A representation for pre-grant opposition can be filed within six months from the date of publication of the application u/s 11A or before the grant of patent. The grounds on which the representation can be filed are provided u/s 25(1) of the Patents Act 1970.
After filing the application for the grant of patent, a request for examination is required to be made by the applicant or by third party and thereafter it is taken up for examination by the Patent office. Usually, the First Examination Report is issued and the applicant is given an opportunity to correct the deficiencies in order to meet the objections raised in the said report.
The applicant must comply with the requirements within the prescribed time otherwise his application would be treated as deemed to have been abandoned. When all the requirements are met, the patent is granted and notified in the Patent office Journal. However before the grant of patent and after the publication of application, any person can make a representation for pre-grant opposition.