There are two ways to apply for a patent overseas: either by applying directly to a foreign country
or by using the Patent Cooperation Treaty (PCT) international application system.
Direct Application to a Foreign Country
How to apply for the application directly to the relevant national patent office through the attorney of the country with an application and statement in the language of the country you wish to apply for
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The Patent Cooperation Treaty (PCT) International Application System
How to make an international application through the PCT route to save time, money,
and effort when an applicant makes an international application
*Patent registration be obtained in each country
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Disadvantage