14 No. 10 Right conferred by patent. 22. (1) The owner of the patent has the right to prevent any person from exploiting the protected invention by any of the following acts:- Patents and Industrial Designs Act 2012 (a) � where the patent has been granted in respect of a product(i) �making, importing, offering for sale, selling and using the product; (ii) �stocking such product for the purposes of offering for sale, selling or using the product; (b) � where the patent has been granted in respect of a process(i) �using the process; or (ii) �doing any of the acts referred to in paragraph (a) in respect of a product obtained directly by means of the process. (2) The owner of the patent shall, in addition to any other rights, remedies or actions available to him, have the right, subject to section 23 to institute legal proceedings against any person who infringes the patent by performing, without his agreement, any of the acts referred to in subsection (1) or who performs acts which make it likely that infringement will occur. Limitation of rights. 23. (1) The rights under the patent shall not extend(a) � to acts in respect of articles which have been put on the market in any country by the owner of the patent or with his consent; or No. 10 Patents and Industrial Designs Act 2012 15 (b) � to the use of articles on aircraft, land vehicles or vessels of other countries which temporarily or accidentally enter the airspace, territory or waters of Sierra Leone; (c) � to acts done only for experimental purposes relating to a patented invention; or (d) � to acts performed by any person who in good faith, before the filing or, where priority is claimed, the priority date of the application on which the patent is granted in Sierra Leone, and was using the invention or was making effective and serious preparations for such use. (2) � The right of prior user referred to in paragraph (d) of subsection (1) may be transferred or devolved only together with the enterprise or business, or with that part of the enterprise or business, in which the use or preparations for use have been made. 24. Subject to section 25, a patent shall expire twenty years Duration of patent. after the filing date of the application for the patent. 25. (1) In order to maintain the patent or patent application, Annual fees. an annual fee shall be paid in advance to the Registrar for each year, starting one year after the filing date of the application for grant of the patent. (2) A period of grace of six months shall be allowed for the late payment of the annual fee on payment of the prescribed surcharge.