Dirigible balloon rigidified by helium tanks
Patent 6739549 Issued on May 25, 2004. Estimated Expiration Date: 
November 12, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 12, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1900743 3032298 3443776 3559920 Semi-buoyant aircraft Variable geometry airship Patent #: 5005783 InventorAssigneeApplicationNo. 10276021 filed on 11/12/2002US Classes:244/24, AIRCRAFT, LIGHTER-THAN-AIR244/30, Airships244/31, Balloons244/128Airship gas cell construction and arrangementExaminersPrimary: Eldred, J. WoodrowAttorney, Agent or FirmForeign Patent References
International ClassB64B 102AbstractA variable-lift device using a helium to fly. The device comprises a balloon (1) composed of an outer flexible envelope (3) supported by a rigid structure. The rigid structure comprises a plurality of hollow toruses (4) of inside volume that acts as a tank for storing helium under pressure. | |
