What is the difference between pre-grant and post-grant opposition to a patent

Question

A competitor has filed a patent application that I believe is invalid, and I want to know how to oppose it in India. I would rather settle this without going to court if the law allows it, but I need to know my rights before I sign anything. Please tell me what to do first and what document to keep.

MyVakeel Legal Desk · Accepted Answer

Under Indian law, Patents Act, 1970, Section 25(1) is the starting point for this intellectual property question. What follows is the position in substance, together with the steps that usually make the difference in practice.

Section 25(1) of the Patents Act, 1970 allows any person to file a pre-grant opposition (also called a representation) at any time after publication of the application but before grant of the patent, on statutory grounds including lack of novelty, obviousness, insufficient disclosure, wrongful obtaining, and non-patentability under Section 3, without requiring the opponent to pay a fee or prove standing as a 'person interested'.

Section 25(2) allows only a 'person interested', typically a competitor or someone in the same trade, to file a post-grant opposition within twelve months from the date of publication of grant of the patent, on largely the same statutory grounds, and this is heard by an Opposition Board of three examiners who submit a recommendation to the Controller.

Pre-grant opposition is decided by the Controller directly after considering the representation and the applicant's response, without a mandatory Opposition Board, whereas post-grant opposition follows a more elaborate procedure involving pleadings, evidence and a hearing before the Controller, based on the Opposition Board's joint recommendation.

Beyond opposition, any person interested or the Central Government can also file a revocation petition before the High Court (post the abolition of the IPAB) under Section 64 at any time after grant, on grounds overlapping with those available in opposition, making the patent's validity challengeable throughout its twenty-year term.

What to do next: 1) Identify whether the application is still pending (pre-grant) or already granted (post-grant); 2) Gather prior art and technical evidence showing lack of novelty or inventive step; 3) File the representation or opposition within the applicable statutory window; 4) Engage a patent agent to draft technical arguments and evidence affidavits.

If you are unsure whether your facts fall inside Patents Act, 1970, Section 25(1), that is worth checking with an advocate before you commit to a route, because switching later costs time. You can post the details on the MyVakeel forum for a practising advocate to review, or book a paid consultation with a Bar Council verified lawyer in intellectual property.