Intellectual Property Code
Section 145. Duration. - A certificate of registration shall remain in force for ten (10) years: Provided, That the registrant shall file a declaration of actual use and evidence to that effect, or shall show valid reasons based on the existence of obstacles to such use, as prescribed by the Regulations, within one (1) year from the fifth anniversary of the date of the registration of the mark. Otherwise, the mark shall be removed from the Register by the Office. (Sec. 12, R.A. No. 166a)