Danny Yoon

Danny Yoon
Patent Attorney/Partner







Practice Area

  • Software, Robot, Mobile Service, Electronic Device, Fashion, Entertainment


  • 2001 Passed the Korean Patent Bar Examination


  • 2019 Korea National Open University, College of Social Science (LL.B., Law)
  • 2002 Seoul National University, College of Engineering (B.E., Electrical Engineering)
  • 1995 Seoul Science High School

Danny is a founder and the managing partner of SEUM IP.  He has over twenty year experience in strategic IP counseling on patent and trademark matters in the field of computer software, mobile services, robots, medical devices, business models, blockchain/cryptocurrency, fashion and entertainments.

Danny represents a variety of clients including start-ups, emerging tech companies, public and multinational corporations in prosecution of patent/trademark applications, trials and litigations.  He has extensive experiences in purchasing/selling patents and trademarks and has contributed to the clients' success in IP disputes and contracts by tough and moderate negotiation strategies.

Danny is active in the start-up community and a co-founder of a tech startup accelerator where he has contributed to finding high-potential start-ups, accelerating them and establishing innovative programs for co-building tech-centric startups.

Prior to SEUM IP, Danny filed and prosecuted patent applications, dealt with patent litigations, and protected trade secrets at KIM & CHANG on behalf of global companies, and built patent portfolios for many Korean domestic companies at SU IP and MOA IP and shared experiences with the clients while they grew up and achieved business exits.

  • 2021-Present
  • 2016-21
    MOA IP
  • 2006-16
    SU IP
  • 2003-06
  • 2002-03
    NAM & NAM
Representative Matters

[1] Handling patent disputes in the fields of software and electronic devices

  • Represented Naver, Fairchild, Applied Materials, LG U+, Hitachi, Toshiba, etc.
  • Represented Korean and foreign companies (S company, X company, T company, B company, etc.)

[2] Handling trademark disputes in the fields of fashion, entertainment and information technology

  • Represented Samsung Corporation, Handsome, YG Entertainment, etc.
  • Represented Fast Retailing, 10 corso como, IRO, Carven, etc.
  • Supervised Qoo10 trademark litigations in China
  • Purchased trademarks and negotiated for licensing deals in relation to disputes

[3] Building global patent portfolios and preparing for patent disputes

  • Represented SiRF against Qualcomm for GPS patents, and purchased patents for defensive use
  • Filed and prosecuted patent applications related to Android OS licenses on behalf of Microsoft
  • Filed and prosecuted search advertisement patent applications to be licensed out, on behalf of Overture
  • Filed and prosecuted patent applications for BYD
  • Built patent portfolios for Korean famous startups (O company, B company, C company, H company, etc.)

[4] Building patent portfolios for startups' business exits

  • Represented W company till its being listed in Kosdaq
  • Assisted O company till its being merged and acquired by a foreign large company
  • Assisted K company till its being merged and acquired by a Korean large company

[5] Assisting startups to do IP-driven growth

  • Co-developed patents for outbound licenses on behalf of M company
  • Co-developed patents and helped them be sold to Kosdaq-listed D company
  • Assisted K company in selling off its patents to Naver
Publications and Activities
  • Member of INTA (International Trademark Association)
  • CEO of Secondhands Inc. (2019-Present)
  • Co-founder & Partner at Futureplay Inc. (2014-19)
  • External Consultant for KOCCA (2010-Present)
  • Member of the Korea Patent Attorneys Association (KPAA) (2004-Present)
  • Korean, English, and Japanese