A patent search is the process of checking existing patents, petty patents, and other published documents (prior art) to assess whether your invention is new enough to register. It is not a legal requirement, but a recommended practice that reduces the risk of spending time and fees on an application likely to be rejected. You can search for free yourself through Thailand's DIP database and free international databases, or use a professional search service once your invention is more developed or commercially significant.
What is a patent search
A patent search looks for prior art — such as patents, petty patents, published applications, academic publications, and other relevant technical disclosures — that may affect the novelty or inventive step of an invention, assessed against the applicable filing or effective filing date. The result informs your decision on whether to file; it does not guarantee that a patent will be granted, since the application will ultimately be assessed by the Department of Intellectual Property based on the applicable legal requirements, the claims as filed or amended, and the prior art identified during examination.
Why search before filing a patent
The Patent Act B.E. 2522 requires an invention to have novelty under Section 6, an inventive step under Section 7, and industrial applicability under Section 8, within the overall patentability framework set out in Section 5. If prior art disclosing all the material elements of your invention was already disclosed to the public before your filing date — whether by someone else or by you — it can destroy novelty and lead to a rejected application. Prior art that is only partially related or merely similar may not by itself destroy novelty, but can still be relevant to the assessment of inventive step. Searching in advance lets you find out about these risks before spending time and fees on an application unlikely to succeed.
Thai patent law generally does not require an applicant to prepare a patent search report before filing or impose a prior-art disclosure obligation equivalent to the formal duty of disclosure found in certain jurisdictions. Applicants must nevertheless provide accurate and complete information and documents as required during filing and examination.
Patentability Search vs. Freedom-to-Operate (FTO): what's the difference
These two terms are often assumed to mean the same thing, but they answer different questions:
- Patentability Search answers "is my invention new enough to be patented?" — compared against all prior art, whether still in force or already expired.
- Freedom-to-Operate (FTO) answers "would making, using, or selling my product infringe someone else's patent?" — compared only against patents still in force in the countries where you intend to operate.
A key caution: an invention being "patentable" does not mean it can be made or sold without infringing anyone. An invention new enough to earn its own patent can still overlap with the claims of another party's still-active patent. The two analyses answer different questions, and FTO carries substantially higher legal complexity and risk than a patentability search, since it requires directly interpreting the claim scope of someone else's patent. This should be evaluated by a professional, not concluded from a keyword search of a database alone. Read more in What Is Freedom-to-Operate (FTO)? How Is It Different From a Patentability Search?
When to search
Search early — ideally at the start of development, before investing further or filing — so there's still time to change direction if closely related prior art turns up. The later you search, the more expensive it becomes to discover that your invention overlaps with something that already exists.
Thai and international patent databases
You can run a preliminary search yourself, free of charge, through official databases:
- Thailand: the Department of Intellectual Property's own search system (search.ipthailand.go.th), covering patents, petty patents, and design patents filed in Thailand.
- International: WIPO's PATENTSCOPE (patentscope.wipo.int), covering international PCT applications and the collections of many national patent offices.
- Europe: Espacenet, run by the European Patent Office (worldwide.espacenet.com), covering patent documents from over 100 countries.
- United States: the USPTO's Patent Public Search (ppubs.uspto.gov), for patents granted or filed in the US.
Limitations of searching it yourself
A self-run search has real limitations worth knowing before you draw conclusions from it: keyword searches can miss documents that describe similar subject matter using different technical terms; interpreting the claim scope of a patent you find requires specialized legal and technical understanding; and no single database covers 100% of everything ever published worldwide. A search provides information and an assessment based on the defined scope, databases, search strategy, and information available as of the report date. It does not guarantee the outcome of examination or freedom from third-party patent rights.
When a professional search is the right call
A free self-search is a reasonable way to sanity-check an idea early on. As your invention gets closer to a real filing, involves higher technical complexity, spans multiple countries, or represents an investment large enough that missing a piece of prior art would be costly, a professional search — with an agent who can interpret the results and assess risk systematically — becomes the more appropriate choice. See the full breakdown of factors in DIY Patent Search or Hire a Professional? Factors to Consider.
