What is the function of international patent application?

An international patent application refers to a patent application filed by the applicant with the Patent Office of the Contracting State in accordance with the prescribed procedures when an invention is granted patent protection in the Contracting State of the Patent Cooperation Treaty (PCT). The main function of PCT is to simplify the previously established method of applying for invention patent protection in several countries, make it more effective and economical, and benefit the users of the patent system and the patent office that has the right to manage the system.