Korean Patent Prosecution Timeline and Examination Options
Korean patent prosecution has no fixed filing-to-grant period. The schedule depends on the date of the examination request, the examination track, the technical field, the number of office actions, and the time used for each applicant response.
A useful forecast separates the period before examination is requested, the wait for the first examination result, and the response and review periods after examination begins.
Filing and publication
After filing, the Ministry of Intellectual Property reviews formal requirements. A direct foreign-language filing requires a Korean translation within the applicable period. A PCT application entering the Korean national phase must satisfy the Korean entry requirements by the 31-month deadline, subject to the limited translation-extension procedure.
A patent application is generally published 18 months after the filing date or earliest priority date. Early publication may be requested. Publication makes the technical disclosure available to the public but does not begin substantive examination.
Examination request and first action
Examination must generally be requested within three years from the application date. For a PCT national-phase application, the period is calculated from the international filing date. An application for which examination is not requested by the deadline is deemed withdrawn.
The first-action period runs from the examination request to the first substantive examination result. The Ministry’s February 2026 examination plan set a target of reducing the average waiting period to 14 months by the end of 2026. This is a portfolio-level target and not a deadline for an individual application.
Office action response and grant
If the examiner issues a notice of grounds for rejection, the designated response period is currently up to four months. The notice controls the exact deadline, and extensions may be available under the applicable rules. The examiner may allow the application after reviewing the argument and amendment or may issue another action or a final rejection.
Following a decision to grant, the applicant must generally pay the annual fees for the first three years within three months from receipt of the decision. Registration follows payment and completion of the required formalities.
Examination tracks
| Track | Published timing information | Scope |
|---|---|---|
| Regular examination | The Ministry’s 2026 plan targets an average first-action waiting period of 14 months by year-end. | Actual timing depends on the case and technical field. |
| PPH and other preferential examination | PPH examination is generally scheduled within three months after the preferential-examination decision. | Eligibility and supporting documents are required. |
| Super-accelerated startup program | The Ministry reported an average waiting period of 0.9 months for qualified participants in June 2026. | The program is limited to qualifying startups and designated advanced-technology fields. |
The Ministry introduced the super-accelerated program for qualifying export-oriented advanced-technology startups in October 2025 and expanded coverage to qualifying artificial-intelligence and biotechnology startups in February 2026. Its reported results do not apply to ordinary applications or establish a guaranteed grant date.
A favorable result from another patent office may support a PPH or PCT-PPH request, but a PCT filing does not by itself accelerate Korean examination. A Korean examination request and compliance with the selected preferential-examination route remain necessary.
Applicant-controlled timing
An applicant can reduce avoidable delay by:
- requesting examination at filing or national-phase entry when early examination is commercially necessary;
- reviewing the claims for Korean support, clarity, and amendment options before examination;
- using PPH, PCT-PPH, working-of-invention, or another preferential route when the requirements are met;
- preparing an accurate Korean translation and a consistent terminology record;
- providing instructions before the response deadline;
- using an examiner interview when a focused technical or claim issue can be clarified; and
- preparing signatures, declarations, and internal approvals in advance.
Immediate examination is not appropriate for every application. A later request may defer cost and allow related foreign prosecution to develop. The filing strategy should reflect product launch, enforcement, licensing, and budget requirements.
Common causes of delay
Common causes include a late examination request, unresolved applicant or ownership data, translation corrections, disorganized claim sets, repeated inventive-step rejections, and delayed instructions. A divisional application has a separate examination record and should be forecast independently.
Applicant-caused delay may also affect patent-term adjustment. Prosecution speed and any available term compensation should therefore be reviewed together.
Forecasting method
A matter forecast should state at least three scenarios:
- an accelerated scenario based on immediate examination, confirmed eligibility for preferential treatment, and one response;
- an expected scenario based on regular examination and one or more office actions; and
- a longer scenario that includes reexamination, a divisional filing, or an appeal to the Intellectual Property Trial and Appeal Board.
Each forecast should be updated after the examination request, first office action, and any final rejection. Product and investment decisions should not rely on a single projected grant date.
Official sources
- Ministry of Intellectual Property: June 2026 super-accelerated examination update
- Ministry of Intellectual Property: 2026 patent examination plan
- Ministry of Intellectual Property: Patent Prosecution Highway
- WIPO PCT Applicant’s Guide: Republic of Korea
Related Korean patent guides
- Request for Examination in Korea: Deadline, Fees and Strategy
- Accelerated Patent Examination in Korea: Eligibility and Procedure
- Patent Appeals and Reexamination in South Korea
Legal and editorial review: July 16, 2026. MOIP is Korea’s current IP authority; some official English pages may retain KIPO or transitional terminology.
This article provides general information and does not constitute legal advice. Korean law and Ministry practice may change, and the correct action depends on the facts and relevant dates.
