Provisional vs Complete Patent in India: Which to File First

You have a working prototype, an investor demo in three weeks, and a competitor that just announced something suspiciously close to your architecture. Filing a complete patent specification takes six weeks of careful drafting. Filing a provisional takes three days. Under Section 9 of the Patents Act, 1970, the provisional gives you the priority date you need now, with 12 months to file the complete after that. For most software, hardware, and pharma founders in India, this is the right move — but only if you understand what each filing actually does and what it doesn’t.

Every Indian patent application is filed under one of two routes: Section 9 (provisional specification) or Section 10 (complete specification, drafted to the requirements of Section 10(4)). Both use Form 1 (the application) and Form 2 (the specification). Both attract the same government fee. The difference is what goes inside the specification and what the filing buys you. This guide walks through the decision frame.

Priority is a moment in time. The provisional captures the moment. The complete builds the house.

What each filing actually does

A provisional specification is a placeholder. It describes the invention well enough that a person skilled in the art can recognise what is being protected, but it does not require claims, abstract, or full enabling disclosure. It exists to lock in the priority date under Section 11. From that date, no later filing for the same invention — by you or anyone else — can predate you.

A complete specification is the real patent application. Drafted under Section 10(4), it contains the full description, claims, abstract, drawings, and best method. It is the document the Controller examines. Without a complete specification, no patent grants. With it, your invention enters the formal examination queue.

When provisional is the right call

File provisional when any of these is true:

• The invention is still evolving. Hardware iteration, software with active refactoring, pharma molecules in optimisation. Provisional locks priority while you iterate.
• You have a near-term external event. Investor pitch, conference talk, product launch, demo day. Filing before any public disclosure protects novelty.
• You can’t afford a complete spec yet. Drafting a complete spec costs ₹40,000-1,50,000 in attorney fees. Provisional drafting costs a third of that, with the same priority benefit.
• You will go international. Filing PCT within 12 months of an Indian provisional preserves Indian priority across 150+ PCT member countries.

When you should skip provisional

Go straight to complete when:

• The invention is fully crystallised. No further iteration expected. Specification can be drafted with confidence today.
• You want examination to start now. The 48-month examination request clock (Section 11B) runs from the priority date for provisional. For complete, examination request can be filed immediately.
• Single domestic product, no international plans. Provisional is most valuable for global expansion via PCT. Pure-India patents often skip provisional.
• Disclosure has already happened. Section 31 grace period covers some prior disclosures, but you should still file complete to minimise novelty risk.

Fees, forms, and timeline

Indian patent filings use a consistent fee schedule based on applicant type:

• Individuals, startups (DPIIT-recognised), small entities, educational institutions: ₹1,750 per application (e-filing)
• Other entities (large companies): ₹8,000 per application (e-filing)

Forms involved:

• Form 1 — Application for grant of patent
• Form 2 — Specification (either provisional or complete; flagged on the form)
• Form 5 — Declaration as to inventorship (only with complete specification)
• Form 18 — Request for examination (RFE), filed within 48 months
• Form 26 — Power of authority (if filing through an agent)
• Form 9 — Request for early publication (optional, accelerates examination)

The 12-month conversion rule

Section 9(1) is unforgiving. You have 12 months from the date of filing the provisional to file a complete specification covering the same invention. Miss the deadline and the application is deemed abandoned. You lose the priority date. Refiling fresh starts the clock over from the new filing date.

After filing: examination, FER, grant

Once the complete specification is on file, the examination clock starts. The flow:

1. Publication (Section 11A) — the application is published 18 months after priority. From this point, the contents are public.
2. Request for examination (Form 18, Section 11B) — must be filed within 48 months of priority. Without RFE, the application lapses.
3. First Examination Report (FER) — the examiner identifies objections under Section 25 (prior art), Section 3 (non-patentable subject matter), or formal grounds. Typical FER timing: 12 to 18 months after RFE.
4. Response to FER — within 6 months (extendable by 3 months on payment). Responses can include claim amendments and argument.
5. Hearing if called — the Controller may schedule a hearing if the FER response isn’t accepted.
6. Grant or refusal — if accepted, patent grants and is published in the Patent Office Journal. Term is 20 years from filing date under Section 53.

Common mistakes founders make

1. Filing a too-narrow provisional. A provisional describing only your current implementation can’t support broader claims at complete stage — you lose claim scope you would have had with a properly drafted provisional.
2. Disclosing publicly before filing. Investor pitch decks, demo videos, conference talks — all count as public disclosure under Section 25(1)(b). File before any external disclosure.
3. Missing RFE. 48 months feels long until the founder is heads-down on shipping. Set a calendar reminder at month 36, not month 47.
4. Skipping patentability search. Filing without searching prior art means filing into known objections. Spend ₹15,000 on a search before ₹50,000 on drafting.
5. Filing too many provisionals. Each provisional you don’t convert loses priority. Two unfocused provisionals are worth less than one good complete.

Provisional buys you time. Complete buys you a patent.

People also ask

Frequently asked questions

What is the fee difference between provisional and complete specification?

Both attract the same statutory fee. ₹1,750 per application for individuals, startups (DPIIT), and small entities. ₹8,000 for others (large companies). The fee is paid once per application, not twice for provisional and complete.

How long does an Indian patent take to grant?

From provisional filing to grant typically takes 3 to 5 years. The complete specification triggers the examination request window (48 months under Section 11B), and First Examination Report (FER) usually issues 12-18 months after the request.

Can I file an international PCT application from a provisional?

Yes, and this is the most common path. File provisional, then within 12 months file PCT designating your target countries. PCT entry preserves the Indian priority date globally. PCT route adds significant flexibility for international expansion.

Do I need a patent attorney to file provisional?

Not legally. You can self-file as an inventor. Practically, the description needs technical and legal sufficiency — if too narrow, your complete specification can’t expand later. Attorney involvement at provisional stage saves significant rework.

What is the difference between Form 2 provisional and Form 2 complete?

Same form (Form 2), different content. Provisional = description + drawings, no claims required. Complete = description + claims + abstract + drawings, fully formed for examination.

For most Indian deep-tech and pharma startups, the standard path is: provisional first, complete specification at month 10-11, and PCT entry at month 11.5 if international protection is on the roadmap. That sequence preserves maximum optionality.

The priority date is a deadline that runs both ways. Yours, and your competitor’s.