Article 18
(1) Oppositions concerning a trademark application that was published in the Bulletin should not be registered in accordance with Articles 5 or 6, shall be filed by relevant persons within two months following the publication of the trademark application.
(2) The opposition shall be made to the Office in writing and with grounds. If the grounds for opposition are not submitted to the Office within the period set out in the first paragraph, the opposition shall be deemed not to have been made. In order for the examination of the opposition, it is mandatory that the opposition fee is paid within the period of the opposition and that the information regarding the payment of the fee is submitted to the Office within the same period.