A Pune-based manufacturing company developed a new process for coating industrial components that significantly extended their operational life. They filed a patent application in good faith, paid the filing fees, and engaged a patent agent to draft the specification. Eighteen months later, the First Examination Report arrived: the process had been described in a Japanese patent application published three years earlier. The Indian application was rejected on novelty grounds. The filing fees not refundable. The professional fees already spent. The eighteen months gone.
A prior art search conducted before filing would have identified the Japanese publication in under an hour using WIPO PATENTSCOPE. Armed with that knowledge, the company could have modified their process to create a genuinely novel variation, framed their claims to distinguish from the Japanese prior art, or made a commercial decision not to pursue the application at all — before spending money on prosecution.
Patent search strategy is not a procedural formality. It is the foundation of every sound patent filing decision. This guide explains what types of patent searches exist, which databases to use, how to construct effective search queries, how to read a patent for prior art purposes, and what the novelty doctrine under the Patents Act, 1970 means for what counts as prior art in India.
The governing framework: Patentability in India requires that an invention satisfy three criteria under the Patents Act, 1970: novelty (the invention must be new), inventive step (the invention must not be obvious to a person skilled in the relevant field), and industrial applicability (the invention must be capable of being used in industry). A patent search primarily addresses the first two criteria by identifying what already exists in the public domain — the prior art — before the application is filed.
The Four Types of Patent Search
Why are there different types of patent searches, and when does each apply?
Not every patent search has the same purpose. A search conducted to assess whether your invention is novel before filing is structurally different from a search conducted to assess whether your competitor’s patent is valid. Understanding which type of search your situation requires is the first step in an effective patent search strategy.
1. Prior Art Search (Novelty Search / Patentability Search)
This is the most common type — conducted before filing to determine whether the invention is novel and, to some extent, whether it involves an inventive step. The searcher looks for any prior art reference — an earlier patent, a published paper, a product description, a conference presentation, or any other publicly available document — that discloses the same or substantially similar invention.
A prior art search serves two purposes simultaneously: it assesses patentability (is this worth filing?) and it informs claims drafting (how should the claims be framed to distinguish from what exists?). A clean search result — no close prior art found — supports a broad claims strategy. A search result that reveals closely related prior art suggests a narrower claims strategy that carefully distinguishes the novel features of the invention from what is already known.
When to conduct it: Before filing any patent application — ideally before investing significant resources in full specification drafting.
2. Freedom-to-Operate (FTO) Search
A freedom-to-operate search asks a different question: not “can we get a patent for this?” but “can we commercialise this product or process without infringing an existing patent that someone else holds?” A granted patent gives its owner exclusive rights to make, use, sell, or import the patented invention in India under Section 48 of the Patents Act. A company that commercialises a product covered by another party’s granted patent infringes that patent — regardless of whether the company itself holds any patents.
An FTO search identifies granted patents (not pending applications, which do not yet confer enforceable rights) in the relevant technology field and assesses whether the proposed product or process would fall within any claim of any live patent. If a granted patent covers the proposed activity, the options are: design around the patent, seek a licence, wait for the patent to expire, or challenge the patent’s validity.
When to conduct it: Before launching a new product, before scaling a manufacturing process, before entering a new geographic market, and as part of IP due diligence in M&A transactions.
3. Invalidity Search
An invalidity search is the adversarial counterpart to a prior art search. Where a prior art search is conducted before filing to assess your own application’s prospects, an invalidity search is conducted after a competitor’s patent has been granted, to find prior art that would have prevented the grant — and that can now support a post-grant opposition (Section 25(2)) or a revocation petition (Section 64) challenging the competitor’s patent.
An invalidity search is often more intensive than a standard novelty search because the stakes — invalidating a competitor’s patent — are higher. The searcher specifically looks for prior art references that the Examiner may have missed during the original examination.
When to conduct it: When facing an infringement claim from a patent holder, when a competitor’s patent creates an obstacle to commercialisation, or as part of a broader patent clearance strategy in a competitive technology field.
