Is a patent obtained domestically also effective abroad?

Where a patent application is filed and registration is obtained, the patent right has exclusive and exclusionary effect only domestically, in accordance with the principle of territoriality. Therefore, in order to exercise a patent right abroad, you must file an application and obtain registration in the relevant country.

An overseas patent application

(1) may be filed directly by the applicant appointing an agent (patent attorney) in accordance with the national law of the relevant country, or
(2) there is a method of filing with the KIPO (Korean Intellectual Property Office) under the international application procedure pursuant to the Patent Cooperation Treaty and designating the countries in which registration is desired.