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Intellectual Property Rights - Law and Practice · Patent Databases and Patent Information System

Patent Databases and Search Tools for Prior Art Search

Updated 11 October 2026 · Fact-checked

A patent database is an online collection of patent documents that you can search by number, name, date, class or keyword. Key ones are InPASS (India), PATENTSCOPE (WIPO), Espacenet (EPO), USPTO and Google Patents. To solve a question, name the right database for the purpose, the search fields, and the legal use of the result.

Understand Patent Databases and Search Tools

A patent system works only if people can read what has already been patented or published. Patent offices therefore publish applications and grants, and databases make them searchable. You use them to check novelty, track competitors, find expired or pending rights and study technology trends.

Databases differ by coverage. InPASS is the Indian Patent Office's public search system, so it is the first stop for Indian applications and patents, for example by application number, applicant name or title. WIPO PATENTSCOPE covers international (PCT) applications and many national collections. Espacenet, run by the European Patent Office, covers a very large worldwide collection and is strong for family and classification searches. The USPTO site covers US patents and applications. Google Patents is free and easy for keyword searches across many countries. Paid tools add analytics, translation and alerts. Coverage and features change, so state them in general terms.

A prior art search looks for anything published anywhere before the filing date that could anticipate the invention. The law reflects this. Section 13 of the Patents Act, 1970 requires the examiner to investigate whether the invention, as claimed, has been anticipated by prior publication in India or elsewhere. It also covers earlier-filed Indian specifications published later with an earlier priority date. Section 13(4) says the examination and investigation do not warrant the validity of any patent, and the Government incurs no liability for them. So a search result is evidence, not a guarantee.

Searching has a legal side too. Under section 39, a person resident in India cannot file a patent application outside India without a written permit, unless an Indian application for the same invention was made at least six weeks earlier and no section 35(1) direction is in force, or all such directions are revoked. A database search before foreign filing should therefore include checking your own Indian filing. The priority rules also matter when reading families: under section 137, with multiple convention applications, one application may be made within twelve months from the earliest basic application, and the priority date of a claim is when that matter was first disclosed.

Good searching combines methods: bibliographic (number, applicant, inventor), keyword, and classification (IPC or CPC) searches. Use several databases, because no single one is complete.

Key rules to remember

Prior art scope under section 13(2)
Anticipation by publication in India or elsewhere, before the date of filing of the complete specification
The examiner's search is not limited to Indian documents.
Section 13(4) disclaimer
Examination and search ≠ warranty of validity; no Central Government liability
Use this when asked whether a search guarantees a valid patent.
Foreign filing by residents (section 39)
Indian application at least 6 weeks earlier + no section 35(1) direction in force (or revoked), or a written permit from the Controller
Defence or atomic energy inventions need the Central Government's prior consent before a permit.
Multiple priorities (section 137)
One application within 12 months from the earliest basic application; priority date = date matter first disclosed
Helps you read patent families in databases.

How to solve Patent Databases and Search Tools questions

Use this order for any question on databases or search tools.

  1. 1Identify the purpose: novelty search, status check, freedom to operate, competitor watch or foreign filing.
  2. 2Choose the database that fits: InPASS for Indian records, PATENTSCOPE for PCT applications, Espacenet or Google Patents for worldwide, USPTO for US.
  3. 3State the search fields: application number, applicant, inventor, title, abstract keywords, IPC or CPC class, dates.
  4. 4Explain the search method: start broad with keywords and classes, then narrow, and check patent families.
  5. 5Link to the law: section 13 for examiner's search, section 13(4) for no warranty, section 39 or 137 if foreign filing or priority arises.
  6. 6Conclude on the facts: what the search shows and the practical step, such as amending claims, filing or abandoning.

Quickest way: Purpose, database, field, law

When to use it: Short-answer or case questions where time is tight.

  1. Write the purpose in one line.
  2. Name two databases and say why each fits.
  3. List the fields you would search.
  4. Add one line of law, usually section 13 or section 39.
  5. Close with a one-line conclusion.

Common mistakes in Patent Databases and Search Tools

  • Treating one database as complete.

    Students memorise a single name such as Google Patents.

