What a provisional patent application does
A provisional patent application is a simplified US patent filing that establishes a priority date without beginning examination. The USPTO does not examine provisionals — they automatically expire 12 months after filing unless the applicant files a non-provisional (or PCT) application claiming the provisional's priority date. Provisionals confer 'patent pending' status immediately upon filing, which can be commercially valuable and provides some protection from copying during the pending period. The key strategic benefit: the provisional filing date becomes the prior art cutoff date for the later non-provisional application. Prior art that arises between the provisional filing date and the non-provisional filing date cannot be used against the non-provisional — as long as the non-provisional is filed within 12 months of the provisional.
Requirements and what to include
A provisional application requires: a written description of the invention sufficient for a person of ordinary skill in the art to understand it; drawings if necessary to understand the invention (informal drawings are fine); and a cover sheet identifying the invention and the applicant. Notably, provisionals do not require formal patent claims, an oath or declaration, or formal drawings. However, the written description must adequately support any claims later filed in the non-provisional application that seek to benefit from the provisional's priority date. A common mistake is filing a rushed, incomplete provisional that does not describe all aspects of the invention — if the non-provisional later claims features not described in the provisional, those claims cannot benefit from the provisional priority date. The description should cover the key aspects of the invention: how it works, its components, preferred embodiments, and known variations.
The 12-month deadline and conversion
The provisional application automatically expires 12 months after filing. To preserve the priority date, the applicant must file a non-provisional patent application (or a PCT application) within those 12 months, claiming priority to the provisional. This conversion (technically a new filing that claims priority to the provisional, not a literal conversion of the provisional) triggers full USPTO examination. The 20-year patent term runs from the non-provisional filing date, not the provisional — so using the full 12 months of provisional pendency before filing the non-provisional delays the start of the 20-year term clock by up to 12 months, which is an additional benefit. There is no USPTO extension of the 12-month deadline — unlike some other deadlines, provisional expiration is strict. However, if multiple provisionals are filed covering the same invention, the non-provisional can claim priority to all of them.
Provisional priority for international filings
Under the Paris Convention, a US provisional establishes a priority date that foreign and PCT applications can claim within 12 months of the provisional filing. This is one of the provisional's most important strategic uses for startups: file a US provisional to establish a priority date at low cost, then file a PCT application 12 months later (claiming the provisional priority date) to start the international prosecution process. The PCT application gives an additional ~18 months before entering national phases in foreign countries (30 months total from the provisional priority date). A company can therefore use a provisional to extend its decision window on international patent protection from 12 months to 30 months from a single low-cost early filing. For PCT and foreign filings, the provisional's written description must adequately describe any claimed invention — thin provisionals create the same priority problem internationally as domestically.
Limitations and strategic considerations
Provisionals have important limitations. They do not create enforceable patent rights — only an issued patent provides the right to exclude. Patent-pending status is commercially useful but has limited legal force. A provisional cannot be amended after filing; it must stand as filed. If the invention changes or new features are added, a new provisional should be filed for the updated features, and the non-provisional can claim priority to both provisionals. Inventors who make a public disclosure before filing any patent application lose patent rights in most countries immediately (no grace period outside the US); the US provides a 12-month grace period for inventor disclosures, but filing a provisional before any disclosure is always safest. For startups, a good provisional strategy involves a thorough description of the invention written to adequately support anticipated broad claims — not a rushed disclosure that preserves priority date in name only.
USPTO fees and filing
Provisional application USPTO fees (2024): $320 large entity; $160 small entity; $80 micro-entity. Filing is done through USPTO's EFS-Web/Patent Center online system or by mail. The provisional is filed without formal claims, just the description, drawings, and cover sheet. The USPTO issues a filing receipt with a serial number but does not examine the application. The applicant can use 'Patent Pending' immediately upon filing. Within 12 months, the applicant must file the non-provisional and pay the non-provisional filing fees (which are significantly higher). Many practitioners now draft provisional applications with significant care, treating them similarly to a non-provisional specification (minus the formal claims section) to ensure the description is adequate to support broad claims — the small fee difference does not justify a carelessly drafted provisional that fails to establish priority for the claims that matter.
Frequently Asked Questions
What is a provisional patent application?
A provisional patent application is a lower-cost, simplified patent application that establishes an early US filing date without starting the formal examination process. Provisionals do not get examined by the USPTO, cannot become patents themselves, and automatically expire after 12 months. They establish patent-pending status and a priority date for any non-provisional (regular utility) patent application filed within 12 months. Key advantages: lower USPTO fees (approximately $320 for small entities, $160 for micro-entities in 2024); no claims required; no formal oath or declaration required; informal drawings are acceptable; no prior art search required by USPTO. Provisionals are particularly useful when: an inventor needs to disclose or present the invention publicly but is not ready to file a full application; a startup wants to establish a priority date while refining the product; the inventor needs time to assess whether the invention is worth the cost of a full application.
What must a provisional patent application contain?
A provisional patent application must contain: (1) a written description of the invention — this does not have to be in formal patent specification format, but it must adequately describe the invention so a person of ordinary skill in the art could understand it and it must support the claims that will be filed in the later non-provisional application; (2) drawings, if necessary to understand the invention (informal drawings acceptable); and (3) a cover sheet identifying the invention title, inventors, and designating it as a provisional application. Critically, the written description must be sufficient to support any claims in the non-provisional application that rely on the provisional's priority date. A thin provisional that describes only a vague concept will not adequately support broad claims in the non-provisional. Common mistakes: filing a one-page or overly brief provisional that fails to describe all aspects of the invention the applicant later wants to claim.
How long does patent-pending status last with a provisional?
Patent-pending status from a provisional application lasts 12 months from the provisional filing date. To preserve the priority date, a non-provisional US patent application (or a PCT application) must be filed within those 12 months. The provisional automatically abandons at the end of the 12-month period — it cannot be extended. If the non-provisional is filed within 12 months and claims priority to the provisional, the non-provisional will have a priority date equal to the provisional filing date for subject matter adequately described in the provisional. If the non-provisional is not filed within 12 months, the provisional priority date is lost and any non-provisional filed later will have a later priority date — meaning public disclosures, competitor filings, and other events in the intervening period become prior art.
Can I claim provisional priority for international (PCT and foreign) filings?
Yes. Under the Paris Convention, a US provisional patent application establishes a priority date that can be claimed in international and foreign patent filings. A PCT (Patent Cooperation Treaty) application or a direct foreign national filing can claim the provisional's priority date if filed within 12 months of the provisional. The PCT application then provides a 30-month window (from the provisional priority date) to enter national phases in foreign countries. This means a startup can file a provisional in January, file a PCT application the following January (12 months later), and then have until July of the following year (30 months from the provisional) to decide which countries to enter — using the provisional filing date as the priority date throughout.
What is the difference between a provisional and a non-provisional patent application?
Key differences: (1) Claims — non-provisionals require formal patent claims; provisionals do not. (2) Examination — non-provisionals are examined by the USPTO; provisionals are not. (3) Fees — provisionals have much lower filing fees than non-provisionals. (4) Duration — provisionals last 12 months and then expire; non-provisionals remain pending until granted or abandoned, and issued patents last up to 20 years. (5) Formal requirements — non-provisionals require a formal specification, formal claims, abstract, oath/declaration, and formal drawings; provisionals just need a description and cover sheet. (6) Patent term — the 20-year patent term runs from the non-provisional filing date, not the provisional date. This means filing a provisional delays the start of the 20-year clock by up to 12 months, which is a benefit. (7) Publication — non-provisionals publish 18 months after the earliest priority date; provisionals are not published.