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National Phase Application<br>A national phase application is a stage in the process of obtaining a patent in a foreign country.<br><br>A national phase application is a stage in the process of obtaining a patent in a foreign country.<br>When a patent application is filed under the Patent Cooperation Treaty (PCT), it is initially filed with an international application receiving office (ARO).<br>The international application is then subjected to a formalities examination by an International Searching Authority (ISA), which provides an international search report (ISR) and a written opinion on patentability.<br>
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