Trademark opposition may come at the stage after registrar has approved the trademark application on the distinctive factor and publishes the trademark in the journal to know whether any third parties have opposition. Anyone who finds a reason (ie: similarity with the mark he/she owns or The trademark is similar or identical to an earlier or existing registered trademark, the mark is devoid of distinctive character, the mark is descriptive in nature, application for the trademark is made with bad faith etc) to oppose the published trademark in the journal within 3 months, which can be extended to 1 more month (effectively 4 months) from the date of publication of journal. 