4 (2) Where a third party proceeded, in Egypt, in good faith, with the making of a product or use of a process or made serious preparations for such activities prior to the date of an application for patent by another person for the same product or process. The former shall, notwithstanding the grant of patent, have the right to continue with such activities only within his enterprise and without extending the scope of those activities. Such right shall not be assigned or transferred without the other elements of the enterprise. (3) Indirect uses of the production process, subject of the invention, in order to obtain other products. (4) Use of the invention on a land vehicle, vessel or aircraft belonging to a country or entity member of the World Trade Organisation, or a country that applies reciprocity to Egypt, when such a land vehicle, vessel or aircraft is temporarily or accidentally present in Egypt. (5) Where a third party proceeds, during the protection period of a product, with its manufacturing, assembly, use or sale, with a view to obtain a marketing license, provided that, the marketing starts after the expiry of such a protection period. (6) Any other acts by third parties, provided that they shall not unreasonably hamper the normal exploitation of the patent, and shall not be unreasonably prejudicial to the legitimate interests of the patent owner taking into consideration the legitimate interests of others. Article 11 A fee shall be paid on filing a patent application. A progressive annual fee shall also be paid as of the second year until the expiration of the patent protection period. The amount of such fees to be determined in the Regulations shall not exceed 2,000 pounds for the initial application or 1,000 pounds for the annual fee. Cases for the reduction or waiver of these fees shall also be prescribed in the Regulations. The patent applicant shall pay the fees of experts called upon by the Patent Office as well as examination costs. Article 12 The patent application shall be filed by the inventor or his successor in title with the Patent Office, in accordance with the terms and conditions prescribed by the Regulations. An application may not contain more than one invention. A group of inventions so linked as to form an integrated inventive concept shall be considered as one invention. Article 13 The patent application shall be accompanied by a detailed description of the invention, including a full statement of the subject matter and of the best way to enable a person of expertise to execute it, and of each product or method for which protection is sought.