4. State-of-the-Art Search (Landscape Search)
A state-of-the-art or landscape search maps the entire patent landscape in a technology field — identifying who holds patents, which aspects of the technology are heavily patented, where the white spaces are (areas with little or no patent coverage), and which patent families are expiring in the near future. This is a strategic intelligence tool rather than a patentability tool.
When to conduct it: Before entering a new technology field, during R&D planning to identify white spaces worth targeting, and as part of IP portfolio strategy.
Key Takeaway: A prior art/novelty search assesses whether your invention can be patented. A freedom-to-operate search assesses whether you can commercialise without infringing others. An invalidity search challenges a competitor’s granted patent. A landscape search maps the strategic territory. All four are legitimate components of a comprehensive patent search strategy. Patent Registration Services — Unimarks Legal Solutions
The Search Databases: Where to Look
Which databases should an Indian inventor or company use for patent searches?
No single database covers all published patents globally. An effective prior art search uses multiple databases — each with different geographic coverage, different search interfaces, and different strengths for particular technology fields.
InPASS — Indian Patent Advanced Search System
URL: ipindia.gov.in/patentSearch.htm
InPASS is the Indian Patent Office’s public search database, providing access to Indian patent applications and granted patents. It is the essential starting point for any search focused on the Indian market — for both novelty searches (identifying prior Indian applications that could affect your application) and FTO searches (identifying live Indian patents that could affect your commercialisation).
InPASS supports searches by patent number, applicant name, inventor name, title, abstract, and IPC classification code. The database is periodically updated and reflects both published applications and granted patents. For any patent application filed with the Indian Patent Office, InPASS is the authoritative record.
Limitation: InPASS covers only Indian filings. A prior art search that relies solely on InPASS misses the vast majority of global prior art — which can be cited against an Indian application in examination.
WIPO PATENTSCOPE
URL: https://patentscope.wipo.int/search/en/search.jsf
WIPO PATENTSCOPE provides access to over 105 million patent documents from more than 100 countries — including Indian patents (through the IPO’s contribution to the PATENTSCOPE database), PCT international applications, and patents from the US, Europe, Japan, China, and most other major patent-filing jurisdictions. For prior art searches, PATENTSCOPE is the single most comprehensive freely available global database.
PATENTSCOPE supports full-text searching across patent titles, abstracts, descriptions, and claims. It also supports IPC classification searches and cross-lingual searching (searching in one language and retrieving results in multiple languages) — particularly useful for technology fields where significant prior art may be published in Japanese or Chinese.
For PCT applications specifically: All PCT international applications are published in PATENTSCOPE approximately eighteen months after the earliest priority date. If a competitor has filed a PCT application, PATENTSCOPE will reveal it at the eighteen-month publication mark — before the application enters national phase in individual countries.
Espacenet — European Patent Office
URL: https://worldwide.espacenet.com/
Espacenet is the European Patent Office’s patent search database, providing access to over 140 million patent documents. It includes European patents, PCT applications, and national patents from over 90 countries — with particularly strong coverage of European, US, and Japanese filings.
Espacenet’s advanced search interface supports structured queries by inventor, applicant, title, abstract, claims, description, publication date, IPC classification, and CPC (Cooperative Patent Classification) code. The CPC is a highly detailed classification system jointly developed by the EPO and the USPTO, providing more granular technology classification than the IPC alone.
For technology fields where significant prior art exists in European jurisdictions — mechanical engineering, chemical processes, medical devices, electronics — Espacenet is the preferred secondary search database after WIPO PATENTSCOPE.
Google Patents
URL: patents.google.com
Google Patents aggregates patent data from over 100 patent offices, including the USPTO, EPO, and IPO, and provides full-text searching with Google’s natural language processing capabilities. Unlike traditional patent databases, Google Patents allows free-text queries without requiring the searcher to know IPC codes or use Boolean operators — making it an effective starting point for searchers who are new to patent searching.
Google Patents also displays the prior art citations made by Examiners in examination reports, shows which patents cite a particular document as prior art, and provides a visual patent landscape tool. For rapid initial screening before a more structured search, Google Patents is highly effective.
