Korean Patent Prosecution Timing: Examination and Response Periods
The duration of Korean patent prosecution depends on when examination is requested, the first-action queue for the technical field, the number of office actions, applicant response time, and eligibility for preferential examination. A filing-date estimate should therefore state its assumptions rather than give a fixed grant date.
Examination request
Substantive examination does not begin automatically at filing. An examination request and the applicable fee are required. For patent applications filed on or after March 1, 2017, the request must generally be filed within three years from the application date. For a PCT national-phase application, the period is calculated from the international filing date.
An examination request filed with the application starts the queue earlier. A later request may defer cost and permit additional commercial or foreign-prosecution information to develop. The three-year deadline should be docketed separately from the national filing or entry deadline.
Publication and first examination result
A patent application is generally published about 18 months from the filing date or earliest priority date. Publication and examination are separate events.
The Ministry’s 2024 Annual Report recorded an average first-action pendency of 16.1 months for patents and utility models. Its February 2026 examination plan set a target of reducing the average patent waiting period to 14 months by the end of 2026. Both figures are measured from the examination request and describe an overall average or target, not an individual case deadline.
Timing varies among software, semiconductor, mechanical, chemical, biotechnology, and other examination groups. The forecast should identify the filing-to-examination-request period separately from the expected wait after the request.
Office action response periods
If the examiner identifies a ground for rejection, the notice may address novelty, inventive step, clarity, support, unity, or a formal requirement. Since July 11, 2025, the designated response period for a patent notice of grounds for rejection is up to four months. The notice states the controlling deadline, and fee-based extensions may be requested under the applicable rules.
After reviewing the response, the examiner may allow the application, issue another notice, or issue a final rejection. Each additional examination round includes time for internal instruction, preparation of Korean arguments and amendments, and examiner review.
Preferential examination and PPH
Preferential examination is available only when the application falls within a prescribed category and the required evidence is submitted. Potential grounds include specified commercialization or third-party-use circumstances, qualifying technology programs, and a Patent Prosecution Highway arrangement.
PPH may be available when a participating foreign office has found corresponding claims patentable and the Korean claims sufficiently correspond to those claims. Current Ministry guidance provides for first examination within approximately three months after the preferential-examination decision for PPH and PCT-PPH cases. PPH accelerates review but does not establish patentability or guarantee allowance.
Prosecution schedule
| Event | Timing control |
|---|---|
| Filing and formalities | Confirm filing documents, translation requirements, priority, applicant data, and representative authority. |
| Publication | Generally occurs about 18 months from filing or earliest priority. |
| Examination request | Generally due within three years and may be filed earlier for an earlier place in the examination queue. |
| First examination result | Depends on the technical group and examination route; published averages and targets are not case deadlines. |
| Office action response | The official notice states the deadline; the current designated period is up to four months. |
| Further examination | Allowance, another notice, final rejection, reexamination, or appeal may follow. |
| Registration | The first three annual fees are generally due within three months from receipt of the grant decision. |
Matter-specific forecast
The prosecution forecast should record:
- the examination-request filing date and statutory deadline;
- the current published first-action information for the relevant examination route;
- the expected number of substantive responses based on the prior art and claim set;
- internal instruction and translation time for each response;
- eligibility and document requirements for preferential examination;
- possible reexamination, divisional, and appeal periods; and
- the commercial date affected by prosecution timing.
The forecast should be updated after the examination request and each substantive action. A case may proceed faster when examination is requested promptly and objections are resolved in one response, while multiple examination rounds or an appeal may extend prosecution beyond the original estimate.
Official sources
- Ministry of Intellectual Property: Patent application procedure
- Ministry of Intellectual Property: Annual Report 2024
- Ministry of Intellectual Property: 2026 patent examination plan
- Ministry of Intellectual Property: Preferential-examination timing
Related guidance for Korean patent matters
- Korea PCT National Phase Deadline: The 31-Month Rule
- Korean Patent Office Action Responses
- Working Arrangements Between Global IP Teams and Korean Counsel
Legal and editorial review: July 16, 2026. Korea’s patent authority is the Ministry of Intellectual Property (MOIP), formerly KIPO.
This article provides general information and does not constitute legal advice. Deadlines, fees, and procedures may change, and the current requirements should be confirmed for each matter.
