South Korea Patent and Trademark Translation Requirements: Korean, Certified, Notarized, or Self-Translated?
South Korea patent and trademark translation requirements are not one blanket rule. A patent applicant may use English for a limited part of a direct patent filing and submit a Korean translation later. A trademark application, by contrast, must be written in Korean from the start. In both cases, the key question is usually whether the required Korean text is accurate—not whether a translator has added a certified, notarized, or sworn stamp.
For foreign applicants, there is another practical issue: filing arrangements and official correspondence involve a Korea-based representative. This guide explains the language split, the translation stages, the representative handoff, and the limited situations where an attestation may matter.
Key takeaways
- Patent: English is allowed only for the specification and explanatory text in drawings, when the applicant elects that route. The Korean translation, officially called 국어번역문, is still due by a statutory deadline; missing it can cause the application to be treated as withdrawn. See Patent Act, Article 42-3 and Patent Act Enforcement Rules, Articles 21-2 and 21-3.
- Trademark: the application must be written in Korean. MOIP says an application that is not in Korean is returned without an application number and treated as if it was never submitted. MOIP trademark application procedure.
- Certification: ordinary filing rules specify Korean text and filing documents; they do not list a certified, notarized, or sworn translator’s credential as a standard attachment.
- Nonresident applicants: arrange a Korea-based representative early and plan for official correspondence to be delivered to a Korean address. MOIP’s regular phone support is Korean-language; it lists an English inquiry email. MOIP application FAQ.
Who this guide is for
This guide is for foreign individuals and businesses preparing a national patent or trademark filing in South Korea. It is especially relevant to overseas inventors, founders, brand owners, corporate IP managers, and in-house counsel coordinating with a Korean representative. English-to-Korean is a practical example language pair, not a published ranking of filing languages.
Typical files include an English patent specification, claims, abstract, and drawing labels; or Korean trademark application details, a mark representation, and Korean goods and services descriptions. A foreign priority document or power of attorney may also be in the file set. A common sticking point is being told that a translation must be certified or notarized without being told which document, route, or rule requires it.
South Korea patent and trademark translation requirements: two different language paths
Patent applications: a limited English route, followed by Korean
South Korea permits an applicant to designate English for the patent specification and drawings’ explanatory text. The applicant must indicate that choice in the application. This is a narrow exception; it is not permission to submit an entire patent filing package in any language. The Patent Act defines the permitted materials, while the Enforcement Rules specify English as the language for this route.
The Korean translation, called 국어번역문 in the statute, is due within one year and two months of the applicable date under Patent Act Article 64(1). If the applicant receives notice that an examination request has been made before that deadline, the translation deadline becomes the earlier of three months from the notice or the original one-year-and-two-month date. If the required translation is not filed, the application is deemed withdrawn the following day. Check the specific date calculation with the Korean representative; do not calculate it from the day a translator receives the file. Article 42-3 also describes when a mistranslation correction may be made, so a later correction should not be treated as a substitute for a careful initial translation.
The Rules describe the translation submission and list the Korean text and, when an agent is acting, proof of authority. They do not list a translator’s certification, notarial certificate, or sworn status as a standard attachment. A commercial product labelled “certified translation” should not be confused with a MOIP filing requirement.
Trademark applications: Korean at the outset
A Korean trademark application must be written in Korean. MOIP’s procedure page says an application in another language is returned without an application number and treated as never submitted. That can mean there is no Korean filing date to rely on. There is no matching English-first buffer like the limited patent route.
The application record includes the applicant’s name and address, the mark, and the designated goods and class. Goods and services descriptions need to be entered in Korean. A mark may itself use Latin letters or another visual form; do not automatically transliterate or translate the brand name without deciding with the representative how the mark should be represented. If claiming foreign priority, MOIP says the priority document is due within three months of the Korean filing date, a separate deadline from any translation question. MOIP’s trademark procedure page covers the language rule, formal return, and supporting-document timing.
Does Korea require a certified, notarized, or sworn translation?
For ordinary initial patent and trademark filings, the rules reviewed require the relevant Korean text but do not set a general sworn-translator system or require a notary’s stamp on the patent specification translation. They also do not list a translator’s license as a standard attachment for the Korean translation submission. This does not mean that MOIP has pre-approved a particular translation or guarantees that self-translated text will be accurate.
| Document or stage | What the language rule means | What to confirm |
|---|---|---|
| Direct patent filing using English | English may be used for the permitted specification and drawing text; Korean translation follows by the statutory deadline. | Have the Korean representative confirm the filing date calculation, scope of English material, terminology, and review responsibility. |
| Trademark application | The application must be in Korean from the outset; an application in another language may be returned without an application number. | Confirm the Korean goods and services wording and how the mark itself should be represented. |
| Priority document | A “certified copy” refers to the official copy from the originating IP office. It does not, by itself, mean a certified translation is required. | Ask whether a Korean translation is required for your document and route. MOIP’s patent procedure distinguishes the priority copy from a Korean translation requested in a particular case. |
| Foreign-language registration certificate after grant | This is a different, post-registration service—not the initial application translation. | For this specific certificate request, MOIP describes a notarized translation or a translation confirmation certificate from a foreign-language translation administrative agent. Its instructions include a limited exception when certain English details are carried over unchanged. MOIP’s foreign-language certificate instructions set out the requirements. |
The post-grant certificate rule helps explain why applicants sometimes see Korean references to 번역공증 or 번역확인증명서. Those terms should not be copied into an initial-filing checklist unless the receiving procedure actually calls for them.
