The notifications provided for in Chapters II, III and IV of this Title shall be made by registered letter with acknowledgement of receipt.
Registered mail may be replaced by delivery of the letter to the addressee, against receipt, on the premises of the National Institute of Industrial Property or by a message in electronic form in accordance with the procedures laid down by the Director General of the Institute to guarantee in particular the security of the dispatch.
If the address of the addressee is unknown, notification shall be made by publication of a notice in the Official Bulletin of Industrial Property.