Firm Profile > Yoon & Lee > Seoul, South Korea

Yoon & Lee
SEOUL 08502
South Korea

Intellectual property: local firms Tier 3

Boutique firm Yoon & Lee 'provides professional and efficient assistance', particularly in the areas of patent and trade mark management and enforcement. The practice consists of multiple focused teams; Yong-Won Lee heads up the standard patent group; Sang-Yong Lee leads on trade mark and design matters; Ji-Man Park handles work from clients in the telecommunications sector; Byeong-Ok Song focuses on the mechanics industry and managing partner Dong-Yol Yoon takes charge of chemistry and biotechnology-related work. The team comprises of both senior patent attorneys and technical specialists from diverse areas, including electrical and mechanical engineering, computer science, chemistry, biotechnology, pharmaceuticals, cosmetics and life sciences.


Yoon & Lee’s team provides professional and efficient assistance with patent matters.

Ji-Man Park and Yong-Won Lee both have more than 10 years’ experience and extensive technical knowledge.

Key clients

Samsung Electronics

Sony Interactive Entertainment Inc.

Amore Pacific

Naraenano-Tech Co. Ltd.

Naeilhae Co. Ltd.

Wavelink Co. Ltd.

KMDP Co. Ltd.

Bandyco Co. Ltd.

Chrio Korea Co. Ltd.

Handu Korea Co., Ltd.

Trust & Communication Co., Ltd.

Homyung Eng. Co. Ltd.

Hon-ik Group

The firm: Yoon & Lee was founded in 1989 by Mr Dong-yol Yoon, one of the leading figures in the Korean IP sector and a former head of the Korean Patent Attorneys Association. After initial strong growth, the firm is continuing to expand in 2020 despite the challenging business environment bolstered by its strong reputation for patent filing, prosecution, and registration both in Korea and overseas, especially in the electronics, software, mechanical, pharmaceuticals, cosmetics, and biochemical sectors. In recent years, the trademark and design sector has been expanding under the leadership of Mr Sang-yong Lee, a former trademark examiner at the Korea Intellectual Property Office (KIPO).

Yoon & Lee has a wide range of clients in terms of geographical distribution and industrial sector and also ranging from established global operations to small and medium sized enterprises. The firm’s philosophy is to create strong trust-based relationships as reflected in the near 30-year long relationships developed with some of Korea’s most famous companies. We believe that honesty and a reputation for excellent work leads to satisfaction for clients and a good reputation for the firm.

In particular, we are well-known for the high percentage of patent attorneys and technical specialists in comparison with general law firms and other patent law firms in Korea, which allows us to offer an efficient and effective combination of patent attorneys, former KIPO examiners, foreign attorneys, and technical advisors with advanced degrees.

Areas of practice: Yoon & Lee’s services cover all aspects of intellectual property rights (IP) with a specialization in the prosecution of patents, utility models, trademark, and design applications, but also including litigation, copyright protection, licensing agreements and assignments, and technology valuation and transfer services.

For patents, the firm provides effective and efficient services for domestic and international patent rights, especially in high technology fields such as electrical engineering, electronics, telecommunications, machinery, chemistry, biotechnology, pharmaceuticals, and life sciences. The electronic and software and telecommunications sectors are overseen by Mr Ji-man Park and Mr Yong-won Lee. Mr Park has an excellent reputation for his technical and legal knowledge and has advised major companies and the courts on technical issues and IP rights, while Mr Lee has over 14 years’ experience as a patent attorney and is proficient in 3GPP LTE & LTE-A and 5G communication standards. Mr Byeong-ok Song is in charge of the mechanical and mechatronics, optics, semiconductors, and electrical and electronics sectors as well as promotion of inbound cases. He has an MS in physics, an LLM from Washington University (USA), and over 30 years’ experience as a patent attorney. Mr Dong-yol Yoon, as well as being managing partner, also heads the chemical and biochemical sectors..

The trademark and design team headed by Mr Lee also includes a licensed US attorney (Ms Jaewon Yoon) with a background in IP to provide a global perspective. The team acts for businesses in all market sectors from established global organizations to small and medium sized enterprises and a globally expanding franchise operation. It is building a growing overseas reputation and handles trademark filings and registrations from clients in the USA, China, Japan, the EU, South America, and Southeast Asia as well as local Korean clients.