Can you translate the filing yourself?
The ordinary filing provisions specify the Korean text to submit, but do not identify a required professional credential for the translator or state that the applicant must use a sworn translator. They also do not make self-translation a safe harbor. The applicant remains responsible for the text, and patent translation has a particular practical risk: the Korean specification and claims become part of the record used to define the application’s technical scope.
A mistranslated claim term, inconsistent component name, omitted qualifier, or changed relationship between steps can create examination and correction problems. The statute provides a correction route for certain mistranslations during defined periods, but that is not a promise that every error can be repaired without consequence. For a trademark, the risk is different: an unreviewed Korean rendering can alter how the mark or product description is understood. Have the Korean representative review the wording before filing or before the translation deadline.
Machine translation can help with internal review or search, but do not treat a machine output as a submission-ready patent claim set. MOIP points users to KIPRIS for Korean-English machine translation of patent materials; it is a research aid, not an official certification of a translation.
How the filing and translation handoff works
- Identify the route. Confirm whether you are making a direct national filing (the linked Incheon guide is a city-specific example of this national route), entering the Korean national phase through PCT, or designating Korea through another international route. The English-first patent rule described above is not a substitute for route-specific instructions. For the filing order and deadline details, use the existing South Korea patent and trademark translation deadlines guide.
- Confirm the local representative. MOIP states that a patent applicant without a residential or business address in Korea must appoint a Korean patent attorney; its trademark procedure also requires a Korea-based agent for an applicant without a local address. MOIP’s FAQ says overseas applicants cannot use the online filing system in the same way as Korea-based users. The exact representative role can differ by procedure, so confirm it with MOIP or the chosen representative. A translation company is not a substitute for that appointment. See the existing guide to verifying a Korean patent representative.
- Agree on the document list. Send the representative the source specification and claims, drawing labels, applicant and inventor spellings, priority details, and any power of attorney or supporting records. Ask which items require Korean text, which may follow later, and whether a source document needs authentication. Do not infer a notarized translation requirement from the word “certified” on a priority-document checklist.
- Set the translation and review schedule. For an English patent filing, work backward from the legal deadline and reserve time for technical review by the Korean representative. For a trademark, prepare Korean application text before submission; there is no later translation window for an English application.
- File and monitor Korean correspondence. MOIP says patent notices are sent by registered mail to the Korean address on record or the representative’s Korean address, rather than by email. Its regular hotline is Korean-language, while English questions can be sent to [email protected]. Make sure the representative has current contact details and a process for forwarding notices promptly.
Wait time, cost, and mailing reality in South Korea
MOIP’s trademark procedure page, last updated April 2, 2026, says trademark examination generally takes about five months from filing. Treat that as an agency estimate for examination, not a promise of registration, a translation turnaround, or a fixed total processing time. Patent examination follows a different route and requires an examination request; the translation deadline is a separate statutory clock.
Translation and agent charges are private service costs, separate from MOIP filing fees. Ask for an itemized quote that identifies whether it covers claims, drawing text, terminology review, layout, a second review, revisions, confidentiality, and delivery timing. Have the agent quote filing and legal review separately from translation work.
The distinctive logistics issue for an overseas applicant is not an in-person visit to a city office. It is the Korean-language and Korean-address handoff: official patent correspondence is sent by registered mail to the local address on file, and online filing access is limited for users without a Korea-based residence or business address. MOIP’s FAQ describes the representative and correspondence arrangements. Do not rely on a translator to monitor government mail.
What public evidence says about applicant experience
The clearest documented friction is administrative: a foreign applicant may need a Korean representative, notices go to a Korean address, and the routine phone line is Korean-language. These points come from MOIP’s own guidance, not from an online anecdote. Korean-based IP translation firms also publish review workflows, but those are supplier descriptions—not independent evidence that MOIP requires a particular certification or that a customer’s claims were accepted.
Published personal accounts do not establish how MOIP will treat a self-translated claim set. Stories about immigration, marriage registration, or school documents involve different receiving authorities. For a real case, ask the Korean representative to confirm in writing who approves the Korean text and who tracks each deadline.
