The Legal 500

Twitter Logo Youtube Circle Icon LinkedIn Icon
Work +82 2 3703 1114

Duck Soon Chang

Work +82 2 3703 1830
Kim & Chang

Work Department

Intellectual Property, Antitrust & Competition, Mergers & Acquisitions, Insurance, International Arbitration & Cross-Border Litigation, IP Litigation, Trademark, Antitrust & Competition Litigation, International Litigation, Intellectual Property Litigation, Product Liability & Consumer Claims, IP & Technology Transactions


Duck-Soon Chang is an attorney at Kim & Chang. His principal practice areas include IP litigation, technology licensing, antitrust, and international arbitration.

Mr. Chang is currently the president of the Intellectual Property Training Institute of the Seoul Bar Association and a committee member of Korean Internet Address Dispute Resolution Committee. He was an advisor on IP related policies at Korea Fair Trade Commission from 2011 to 2014, and he also served as an advisor to the Korea Trade Commission (an equivalent to the USITC) on IP matters from 2008 to 2011. In addition, he spent several years as the outside director of Yuhan Corporation, Seoul, Korea. He now has more than 20 years of experience as an arbitrator for the Korea Commercial Arbitration Board.

Mr. Chang has been recommended as a Band 1 IP attorney for Korea by Chambers Asia since 2008 and has been selected as one of the world’s most preeminent patent lawyers by the International Who’s Who Legal every year since 2009.

Mr. Chang graduated from Seoul National University with a Bachelor of Laws degree and received an LL.M. degree from Harvard Law School. He is admitted to the Korean Bar and the Bars in the States of New York and California. He was a foreign attorney at Latham & Watkins from 1999 to 2000.


Korean and English


Admitted to bar, Korea, 1985; New York, 1991; California, 1991


Harvard Law School (LL.M., 1990)
Judicial Research and Training Institute of the Supreme Court of Korea (1984)
College of Law, Seoul National University (LL.B., 1983)

South Korea: Intellectual property

Intellectual property – Local firms

Within: Intellectual property – Local firms

Jay Young-June Yang leads Kim & Chang’s substantial and prominent IP practice, which remains the ‘top-choice’ for international pharmaceutical companies and international brands; the practice is well known for its strength in litigation and in a recent landmark case, Bo Hyun Park and Duck Soon Chang successfully defended Astellas Pharma against challenges to the patent term extension, the first Korean case in which the court issued specific guidance regarding the proper calculation method for determining the PTE term. Young Kim has an impressive track record in pharmaceutical patent litigation; she and Yu-Seog Won have defended one of Pfizer’s top-selling drugs, Lyrica, in various patent actions against generic companies. Sang-Wook Han is experienced in advising Japanese clients. For trade mark and design matters, Sung-Nam Kim, Ann Nam-Yeon Kwon, Angela Kim and John J Kim all have substantial experience in prosecution, enforcement and portfolio management. In patent litigation, Jong Seok Kim, Bong Seop Kim and Kum Uk Lee successfully represented AT Solutions in invalidating the patents of a competitor.

[back to top]

Back to index

Legal Developments by:
Kim & Chang

Legal Developments in South Korea

Legal Developments and updates from the leading lawyers in each jurisdiction. To contribute, send an email request to