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| Number | Title | Issue Date |
| 5303879 | Aircraft with a ducted fan in a circular wing The aircraft comprises a rotor with a vertical axis arranged in a housing for generating a lift exceeding the weight of the aircraft. The housing is essentially shaped as a circular wing. A first way of guiding air is provided for controlling the air stre... | 04/19/1994 |
| 5064143 | Aircraft, having a pair of counter rotating rotors The aircraft has a pair of rotors driven to counter-rotate within a housing. The housing has adjustable air guiding discuss for the rotor stream and a airfoil-like outer shape to generate lift at horizontal flight. The air guiding devices include a circul... | 11/12/1991 |
