https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/korea/filing-grant/can-i-apply
Can I apply for a patent and a utility model at the same time in Korea?
No, this is no longer possible. Prior to 1 October 2006, it was possible to file patent and utility-model applications in parallel in order to get early protection for an invention. The registered utility model then had to be withdrawn when the patent was granted. However, this system has now been abolished.
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