Commercial translation services: what their public pages show
South Korea has specialist IP translation firms, but the examples below are commercial providers, not government-approved translators or endorsements. Their published claims are useful for comparing service scope; verify current language direction, confidentiality terms, and technical review directly.
| Provider | Published service information | Boundary to check |
|---|---|---|
| KENS Translation | Identifies itself as a patent, legal, and technical translation firm; lists Korean, English, Chinese, and Japanese. Its site says reviewers compare translations against the source line by line. It lists Yangcheon-gu, Seoul, and [email protected]. | These are the company’s own service claims. Ask whether the assigned translator has experience in your technical field and whether your Korean patent representative will review the final claims. |
| KIPT | Publishes IP translation services and describes a three-tier review process. Its listed Seoul contact is Room 521, 202 Baekbeom-ro, Mapo-gu, Seoul; [email protected]. | Confirm the requested language direction and whether the quote includes claim-level review, revision rounds, and a confidentiality arrangement appropriate for unpublished material. |
These are examples, not a ranking. MOIP’s filing instructions do not direct applicants to a government-approved translation-company list. Ask any provider claiming an official approval or certification stamp to identify the exact current rule and filing stage before paying for it.
Public support and complaint routes
| Resource | Useful for | What it does not do |
|---|---|---|
| Ministry of Intellectual Property (MOIP) | Official application FAQs, representative requirements, correspondence practices, and an English inquiry email. | It is the government authority, not a private translation or legal-advice provider. |
| Korea Patent Attorneys Association (KPAA) | Search its patent attorney information directory. MOIP’s FAQ also lists +82 2 3486 3486 and [email protected]. | KPAA is not a translation certification body and does not replace reviewing a representative’s scope and fee terms. |
| MOIP report for patent-agent misconduct | Use this route for suspected unlicensed patent representation or the listed professional-conduct violations. | It is not a general complaint channel for translation quality or a private invoice. |
| Korea Consumer Agency’s 1372 Consumer Counseling Center | An individual consumer with a dispute about a paid translation service can ask whether the consumer counseling process applies. | It is not an IP regulator or a specialized route for business-to-business patent disputes. |
For a translation-service dispute, keep the quote, contract, source files, delivery record, and revision requests. Use the MOIP reporting route only when the concern is unauthorized or improper patent-agent work; for a commercial service complaint, first confirm that the consumer route applies to your transaction.
Local data and what it can tell you
The practical national timing signal is MOIP’s estimate of about five months from trademark filing to examination. It helps set expectations for that examination stage, but says nothing about translation time or the chance of registration. MOIP’s procedure guidance does not publish a breakdown of filings by translation language pair or a self-translation acceptance rate. English is highlighted here because the statutory foreign-language patent filing exception currently applies only to English; it should not be read as a measured ranking of applicant language needs.
Frequently asked questions
Can I file a South Korean patent application in English and submit Korean later?
For the limited route under Patent Act Article 42-3, you may use English for the specification and explanatory text in drawings if you designate that choice in the application. The Korean translation is still due by the statutory deadline, which can become earlier if an examination-request notice arrives. The rule does not make the whole application packet an English filing.
Does a South Korean trademark application have to be written in Korean?
Yes. MOIP says an application not written in Korean is returned without an application number and treated as if it was never submitted. Prepare the Korean application text and goods and services descriptions before filing.
Does South Korea require certified translation for patent filing?
The ordinary filing rules reviewed specify a Korean translation but do not list a certified-translator credential or certificate of accuracy as a standard filing attachment. Ask the Korean representative about the exact document and route before ordering a special certification.
Does the Korean translation need notarization or a sworn translator?
The initial filing provisions do not establish a general notarized or sworn-translation requirement for the patent specification or trademark application. A different post-grant request—an optional foreign-language registration certificate—has a specific proof-of-translation rule described by MOIP.
Can I self-translate a patent application for Korea?
The cited filing provisions do not prescribe a translator qualification. They also do not certify the quality of an applicant’s self-translation. Because claim wording can affect the patent record, have a Korean patent professional review technical terminology and the final Korean text.
Is a certified priority copy the same as a certified translation?
No. A certified priority copy is issued or authenticated by the office that holds the earlier application. It is not, by itself, proof that a separate Korean translation must be notarized or certified. Ask whether a Korean translation is required for your specific priority document.
How long does Korean trademark examination take?
MOIP’s procedure page gives a general estimate of about five months from filing to examination. That is an estimate for an examination stage, not a guaranteed time to registration or a translation-service turnaround.
Prepare the Korean text for review
If your Korean representative has identified documents for translation, CertOf can help with language conversion, formatting, and a translation accuracy certificate. Use the service for document preparation, then send the text to your Korean representative for legal and technical review. CertOf does not act as a Korean patent agent, submit an application to MOIP, certify a translation on MOIP’s behalf, or guarantee acceptance.
Start a translation order, learn about CertOf’s translation service, or contact the team about a document-specific request. Before uploading an unpublished invention, review the privacy terms and confirm that third-party processing is permitted by your organization and Korean counsel.
Disclaimer: This guide is general information, not legal advice or a substitute for instructions from MOIP or a Korean patent representative. Filing rules, forms, and deadlines can change; confirm the current requirements for your route and documents before submitting.