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Key practice areas
Intellectual property
Trade mark disputes
Trade mark
Patent
Patent prosecution
Trade mark prosecution
IP transactions
Labor and employment
Dispute resolution
International arbitration
White collar crime
Product liability and recall
Insolvency
Tax
Firm overview

Founded in 1977, Lee & Ko is a premier full-service law firm in Korea. With more than 880 professionals organized into 40 specialized teams, Lee & Ko is consistently ranked in the top tier in all of its leading practice areas by international publications. Lee & Ko’s foreign and domestic clients benefit from its incomparable breadth and depth of resources, experience and professionalism.

With more than 100 seasoned patent and trademark attorneys, Lee & Ko’s IP group delivers superior legal services focused on helping clients to navigate the complex legal landscape by providing practical and effective solutions. The IP group is dedicated to the protection, transfer, counselling and enforcement of IP rights. With unrivalled experience in advising and representing clients in cross-border patent/trademark disputes and IP prosecution, the IP group has a global reach and is consistently ranked in top-tier categories for intellectual property by numerous global law firm evaluators, including the Legal 500, Asialaw Profiles (Euromoney), Chambers & Partners, IAM, WTR, and Managing Intellectual Property.

Patent prosecution and patent office trials
The IP group assists clients in multiple industry sectors, including biotechnology, specialty chemicals, semiconductors, materials science, electronics, mechanical, pharmaceuticals, telecoms and computer software. The IP group’s patent attorneys have significant experience litigating before the Korean Intellectual Property Office (KIPO) in invalidity and scope confirmation actions and freedom-to-operate analysis. The breadth and scope of their experience allow the IP group’s patent attorneys to create robust patents by evaluating patent applications during preparation, filing and prosecution with a critical eye towards enforcement. The combined prosecution, transactional and litigation experience enables the IP group’s patent attorneys to ensure that clients develop valuable patent portfolios which offer the broadest protection while ensuring patent validity and enforceability.

Patent litigation, enforcement and dispute resolution
Success in any litigious matter can mean many things. However success is defined, the IP group produces results for its clients. The IP group understands that clients need a trial team with substantial technical and scientific knowledge, but also substantive knowledge of the law and the rules and procedures governing legal proceedings. Many of the IP group’s litigators have strong technology related backgrounds and skills which cover a wide range of technical fields. The IP group also includes litigators who were former judges specializing in IP law and IP cases while serving on the Supreme Court, the Patent Court or the Seoul High Court, as well as former examiners and administrative law judges from the KIPO. When criminal issues arise, the IP group works closely with attorneys in Lee & Ko’s white collar crime group who formerly served as public prosecutors. Complemented by insight received from senior lead litigators, many of whom have 20 to 30 years’ trial experience, and seasoned foreign legal counsels, the IP group is in a unique position to create an effective trial team that can provide comprehensive legal services framed by technical, strategic, judicial, administrative and international perspectives.

Patent development and counselling
The IP group assists clients in developing and deploying a portfolio of strategic IP assets. Beyond the knowledge of IP matters and underlying technology, the IP group is fully aware that a key component to the success of any client includes the strategic use and licensing of its IP portfolio. The IP group has unrivalled experience in negotiating licensing, distribution and joint venture agreements covering all areas of intellectual property. Besides licence negotiation and drafting, the IP group provides counselling for clients on licensing strategies, IP-related competition law issues and strategic product development and distribution.

Trademark prosecution and portfolio management
Lee & Ko offers strategic counselling, trademark prosecution and portfolio management services to clients around the world. Through its network of international law firms, Lee & Ko currently advises numerous multinational and Korean clients across various industries on trademark prosecution matters in more than 50 countries.

IPTAB practice
Lee & Ko has decades of trademark litigation experience before the Korean Intellectual Property Trial and Appeals Board (IPTAB) and has successfully represented multinational clients as part of its worldwide campaigns involving a series of IPTAB actions. Lee & Ko provides positive results but also coordinates legal strategy with other disputes pending around the world.

Comprehensive judicial enforcement of trademark and related rights
Lee & Ko’s trademark team provides comprehensive enforcement solutions by integrating its investigations, enforcement and regulatory teams. Experienced Lee & Ko attorneys in both civil and criminal litigation formulate the best enforcement strategies tailored to each client’s unique circumstances and needs. Lee & Ko’s team works closely with its criminal practice team to instigate criminal proceedings when appropriate and to gather evidence that may be used to later establish civil liability and support any damages claims. This approach is critical because there is no practical means of civil discovery in Korea. Lee & Ko’s attorneys based in Korea, China and Vietnam provide monitoring services on the production and distribution of infringing goods and counterfeits in these countries and other nearby regions. Lee & Ko’s Chinese and Vietnamese lawyers also provide legal expertise in the relevant local laws.

Customs and border management
Lee & Ko’s trademark team is experienced in pursuing customs and border protection measures when appropriate. These may be pursued along with civil and criminal litigation under the Trademark Act and the Unfair Competition Act. Numerous Lee & Ko professionals have extensive experience working with the Korean customs authorities and former high-ranking officials who provide invaluable insight on this issue.
Lee & Ko’s highest priority is to build lasting relationships with clients by being responsive to each client’s specific needs. The firm has a well-earned reputation for successfully handling landmark matters in many of the most important transactions and cases involving business both in Korea and worldwide. Lee & Ko’s fully integrated team of legal experts – with specialties including tax, fair trade law, antitrust and competition matters, criminal enforcement and defense, as well as corporate practice – is well-suited to protect clients’ trademarks, brands and worldwide reputations.

