Pre-Grant and Post-Grant Patent Opposition in India

The patent system is designed to reward true innovation. However, applications are sometimes filed for ideas that are not actually new, are already being used by others, or belong to traditional knowledge. If a competitor successfully patents a common technology, they could unfairly block your business from manufacturing your own products or demand expensive royalty payments.

Fortunately, the Indian Patents Act, 1970, provides a legal mechanism to challenge and stop these invalid patents. Whether you need to block a rival from securing a monopoly or defend your own patent application from a competitor's attack, this legal battleground is known as Patent Opposition.

Common Grounds for Challenging a Patent

Under Section 25 of the Patents Act, you cannot just oppose a patent because you dislike the competitor. You must base your challenge on specific legal grounds. The most common reasons we file oppositions include:

• Lack of Novelty or Obviousness: The product is already known to the public, or the concept is too obvious (for example, trying to patent a pencil with an eraser attached).
• Prior Publication: The inventor publicly revealed the product details at an international conference or published a paper about it before filing their application.
• Wrongfully Obtained: Someone stole the research and filed the patent without the true inventor's consent.
• Not a Legal Invention: The application is for something the law forbids patenting, such as a mathematical formula or a machine that violates the laws of physics.
• Insufficient Description: The applicant deliberately hid the chemical composition or exact working mechanism, making it impossible for others to understand how it works.
• Traditional Knowledge: Wrongfully claiming an invention by hiding its geographical origin, such as attempting to patent a traditional Indian turmeric-based remedy.

Phase 1: Pre-Grant Opposition

Once the government officially publishes a patent application, it becomes publicly available. From that publication date until the day the patent is formally granted, the door is open for a pre-grant opposition.

• Who can file? The law states that "any person" can file a pre-grant opposition. You do not have to prove that you are a direct competitor to challenge it.
• The Process: Our patent attorney submits written evidence to the Controller of Patents proving the application is invalid. The Controller then notifies the applicant, who is given a strict three-month window to submit their counter-statements and evidence. This often forces the Patent Office to pause the approval and demand formal office action responses from the applicant.

Phase 2: Post-Grant Opposition

Sometimes, an invalid patent slips through the examination process and is officially granted. If this happens, you have a second chance to challenge it, but the rules are much stricter.

• The Strict Timeline: A post-grant opposition can only be filed within exactly one year from the date the grant was published in the official Patent Journal. Once that one-year window closes, this specific option is lost forever.
• Who can file? Unlike the pre-grant phase, you must legally prove you are a "person interested." It means you must show the government that you are actively engaged in the same business field and that this granted patent directly threatens your commercial interests.
• The Process: This phase involves submitting a formal letter, detailed relief requests, and extensive evidence to an Opposition Board. If the Controller finds merit in the challenge, it usually ends in a highly technical legal trial.

Protect Your Market Share

Whether you need to invalidate a competitor's unfair patent or defend your own invention from an aggressive challenge, strategic legal action is required.

At M&P IP Protectors in Ahmedabad, our IPR lawyers manage both sides of the opposition process to ensure your market share remains secure. If you have spotted a threatening patent application or if your own filings are under attack, please call +91 79480 05141 for a consultation.