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| Number | Title | Issue Date |
| 7264202 | Tri-cycloidal airship An unmanned, lighter-than-air airship includes three omnidirectional thrust generating units. One unit is mounted at the fore-end of the airship to generate thrust in a plane that is perpendicular to the longitudinal axis of the airship. This unit controls pitch and... | 09/04/2007 |
| 6402090 | Balloon trajectory control system A device to provide control of the trajectory of a lighter than air vehicle, such as a balloon, is provided. A lifting device, such as a wing on end, is suspended on a tether well below the balloon to take advantage of the natural variation in winds at di... | 06/11/2002 |
| 4482110 | Cyclorotor composite aircraft A composite aircraft comprising a system of airfoils rotating about a horizontal axis providing lift and thrust in combination with a lighter-than-air gas containment bag providing bouyant lift; said aircraft being capable of lifting and transporting a lo... | 11/13/1984 |
