Furthermore, the applicant must be a Thai national or a national of a member state of the treaty, or is domiciled in Thailand or domiciled in a member state of the treaty to be eligible to file a PCT application in Thailand. If the applicant is not a resident in Thailand, he shall appoint an agent who has been registered with the director-general of the Department of Intellectual Property to act for him in the country. A notarised power of attorney shall be filed with the director-general within 90 days from the national phase entry date.

Apart from the above-mentioned requirements, namely full Thai patent specification and notarised power of attorney, other requirements for a PCT application to enter into the Thailand national phase include:

• Name, address and nationality of applicant. If the applicant is a company, place of incorporation must be furnished.
• Name, address and nationality of inventor.
• PCT application number.
• Priority application number, date of filing and country.
• Original Patent specification, claims and drawings in English.
• Amended claims, if any, filed during the international phase.
• PCT/IB/304 (notification concerning submission, obtention or transmittal of priority document)
• Original statement of applicant's right, if the applicant is the inventor. This can be submitted later but not later than 90 days from the national phase entry date.
• Original deed of assignment, if the applicant is not the inventor. This can be submitted later but not later than 90 days from the national phase entry date.

A Thai patent is effective for a total term of 20 years from the filing date with payment of annuities starting from the fifth year.