(8) The patent owner shall be entitled to a fair compensation for the exploitation of his invention. The amount of the compensation shall be fixed on the basis of the economic value of the invention. He shall have the right to appeal against the compensation assessment, within 30 days of being notified the decision, before the Committee provided for in Article 36, in accordance with the rules and procedures prescribed by the Regulations. (9) The non-voluntary license shall lapse on the expiry of its duration. Nonetheless, the Patent Office may decide to terminate the non-voluntary license if the reasons which led to its grant cease to exist and are unlikely to reoccur; in which case, the procedure prescribed by the Regulations shall apply. (10) The patent owner may request the termination of the non-voluntary license before its expiry, if the reasons which led to its grant cease to exist and are unlikely to reoccur. (11) Where a non-voluntary license is terminated before its term, the legitimate interests of the licensee shall be taken into account. (12) The non-voluntary license may be terminated or its terms amended by the Patent Office, or upon a request from any interested party, if within two years after the grant of the non-voluntary license, the licensee fails to exploit the subject matter of the license or to meet his obligations as prescribed by the license. Article 25 Patents may be expropriated by decision of the competent Minister. subject to the approval of the ministerial committee referred to in Article 23. on grounds relating to national defense and in cases of emergency which the grant of a non-voluntary license is insufficient to counter. The expropriation may be limited to the right of exploitation only to satisfy the needs of the State. In all cases, the expropriation shall be against a fair compensation, to be assessed by the committee provided for in Article 36 and on the basis of the economic value of the patent at the time the expropriation decision is made. The expropriation decision shall be published in the Patent Gazette. The decision of the expropriation and that of the compensation 18