Prior Art Search Services in India – Patentability, FTO, Validity, and Landscape | Unimarks Legal Solutions
Filing a patent application without a prior art search is like building on land you have not surveyed. You might own it. You might not. You will only find out when it becomes expensive to fix.
A prior art search identifies what already exists in the patent and non-patent literature before you file, so you know whether your invention is novel, whether your claims will survive examination, and whether your product or process infringes any existing rights. Conducted before filing, a prior art search saves time and professional fees. Conducted before a product launch, it prevents injunctions. Conducted before litigation, it builds or destroys a case.
At Unimarks Legal Solutions, we conduct prior art searches across Indian and international patent databases, academic literature, technical publications, and commercial disclosures. Every search is accompanied by a written opinion that maps the search findings against the legal standards applicable to the specific purpose of the search patentability, freedom-to-operate, validity, or landscape.
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Which Type of Prior Art Search Do You Need?
| Your Situation | Search Type | What It Tells You |
|---|---|---|
| You have an invention and want to know if it can be patented | Patentability / Novelty Search | Whether the invention is novel and involves an inventive step under the Patents Act, 1970 |
| You have a product you want to launch checking for blocking patents | Freedom-to-Operate (FTO) Search | Whether making, selling, or importing the product infringes any existing enforceable patent |
| You want to challenge a competitor’s granted patent | Validity / Invalidity Search | Whether prior art exists that would invalidate the patent’s novelty or inventive step |
| You need to understand the full patent landscape in a technology area | Landscape / State-of-Art Search | Who holds patents in the space, what is protected, and where white spaces exist |
| You are accused of infringing a patent | Infringement / Clearance Search | Whether your specific process or product falls within the claims of the asserted patent |
| You are conducting IP due diligence before M&A or investment | Portfolio Search | Strength, coverage, and vulnerability of a patent portfolio under review |
The legal standard every search is measured against: Under Section 2(1)(j) of the Patents Act, 1970, an invention is patentable only if it is novel and involves an inventive step. Section 2(1)(ja) defines inventive step as a technical advance over prior art that would not be obvious to a person skilled in the art. A prior art search maps your invention against this legal standard not just as a database exercise, but as a legal assessment of where the invention sits relative to what Indian and international examiners will cite.
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The Legal Framework – What “Prior Art” Means Under Indian Patent Law
Novelty under Section 2(1)(l)
The Patents Act, 1970 defines a “new invention” in Section 2(1)(l) as any invention or technology which has not been anticipated by publication in any document or used in the country or elsewhere in the world before the date of filing of the patent application with complete specification. This definition is critical prior art under Indian law is global, not limited to Indian disclosures. A scientific paper published in a German journal in 1995 is prior art against an Indian patent application filed today. A product sold commercially in Japan without any patent filing is prior art. A doctoral thesis submitted to a university library is prior art.
Inventive step under Section 2(1)(ja)
Section 2(1)(ja) defines inventive step as a feature of an invention that involves a 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. An invention can be novel meaning no single document discloses it exactly but still lack an inventive step if the combination of existing documents would make it obvious to a skilled practitioner. Prior art searches must therefore look not just for exact matches (novelty anticipation) but for combinations of documents that together render the invention obvious (inventive step anticipation).
What counts as prior art
Prior art under Indian and international patent law includes:
Patent documents: Granted patents, published patent applications, utility models, and PCT applications from any country. The filing date determines priority a patent application published after your filing date is not prior art against your application if you filed first.
Non-patent literature (NPL): Academic journal articles, conference papers, doctoral theses, technical standards, product manuals, technical brochures, regulatory submissions, and any other document publicly available before your filing date.
Prior use and sale: Commercial sales, public demonstrations, trade fair exhibitions, and any other public disclosure of the invention before the filing date even without any written documentation.
Internet disclosures: Website content, forum posts, and any publicly accessible digital content with a verifiable publication date before your filing date.
Key Takeaway: A comprehensive prior art search must cover patent databases, non-patent literature, and commercial disclosure sources not patents alone. Missing non-patent literature is the most common prior art search gap and the most commonly cited basis for examination objections.
Our Search Methodology – Five Databases, Systematic Coverage
The databases we search
1. InPASS: Indian Patent Advanced Search System (iprsearch.ipindia.gov.in) The Indian Patent Office’s own searchable database of all Indian patent applications and grants. InPASS allows keyword, applicant, inventor, classification code, and date-range searches. Essential for Indian patent landscape analysis and for identifying existing Indian rights in the FTO context. Coverage is strongest for applications filed after 2000, with older records available but less comprehensively indexed.
