https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/korea/after-grant/when-do-i-have-pay
When do I have to pay annual fees in Korea?
In Korea the annual fees for the first three years have to be paid in a lump sum within three months as from the grant decision. Subsequent annual fees are payable yearly in advance on the anniversary of the first payment.
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