https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/taiwan-province-china/general-4
Is Taiwan, Province of China a member of the Patent Cooperation Treaty (PCT)?
No, Taiwan, Province of China (TW) is not a party to any international patent-related treaty such as the PCT or the Paris Convention. It is therefore not possible to file applications under these treaties.
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