2. WIPO PATENTSCOPE (patentscope.wipo.int) Covers PCT international applications and a growing collection of national patent office databases. Essential for identifying international filings that designate India in national phase. The search interface supports multiple languages, structural chemical searches, and sequence searches for biotechnology inventions. Cross-lingual expansion search identifies documents in other languages that may be semantically relevant even when keyword terms differ.
3. Espacenet (European Patent Office: epo.org/en/searching-for-patents) Covers 150+ million patent documents from 100+ countries. The EP full-text database, the worldwide (WW) database, and the Inpadoc family database allow claim-level searching, family member identification, and legal status tracking. Espacenet’s CPC (Cooperative Patent Classification) tagging is the most granular classification system available and enables highly focused subject-matter searches.
4. Google Patents (patents.google.com) Provides the most accessible interface for broad keyword searching across a large corpus of global patent documents. Prior art date filtering, citation analysis, and semantic search capabilities make it particularly useful for initial scope-setting and for identifying non-obvious combinations across technology domains. Google Patents’ English machine translations of non-English documents provide useful access to Japanese, Chinese, Korean, and German prior art.
5. J-PlatPat: Japan Platform for Patent Information (j-platpat.inpit.go.jp) Japan’s national patent database covering Japanese Unexamined Patent Applications (Kokai), registered patents, and utility models. Particularly important for mechanical engineering, automotive, electronics, and materials science inventions where Japanese prior art is dense. English abstracts are available for the majority of Japanese patent documents from 1993 onwards.
Additional sources depending on search type
For NPL searches: IEEE Xplore (engineering and electronics), PubMed (life sciences and pharmaceuticals), ACM Digital Library (computer science), Google Scholar, and domain-specific academic databases.
For FTO searches: Inpadoc legal status database (tracking whether cited patents are in force, lapsed, or abandoned in the jurisdiction of interest), national register searches for Indian patents in force, and regulatory filing databases for pharmaceutical product patents.
For validity searches: Expanded NPL search, prior use evidence (commercial databases, product archives, trade publication archives), and prosecution history of the patent under challenge.
Our Search Services – What We Deliver
Patentability / Novelty Search and Opinion
Who needs this: Any inventor, R&D team, or startup before filing a patent application. The most important search in the patent lifecycle conducted before drafting, it shapes the entire application strategy.
What we do: We receive a technical disclosure of the invention, identify the key technical features that constitute the inventive contribution, construct a structured search strategy using keyword combinations and IPC/CPC classification codes, and conduct systematic searches across InPASS, WIPO PATENTSCOPE, Espacenet, Google Patents, and relevant NPL sources.
What we deliver:
- A written patentability opinion assessing novelty and inventive step under Sections 2(1)(j) and 2(1)(ja) of the Patents Act, 1970
- A categorised table of search results each prior art document assessed for relevance to your invention’s claims
- A clear recommendation on whether to proceed to filing, modify the invention to strengthen patentability, or reconsider based on close prior art
- Suggested claim scope adjustments where prior art has been identified that would narrow but not defeat patentability
Typical turnaround: 5–10 working days from receipt of technical disclosure.
Freedom-to-Operate (FTO) Search and Opinion
Who needs this: Companies and entrepreneurs before launching a product or process that incorporates a novel technology. Also required before licensing negotiations and before M&A transactions where the target’s product portfolio is being acquired.
What we do: We analyse the technical features of the product or process under review, identify the relevant technology fields and patent owners active in those fields, search for patents in force in the jurisdiction(s) of interest, and conduct a claim-by-claim mapping of identified patents against the product’s technical features.
What we deliver:
- A written FTO opinion identifying patents that pose a risk of infringement
- Claim mapping tables showing element-by-element comparison of the product’s features against identified patent claims
- Legal status confirmation for all identified patents (whether in force, lapsed, or abandoned) via Inpadoc
- Risk rating for each identified patent (high / medium / low) based on claim scope and likelihood of coverage
- Design-around recommendations where specific claims present infringement risk
Important limitation: An FTO opinion cannot provide absolute clearance it is a risk assessment based on publicly available information and the searches conducted. It does not account for pending unpublished applications (which remain secret for 18 months from filing), divisional applications that may not yet be filed, and continuation practices in some jurisdictions.
Typical turnaround: 10–15 working days from receipt of product technical specification.
Validity / Invalidity Search
Who needs this: Defendants in patent infringement proceedings, companies facing cease-and-desist notices based on competitor patents, and parties filing post-grant opposition proceedings under Section 25(2) of the Patents Act, 1970.
What we do: We conduct an exhaustive search specifically designed to identify prior art that anticipates or renders obvious the claims of the patent under challenge. The search is structured around the specific claims of the patent understanding what the patent claims to protect and systematically searching for disclosures predating the patent’s priority date that match those claim elements.
