Drilldown: Patents

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Patents > IPCs : IPC B64C27/04 or IPC B64C31/00 & Number of claims: 4-6

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helicopter (14) · kite (6) · propulsion (6) · hybrid (6) · airplane (5) · propeller (5) · parachute (4) · None (4) · ascension (4) · sustentation (3) · propellers (3) · lift (3) · stability (3) · HTA (3) · fun (3) · frame (3) · pendulum (2) · human-powered (2) · steering (2) · sail (2)
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