Yoon & Yang LLC

Intellectual Property Department

South Korea
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Yoon & Yang’s Intellectual Property (IP) Practice Group consists of IP attorneys and patent attorneys, including the former Chief Justice of the Patent Court, who have abundant experience in representing numerous Korean and multinational companies in IP litigation cases.  Our services range from securing, protecting and defending IP rights to providing the full spectrum of advisory services for transactions involving IP rights in a wide range of technologies.  The Group has expertise in all phases of IP litigation and in particular, it has accumulated considerable know-how and expertise in patent litigation and demonstrates the best litigation performance in Korea.

Yoon & Yang’s separate Patent Prosecution Group was established as Law Office of Kim, Shin & Yu’s IP Department in 1967 and was renamed under its current name in 2014.  It is recognized as one of the best quality service providers in Korea, which is equipped with diverse litigation experience and stellar patent technology assessment capabilities.

Yoon & Yang was recently ranked as Tier 1 in “Patent Contentious” in the 2020 Asia IP Survey announced by Asia IP. Further, the IP Group has been ranked as Tier 1 in “Patents” and “Copyright/Trademarks category in ALB IP Rankings for three consecutive years from 2018 – 2020, and the Firm was named “Korea Law Firm of the Year” in IP practice area by Asian-Mena Counsel’s In-House Community Survey in 2015, 2016 and 2018.


Kim, Wonil (Head of Department)

Kwon, Dongju

Lee, Chang Woo

Lee, Keun Woo

Lee, Sejung




Kumho Petro Chemical Co., Ltd.

Merck Sharp & Dohme Corp.



Salvatore Ferragamo S.p.A.

Siemens AG

SK hynix, Inc.

SK Innovation

Articles, Highlights and Press Releases

Total 1 Articles, Highlights and Press Releases

Yoon & Yang Bolsters Capabilities in TMT Sector

Jaebum Seok, Sugyoung Yi, Soongki Yi, Kwang-Wook Lee, Yong Hae Lee

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