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Power of Attorney Requirements for Foreign Patent Applicants in Korea

Pine IP Firm
September 16, 2026

A patent applicant without a residential or business address in Korea must generally appoint a Korean patent administrator to conduct patent procedures before the Ministry of Intellectual Property. The applicant does not need to establish a Korean office.

Signing a power of attorney for a Korean patent application

The power of attorney establishes the representative’s authority. It should be prepared for the applicant, filing route, matter, and intended procedures rather than reused without checking the underlying data.

Required information

The current Ministry examination guidelines state that a power of attorney should identify the matter, the principal and representative, their names and addresses, the granted authority, the execution date, and the principal’s signature or name and seal. The form provided by Korean counsel should be used where possible.

The instruction and power should use the same applicant or owner name and address. A former entity name, an incorrect corporate entity, a missing signer, or a signature by an unexplained affiliate may require correction or evidence of authority.

Specific and general authority

A specific power identifies a particular application or procedure. A general power may be registered for repeated use by the same principal, and the resulting general-power registration number is cited in later filings.

A general power does not remove the need to verify the principal’s identity, corporate changes, or express authority for acts governed by special-authority rules. The intended procedure should be stated to Korean counsel before execution.

Execution and Korean translation

The execution requirements should be confirmed from the current form and the intended procedure. Routine prosecution, a transfer of ownership, a disputed authority issue, and an appeal may require different supporting documents.

The current WIPO PCT Applicant’s Guide for Korea states that a power of attorney in a language other than Korean requires a Korean translation. Korean counsel may provide a bilingual form and prepare the Korean filing text. The Korean text should not be altered independently after counsel issues the form.

Filing time

The power and appointment documents should be completed early enough for review before filing or before a change of representative. A defect may result in an invitation to correct the authority record within a designated period, but failure to correct can invalidate the representative’s appointment and the affected procedure.

For a PCT national-phase application by a nonresident, the WIPO Applicant’s Guide states that an agent must be appointed within two months after expiration of the applicable 31-month national-phase period. This is the outside appointment framework for that procedure and should not be used as the ordinary instruction date.

PCT national phase

The power should identify the PCT application and applicant accurately. If the Korean national-phase applicant differs from the recorded PCT applicant, the instruction should explain the change and include the ownership or corporate documents needed to establish the basis for the change.

A foreign applicant may complete specified national-phase entry steps before appointment of the Korean patent administrator under the PCT provisions, but the appointment must be completed within the applicable period. The filing instruction should allocate responsibility for the national-phase filing, Korean translation, official fee, appointment document, and examination request.

Direct Paris filing

For a direct Paris Convention filing, the power should identify the Korean applicant. If the priority application was filed in another name, the power does not establish the priority entitlement or ownership chain. Those issues require separate supporting records and legal review.

Change of representative

Appointment of new counsel requires the applicable appointment or change filing and evidence of the new authority. Revocation of former authority and appointment of new authority should be coordinated so that responsibility for official communications and active deadlines remains clear.

Each pending application and registered right should be checked individually. A representative change for one matter does not automatically update every right held by the same corporate group.

Actions requiring separate authority review

Withdrawal, abandonment, an appeal, a change of ownership, and other acts affecting substantive rights may require express authority or additional evidence. Counsel should review the intended act against Article 6 of the Patent Act, the enforcement rules, and the current filing form.

Common defects

  • The applicant name or address differs from the filing instruction.
  • A subsidiary signs for a parent without evidence or explanation of authority.
  • The signer’s name, title, signature, or execution date is missing.
  • The matter or granted authority is not identified.
  • The form appoints former counsel or uses an obsolete entity name.
  • A foreign-language power is delivered without sufficient time for Korean translation.
  • A general power registered for one entity is assumed to cover an acquired or affiliated entity.

Execution record

Before filing, the matter record should confirm:

  • the correct legal applicant or owner and current address;
  • the correct Korean representative;
  • the identified application, right, or general-power scope;
  • the authority required for the intended procedure;
  • the signer’s authority and title;
  • complete execution and date;
  • all pages and any required Korean translation; and
  • the deadline for appointment or correction.

Related Korean patent guides

Official references

Last reviewed: July 16, 2026.

This article provides general information and does not replace advice on a specific application, deadline, authority document, or engagement.