 

Address:
Hanjin Building
63 Nandaemun-ro, Jung-gu
Seoul 04532
Tel:+8227724000 Fax:+8227724001 Email:Contact Us Web Address:https://www.leeko.com/leenko/main.do?lang=EN
2026 Edition
Copyright & related rights
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6 firms ranked
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IP transactions
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7 firms ranked
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Highly Recommended

Bae Kim & Lee
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14 practice areas
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Shin & Kim
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Patent disputes
Tier 1
8 firms ranked
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Tier 1

Bae Kim & Lee
13 practice areas
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Kim & Chang
11 practice areas
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Lee & Ko
14 practice areas
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Tier 2

Shin & Kim
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Yoon & Yang
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Yulchon
14 practice areas
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Tier 3

FirstLaw PC
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Lee International
6 practice areas
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Patent prosecution
Tier 3
15 firms ranked
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Tier 1

FirstLaw PC
3 practice areas
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Kim & Chang
11 practice areas
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YP Lee Mock & Partners
4 practice areas
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Tier 2

Lee International
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NAM IP Group
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Tier 3

Bae Kim & Lee
13 practice areas
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Koreana Patent Firm
6 practice areas
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Lee & Ko
14 practice areas
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Muhann Patent & Law Firm
4 practice areas
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You Me Patent & Law Firm
6 practice areas
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Other Notable Firms

HANOL ClassHankyul IP & Law
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PI IP LAW (Lee Park & Associates)
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SungAm Suh International Patent & Law Firm
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Trade mark disputes
Tier 1
7 firms ranked
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Tier 1

Kim & Chang
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Lee & Ko
14 practice areas
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Yulchon
14 practice areas
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Tier 2

Bae Kim & Lee
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Cho & Partners
7 practice areas
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Yoon & Yang
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Tier 3

Lee International
6 practice areas
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Trade mark prosecution
Tier 2
15 firms ranked
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Tier 1

Kim & Chang
11 practice areas
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Tier 2

Bae Kim & Lee
13 practice areas
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FirstLaw PC
3 practice areas
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Lee & Ko
14 practice areas
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Muhann Patent & Law Firm
4 practice areas
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SungAm Suh International Patent & Law Firm
4 practice areas
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YP Lee Mock & Partners
4 practice areas
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Tier 3

Cho & Partners
7 practice areas
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Lee International
6 practice areas
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NAM IP Group
3 practice areas
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Yoon & Yang
12 practice areas
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You Me Patent & Law Firm
6 practice areas
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Other Notable Firms

E M Hwang & Partners
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PI IP LAW (Lee Park & Associates)
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Yoon & Lee International Patent & Law Firm
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Overview

Law firm Lee & Ko is highly recommended for IP legal services. The firm has a well-regarded litigation team to protect the IP rights of clients. The team consists of experienced IP trial lawyers, patent and trade mark attorneys, technical experts, and former judges. The firm also has a strong prosecution team to support domestic and foreign clients with application filings, portfolio management, and other non-contentious matters. In addition, the firm is capable of handling trade secret and unfair competition matters in multi-jurisdictions.

Notable IP practitioners: Un Ho Kim, Jae Hoon Kim

Testimonials

2026

"Excellent management and coordination of complicated and interconnected disputes in the pharmaceutical area. Able to prepare good drafting and manage timelines effectively."

"Advice is always provided on time and written communications are very clear. The team is large and includes a large number of highly qualified individuals with broad technical backgrounds."

Keum Nang Park

"Excellent client handling and handling of complex pharmaceutical disputes."

"She manages a large team effectively."

 

2025

"Extremely efficient; stick to budget; very knowledgeable. Great communication."

"Lee & Ko is one of the most prestigious law firms in South Korea, and their IP team consistently delivers services that exceed client expectations.”

"Lee & Ko's IP team has a significant interest in doing what is best for the client.  The team communicates well in real-time and helps identify and resolve client's issues in an efficient manner."

"I appreciate Lee & Ko’s IP service for their comprehensive and professional approach. The team is highly knowledgeable and always up-to-date with the latest legal developments, ensuring that their clients receive top-notch advice and solutions."

"I needed a dependable firm with experience in this area and in representing commercial pharmaceutical companies more generally."

"Prompt and efficient. Extremely knowledgeable."

"The Lee & Ko team helps significantly by bringing together US-licensed patent attorneys with strong technical backgrounds to our team. They also help significantly with cultural differences and helping the client understand the nuances and difficulties of United States litigation."

"Their work is always reliable, and their response is quick enough."

"They are knowledgeable, prompt, and responsive."

"Very responsive and professional. Easily able to handle critical tasks."

"We have received great support thanks to Lee & Ko's strategic IP expertise and excellent communication skills."

“What truly sets the Lee & Ko team apart is not just their legal acumen, but also their genuine passion, client oriented mindset, and ability to build trust based relationships. It has been a pleasure to collaborate with them, and I wholeheartedly endorse their work."

Jaewoo Kwak

“Has been instrumental in supporting our licensing transactions and IP management, both of which are mission critical in the biopharmaceutical industry. His strategic insight and practical guidance have been invaluable throughout our engagements.”

Jason Kim

“Has demonstrated exceptional expertise in the biopharmaceutical space. His relentless drive and deep understanding of industry specific IP issues have greatly accelerated the progress of our IP related transactions.”

Linked Reviews
Patent

One notable case study demonstrates the team's successful defence of OCI, a Seoul-based global chemical company, against the infringement claim initiated by Wacker Chemie. 

Trade mark

One case study demonstrates the team's efforts in representing its client, Shinsaegae Property, to obtain an injunction and damages for trademark infringement.

IP transactions

Case studies show the firm has assisted various clients in licensing, assignment, and IP clearance matters.

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