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31 month time limit,
Korean language and Power of Attorney
PCT national filing in Korea should be filed to the Korean Intellectual Property Office (KIPO) within 31 months from the prior date. KIPO does not allow the applicant to file a patent application in foreign languages, thus only a Korean specification is acceptable. Therefore, you need to translate PCT publication into Korea before filing. As of January 1, 2015, you can file a Korean translation of the publication after one month from the 31 month deadline on request.

You need a Power of Attorney duly signed by the applicant. Notarization or legalization is not needed.