https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/india/general-information-about-5
Is India a member of the Patent Cooperation Treaty (PCT)?
Yes, India became a contracting state to the Patent Cooperation Treaty (PCT) on 7 December 1998. Since then it has been possible to designate India in international patent applications filed via the PCT route.
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