Intellectual Property Code
Section 140. Cancellation upon Application by Registrant; Amendment or Disclaimer of Registration. - Upon application of the registrant, the Office may permit any registration to be surrendered for cancellation, and upon cancellation the appropriate entry shall be made in the records of the Office. Upon application of the registrant and payment of the prescribed fee, the Office for good cause may permit any registration to be amended or to be disclaimed in part: Provided, That the amendment or disclaimer does not alter materially the character of the mark. Appropriate entry shall be made in the records of the Office upon the certificate of registration or, if said certificate is lost or destroyed, upon a certified copy thereof (Sec. 14, R.A. No. 166)