    Fix: Say that coverage varies and a proper search uses several databases and classification codes.

  • Saying a clear search proves the patent is valid.

    Confusing search with legal certainty.

    Fix: Cite section 13(4): examination and investigation do not warrant validity.

  • Limiting prior art to Indian documents.

    Focusing on InPASS only.

    Fix: Section 13(2) covers publication in India or elsewhere.

  • Confusing PATENTSCOPE and Espacenet.

    Both are free and international.

    Fix: PATENTSCOPE is WIPO's and is notable for PCT applications; Espacenet is the EPO's and is notable for its wide worldwide collection and family data.

  • Ignoring section 39 when a resident plans foreign filing.

    Treating search as separate from filing strategy.

    Fix: Check that the Indian application is at least six weeks old with no section 35(1) direction, or get a permit.

Worked examples

Example 1

Sundaram Tech Pvt Ltd, Chennai, has developed a new battery-cooling method. Advise how it should carry out a prior art search before filing.

Show the solution
  1. Purpose: check novelty before filing, so the search must cover India and abroad.
  2. Databases: InPASS for Indian applications; Espacenet, PATENTSCOPE and Google Patents for foreign and PCT documents.
  3. Fields: keywords describing the cooling method, plus IPC or CPC classes for batteries and thermal management.
  4. Method: begin broad, narrow by class and dates, then check families of relevant hits.
  5. Law: the Patent Office examiner will search under section 13, including publications in India or elsewhere, so the company should find the same documents first.
  6. Conclusion: refine the claims around what the search shows is new. The company must remember that its own search is not a guarantee of validity.

Answer: Search InPASS and international databases using keywords and classification codes, review families, and draft claims to avoid the prior art found. Section 13(2) makes worldwide publications relevant, and section 13(4) means no search guarantees validity.

Example 2

Meera Rao, resident in India, filed an Indian application on 1 March and wants to file in the US on 5 April the same year. No section 35(1) direction was given. Can she do so without a permit?

Show the solution
  1. Rule: under section 39, a resident needs a permit unless an Indian application for the same invention was made at least six weeks before the foreign filing and no section 35(1) direction is in force.
  2. Gap: 1 March to 1 April is 31 days, plus 4 more days to 5 April gives 35 days. That is five weeks, so less than six weeks.
  3. Six weeks is 42 days. Counting 42 days from 1 March gives 12 April (31 days to reach 1 April, plus 11 more days), so 12 April is the earliest date she can file in the US without a permit.
  4. Condition (b) is met, since no direction was given, but condition (a) is not met for a filing on 5 April.
  5. She may therefore wait and file in the US on or after 12 April, or seek a written permit from the Controller now.
  6. If the invention is relevant to defence or atomic energy, the permit needs the Central Government's prior consent.

Answer: No. The gap is 35 days, under six weeks (42 days). She can file in the US without a permit on or after 12 April, or she can obtain a written permit from the Controller to file earlier.

Exam tips

  • Name the database and its operator, and state its main use in one line.
  • Always add the legal hook: section 13 for searches, section 39 for foreign filing.
  • In case questions, follow provision, analysis of facts, conclusion.
  • Avoid claiming exact database sizes or features; keep coverage statements general.
  • Practise the section 39 six-week calculation with dates.

Practice questions from Patent Databases and Patent Information System

Patent Databases and Search Tools: frequently asked questions

How do I search InPASS by application number?

Open the InPASS search on the Indian Patent Office website and choose the application number or patent number search option. Enter the number in the format requested and submit. The result shows bibliographic details and status.

What is the difference between Espacenet and PATENTSCOPE?

Espacenet is provided by the European Patent Office and is widely used for worldwide collections and patent families. PATENTSCOPE is provided by WIPO and is notable for international PCT applications. Both are free and are best used together.

Which databases should I list in the CS Professional exam?

List InPASS, WIPO PATENTSCOPE, Espacenet, USPTO and Google Patents, and mention paid commercial tools generally. Give the operator and one use for each.

Does a prior art search guarantee my patent will be granted?

No. Section 13(4) says the examination and investigation do not warrant validity. A search only reduces risk by showing what is already published.