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Who can oppose a patent?

31-Dec-2025
Patent

Answer By law4u team

Who Can Oppose a Patent in India? In India, the patent opposition process is an important part of the patenting system, as it ensures that patents are granted only for inventions that meet the criteria for patentability. The opposition mechanism provides a way for third parties to challenge the validity of a patent before or after it is granted, ensuring that the patenting process is fair, transparent, and in line with legal requirements. The Indian Patents Act, 1970 (amended several times, with significant updates in 2005) provides clear provisions regarding who can oppose a patent and the processes involved. There are two main stages for patent opposition in India: pre-grant opposition and post-grant opposition. Each of these stages allows different types of parties to file an opposition based on specific grounds. 1. Pre-Grant Opposition (Opposition Before Patent Grant) A pre-grant opposition occurs before a patent is granted to an applicant. During this phase, any person can file an opposition to the grant of the patent. The opposition is typically based on grounds that the invention does not fulfill the patentability criteria set out in the Patents Act. Who Can File a Pre-Grant Opposition? Any person: Unlike post-grant opposition, which is restricted to interested parties, pre-grant opposition can be filed by any person who believes that a patent should not be granted to an applicant. This means that even people who do not have a direct commercial or legal interest in the patent can file an opposition. This includes: Competitors in the same industry who might be impacted by the grant of a patent. General members of the public who believe that the invention is not patentable. Organizations, NGOs, or advocacy groups concerned with specific industries (such as public health, the environment, or intellectual property rights). Grounds for Pre-Grant Opposition: The grounds on which a pre-grant opposition can be made are as follows: 1. Lack of Novelty: The invention is not new and is already disclosed in prior art (existing knowledge, patents, publications). 2. Obviousness: The invention is obvious to someone skilled in the field, based on prior knowledge or existing patents. 3. Non-patentable subject matter: The invention does not fall within the subject matter that is eligible for a patent under Indian law. For example, scientific theories, mathematical methods, or abstract ideas are not patentable. 4. Insufficient Disclosure: The patent application does not adequately describe the invention or its method of making or using it. 5. Prior Public Knowledge: The invention has been publicly known, used, or disclosed before the filing of the patent application. 6. Failure to Disclose Information: The applicant failed to disclose information about prior patents or knowledge that could affect the patent's validity. 2. Post-Grant Opposition (Opposition After Patent Grant) After a patent is granted, any person can file a post-grant opposition to challenge the validity of the patent. This opposition occurs within 12 months from the date of patent grant. It is more limited than pre-grant opposition since only interested parties (those with a direct legal or commercial interest in the matter) can file such an opposition. Who Can File a Post-Grant Opposition? Any person: Just like the pre-grant opposition, any person can file a post-grant opposition to a granted patent. However, the key difference is that in the case of a post-grant opposition, the person filing the opposition must have a legitimate interest in the matter. This includes individuals or organizations that can demonstrate that they would be directly affected by the patent being granted, such as: Competitors: Companies or individuals who operate in the same technological area and may be affected by the monopoly granted by the patent. Consumers: In some cases, consumer groups or organizations that advocate for public health, the environment, or fair market practices can file a post-grant opposition if they believe the patent will have a harmful effect on society. Research and Development Organizations: Institutions or researchers in the same field may file opposition if they believe the invention is not truly novel or was derived from their own research. Non-Governmental Organizations (NGOs): In cases where a patent is granted for an invention with potential negative implications for public health, safety, or the environment, relevant NGOs may file an opposition. Grounds for Post-Grant Opposition: The grounds for post-grant opposition are similar to those for pre-grant opposition but may focus on issues that become clear only after the patent is granted. The grounds include: 1. Lack of Novelty: If the invention is not novel or has been disclosed in prior art (publications, patents, or known to the public before the patent was filed). 2. Obviousness: If the invention would have been obvious to a person skilled in the relevant field based on prior art. 3. Insufficient Disclosure: If the patent does not provide enough information to enable a person skilled in the art to reproduce the invention. 4. Non-patentable Subject Matter: If the invention does not meet the criteria for patentability, such as inventions that are not useful or involve prohibited subject matter. 5. Prior Use or Knowledge: If the invention has already been publicly used, known, or disclosed before the filing date of the patent. 6. Failure to Disclose Information: If the applicant fails to disclose prior art or other information that would affect the patent's validity. 3. Opposing Parties in Patents: Categories of Stakeholders Besides the general right of any person to file a pre-grant or post-grant opposition, several categories of stakeholders are commonly involved in patent opposition proceedings in India: a. Competitors Competitors in the same industry or technological field may have a strong interest in challenging a patent that could limit their ability to use the same or similar technologies. They may oppose the patent because they believe it is not novel or has already been disclosed in prior art. b. Innovators or Research Institutions Researchers, universities, and R&D institutions can file oppositions if they believe the patent should not have been granted due to lack of novelty or because the invention was based on their own prior work or public knowledge. c. Industry Associations and Trade Groups Certain industry associations or trade groups that represent businesses in the field of the disputed patent may file an opposition, especially if the patent could restrict competition or affect industry practices. d. NGOs or Public Interest Groups Non-governmental organizations or public interest groups may file an opposition if they believe that the patent poses a threat to public health, safety, the environment, or access to essential goods. For example, if a patent relates to a life-saving drug or a fundamental technology that could negatively impact public welfare, an NGO might oppose it. e. Investors or Stakeholders in Related Fields Investors or stakeholders whose interests are tied to a particular technology or sector may oppose a patent if they feel that the granted patent would block or impede innovation and future market growth in that sector. 4. The Process of Filing an Opposition Pre-grant opposition: A pre-grant opposition must be filed before the patent is granted. The applicant is given a chance to respond to the opposition, and the matter is adjudicated by the patent office. The opposition can be based on any of the statutory grounds listed above. Post-grant opposition: After the grant of a patent, any interested person can file a post-grant opposition within 12 months of the grant. Similar to pre-grant opposition, the applicant can respond to the opposition, and the patent office will decide whether the patent should be revoked or upheld. 5. Consequences of Opposition If an opposition is successful, the patent application can be rejected, or the granted patent can be revoked or amended. If the opposition fails, the patent remains valid, and the patentee retains the exclusive rights to the invention. Settlement: In some cases, the parties involved in the opposition may agree to settle the matter out of court, leading to an amendment of the patent claims or other compromise solutions. Conclusion In India, both pre-grant and post-grant opposition procedures allow any person to challenge a patent’s validity, though the person must have a legitimate interest in the case for a post-grant opposition. The grounds for opposition generally revolve around issues like lack of novelty, obviousness, insufficient disclosure, and non-patentable subject matter. Competitors, research institutions, NGOs, and interested parties in the field often file such oppositions. By providing this mechanism, the Indian Patents Act aims to prevent unjust patents and ensure that only truly innovative and novel inventions are granted exclusive rights.

