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The Soleau envelope (French: Enveloppe Soleau), named after its French inventor, , is a sealed envelope serving as proof of priority for inventions valid in France, exclusively to precisely ascertain the date of an invention, idea or creation of a work. It can be applied for at the French National Institute of Industrial Property (INPI). The working principles were defined in the ruling of May 9, 1986, published in the official gazette of June 6, 1986 (Journal officiel de la République française or JORF), although the institution of the Soleau envelope dates back to 1915.