https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/india/filing-grant/what-do-i-need-do
What do I need to do to get an early filing date in India?
For non-Convention applications it is possible to get an early filing date by filing a provisional specification, which has to be followed by a complete specification within 12 months of filing. Provisional specifications cannot be filed for divisional, Convention or PCT national phase applications.
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