What we deliver:
- A validity opinion assessing each independent claim of the patent against identified prior art
- Anticipation analysis: identification of single prior art documents that disclose every element of a claim (anticipation = novelty destruction)
- Obviousness analysis: identification of combinations of prior art documents that would have rendered the invention obvious to a skilled practitioner at the priority date
- A recommendation on the strength of the invalidity position and the appropriate forum (NCLT for post-grant opposition under Section 25(2), or High Court for revocation under Section 64)
Typical turnaround: 15–20 working days depending on claim complexity and technology field.
Patent Landscape / State-of-Art Search
Who needs this: R&D teams planning a new technology development program, companies entering a new technology market, investors conducting IP due diligence, and organisations benchmarking their patent portfolio against competitors.
What we do: We map the entire patent landscape in a defined technology area identifying all major patent holders, the geographic scope of existing rights, the temporal concentration of filing activity, the most active inventors, technology clusters and white spaces, and the expiry timeline of key blocking patents.
What we deliver:
- A landscape report with visualisations: filing trend charts (activity over time), assignee analysis (who holds the most patents), geographic coverage maps, technology cluster diagrams, and key patent expiry timeline
- Identification of white spaces technology areas within the field where no existing patents cover specific approaches
- Strategic recommendations: where to file new applications to maximise portfolio value, which blocking patents need design-around consideration, and which approaching patent expiries create freedom
Typical turnaround: 15–25 working days depending on technology field scope.
The IPC / CPC Classification System – Why Classification Matters
One of the most reliable prior art search methods is classification-based searching using the International Patent Classification (IPC) system maintained by WIPO, or the more granular Cooperative Patent Classification (CPC) jointly developed by the EPO and USPTO.
The IPC and CPC assign every patent document to one or more classification codes based on the technical subject matter of the invention. A well-classified search identifies all documents assigned to the relevant classification codes regardless of what keywords were used to describe the invention in the original patent text. This is critical because the same invention can be described using entirely different terminology in patents filed in different countries and different decades.
For example, an invention relating to a specific type of heat exchanger might be described as a “heat exchange apparatus,” a “thermal transfer device,” a “caloric transmission system,” or a dozen other formulations across the prior art corpus. A keyword-only search misses documents that use different terminology. A classification-based search anchored to IPC/CPC codes F28D or F28F captures all of them regardless of terminology.
Every prior art search we conduct includes a classification-mapping step: identifying the IPC and CPC codes most relevant to the invention before any keyword searching begins.
Credentials
| Credential | Detail |
|---|---|
| Patents filed and prosecuted | 200+ across mechanical, electronics, pharma, software-adjacent, and industrial domains |
| Prior art searches conducted | Patentability, FTO, validity, and landscape across all technology fields |
| Database access | InPASS, WIPO PATENTSCOPE, Espacenet, Google Patents, J-PlatPat, IEEE Xplore, PubMed |
| IPC/CPC classification expertise | Structured classification-based search methodology for all technology fields |
| Opinion writers | Patent practitioners with litigation and prosecution background opinions shaped by examination and opposition experience |
| Offices | Chennai · Cochin · Hyderabad |
Why prior art opinions from a litigation-experienced team matter: A prior art search conducted purely as a database exercise produces a list of documents. A prior art search conducted by practitioners who also draft patent claims, respond to FERs, and appear in opposition proceedings produces a legal opinion one that maps the findings against the actual standard applied by the Indian Patent Office and the courts.
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Frequently Asked Questions
Prior art is any disclosure of an invention that was available to the public before the filing date of the patent application anywhere in the world. Under Section 2(1)(l) of the Patents Act, 1970, an invention must not have been anticipated by any prior publication, prior use, or prior commercial availability before the filing date. Prior art includes granted patents and published applications from any country, academic papers and conference proceedings, doctoral theses, technical standards, product manuals, commercial sales, public demonstrations, and internet disclosures with a verifiable pre-filing publication date.
A prior art search is not legally mandatory before filing. You can file a patent application without conducting any search. However, a pre-filing patentability search is one of the most important investments in the patent filing process it determines whether the application is likely to succeed, shapes the claim drafting strategy, and can save substantial professional fees by identifying close prior art before drafting begins rather than after the First Examination Report is received.
A focused patentability search for a moderately complex invention typically takes 5–10 working days from receipt of the technical disclosure. A freedom-to-operate search takes 10–15 working days depending on the number of technology fields to be cleared and the complexity of the product. Validity searches and landscape searches take 15–25 working days depending on the scope of the claim set or technology area.
A novelty (patentability) search asks: “Has my invention been disclosed before?” It searches for prior art that would prevent your patent from being granted focusing on whether the invention is novel and non-obvious. A freedom-to-operate (FTO) search asks: “Will making or selling this product infringe any existing patent?” It maps the features of a specific product or process against the claims of existing in-force patents in the jurisdictions where you want to operate. The two searches have different purposes, different search strategies, and often produce different results an invention can be novel enough to patent while still infringing an existing broader patent.