Limitation: Google Patents’ coverage of Indian patents — particularly older filings — can be incomplete. Always verify Indian prior art findings directly in InPASS.
J-PlatPat — Japan Patent Office
URL: https://www.j-platpat.inpit.go.jp/?uri=/s0000/en
For technology fields where significant innovation originates from Japan — electronics, automotive engineering, robotics, materials science, precision manufacturing — J-PlatPat provides direct access to Japanese patents with English translation support. Many Japanese patent applications that constitute relevant prior art for Indian filings appear in WIPO PATENTSCOPE but are searched more effectively using J-PlatPat’s native interface.
How to Construct an Effective Patent Search Query
What search approach produces the most reliable results?
Effective patent searching requires two complementary approaches used together: keyword-based searching and classification-based searching. Relying on only one approach will produce incomplete results.
The Keyword Approach
Begin with the technical terminology that describes the invention — both the specific technical terms used in the relevant field and the broader functional descriptions that might be used in older or non-specialist filings. For an invention involving a polymer coating process, search terms might include: “polymer coating,” “surface treatment,” “coating process,” “protective layer,” “corrosion resistance,” and the specific polymer types involved.
Boolean operators in patent searching:
- AND — narrows the search: “polymer coating AND industrial components” retrieves documents containing both terms
- OR — broadens the search: “polymer coating OR surface treatment” retrieves documents containing either term
- NOT — excludes terms: “coating AND NOT paint” excludes paint-related documents
- Proximity operators — some databases support proximity searching: “polymer NEAR/3 coating” retrieves documents where “polymer” and “coating” appear within three words of each other, capturing phrases like “polymer-based protective coating”
Truncation: Most databases support wildcard truncation — “coat*” retrieves “coat,” “coating,” “coatings,” “coated,” and “coater” simultaneously. This is particularly useful where the same concept may be expressed in different grammatical forms.
The IPC Classification Approach
The International Patent Classification (IPC) is a hierarchical system that classifies all patented inventions by technical field. Every patent is assigned one or more IPC codes at filing. Searching by IPC code retrieves all patents in a specific technical field — regardless of the terminology used in their titles or abstracts.
IPC code structure example:
- B — Performing Operations; Transporting
- B05 — Spraying or Atomising in General
- B05D — Processes for Applying Liquids or Other Fluent Materials to Surfaces
- B05D 1/00 — Processes for Applying Liquids or Other Fluent Materials to Surfaces in General
- B05D — Processes for Applying Liquids or Other Fluent Materials to Surfaces
- B05 — Spraying or Atomising in General
Identifying the correct IPC codes for your technology field before searching significantly improves the recall and precision of the search. WIPO’s IPC classification tool at ipc.wipo.int allows you to browse the IPC hierarchy and find the codes most relevant to your invention.
Best practice: Run both a keyword search and an IPC classification search and compare the results. References that appear in both searches are the most likely to be significant prior art. References that appear only in the classification search but not the keyword search often represent older filings that use different terminology — and are frequently the prior art that examination-stage searches miss.
How to Read a Patent for Prior Art Purposes
When you find a potentially relevant patent, what do you look for?
A patent document contains multiple sections that serve different purposes. For prior art analysis, knowing which sections to read — and in what order — saves significant time.
Step 1 — Read the abstract. The abstract provides a one-paragraph summary of the invention. If the abstract describes something clearly different from your invention, the document is likely not significant prior art. If the abstract sounds similar, proceed to the claims.
Step 2 — Read the independent claims. The claims define the legal scope of the patent — what is actually protected. In any patent, look for the independent claims (typically Claim 1, and any other claims that do not reference earlier claims). An independent claim sets out the essential elements of the invention. For the patent to anticipate your invention, your invention must include every element stated in at least one independent claim of the prior art patent.
Step 3 — Read the specification if the claims are relevant. The specification (description) provides the full technical disclosure of the invention. Even if a claim does not directly cover your invention, the specification may describe your invention as a variation, an embodiment, or an example — which would still constitute prior art disclosure even if the claim scope is narrower.
