Proof of the exhibitor’s right, defined in Article L. 611-13, first paragraph, second indent b, shall be provided within four months of the filing date of the patent application in the form of a certificate issued during the exhibition by the authority responsible for ensuring the protection of industrial property at that exhibition and stating that the invention was actually exhibited there.
The certificate mentions the opening date of the exhibition and, where applicable, the date of the first disclosure of the invention if these two dates do not coincide. It is accompanied by documents enabling the invention to be identified, stamped as authentic by the aforementioned authority.