What is a provisional patent application?

A provisional patent application is a filing with the USPTO that establishes a priority date for an invention but is never examined and never becomes a patent on its own. It is valid for 12 months, after which it expires automatically unless a corresponding non-provisional (utility) application claiming its benefit is filed. The primary purpose of a provisional is to establish an early priority date — the date that matters for determining what prior art can be used against the invention.

What a provisional does

Filing a provisional gives the inventor a 12-month period during which:

• The invention is "patent pending" — the inventor can use this designation in marketing materials and product labeling.
• Public disclosures, sales, or publications made during the 12 months do not become prior art against the inventor's own patent application (under AIA § 102(b)(1)).
• The inventor has time to develop the invention further, assess market potential, and refine the claims before committing to the higher cost of a non-provisional application.
• Competitors who file after the provisional date cannot use that period of exclusivity to establish earlier priority.

What a provisional does not do

A provisional application is not examined by the USPTO. It does not mature into a patent. If no non-provisional application claiming the provisional's benefit is filed within 12 months, the provisional expires and the priority date is lost. The inventor does not receive a patent number, and the provisional is not published (it becomes abandoned and is maintained in confidence).

Provisionals also have a specific limitation regarding claims: a provisional application does not need to include formal claims, but the non-provisional application can only claim the benefit of the provisional's filing date for subject matter that is adequately disclosed in the provisional. A provisional that broadly describes an invention but lacks detail about a specific embodiment cannot provide a priority date for a non-provisional claim directed to that embodiment.

Filing requirements and fees

Provisional applications require a specification (description of the invention), any drawings necessary to understand the invention, the inventor's name(s), and the filing fee. They do not require formal patent claims, an inventor's declaration, or information disclosure statements — though all of these will be required in the subsequent non-provisional.

USPTO fees for provisional applications are lower than for non-provisional filings. As a rough reference point, the USPTO basic filing fee for a provisional is several hundred dollars for a micro entity (specific income and filing quantity thresholds apply), with higher fees for small entities and large entities. Always verify current fees in the USPTO Fee Schedule, as patent fees adjust periodically.

Strategic uses of provisionals

Patent practitioners commonly recommend provisionals when an inventor needs to publicly disclose an invention (at a conference, in a publication, or to potential investors) before the full non-provisional is ready. Filing a provisional before the disclosure preserves the inventor's options and establishes a priority date that precedes the public disclosure. Without the provisional, the public disclosure itself would start the one-year AIA grace period clock.