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Manoon Changchumni



+662 028 2244


Manoon is a Principal responsible for IP contentious matters and litigation.

Manoon is a qualified Thai Patent Agent and Attorney at Law with over eighteen years' intellectual property (IP) experience in Thailand.

Manoon advises on trademark, patent and design disputes. He also supervises the management of patent and design portfolios, and lectures on patents at universities and government institutions. 

He handles a wide range of matters relating to IP law, including patent and trademark registration, oppositions, appeals, cancellations, preparation and recordation of license agreements, and advising in relation to acquisitions and compulsory licensing issues and negotiating in relation to conflicts.

He also has solid experience in anti-counterfeit cases, including conducting raid actions. He represents numerous clients in the consumer products business, as well as clients in the food and beverage, cosmetics, electronics, automobile, and entertainment industries.


  • LLB, Ramkhamhaeng University, Thailand
  • Summer IP Program, IP Summer Institute, United States of America
  • Advanced IP Licensing Programme, Advanced Licensing Institute of Franklin Pierce Law Center, United States of America
  • IP Rights Training Course, Association for Overseas Technical Scholarship and Japan Institute of Invention and Innovation (JIII), Japan
  • Notarial Services Training Course, Lawyers Council of Thailand, Thailand


  • International Trademark Association
  • Intellectual Property Association of Thailand


  • Chambers Asia-Pacific, 2023: Band 3
  • WTR 1000, 2020: Tier 2 for Enforcement and Litigation
  • IAM Patent, 2019: “Recommended Individual”
  • Chambers Asia-Pacific, 2018: Listed as “Notable Practitioner”