Yoon & Yang LLC’s IP practice, headed by Dongju Kwon, is well-versed in patent, copyright, and trade mark disputes, as well as trade secret and infringement matters. The team has been notably strengthened by the addition of Geonyoung Koh, a former prosecutor and software engineer. Koh brings substantial expertise in complex cases involving cryptocurrency theft, hydrogen fuel cell tech leakage, and OLED cleaning equipment tech leakage, enhancing the firm’s capabilities in handling high-stakes IP issues across diverse industries.

Legal 500 Editorial commentary

Testimonials

Collated independently by Legal 500 research team.

  • ‘Yoon & Yang have good teams because they are systematic and cooperative among themselves for the clients. Especially, they have professionals for every industrial field, and they give comfort and warmth to the clients by understanding and generosity.’

  • 'Yoon & Yang IP Group has experts with extensive litigation experience who worked at the Patent Court and the Supreme Court, and also has pharmacist attorneys, providing excellent services in various aspects from a technical and litigation strategy perspective.’
  • ‘Dongju Kwon demonstrated success in their appellate strategy by meticulously formulating and timely submitting briefs, resulting in the dismissal of the trial.'

  • 'Dong-ju Kwon has shown a deep understanding of the Supreme Court and Patent Court's organisation, and they were able to grasp detailed information about changes in court organisation ahead of other law firms.’
  • ‘Yoon & Yang has been our legal advisor for various matters such as trade mark infringement. Each team demonstrated their strength in handling high-profile cases by addressing our needs accurately and effectively. We were satisfied with how they resolved the issues. We felt that Yoon & Yang’s experts are trusted advisors in that their team is led by experts who were former judges, former prosecutors, and experienced lawyers and that the team have represented the largest companies with diverse legal issues.’

  • ‘The team has a very high level of understanding of pharmaceutical companies and patents and have good communication with clients. Alternatives provided by accommodating the client's position and the team's atmosphere appears to be flexible, and there is good communication between the members, and this seems to lead to good results.’

  • ‘The lawyer who represented our case as a lead counsel, who is a former judge, is outstanding. One of the intellectual property team members, who showed a great performance with ample knowledge, is a lawyer with a degree in pharmacy.’

Key clients

  • SK Innovation Co., Ltd.
  • Merck & Co Inc
  • W-Scope Korea Co., LTD.
  • SK Hynix Inc.
  • SK Bioscience Co., Ltd
  • SK Chemicals Co., Ltd.
  • Hanmi Pharm. Co., Ltd.
  • Kolon Life Science Inc
  • Medy-Tox Inc
  • Kumho Petro Chemical Co.,ltd
  • SK Shipping Co., Ltd
  • Hyundai Mobis Co.,ltd
  • OTIS Elevator Korea
  • Sumitomo Chemical
  • Toyota Motor Corp
  • Dyson Korea Limited
  • REG Life Sciences
  • HITE Jinro
  • E-mart inc.
  • Yuhan Corporation

Work highlights

  • Represented Hanmi Pharm and successfully contested the validity and scope of Novartis AG's "ENTRESTO" patent at IPTAB.
  • Successfully represented W-Scope in a patent dispute against Asahi Kasei Korea.
  • Defending Hyundai Mobis in a patent infringement case brought by Autoliv ASP, Inc. over airbag cushion technology while also challenging the validity of Autoliv's patents.

Practice head

The lawyer(s) leading their teams.

Dongju Kwon

Other key lawyers

Wonil Kim, Keun Woo Lee, Sejung Lee, Chang Woo Lee, Geonyoung Koh