Territorial extension refers to the special application for protection submitted by the applicant or owner of an internationally registered trademark to the member states of the "Madrid Union". International trademark registration can only be protected within the designated member states of the "Madrid Union" if it extends its territory.

According to the provisions of Article 3ter(2) of the Treaty of Madrid:

Any claim for territorial extension made after international registration must be in accordance with the provisions of the Regulations. format, submitted through the registration authority of the country of origin. The International Bureau shall immediately notify such request to the registration authority without delay and shall publish it in a periodical journal issued by the International Bureau. This territorial extension takes effect from the date of registration in the International Register and ceases to be effective when the international registration of the relevant trademark expires.

Territorial extension can be divided into two types. First, when applying for a new international registration, the applicant simultaneously points it out, that is, when filling out the application form, the country requiring protection is specified; second, after international registration, the registrant hopes to obtain protection from other member states. This is At that time, the registrant can apply for territorial extension to the Trademark Office again (this situation is called subsequent designation). Regardless of which territorial extension the protection is obtained, its effect is exactly the same as if the trademark application were filed directly in that country.