Provisional Patent Application

It does not grant any patent rights

A provisional is not a patent. It grants no right to exclude anyone from making, using, or selling your invention. You cannot enforce a provisional against infringers. Patent rights arise only after a non-provisional application is examined and a patent is granted.

It does not auto-convert to a patent

A provisional application automatically goes abandoned after 12 months. It never becomes a patent on its own. You must file a non-provisional application (or a PCT application) within 12 months and claim the provisional's benefit — or your priority date is lost. The 12-month deadline is strict with no extension.

It protects only what it actually discloses

This is the most important limitation. Your priority date applies only to subject matter actually disclosed in the provisional — not to improvements or variations you add later. If your provisional describes Version 1 of your invention and you claim broader features in the non-provisional that weren't in the provisional, those broader features only get the later non-provisional filing date. A thin provisional gives you a thin priority date.

It does not start prosecution

No examination occurs during a provisional's pendency. The USPTO does not review it for novelty, obviousness, or eligibility. No examiner reads it. It simply sits in the system until it is either claimed by a non-provisional or abandoned.

A written description enabling the invention

The description must be enabling: it must describe the invention in sufficient detail that a person having ordinary skill in the relevant field could make and use the invention without undue experimentation. This is the § 112(a) written description and enablement requirement — the same standard that applies to non-provisionals. A description of the concept without the 'how' will not satisfy this requirement.

At least one drawing (if helpful or necessary)

Drawings are required when necessary to understand the invention. For mechanical, electrical, and software inventions, drawings are almost always necessary. Include annotated diagrams, flowcharts, system architecture figures, and circuit diagrams as appropriate. Unlike non-provisionals, there are no formal drawing requirements (sheet size, reference numerals in all views, etc.) for provisionals — clear, understandable drawings suffice.

Identification of all inventors

The provisional must identify the inventor(s). Each inventor must have contributed to the conception of at least one claim that will eventually be in the non-provisional. If your team includes employees, consultants, or collaborators, confirm who contributed to conception (not just reduction to practice) before filing.

The filing fee and a cover sheet

The USPTO requires a cover sheet identifying the application as a provisional, the title of the invention, and all inventors. The filing fee is $60 (micro entity), $160 (small entity: individual, <500 employees, qualifying non-profit), or $325 (large entity). The fee can be paid online via EFS-Web/Patent Center at the time of filing.

Micro entity

$60

Individual inventors who: (1) qualify as small entity, (2) have not been named inventor on more than 4 prior patent applications, and (3) have gross income ≤ ~$239,000/year (adjusted), and (4) the rights are not assigned to a non-qualifying institution.

Small entity

$160

Individuals, companies with fewer than 500 employees, universities, and qualifying non-profit organizations.

Large entity

$325

All other applicants, including large corporations.

Disclose everything you know

Document every variation, embodiment, alternative material, alternative process step, and potential use case — even ones you think are obvious or unlikely. Your priority date covers only what the provisional discloses. Every alternative you omit is a gap a competitor can exploit. Think of a provisional as a brain dump, not a formal document. You can always narrow in the non-provisional claims; you cannot add new matter.

File before any public disclosure

A provisional filed before any public disclosure, publication, demo, conference presentation, or offer for sale eliminates the on-sale bar and public-disclosure bar risks for the U.S. and preserves your right to file foreign patents (which have no grace period in most countries). Never present at a conference or show a product to a customer without a provisional already on file.

Use the 12 months actively, not passively

Set a calendar reminder for month 9 and month 11. Month 9: have a patent attorney begin drafting the non-provisional claims. Month 11: file the non-provisional or PCT. Do not let the deadline sneak up. The 12-month deadline has no extension. Missing it means losing your priority date, and if you disclosed publicly in the meantime, you may have no path to a valid patent in most foreign countries.

File multiple provisionals as the invention develops

If your invention evolves significantly during the 12-month provisional period, file supplemental provisionals capturing new developments. Each supplemental provisional gets its own filing date. When you file the non-provisional, you can claim priority from multiple provisionals under § 119(e). The non-provisional gets the benefit of the earliest filing date for subject matter disclosed in that earlier provisional.

Include informal claims for claim strategy

Although claims are not required in a provisional, including a draft set of claims helps your future patent attorney understand the intended scope and provides a stronger record. If your provisional includes claims, the non-provisional claims can more easily be tied to the provisional's disclosure. This reduces the risk that added non-provisional claim limitations go beyond what the provisional discloses.