No prior art search or FTO opinion can provide absolute clearance from infringement. The primary limitation is unpublished patent applications: patent applications remain confidential for 18 months from their priority date under the PCT system. A product launched today may face infringement claims from an application that was filed 12 months ago and will not be published for another 6 months. FTO opinions identify and assess known, published risks and they are a structured risk management exercise, not a guarantee. A well-conducted FTO opinion significantly reduces infringement risk and provides a documented record of good-faith due diligence.
An India-focused search prioritises InPASS (Indian Patent Office database), Espacenet with India as a designated country, and WIPO PATENTSCOPE for PCT applications entering India. An international search adds J-PlatPat (Japan), China’s CNIPA database, the USPTO database, and the DEPATISnet (Germany) for more comprehensive coverage. For FTO purposes, legal status verification through Inpadoc is added to confirm which of the identified patents are currently in force in the jurisdictions of interest. Non-patent literature searches add IEEE Xplore, PubMed, Google Scholar, and domain-specific academic databases as appropriate to the technology field.
The International Patent Classification (IPC) is a hierarchical classification system maintained by WIPO that assigns every patent document to one or more codes based on technical subject matter. There are 8 main sections (A through H) for example, Section A (human necessities), Section C (chemistry and metallurgy), Section H (electricity). Each section is subdivided through classes, subclasses, groups, and subgroups to several thousand classification codes. A search that identifies the correct IPC codes for an invention finds all prior art documents classified to those codes regardless of what keywords were used in the original document. Classification-based searching is significantly more reliable than keyword-only searching, particularly across multilingual prior art.
A patent landscape search is most valuable at three decision points: before launching a new R&D programme (to understand what already exists and where to focus innovation effort), before entering a new technology market (to identify dominant patent holders and potential licensing obligations), and before significant IP-related investments such as M&A, licensing negotiations, or portfolio acquisition (to assess the strength and coverage of the patents under consideration). Landscape searches typically cover 5–15 year windows of patent activity in a defined technology area and deliver strategic intelligence about the competitive IP environment.
Section 64 of the Patents Act, 1970 provides the grounds on which a granted patent may be revoked, including prior publication, prior claiming, obviousness, and insufficiency of description. A validity search specifically for Section 64 proceedings searches for prior art disclosures (published documents, prior uses, or prior sales) that predate the patent’s priority date and anticipate or render obvious the specific claims of the patent under challenge. Such searches must be exhaustive courts expect the invalidity evidence presented to cover the full range of relevant prior art, not a selective sample. We conduct validity searches specifically structured around the claims to be challenged and the grounds to be pleaded.
The First Examination Report issued by the Indian Patent Office typically cites specific prior art documents against the novelty and inventive step of the application’s claims. A pre-filing patentability search that identified similar prior art allows the applicant to have already anticipated these objections and drafted the claims with appropriate scope to distinguish them. Where the examiner cites documents not identified in the prior art search, we conduct targeted supplementary searches to assess the cited documents and formulate effective FER responses either by arguing why the cited document does not anticipate the claims, or by proposing claim amendments that maintain commercial value while overcoming the citation.
For software-implemented inventions, prior art includes all standard patent prior art plus a particularly important NPL (non-patent literature) layer: open-source code repositories (GitHub, SourceForge), conference proceedings (ACM, IEEE, USENIX), academic papers describing algorithms, published documentation of software libraries, and any public disclosure of code through product releases, app stores, or public demonstrations. Given that software-implemented inventions face the additional Section 3(k) patentability barrier in India (software per se is excluded), a prior art search for such inventions must also assess whether the claimed technical effect is sufficiently novel and non-obvious to survive both the Section 3(k) analysis and standard novelty/inventive step examination.
The process begins with a free consultation to understand the invention (for patentability searches) or the product/patent (for FTO, validity, or landscape searches). We then request a technical disclosure document a written description of the key technical features of the invention or product, with drawings where relevant. No formal patent application is needed at this stage. Based on the disclosure, we identify the search strategy, confirm the scope and fee, and upon engagement conduct the search within the agreed timeline. The output is a written opinion with a structured results table and a specific recommendation. All disclosures are handled under confidentiality.
Related Services
- Patent Registration in India – file your application after the search confirms patentability
- IP Litigation and Enforcement – enforce or defend patent rights with litigation-grade prior art analysis
- IP Audit – assess your full portfolio including search gaps on existing filed patents
- Types of Patent Applications Filed In India – detailed guide to patent search methodology
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 patent consultant/attorney in your jurisdiction.
