Patent Filing in Thailand
File your PCT national phase application in Thailand with the Department of Intellectual Property (DIP) (Thailand) through AnalystIP, within 30 months from the priority date. Every requirement below is taken from the WIPO PCT Applicant's Guide and kept up to date by our team.
When is your national phase deadline in Thailand?
Enter the earliest priority date of your PCT application (or the international filing date if there is no priority).
Patent filing in Thailand: key facts
Reinstatement of rights permitted under the 'due care' criterion; fee 50 THB.
None listed
Request examination within five years from publication.
20 years from the international filing date
Due every year from the 5th year, once the patent is granted.
Official fees for patent filing in Thailand
Filing in several countries? Compare fees with other countries →
Standard official fees (general)
From the WIPO PCT Applicant's Guide, updated 15 August 2024. Amounts in THB. Your exact fees depend on your application: use the calculator above.
| Fee | Amount | Notes |
|---|---|---|
| Filing fee (patents) | THB 500 | |
| Filing fee (petty patents) | THB 250 |
Fee reductions: None listed
National phase entry requirements
Time limit
30 months from the priority date (Articles 22(1) and 39(1)(a)); same for Chapter I and II
Translation
Under Article 22: request, description, claims (as filed and as amended, with any Article 19 statement), text matter of drawings, abstract. Under Article 39(1): request, description, claims, text matter of drawings, abstract (as filed and as amended by the IPER annexes). Incomplete translation: invitation to supply missing part, otherwise deemed withdrawn.
Late entry and reinstatement
Reinstatement of rights permitted under the 'due care' criterion; fee 50 THB. Written request within two months of removal of the cause or 12 months after expiry of the time limit, whichever is earlier, completing the omitted act with a supporting declaration or evidence. Restoration of priority accepted under 'due care'.
Agent and power of attorney
Required for non-resident applicants (signed power of attorney); any patent attorney or patent agent registered with the Office.
Special requirements of the office
- Name and address of the inventor, if not in the request (may be satisfied by a Rule 4.17 declaration; 90 days from invitation)
- Document evidencing any change of applicant name
- Statement justifying the applicant's right to the invention (may be satisfied by a Rule 4.17 declaration)
- Appointment of an agent (non-residents) and power of attorney if an agent is appointed
Other information
- Annex TH.I patents: publication fee 250; request for examination 250; registration 500; additional fee for furnishing documents after entry 50; annual fees 5th year 1,000 to 20th year 25,000 THB (single payment 140,000)
- Annex TH.I petty patents: publication and registration 500; request for examination 250; annual fees 5th 750, 6th 1,500 THB
- Fees paid in THB (cash at DIP, Krungthai Bank transfer, or cheque)
- Petty patent may be sought instead of a patent; conversion possible
- Colour drawings not accepted
Source: WIPO PCT Applicant's Guide, national chapter, updated 15 August 2024.
What you need to file in Thailand
A notarized power of attorney, filed within 90 days from the filing date.
Filing requirements in detail
| Extension of the filing deadline | No |
|---|---|
| Late translation allowed | Yes/3 Months after Filing |
| Amendments at entry | Possible |
| Article 19 amendments | Possible |
| Chapter II / Article 34 amendments | Possible |
| Power of attorney | Notarized POA/ Within 90 Dyas from the app. Filing date |
Patent filing in Thailand: questions
What is the deadline for PCT national phase entry in Thailand?
30 months from the earliest priority date.
Can I enter the national phase in Thailand after the deadline?
Reinstatement of rights permitted under the 'due care' criterion; fee 50 THB. Written request within two months of removal of the cause or 12 months after expiry of the time limit, whichever is earlier, completing the omitted act with a supporting declaration or evidence. Restoration of priority accepted under 'due care'.
In which language must the application be filed in Thailand?
Thai. Under Article 22: request, description, claims (as filed and as amended, with any Article 19 statement), text matter of drawings, abstract. Under Article 39(1): request, description, claims, text matter of drawings, abstract (as filed and as amended by the IPER annexes). Incomplete translation: invitation to supply missing part, otherwise deemed withdrawn.
Do I need a local patent attorney in Thailand?
Required for non-resident applicants (signed power of attorney); any patent attorney or patent agent registered with the Office.
Is a power of attorney needed, and must it be legalized?
A notarized power of attorney, filed within 90 days from the filing date.
Are there official fee reductions in Thailand?
None listed
How does examination work in Thailand?
Request examination within five years from publication.
How much does patent filing in Thailand cost?
The cost is the official fees of the patent office plus professional fees. The standard official fees from WIPO are listed on this page; the calculator works out the exact official fees for your application (pages, claims, applicant type) after a quick email check, and our team sends a full quote on request.
File in Thailand with AnalystIP
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