Step 4 — Check the priority date. A prior art document can only affect the novelty of your application if it was published or publicly accessible before your application’s priority date. Check the publication date, the filing date, and any priority claims in the prior art document. A document published after your priority date is not prior art.
The Novelty Doctrine Under the Patents Act, 1970
What counts as prior art for an Indian patent application?
Novelty is not explicitly defined in the Patents Act, 1970 as a standalone provision — it is established through the anticipation and prior art framework across multiple sections, including the examination provisions, opposition grounds, and revocation grounds. For a patent application to be novel, the invention must not be anticipated by any of the following prior art categories:
1. Prior patents relating to the invention — patent applications and granted patents in India whose priority date precedes that of the current application. Note: an Indian patent application that has been filed but not yet published does not constitute prior art until it is published (typically eighteen months after the priority date).
2. Prior publications — any document published anywhere in the world before the priority date of the current application that discloses the invention. This includes scientific papers, technical reports, conference proceedings, product manuals, and any other publicly accessible document.
3. Prior commercial working — commercial use of the product or process in India before the priority date of the current application.
4. Prior government communication — communication of the product or process to the Government of India before the priority date.
5. Prior exhibition display — display of the product at an exhibition before the priority date. Exception: display at a Government-recognised international exhibition does not negate novelty, provided the application is filed within twelve months of the exhibition.
6. Prior public working — public use of the invention in India before the priority date. Exception: a prior public working that amounts to a “reasonable trial” attracts a twelve-month grace period.
7. Prior use — any use of the invention in India before the priority date of the current application.
The wrongful obtainment exception: A prior publication or prior patent filing does not negate novelty if the publication or filing was made without the consent of the inventor — that is, based on wrongful obtainment from the inventor or in contravention of their rights. This is an important protection for inventors whose unpublished work has been misappropriated.
The single-reference rule for novelty
For a prior art reference to negate the novelty of an invention, it must anticipate all elements of the invention. A single prior art reference must possess all elements of the claimed invention — either expressly stated or inherent in the disclosure. If even one element of the claimed invention is absent from the prior art reference, novelty is not negated by that reference. Prior art references are not combined or “mosaicked” for novelty analysis — each reference is assessed individually.
This is the critical distinction between novelty and inventive step.
Novelty vs Inventive Step: Why the Distinction Matters for Search Strategy
How does the inventive step assessment differ from the novelty assessment?
Novelty and inventive step are related but distinct patentability requirements. Understanding the difference is essential for interpreting search results and framing a response to examination objections.
Novelty is assessed against a single prior art reference at a time. If no single reference discloses all elements of the claimed invention, the invention is novel.
Inventive step (non-obviousness) is assessed against the common general knowledge of a person skilled in the relevant art — and may involve combining multiple prior art references. Under Section 2(1)(ja) of the Patents Act, an invention involves an inventive step if it has a “feature that involves technical advance as compared to the existing knowledge or having economic significance or both and that makes the invention not obvious to a person skilled in the art.”
The practical consequence: an invention may be novel (no single reference discloses all its elements) but still lack inventive step if a person skilled in the art would have found it obvious to combine two or more prior art references to arrive at the invention.
For search strategy purposes, a thorough prior art search must look not only for single references that anticipate the invention (novelty analysis) but also for combinations of references that a skilled person might combine to arrive at the invention (inventive step analysis). This is why a search that returns only partial matches should not be dismissed — those partial matches may be combined in an inventive step analysis during examination.
Interpreting Search Results: What to Do After the Search
Your search is complete. What do the results tell you, and what should you do next?
Result: No significant prior art found. The invention is likely novel and may involve an inventive step. Proceed with filing. Use the clean search result to support broad claim drafting — if no prior art comes close, the claims can be drafted with greater scope. Keep the search records: they may be relevant in prosecution if the Examiner raises objections.
Result: A closely related prior art reference found. Assess whether the prior art reference anticipates all elements of the proposed invention or only some. If all elements are present in one reference, the invention as conceived is not novel. Options: modify the invention to create a genuinely distinct variation; reframe the claims to claim only the features that are absent from the prior art; or commission a more detailed freedom-to-operate analysis before deciding whether to abandon the application.
