Korea Patent Priority Examination: 2.1-Month Average and Costs

"How long until my Korean patent registers?" is one of the most common questions in Korean patent practice. KIPO's 2025 figures show an average pendency to first office action of 14.7 months under standard examination — but priority examination cuts that to 2.1 months on average. The "super-fast track" for semiconductor, display, secondary battery, biotech, AI, and advanced robotics applications can land within 1 month.

Priority examination is not just about speed. When knockoffs are already in market, or when a foreign PCT national-phase examination needs the Korean home decision, registration timing dictates business outcomes. This guide walks through eligibility, processing time, and cost under Article 61 of the Patent Act and Article 9 of its Enforcement Decree, with practitioner notes on which ground gets you there fastest.

What Priority Examination Does — It Skips the Queue

Korean patent examination normally proceeds in the order of examination requests. Priority examination, under Article 61, allows the examiner to take qualifying applications ahead of others. After filing, KIPO renders a priority decision within about one month, and examination must commence within two months from the decision (three months for PPH cases).

Anyone may file the request — not just the applicant. The window runs from request for examination through to the final decision on patentability. Filing the application, examination request, and priority request together at the start is also possible.

Pendency Numbers — Priority vs. Standard

The numbers from the 2026 examination plan make the difference plain. Standard examination averaged 14.7 months in 2025, priority examination 2.1 months, and the super-fast track in selected high-tech fields lands within 1 month. Compared to 16.1 months for standard examination in 2024, priority examination is about 7x faster.

Eligibility Grounds — Which Ground to Pick

Article 61 of the Patent Act, Article 9 of its Enforcement Decree, and Article 4 of the KIPO Notice on Priority Examination Requests define the eligible grounds. Different grounds require different evidence, so picking the right ground for your situation drives both processing speed and the chance of acceptance.

• Third-party use after publication — a non-applicant is commercially using the published invention (Article 61(1))
• Self-implementation or preparation thereof — proven by production facilities, materials, prototypes, supply contracts
• Direct relation to export promotion — supported by export contracts and overseas market materials
• Defense, green technology, or national R&D project results
• Fourth Industrial Revolution technologies (AI, IoT, etc.)
• Semiconductor, display, secondary battery, biotech, AI, advanced robotics (super-fast track)
• PPH (Patent Prosecution Highway) — uses claims allowed in another office
• Venture, technology-innovative SME, or employee-invention award winners
• Applications with prior art search delegated to a designated agency

Foreign applicants enjoy the same eligibility. However, "implementation" under self-implementation means domestic implementation, so use only abroad does not count. Foreign-only practice should rely on PPH, third-party use, or export-promotion grounds instead.

Filing Fee and Refunds

The priority examination request fee is fixed regardless of claim count: KRW 200,000 for patents and KRW 100,000 for utility models. It is separate from the filing fee and the examination request fee, and must be paid with the priority request.

The startup reduction applies to SMEs within three years of incorporation, capped at 10 applications per year. Co-applicants must all qualify as startups. If the priority request is dismissed or withdrawn, the applicant receives a refund minus the KRW 40,000 administrative cost.

Procedure and Evidence

The procedure is: (1) submit the priority request form (Patent Act Enforcement Rule Form 22), (2) attach the explanation statement, (3) attach evidence specific to the chosen ground, (4) pay the fee. Electronic filing through patent.go.kr is the default.

Evidence varies by ground. Self-implementation in preparation needs production facilities, supply contracts, prototypes, or product catalogs showing imminent practice. Export promotion needs export contracts and buyer documentation. PPH needs the foreign office's allowed claims. Venture-based grounds need the venture certificate or technology-innovative SME designation.

Scenarios — Which Ground Fits Best

Exporters — PPH or Export Promotion

When a Korean filer with co-pending US, Japan, or China applications needs the Korean registration first to accelerate foreign examination, PPH is the most efficient route. Once the foreign office allows claims, request PPH priority examination in Korea — a result within ~3 months is realistic. If PPH isn't available, export contracts and overseas buyer materials can support the export-promotion ground.

Startups — Self-Implementation + 70% Reduction

An SME within three years of incorporation that is commercializing its own invention can claim self-implementation while taking the 70% startup reduction, dropping the official fee to KRW 60,000. Strong implementation evidence — prototypes, websites, contracts — is decisive. The 10/year cap means starting with the highest-priority applications.

High-Tech Fields — Super-Fast Track

Applications in semiconductors, displays, secondary batteries (since Nov 2022), biotech, AI, and advanced robotics (since Feb 19, 2025) qualify for the super-fast track, with results within one month — effectively the fastest path. KIPO publishes the technical scope and filing windows separately, so check the current notice before filing.

Knockoff Disputes — Third-Party Use

When a third party is commercially practicing the invention after publication, file under the third-party-use ground. If the application has not been published, request early publication first, then file priority examination after publication. Strong infringement evidence — product photos, online listings, third-party catalogs — is essential.

FAQ

Q1. Does priority examination guarantee fast registration?

Priority examination jumps the queue, it does not guarantee allowance. If grounds for rejection exist, the examiner issues an office action just as in standard examination, and the applicant must respond under Article 63. One advantage: under priority examination the examiner's review of the response runs 2 months instead of the standard 4, so end-to-end disposal is also faster.

Q2. Can I withdraw the priority request?

Yes — before the examiner issues the priority decision. The applicant gets a refund of the fee minus the KRW 40,000 administrative cost (so KRW 160,000 back for patents). After the priority decision and the start of substantive examination, withdrawal is no longer available.

Q3. Can foreign applicants file?

Yes. KIPO does not discriminate by nationality. Note that "implementation" under self-implementation means domestic implementation, so foreign-only practice cannot support that ground. Foreign applicants typically rely on PPH, third-party use, or export promotion.

Q4. Can I list multiple grounds?

Yes. The examiner grants priority if any one ground qualifies. If the grounds carry different processing deadlines (e.g., 2 months for general priority vs. 3 months for PPH), the examiner confirms the applicant's preference before deciding. The common approach: lead with the easiest-to-prove ground and add supporting grounds.

Q5. Is 2.1 months actually realistic?

It is an average. Outcomes vary with grounds, evidence quality, and technology field. Supplementation requests for the priority statement or evidence add delay. Whether the first office action comes back as an allowance or a rejection still depends on inventiveness and clarity, so specification quality drives the practical benefit of priority.