Ownership of the invention shall be claimed by the sending to the employee of a notice specifying the nature and scope of the rights that the employer intends to reserve for himself. 16. Any declaration or notification from either the employee or the employer shall be made by registered letter with advice of receipt, or by any other means whereby its receipt by the other party may be proved. The time limits for any declaration or notification from the employer or employee shall be suspended by the bringing of an action challenging the regularity of the declaration. The periods shall continue to run as from the date of notification of a judgment that has become res judicata. 17. The employee and employer shall share with each other any useful information on the invention concerned. They shall abstain from making any disclosure that would be liable to compromise either entirely or partly the rights conferred by this Law. 18. In the event of a dispute, the employee and employer shall abstain from any disclosure of the invention until the case has been ruled upon. Where one of the parties files a patent application in order to preserve his rights, he shall without delay convey copies of the documents constituting the filing to the other party. Chapter III The Patent Application 19. The patent application shall be filed in the form and on the conditions specified in this Chapter. Section 1 Filing of the Application 20. Any application for the grant of a patent shall be filed with the entity responsible for industrial property. Where the applicant is represented by an agent, a power of attorney executed under private seal shall be enclosed with the application. An applicant domiciled abroad shall appoint an agent established in Tunisia. The agent’s power of attorney shall specify the scope of his mandate. Unless otherwise specified, the power of attorney shall extend to all acts relating to the patent, including the notifications provided for in this Law but with the exception of cases of withdrawal or renunciation, which require a special power of attorney. Where there are two or more persons filing the same application, a joint agent shall be appointed. 21. The application shall comprise: — a request; — a description of the invention in duplicate; — one or more claims in duplicate specifying the novel feature or features of the invention; page 5/23