Patents

A patent is a set of exclusive rights granted by a sovereign state to an inventor or their assignee for a l limited period of time, in exchange for the public disclosure of the invention.An invention is a solution to a specific technological problem, and may be a product or a process.
Here below some patents related to the topic that i have developed:

• Steerable aereostatic ballon 19/06/1986, Regipa Robert,Toulouse(Fr).
• Structure of hot air ballon 20/10/1970, L.F.Harding Bloomfields Hills (U.S.A.)
• Fire balloon 08/08/1882,G.A.Lilliendahl,Jersey city (U.S.A.).
• Elevated railway 13/11/1888 R.T.Oney Charlleston (U.S.A.)

another patens  is this by Ed Yost , 05/05/1964,South Dakota(U.S.A.):

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