavier-than-air
  6. Helicopter or auto-rotating wing sustained, i.e., gyroplanes

Friedrich K. Straub

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Active blowing system for rotorcraft vortex interaction noise re

Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent

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Helicopter in-flight rotor tracking system, method, and...

Power plants – Motor operated by expansion and/or contraction of a unit of... – Mass is a solid
Reexamination Certificate

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Helicopter in-flight rotor tracking system, method, and...

Fluid reaction surfaces (i.e. – impellers) – Method of operation
Reexamination Certificate

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Helicopter rotor blade flap actuator government interest

Fluid reaction surfaces (i.e. – impellers) – With means moving working fluid deflecting working member...
Patent

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Oscillating air jets for helicopter rotor aerodynamic control an

Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Pressure or altitude responsive
Patent

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