Atthachai Homhuan

Manager, Regulatory Affairs
Download vCard
T: +66 2056 5610
F: +66 2056 5678




Thai, English


PhD, Mahidol University

BSc, Chulalongkorn University

Dr. Atthachai Homhuan is a manager, regulatory affairs, at Tilleke & Gibbins. Atthachai assists chemical, life sciences, pharmaceutical, and biotechnology companies to draft and review their patent claims and specifications. He advises patent agents on amending claims and providing responses to office actions. Atthachai frequently drafts counterstatements against opposing parties in trademark and patent applications. His practice also includes advising on pre-litigation and litigation matters involving the life sciences, medical devices, and pharmaceuticals. He has presented before the IP&IT Court as a witness in chemistry and life sciences patent litigation.

In addition to patent work, Atthachai prepares healthcare product dossiers for registration and he helps international companies develop market entry strategies for countries in Southeast Asia. His broad experience allows him to evaluate the feasibility of product registrations, conduct plant audits, and coordinate pre-clinical and clinical trials in accordance with international guidelines and standards. Atthachai also reviews healthcare product labeling for food, cosmetics, medical devices, and drug products in Thailand and other Southeast Asian countries.

Prior to joining the firm, Atthachai was a postdoctoral researcher in Japan and Taiwan, focusing on stem cell therapies and vaccine development. He applied his technical expertise to the industry when he became a project manager for a Thai vaccine manufacturing company, where he led the firm’s R&D efforts. His industry background also includes serving as a formulation manager at the subsidiary of a well-known American pharmaceutical innovator, where he was a group leader in charge of the company’s R&D and production functions.

Atthachai holds a PhD in Pharmaceutical Technology from Thailand’s Mahidol University, and he frequently lectures on pharmaceutical and chemical patents at universities across Thailand. He has completed the South East Asian Drafting Training Couse, enabling him to prepare patent applications and claims.

  • Revised guidelines for Thai patent officers examining chemical and pharmaceutical patents.

  • Implemented a quality system and GMP-related topics for the manufacturing of vaccines. This involved working closely with the Department of Medical Sciences of the Thai FDA in regard to biohazard manufacturing, ex-plan audit, in order to obtain approval.

  • Participated in conducting clinical trials and bioequivalence studies for new drugs and conventional products, and ensured the trials/studies and protocols were in accordance with the Good Regulatory Practices and Good Clinical Practices.

  • Co-invented several pharmaceutical products regarding liposomal vaccines and stem cell therapy, each of which is patented in Japan.

  • Assisted life sciences and chemical companies to draft a variety of complex patents involving the manufacturing process of creating polymers from waste gas and patents related to biological vaccines, among others.

  • Audited leading pharmaceutical companies to ensure that their product registration dossiers and advertising campaigns comply with Thai legislation.

  • Registered new biological product dossiers at the Thai FDA and received approval within 1.5 years—a short period of time to obtain approval for a new drug in Thailand.

  • Registered medical devices, food products, and cosmetics with the Thai FDA for domestic and international companies.

  • Worked with the firm’s litigation team and won a disputed patent litigation case for a chemical glass company, in which the opposing party claimed damages exceeding THB 50 million.

Datesort icon Title
November 6, 2020

Tilleke & Gibbins Nominated for Three Women in Business Law Awards Asia-Pacific 2020

Tilleke & Gibbins has been nominated in three firm-wide categories in the Women in Business Law Awards Asia-Pacific 2020. The awards, which are organized each year by Euromoney to recognize firms...

Read more

October 29, 2020

AMCHAM Thailand Recognizes Tilleke & Gibbins at 2020 CSR Excellence Awards

On Tuesday, October 27, Tilleke & Gibbins was singled out for an award for exceptional corporate social responsibility (CSR) work during the past 12 months at the 2020 CSR Excellence Awards, held...

Read more

October 5, 2020

Atthachai Homhuan Interviewed by Cannabis Law Report

Atthachai Homhuan

On October 5, 2020, the Cannabis Law Report published an in-depth interview with Dr. Atthachai Homhuan, a manager in Tilleke & Gibbins’ regulatory affairs practice. The interview covers the...

Read more

September 21, 2020

Asialaw Profiles 2021: Tilleke & Gibbins Dominates the Thailand Rankings

The recent publication of Asialaw Profiles 2021, a guide to the leading Asian law firms, saw Tilleke & Gibbins further maintaining its dominance of the legal market in Thailand. The firm earned...

Read more

September 3, 2020

Tilleke & Gibbins Earns 15 Nominations for ALB’s 2020 SE Asia Law Awards

Asian Legal Business  (ALB ) has announced its nominations for the 2020 SE Asia Law Awards, and Tilleke & Gibbins has received a record 15 nominations this year—more than double...

Read more

Datesort icon Title
November 17, 2020

Practical Law Life Sciences Global Guide: Medicinal Product Regulation and Product Liability in Thailand (November 2020)

Alan Adcock, Atthachai Homhuan, Siraprapha Claassen

The Thailand updates to the Practical Law's Life Sciences Global Guide  have been published, with attorneys from Tilleke & Gibbins providing answers for the Medicinal Product Regulation and...

Read more

November 17, 2020

Practical Law Life Sciences Global Guide: Pharmaceutical IP and Competition Law in Thailand (November 2020)

Alan Adcock, Atthachai Homhuan, Siraprapha Claassen

The Thailand updates to Practical Law’s Life Sciences Global Guide  have been released online, with legal practitioners from Tilleke & Gibbins contributing the Pharmaceutical Intellectual...

Read more

September 16, 2020

COVID-19 Resource Center

As the global COVID-19 situation develops, Tilleke & Gibbins is dedicated to ensuring that our clients remain up to date on the most important legal developments in Southeast Asia as they happen...

Read more

September 1, 2020

Thailand Readies Draft Notification to Allow Hemp-Based Ingredients for Food Innovation

San Chaithiraphant, Atthachai Homhuan

The cannabis industry in Thailand took its first concrete step in February of 2019, when medical cannabis was unexpectedly legalized. In August 2019, a Ministry of Public Health (MOPH) notification...

Read more

May 13, 2020

Tilleke & Gibbins Cannabis and Hemp Business Guide – Thailand

Alan Adcock, Atthachai Homhuan, San Chaithiraphant

Attorneys in Tilleke & Gibbins’ regulatory affairs team have produced the Cannabis and Hemp Business Guide – Thailand, a primer on the rapidly developing cannabis industry in Thailand. Cannabis...

Read more