Result: Multiple partial matches found. The invention is novel (no single reference discloses all elements). Assess whether a skilled person would find it obvious to combine the references. If the combination seems non-obvious, proceed with filing — but prepare arguments explaining why the combination would not have been apparent to a skilled person, because the Examiner is likely to raise inventive step objections during examination.
Result: A live Indian patent was found that covers similar subject matter. Before filing, commission an FTO analysis to assess whether commercialising the invention would infringe the patent. An FTO analysis is distinct from a novelty search — it answers whether you can safely commercialise, not whether you can get a patent. Both questions need to be answered for a complete picture.
When to Conduct the Search Yourself vs Engage a Patent Agent
Is DIY patent searching adequate, or should a professional conduct the search?
For an initial screening — to determine whether obviously close prior art exists before investing in a full specification — a self-conducted search using Google Patents or WIPO PATENTSCOPE is a reasonable starting point. Most obviously blocking prior art can be identified through a careful keyword search in one or two hours.
For a filing decision, however, a professionally conducted search is strongly recommended. Patent agents experienced in prior art searching use IPC and CPC classification codes systematically, know how to search in non-English language databases, understand how to identify relevant prior art that a keyword search might miss (through synonym variation, older terminology, and non-patent literature searches), and can provide a written search opinion that is defensible if the search results are later challenged.
The cost of a professional prior art search — typically ₹15,000 to ₹50,000 depending on the technology field and scope — is a fraction of the prosecution cost of an application that fails at examination due to prior art that a thorough search would have identified.
Conclusion: Search First, File Second
Patent applications fail at examination for two primary reasons: the invention is not novel, or the invention lacks an inventive step over the prior art. Both failures are, to a significant extent, preventable through a thorough prior art search conducted before the application is filed.
The databases are freely accessible. InPASS, WIPO PATENTSCOPE, Espacenet, and Google Patents provide comprehensive global patent coverage without cost. The search methodology — IPC classification combined with keyword searching, reading claims before specifications, checking priority dates is learnable. And the cost of getting it wrong — examination refusal, abandoned applications, wasted filing fees — is far greater than the cost of getting it right.
At Unimarks Legal Solutions, our patent practice conducts prior art searches, patentability assessments, freedom-to-operate analyses, and invalidity searches for inventors, startups, MSMEs, and established companies preparing to file or prosecute patent applications in India. A search conducted before filing is the most cost-effective IP investment you can make.
Commission a prior art search before your next filing → Patent Registration Services — Unimarks Legal Solutions
Also see: Types of Patent Applications in India — Which One Should You File? → [INTERNAL LINK: /what-are-the-different-types-of-patents/] Also see: How Indian Startups Get Patents Faster and Cheaper → [INTERNAL LINK: /how-to-get-a-patent-in-india/] Also see: Building a Patent Portfolio Strategy in India → [INTERNAL LINK: /patent-portfolio-strategy-india/]
About the Author
Advocate Suresh Kumar has a law practice specialising in Intellectual Property Rights, Commercial legal advisory, debt recovery, commercial litigation, and dispute resolution for domestic and international clients. He is enrolled with the Bar Council of Tamil Nadu and Puducherry and represents clients before all courts and forums in Chennai, Tamil Nadu. This article reflects his understanding of the current legal position and is intended solely for informational purposes.
Disclaimer
This article is published by Unimarks Legal for informational purposes only. It is not intended to constitute legal advice or to create an attorney-client relationship. The contents are based on Indian law as applicable at the time of writing and are subject to change. Readers should not act upon the information in this article without seeking independent legal counsel. Every legal situation is unique, and the application of law depends on specific facts and circumstances. Past results do not guarantee future outcomes. This publication is made in compliance with the Bar Council of India Rules, which prohibit advertising or solicitation by advocates. Any information received through this article should not be construed as legal advice.
For specific legal guidance on your matter, you may consult a qualified advocate in your jurisdiction.
