A provisional patent application is a lower-cost, lower-formality filing that establishes a priority date with the United States Patent and Trademark Office (USPTO) without starting the formal examination clock. You get 12 months from the filing date to decide whether to convert it into a full utility application — and if you do, you can claim the provisional's earlier priority date.
That 12-month window is the whole point. It gives you time to test the market, refine the invention, attract investors, and decide whether the invention is worth the cost of a full patent — before you commit to the full process.
What a provisional does (and doesn't do)
A provisional application gives you the right to use the phrase "patent pending," which has real commercial and competitive value. It establishes your priority date against any competing inventors who might file later. And it buys you time.
What it doesn't do: it doesn't get examined, it doesn't result in a patent on its own, and it automatically expires after 12 months if you don't convert it. If you miss the conversion window, you lose the priority date and have to start over.
Key dates to know
From the provisional filing date, you have 12 months to file a corresponding utility application (or PCT application for international coverage). This deadline is hard — there are no extensions.
When filing a provisional makes sense
A provisional is the right move when you need to lock in a priority date quickly — before a conference presentation, a product launch, or a public demo — but you're not ready to commit to the full utility application. It's also useful when the invention is still evolving and you expect to have a clearer picture in a few months.
What to include in the provisional
The USPTO has minimal formal requirements for provisionals, but the disclosure quality matters enormously. A weak provisional that doesn't fully describe the invention won't effectively support a later utility application, even if the filing date carries over.
- A clear description of the invention and how it works
- At least one specific implementation or embodiment
- Enough detail that someone skilled in the field could reproduce it
- Drawings or diagrams where helpful (not required, but recommended)
Cost and filing fees
The USPTO filing fee for a provisional application is $320 for standard entities and $160 for small entities (companies with fewer than 500 employees). Micro entities — individual inventors and qualifying small businesses — pay $80. These fees are significantly lower than a full utility application.
The real cost is drafting. A well-written provisional needs to describe the invention thoroughly enough to support a full utility application later. Rushing this step creates problems down the line.