Department Name Email Telephone
Patent and utility model registration and prosecution Dong-yol Yoon
Patent and utility model registration and prosecution Byeong-ok Song
Patent and utility model invalidation, infringement, and litigation Dong-yol Yoon
Patent and utility model invalidation, infringement, and litigation Ji-man Park
Patent/utility model - Electronics & Software Ji-man Park
Patent/utility model - Electronics & Software Yong-won Lee
Patent/utility model - Chemical & Biochemical Dong-yol Yoon
Patent/utility model - Mechanical & Mechatronics Ji-man Park
Patent/utility model - Mechanical & Mechatronics Byeong-ok Song
Trademark filing and prosecution Sang-yong Lee
Trademark filing and prosecution Jaewon Yoon
Trademark infringement and litigation Sang-yong Lee
Trademark infringement and litigation Jaewon Yoon
Copyright protection Sang-yong Lee
Copyright protection Jaewon Yoon
Design filing and prosecution Sang-yong Lee
Design filing and prosecution Jaewon Yoon
Unfair competition and anti-counterfeit measures Dong-yol Yoon
Unfair competition and anti-counterfeit measures Ji-man Park
Licensing agreements and assignments Dong-yol Yoon
Licensing agreements and assignments Ji-man Park
Technology transfer and valuation Byeong-ok Song
Technology transfer and valuation Ji-man Park
Consultation on establishment and protection of IP rights Dong-yol Yoon
Consultation on establishment and protection of IP rights Byeong-ok Song
Photo Name Position Profile
Mr Sang-yong Lee  photo Mr Sang-yong Lee Partner Patent Attorney
Mr Yong-won Lee  photo Mr Yong-won Lee Partner Patent Attorny
Mr Ji-man Park  photo Mr Ji-man Park Partner Patent Attorney
Mr Byeong-ok Song  photo Mr Byeong-ok Song Partner Patent Attorny
Mr Dong-yol Yoon  photo Mr Dong-yol Yoon Managing Partner
Ms Jaewon Yoon  photo Ms Jaewon Yoon Associate
World Intellectual Property Association of Korean Practitioners
Asian Patent Attorney Association (APAA)
Fédération Internationale des Conseils en Propriété Intellectuelle (FICPI)
LES (Licensing Executives Society)
INTA - International Trademark Association

CLIENT: Sunhee LEE, Partner
TESTIMONIAL: “We were impressed by YOON & LEE’s commitment to providing the best solutions and taking time to discuss with us both the technical and legal issues.”

CLIENT: Yoshitaka TANINO, Vice President/Intellectual Property Dept.
COMPANY/FIRM: Murata Manufacturing Co., Ltd.
TESTIMONIAL: “Mr. Byeong-ok Song, leading the incoming team of this firm, was very approachable and demonstrated in-depth knowledge of the technical issues of our inventions. Mr. Song’s thoroughness and attention to detail in ensuring we received adequate patent protection has been most impressive.”

CLIENT: Gi-Beum HONG, Marketing/Team manager
COMPANY/FIRM: LitePharmTech Co., Ltd.
TESTIMONIAL: “The Trademark/Design team showed a deep understanding of trademark issues and were very cooperative in enabling us to register trademarks smoothly and efficiently”

CLIENT: Sam KO, Manager/Overseas Department
COMPANY/FIRM: Credere Co., Ltd.
TESTIMONIAL: “Mr. Sang-yong Lee has an excellent understanding of trademark issues and was very cooperative in enabling us to register trademarks efficiently and without any problems arising.”


Yoon & Lee is a specialist IP law firm with over 30 years of experiencing in providing the highest quality services to leading domestic and foreign companies. The firm provides a comprehensive range of IP services from prosecution and litigation for patents and trademarks to consultation services for management and enforcement of IP rights.

In particular, the firm is renowned for its technical expertise with a high percentage of patent attorneys and technical experts (over 50 out of a total staff of 88) compared with general law firms and other patent law firms in Korea. This enables us to offer an efficient combination of patent attorneys, domestic and foreign attorneys, a former KIPO examiner, and technical experts with advanced degrees in their specialist subjects such as electrical engineering, electronics, communications, computer science, mechanical engineering, chemistry, biotechnology, pharmaceuticals, cosmetics, and life sciences. Our specialists are often called to testify as expert witnesses in court cases.

In addition to our skills and experience, our main corporate values are sincerity, reliability, and harmony, which are reflected in our work practices. First, all staff members strive to increase their professionalism and work skills so that they are able to meet the ever changing technological advances as well as developments in the laws, policies, and legal cases in various jurisdictions. Second, we provide quick, accurate, and specialized services to satisfy our clients’ requests while solidifying trust and establishing long-term client relationships. Third, all our staff cooperate and work together actively to provide comprehensive services that benefit from their combined experience and skills.

Based on such values along with the technical knowledge and long IP experience of our partners, we are able to offer optimized services to satisfy a wide range of clients. Our emphasis on client satisfaction is reflected in the long-term relationships that we have developed with major domestic and foreign companies. Also this has enabled us to reach a wide range of clients ranging from global corporations to small and medium sized enterprises. All our clients, no matter their size or history, receive the same high quality service. In particular, all cases receive the highest level of attention from our senior practitioners rather than cases being delegated to junior level staff, with all the partners continuing to be active in case work.

Please do not hesitate to contact us and find out how we can assist you and ensure smooth progress for any IP issues in Korea. We are sure that you will not be disappointed by our commitment to ensuring your satisfaction.