Obligation to use trademarks and legal effects of non-use

In this thesis, the obligation to use registered marks in the context of trademark law, the rationale behind it, the scope of this requirement and legal consequences of non-use of a trademark are deliberated. In the study, the obligation to use registered marks under the international agreements to which Turkey is a party, the legal cases arised from the Turkish Constitutional Court's annulment decision for the relevant articles of the Decree Law No:556, thr discussions on whether these annulment decisions might have any effect on the implementation of the new Industrial Property (IP) Code No:6769 and the broadened scope of obligation to use registered marks in the new IP Code are comprehensively discussed and also the problems that may likely occur and their available solutions are analyzed.