Patent Enforcement in Korea: Pre-Filing Assessment and Remedies

Patent enforcement in Korea should begin with a documented commercial objective and a review of the asserted patent. The owner should confirm title, status, claim scope, validity risk, available evidence, and the expected response of the accused party before issuing a warning or filing a proceeding.

Available measures include a civil infringement action, preliminary relief, an invalidation trial before the Intellectual Property Trial and Appeal Board, customs measures, and criminal proceedings in qualifying cases. The selection depends on urgency, proof, validity, cost, and the parties’ commercial relationship.

Enforcement objective

The written enforcement plan should identify and rank the intended results. These may include:

• preventing a Korean product launch, manufacture, sale, or importation;
• preserving market exclusivity;
• recovering damages;
• negotiating a licence or cross-licence;
• coordinating a Korean action with a dispute in another jurisdiction;
• deterring similar conduct by other market participants; or
• resolving claim-scope uncertainty without public litigation.

The procedure, evidence, and settlement authority should correspond to the identified objective.

Title, status, and authority to sue

Before contacting the accused party, the owner should verify:

• the registered owner and complete chain of title;
• patent status, annual-fee payments, and remaining term;
• exclusive licences, security interests, and any issue affecting standing;
• the Korean claims and complete prosecution history;
• relevant prior art and identified validity issues;
• the accused products or processes and the acts occurring in Korea;
• available product samples, manuals, test results, sales information, and technical records; and
• related proceedings, licences, and positions outside Korea.

The infringement analysis must use the Korean patent claims. A claim chart prepared for a related United States, European, or Japanese patent does not establish infringement of the Korean patent.

Infringement and validity analysis

Each asserted claim should be analyzed for literal infringement and, where relevant, infringement under the doctrine of equivalents. The record should identify direct evidence, required inferences, missing facts, claim-construction issues, and expected non-infringement positions.

The same claims should be reviewed for novelty, inventive step, written-description and enablement support, priority, and the effect of amendments or prosecution statements. A broader proposed construction may strengthen the infringement allegation while increasing validity risk.

An accused infringer may file an invalidation trial before the Intellectual Property Trial and Appeal Board. The owner should prepare its validity position before enforcement begins.

Evidence collection

Evidence should be collected before notice if the product may change or relevant material may become unavailable. Product purchases should use traceable channels. Packaging, webpages, software versions, dates, and custody of physical samples should be documented. Technical testing and online collection must comply with Korean law.

Korean civil procedure does not provide United States-style discovery. The complaint and evidence plan should identify the technical records, sales information, expert work, and available court procedures required to prove infringement and damages.

Initial communication

A business communication or warning letter may support licensing discussions or cessation without litigation. It should identify the asserted right and relevant conduct accurately. Unsupported allegations, unnecessary admissions, and disclosure of material beyond the communication’s purpose should be avoided.

Before sending notice, the owner should consider whether the accused party is likely to alter evidence, communicate with customers, commence an invalidity proceeding, or seek other procedural relief.

Preliminary injunction

A preliminary injunction may be considered when delay would cause serious harm that is difficult to remedy later. The court reviews the asserted right, infringement showing, urgency, balance of harm, and other circumstances. The accelerated record requires the owner to prepare the patent, technical evidence, and validity response before filing.

Main infringement action

A civil infringement action may seek an injunction and damages. Patent infringement cases are assigned to designated first-instance courts. The Intellectual Property High Court of Korea has exclusive appellate jurisdiction over civil actions relating to patent and other specified IP rights.

A damages analysis may consider the owner’s lost sales and production capacity, the infringer’s profits, a reasonable royalty, the contribution of the patented feature, and the infringer’s conduct, subject to the current Patent Act and case law. The calculation should use case-specific evidence rather than a generalized multiplier.

Customs and criminal measures

Korea Customs Service permits patent rights to be registered for protection during import and export clearance under Article 235 of the Customs Act. Customs registration and supporting technical information should be prepared before the relevant shipment where border action is contemplated.

Criminal proceedings may be available for qualifying patent infringement. The evidentiary standard, available remedies, and commercial consequences differ from a civil action and require a separate assessment with Korean counsel.

Time, cost, and settlement authority

The enforcement budget and approval record should address:

• the estimated time to an interim and final result;
• legal, technical, translation, and expert costs by procedural stage;
• the estimated prospects of an injunction and damages recovery;
• invalidity, non-infringement, and counterclaim risk;
• effects on customers, suppliers, regulators, and commercial partners;
• acceptable settlement and licensing terms; and
• coordination with proceedings outside Korea.

Settlement authority should cover confidentiality, release scope, future products, audits, payment security, foreign affiliates, and related proceedings before litigation begins.

Consistency across proceedings

The civil court and the Intellectual Property Trial and Appeal Board decide different issues, but positions taken in one proceeding may affect the other. Claim construction, technical explanations, translations, and validity positions should be reviewed for consistency across the Korean civil action, invalidation proceeding, foreign cases, and licensing communications.

Official sources

• Intellectual Property High Court of Korea: Jurisdiction
• Korea Customs Service: Intellectual Property Rights Protection
• Ministry of Intellectual Property: Intellectual Property Trial and Appeal Board

Related Korean IP guidance

• Freedom-to-Operate Analysis in South Korea
• Korean IP Due Diligence for M&A Transactions
• Korean Patent Prosecution Quality Assessment

Legal and editorial review: July 16, 2026. Korea’s current patent authority is the Ministry of Intellectual Property (MOIP), formerly KIPO.

This article provides general information and does not constitute legal advice. Korean law and Ministry practice may change, and the appropriate approach depends on the facts of each matter.