Yoon & Lee International Patent & Law Firm

Address: Ace Highend Tower-5, 3rd Fl., 226, Gasan digital 1-ro, Geumcheon-gu, Seoul, 08502, Republic of Korea.
Phone: 82-2-6344-1777

Yoon & Lee is one of the leading firms specializing in intellectual property (IP) rights in Korea. The firm was founded in 1989 and offers a comprehensive range of services for IP rights, including patents, utility models, trademarks, designs, and copyright as well as consultation services for the management and enforcement of IP rights. The firm is renowned for both its ability to foster long-term relationships with clients, based on its emphasis on client trust and satisfaction, as well as for its large number of technical experts.

Leading practitioners and technical experts

The managing partner Mr Dong-yol Yoon is a past president of both the Korean Patent Attorneys Association and the Korean Region Group of the Asian Patent Attorneys Association, as well as an ex-president of the Intellectual Property Forum. Mr Seong-ki Kim, a US attorney at law and Korean patent attorney, is a former president of the International Association for the Protection of Intellectual Property (AIPPI) Korea and a former government negotiation member with USTR for chemical patent protection and for WTO TRIPS; while Mr Byeong-ok Song, with an LLM degree from the USA, has practiced patent law in Korea and overseas for over 30 years and is one of Korea’s leading experts in patent prosecution. In particular, we are able to utilize a combination of senior patent attorneys with extensive patent careers, including substantial courts cases before district and high courts as well as the patent court in Korea, with technical specialists with advanced degrees (Ph.D, etc.) in their specialist areas. We also have members that have experience working as examiners at the Korea Intellectual Property Office and as trial examiners at the Korean Patent Tribunal.

Patent and utility model services

Yoon & Lee divides its patent and utility model work into four main teams – telecommunication, standard patent, mechanics, and chemistry and bio-tech – and our technical specialists have advanced degrees in areas including electrical engineering, electronics, communications, computer science, mechanical engineering, chemistry, biotechnology, pharmaceuticals, cosmetics, and life sciences. In addition to our strength and experience in contentious patent issues before both the patent and law courts, we are particularly renowned for our patent prosecution services, where we are able to combine our technical expertise and great experience in the patent area to ensure understanding of our clients’ inventions and achieve success in the patent prosecution process. While we have renowned Korean and international clients in all industrial sectors, we are particularly proud to have represented the largest electronics and cosmetics companies in Korea for many years.

Trademark and design team

The trademark team is a tight-knit group that is able to provide excellent and individualised services to all clients. In particular, it has very strong expertise in Korean trademark practices as the head of the team is a former trademark examiner and trial examiner at the Korea Intellectual Patent Office with more than 30 years of experience in the IP area. The team also includes a US attorney with over 10 years of experience dealing with trademark issues in Korea, as well as having undertaken in-depth studies in relation to copyright, trademarks and designs in the United States. This enables the team to provide a global perspective and to meet the requirements and expectations of its international clients. Litigation activities are supported by the inclusion of a Korean attorney at law in the team, and one of our office’s strengths in litigation cases is the close cooperation that we are able to achieve between our staff for with expertise in trademarks and litigation.

IP Clients

We have a wide range of clients both in terms of geographical distribution and industrial sector; these clients range from major international companies with established global operations to small- and medium-sized enterprises. Unlike in some larger practices, at our firm the most experienced professionals, rather than junior staff, handle all cases – all the partner patent attorneys continue to be involved in case work. The firm is able to work in Korean, English, and Japanese and provides translation services for these languages, as well as for all languages into/from Korean for both domestic and international clients. We place great emphasis on client satisfaction by providing quick, accurate, and specialised services to meet the individual requirements of clients and to build trust over the long term; this is reflected in the over 25-year long relationships that the firm enjoys with major Korean and foreign companies.

Summary of services provided by Yoon & Lee

Our services include the following:

  • Patent and utility model application and registration services (Patent Treaty Applications), prior art searches, registrability searches
  • Trademark and design application and registration services (Madrid Protocol for trademarks/Hague Agreement for design applications), strategy planning, registrability searches, developing brand selection
  • Copyright registrations and unfair competition and anti-counterfeit measures
  • Cancellation and invalidation
  • Infringement litigation
  • Search and watching services
  • Licensing and franchising agreements, assignments for IP rights, technology valuation, technology transfer, contract assistance, cease and desist letters, settlement negotiations
  • Invention mining, providing diverse strategies for planning applications for IP rights, know-how management, maintaining registrations and renewals, and translation services.


Team Members

Mr Dong-yol Yoon

Chief Executive Partner

Mr Byeong-ok Song

Senior Partner

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