High altitude reconnaissance platform
Patent 4697761 Issued on October 6, 1987. Estimated Expiration Date: 
September 16, 2005. 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.
September 16, 2005. 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 1058983 1839194 Atmospheric exploration vehicle Solar powered aircraft Patent #: 4415133 InventorApplicationNo. 06/776425 filed on 09/16/1985US Classes:244/62, AIRCRAFT PROPULSION244/45R, Arrangement244/53R, AIRCRAFT POWER PLANTS244/58AuxiliaryExaminersPrimary: Peters, Joseph F. Jr.Assistant: Corl, Rodney Attorney, Agent or FirmInternational ClassesB64D 27/24 (20060101)B64D 27/00 (20060101) AbstractA high altitude, ultra lightweight aircraft has broad area relatively flat wings, and is provided with solar cells on its upper wing surfaces, and long wavelength, infrared responsive cells on its lower wing and fuselage surfaces, to provide enough power to maintain the aircraft aloft at high altitudes indefinitely. The aircraft is intended to fly at altitudes of about 60,000 feet to 110,000 feet, at speeds in the vicinity of 70 to 200 miles per hour. A battery or fuel cell and electrical system is provided to store excess electrical power and to supply electrical power when needed. A large, low speed, pusher propellor is driven by an electrical motor. The aircraft may be launched with an opaque balloon, which not only raises the aircraft to the desired elevation but also conceals it.Other References
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