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Patents > National tech categories: FR 6.4 & IPCs: IPC B64C23/00 & Number of claims: 4-40

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Airplane (11) · hybrid (11) · None (9) · Propulsion (8) · Helicopter (7) · Design (5) · Frame (5) · Ascension (5) · Propellers (4) · Lift (4) · Construction (3) · heavier-than-air (3) · takeoff (3) · propeller (3) · gyroscope (2) · stability (2) · whole (2) · LTA? (2) · sustentation (2)
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Showing below up to 29 results in range #1 to #29.

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