Answer By Ayantika Mondal

Dear client, Under the Patents Act, 1970, the right to oppose a patent depends upon the stage of the patent and is provided under Sections 25(1) and 25(2). Section 25(1) – Pre-grant opposition Any person may file a pre-grant opposition against a patent application at any time after publication of the application but before the grant of the patent. There is no requirement of locus standi, and even a third party or interested member of the public may oppose the grant. Section 25(2) – Post-grant opposition Any “person interested” may file a post-grant opposition within one year from the date of publication of grant of the patent. A “person interested” generally includes a person engaged in, or promoting, research or business in the same field as the invention. Therefore in simple words, before grant, any person can oppose a patent under Section 25(1) and After grant, only a person interested can oppose the patent under Section 25(2). I hope this answer was helpful. For further queries, please do not hesitate to contact us. Thank you.

Answer By Anik

Dear client, As per your query, a patent is a government-granted exclusive right for an invention (a product or process) that stops others from making, using, or selling it for a limited time in exchange for the inventor publicly sharing the technical details, which promotes innovation and societal knowledge. It's a form of intellectual property protecting new, useful, and non-obvious inventions like new devices, methods, or chemical compositions. An opposition proceeding is an administrative procedure under the jurisdiction of patent law which allows third party to formally challange validity of pending patent applications and challenge the already granted patent applications. Indian patent opposition system profer two kinds of patent opposition process at two different stages of patent prosecution. They are: Pre-Grant Opposition Post-Grant Opposition Section 25 of the Patents Act, provides for Opposition to the patent and sets out as to how can people challenge a patent. Section 25(1) for pre-grant opposition and Section 25(2) for post-grant opposition. Anyone can oppose a patent application before it's granted (pre-grant opposition), including competitors, researchers, and public interest groups, but only an "interested person" (like the patent holder or someone affected) can oppose it after grant (post-grant opposition). To conclude, Patent opposition mechanisms, especially pre-grant, are designed to involve the public and third parties to maintain high standards for granted patents, with broad participation allowed before grant and narrower participation after. I hope this answer was helpful. For further queries, please do not hesitate to contact us. Thank you.

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