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International patent application is effective in all designated PCT states. There IS no need of paying fee for each country. Only a single set of fees for filling your international patent application in the receiving office. Filling, searching, publication are payable at the receiving office.Natioanl fees in the designated states becomes payable much later because national processing is delayed if we use PCT.

In several countries and the European patent office, national fees are very lower for international patent application than they would be you filled separate applications.

An International patent application has two phases. The first phase is the international phase in which patent protection is pending under a single patent application filed with the patent office of a contracting state of the PCT.

The second phase is the national and regional phase which follows the international phase in which rights are continued by filing necessary documents with the patent offices of separate contracting states of the PCT.

An International patent application designating India shall be treated as an application for patent under the Act. The advantages that are offered by filing an "international" patent application under the Patent Cooperation Treaty (the "PCT"). By filing one international patent application under the PCT, and designating any or all of the PCT Contracting States, you can simultaneously seek patent protection for an invention in each of a large number of countries.