How to Register a Patent in Korea: A Step-by-Step Guide for Foreign Companies

Patent registration in Korea runs through the Ministry of Intellectual Property (MOIP) — the ministry that the former Korean Intellectual Property Office (KIPO) was elevated into in 2025: you file an application, request examination, respond to the examiner's findings, and pay the registration fee. For a foreign company, one more piece is fixed from the start — the procedure runs through a Korean patent attorney acting as your local agent. That sounds simple enough on paper, and yet most of the patent questions I get from foreign clients are not about the procedure at all. They are about timing and strategy: whether it is already too late, whether the work done at home can be reused, and whether a Korean patent is worth the money for their particular product.

I am Jaewon Lee, an attorney and patent attorney in Seoul, and I handle patent and trademark matters for foreign companies in English. This guide walks through the questions in the order I actually discuss them with clients.

Should you file before you launch?

Yes — and this is the single point where foreign companies most often lose a patent they could have had. Korea is a first-to-file country: between two parties with the same invention, the earlier application wins, regardless of who invented first (Patent Act, Article 36). Just as important, your own publicity works against you. Once an invention has been made public — a product launch, an exhibition, a paper, a crowdfunding page — it belongs, in principle, to the state of the art, and a later application can fail for lack of novelty over your own disclosure. There is a safety net, but a narrow one: for a disclosure made by the person entitled to the patent, an application filed within 12 months of that disclosure can be treated as if the disclosure had not happened (Article 30) — and the exception must be claimed and proved in the prescribed way, and it does not cover every kind of publication. Relying on it is a rescue operation, not a plan. The practical rule is short: have the patent conversation before the launch press release, not after. If a disclosure has already happened, tell your counsel exactly when and how — the answer depends on those facts.

Can your home application do the work?

Largely, yes. If you have already filed in your home country, you do not start from zero in Korea. Treaty routes let you bring your application into Korea while keeping the benefit of your earlier filing date, and each route runs on its own clock. Under the convention priority route, the Korean application must be filed within one year of your first filing (Article 54). Under the international (PCT) route, an application designating Korea enters the national phase by filing the Korean translation within 2 years and 7 months of the priority date — miss that window and the application is deemed withdrawn in Korea (Article 201). Which route fits depends on where you filed, how many countries you are targeting, and how much time has passed, so the route decision should be made early with your patent counsel. One thing the treaty routes do not change: once the application enters Korea, it runs under Korean law and practice, and the examination proceeds on the Korean text. Translation is not paperwork here — the Korean claims are what you will enforce, so the translation deserves the same attention as the original drafting.

Who handles the procedure in Korea?

A foreign applicant without an address or place of business in Korea conducts the procedures before the ministry through a local agent — in practice, a Korean patent attorney (Article 5). This is not just a formality to budget for. Your Korean agent is the one who argues with the examiner, adjusts the claims, and keeps the deadlines, so the working relationship matters: whether you can discuss claim strategy in your own language, and whether the agent understands what you actually plan to sell in Korea, will shape the patent you end up with. It is the same point I made in the trademark guide — the procedure is local even when the business is global.

What actually happens after you file?

Filing alone does not get you examined. Korea uses a request-for-examination system: an application is examined only upon request, and the request must be filed within three years of the filing date — an application with no timely request is deemed withdrawn (Article 59). Once examination begins, the typical rhythm is familiar to anyone who has prosecuted a patent elsewhere: the examiner raises rejections, you respond with arguments and amendments, and the application either proceeds to a decision to grant or continues the argument through the review stages. After a decision to grant, the registration fee is paid and the patent right comes into existence upon registration (Article 87). From there, the right runs until 20 years from the filing date (Article 88), kept alive by annual fees — a patent is not a one-time purchase but a subscription you should plan to maintain, or deliberately let go, product line by product line.

How do you make it a business decision, not a legal reflex?

Three habits keep the Korean filing honest. First, search before you spend: KIPRIS, the official free database, shows what is already filed in Korea, and an hour of searching has talked more than one client out of an expensive mistake — or into a better claim strategy. Second, match the claims to the Korean market: protect what you will actually sell or license here, not everything the invention could theoretically cover. Third, put the examination timeline inside your market-entry schedule rather than beside it, together with the trademark work — the patent protects the technology and the trademark protects the name, and the two filings should land as one plan, not two surprises.

A note before you rely on this guide

This article describes the standard path in general terms, and the variables it leaves out can change the answer in a real case: whether an earlier disclosure can still be excused, which treaty route and deadline apply to your filing history, who owns an invention made by employees, and whether a utility model or design registration fits your product better than a patent. If any of those touches your situation, have it checked against the current statutes before you commit to a schedule.

If you are preparing to protect an invention in the Korean market, you can reach me in English through lawyerseoul.com — I will help you set the filing route and the timeline before the clock becomes the problem.

Jaewon Lee, Attorney at Law (Joye Law)

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