What Is a Provisional Patent Application?

A provisional patent application is a preliminary filing that establishes a priority date for your invention without beginning formal examination. It is a placeholder — a way to stake your claim on a filing date while buying 12 months to prepare the full, formal application.

The provisional is available in the US (and functionally equivalent mechanisms exist in Australia, India, and a few other jurisdictions). It does not exist in all countries — notably, the EPO, CNIPA, JPO, and KIPO do not have provisional applications, though the 12-month Paris Convention priority window serves a similar time-buying function.

What a Provisional Does

Establishes a priority date. The filing date of the provisional becomes the priority date for any subsequent applications that claim its benefit. This date determines what counts as prior art against your claims.

Creates "patent pending" status. Once filed, you can legitimately mark your invention as "patent pending" — signalling to competitors and potential licensees that protection is in process.

Buys 12 months of time. The provisional expires after 12 months. During this window, you can refine the invention, test the market, seek funding, and prepare the full non-provisional application. At the end of the 12 months, you must file a non-provisional (or PCT) application claiming priority to the provisional — or the priority date is lost.

What a Provisional Does Not Do

It does not get examined. No examiner will ever read your provisional. It sits in the patent office, establishing a date and nothing more.

It does not become a patent. A provisional automatically expires after 12 months. If you do not file a non-provisional or PCT application within that window, the provisional dies and you have no pending patent application.

It does not provide enforceable rights. You cannot sue anyone based on a provisional. Patent rights only arise from a granted non-provisional patent.

It does not protect you internationally by itself. A provisional establishes a US priority date. To get international protection, you must file a PCT application or national applications in other countries within 12 months, claiming priority to the provisional.

What the Provisional Must Contain

The provisional must adequately describe the invention — in enough detail that the later non-provisional application can claim priority to it. A thin, vague provisional creates a weak foundation: claims in the non-provisional that go beyond what the provisional disclosed will not get the provisional's priority date.

A well-drafted provisional includes a detailed description of the invention, all known variations and alternative embodiments, drawings or sketches, and a clear explanation of the problem being solved and how the invention solves it. It does not require formal claims (though including draft claims is good practice).

The cost of a provisional is low — as little as $80 in USPTO government fees for a micro entity. Attorney-prepared provisionals typically cost $2,000–$5,000 total. Self-filed provisionals are possible but carry the risk of inadequate disclosure.

The Strategic Role of Provisionals

Provisionals are most valuable in three situations: when you need to establish a priority date quickly (because a disclosure, trade show, or competitor filing is imminent), when you want to test commercial viability before committing to full prosecution costs, and when you need "patent pending" status for investor or licensing discussions.

For a deeper exploration of when provisionals make sense and when they do not — including how they compare to non-provisional filings — see our full guide.

Sources

1. 35 U.S.C. § 111(b) — Provisional Application — US statutory basis for provisional patent applications
2. USPTO Provisional Patent Application — Filing requirements, fees, and procedures for US provisionals
3. MPEP § 201.04 — Provisional Applications — Detailed guidance on provisional application practice
4. Paris Convention — Right of Priority — International priority right enabling global filing from a provisional