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Siriwan Phentalay

Senior Associate


Siriwan Phentalay is a senior associate in Tilleke & Gibbins’ intellectual property department. With 30 years of experience in the area of trademark registration, Siriwan is widely regarded as an expert in this field. She consults on trademark searches, trademark filing, and all stages of trademark registration, including appeal petitions and civil suits. She specializes in new applications for trademarks and service marks and in classifying the proper goods and/or services for trademark protection.

Siriwan is a member of the Intellectual Property Association of Thailand. In 2012, she completed the “Development of Specialist in Trademark Registration” course at the Thai Department of Intellectual Property.


  • Worked closely with leading multinational companies to implement effective strategies for trademark portfolio management in Thailand and overseas.
  • Filed trademark applications and collaborated with officials at Thailand’s Department of Intellectual Property to ensure smooth registration processes for brand owners in a wide range of industries.
  • Represented clients in maintaining and defending their trademark portfolios through recordal of changes/assignments, oppositions, cancellations, renewals, registration of trademark and service mark license agreements, watch services, and other related actions.
ABOUT Siriwan






    LLB, Sukhothai Thammathirat University

    BA, Kasetsart University


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