A patent application with the Indian Patent Office must be filed in a specific format and with a set of required forms. How to file a patent application?• Documents can be filed in the patent office. To file a patent application, you will have to submit form 1, form 2, form 3 and form 5. I'll show to you how to fill in details in Form 1 form 2 and form five the essential fonts which need to go along with a patent application. Under the Indian patent law, national phase (NP) patent applications are required to be filed within 31 months from the earliest priority date. How to File a Patent in India? The applicant(s) is also required to undertake to provide details of any new filings outside India under Section. 8(1)(b) within six months of such new filing. As DO: The payment of fees must be effected in INR.