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Piyawat Kayasit

Senior Associate


Piyawat Kayasit is a litigator in Tilleke & Gibbins’ intellectual property group in Bangkok. Piyawat has specialized in IP enforcement and dispute resolution for almost 20 years. He handles a wide range of IP and commercial litigation matters and advises on high-level strategies to protect his clients’ valuable IP rights. Piyawat has extensive experience in drafting and reviewing IP-related commercial contracts, as well as defending erroneous accusations concerning contractual and IP violations. He manages and protects the IP portfolios of many world-renowned companies.

Piyawat is a frequent writer on IP-related subjects, and he regularly speaks on IP at conferences and seminars. He is fluent in both Thai and English.


  • Represented a lock manufacturer in an overseas anti-counterfeiting campaign. Coordinated raids with local counsel and officials against factories, distributors, and retailers.
  • On behalf of large consumer products companies, well-known studios, and other international companies, secured successful outcomes from the Supreme Court in appeal cases from the Board of Trademarks.
  • Successfully defended a mobile phone manufacturer and a digital map company against copyright infringement claims.
  • Acted for a leading manufacturer of construction products in multiple disputes over a rebar patent. Convinced the police and the public prosecutor to drop the patent infringement charges and successfully cancelled the opposing party’s patent.
  • Provided advice to a sugar producer on trademark licensing issues with its former affiliates, helping them settle the matter out of court.
  • Advised pharmaceutical companies on compulsory licensing and assisted them in coordinating with government officers.
ABOUT Piyawat








    LLM, University of Washington

    LLB, Ramkhamhaeng University


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