How to Do a Free Patent Search in India Before Filing

Why Search Before You File

A patent can give you exclusive rights for 20 years, but only if your invention is new and involves an inventive step. India follows an absolute novelty standard: if the same idea has been disclosed anywhere in the world before your filing date, in a patent, a paper, a product listing or even your own conference talk, your application can be rejected.

A few hours of searching can save you thousands of rupees in government and professional fees, one to three years of prosecution, and the far worse outcome of building a business on an idea someone else already owns.

Step 1: Write Your Invention Down First

Before opening any portal, put four things on paper:

• A working title, e.g. "portable solar charger with foldable panel"
• The field, e.g. renewable energy, electronics
• The key features that make it different, e.g. foldable panel, USB-C output, alloy body
• Similar products you already know of, from shops, Amazon or trade fairs

You are not drafting claims yet. You just need a clear summary to pull search keywords from.

Step 2: Run It Through Our Free Search First

The fastest first pass is the one we built for exactly this moment: ISERD India's Worldwide Prior-Art Search. Type your invention in your own words and it builds the search queries for you, covering Indian and international patent data in one go, free, with no signup. Pair it with the free Novelty Check, which turns the results into a structured report you can actually act on, and which does not store or train on your idea.

Ten minutes here tells you whether your idea has an obvious problem before you invest an evening in manual searching. Whatever it finds, verify the important hits on the official portal next.

Step 3: Verify on InPASS, the Official Indian Patent Database

Go to iprsearch.ipindia.gov.in/publicsearch. This is InPASS (Indian Patent Advanced Search System), run by the office of the Controller General of Patents, Designs and Trade Marks. It is free and needs no registration.

Start broad, then narrow

Search your main keywords in Title, Abstract and Claims. For our example: solar charger foldable. Patents often hide the useful detail in the description rather than the title, so do not rely on title-only searches.

Use AND, OR, NOT

• solar AND charger AND foldable to combine ideas
• foldable OR collapsible OR folding to catch synonyms
• solar charger NOT vehicle to cut noise

Long natural-language phrases work poorly here. Short keyword combinations work better.

IPC classes, if you know them

Every patent is filed under an International Patent Classification code. If you can identify yours on WIPO's IPC portal, adding it sharpens the search considerably. If not, keywords alone are fine to start.

Step 4: Read What You Find, Especially the Claims

Open each result that looks close and read the title, abstract and then the claims. The claims are the legal boundary of what is protected. If a granted patent's claims cover your exact key feature, that is a blocking patent. If the overlap is partial, note exactly which feature overlaps; that detail decides whether you can design around it.

Then repeat the search with synonyms ("panel" vs "array", "device" vs "apparatus") and check Google Patents for filings outside India. Foreign patents and publications count as prior art in India too.

Step 5: Check the Official Patent Journal for Fresh Filings

The Patent Office publishes a weekly journal of newly published applications at search.ipindia.gov.in. Skim it for your field if your area is fast-moving.

One honest limitation to know: applications stay unpublished for 18 months after filing. Nobody, not even a paid professional search, can see those. A clean search result reduces your risk substantially but can never make it zero.

Step 6: Search Beyond Patents

Prior art is not only patents. Any public disclosure before your filing date counts, whether it was last month or twenty years ago. Check:

• Google Scholar for research papers
• YouTube for product demos in your field
• Amazon, Flipkart and manufacturer sites for products already on sale

What If Something Close Already Exists?

• Design around it. Change your product so it falls outside the blocking claims. This is the most common outcome and often produces a better invention.
• License it. Contact the patent owner for permission to use it.
• Check the expiry. Patents lapse 20 years from filing, and earlier if renewal fees stop being paid. An expired or lapsed patent is free for anyone to use.
• Oppose it. If you believe a pending or granted patent should never have been allowed, Indian law provides pre-grant and post-grant opposition routes. Take professional advice before going down this road.

Your Pre-Filing Checklist

• Ran the idea through the free Prior-Art Search and Novelty Check on iserdindia.org
• Searched InPASS with at least three keyword combinations
• Checked synonyms and alternate spellings
• Checked Google Patents for filings outside India
• Skimmed the weekly journal for recent publications in your field
• Searched papers, videos and marketplaces for non-patent disclosures
• Read the claims of every close result and noted the overlaps
• Kept a log of what you searched and found

Keep a Search Log

A simple spreadsheet is enough: date, keywords used, number of results, the close ones, and one line on why each does or does not block you. If your application is questioned later, this record shows you did your homework, and it makes your patent agent's job faster and cheaper.

Ready for the Next Step?

If your search comes back clean, the usual next move for an individual inventor is a provisional application to lock in your filing date.

And pick the right depth of search for who you are:

• Individual inventors and students: the free Prior-Art Search and free Novelty Check cover the first pass end to end, at no cost, and your idea is never stored or trained on.
• Educational institutions and industry: our advanced Novelty Check tier reads and judges the documents themselves, the way an examiner would, and produces examiner-style reports at scale. Institutional subscriptions are opening shortly; write to info@iserdindia.org for early access.