US Provisional Patent Applications: A 2026 Strategy Guide

A US provisional application is the cheapest way to put a stake in the ground. It locks in a filing date for whatever you actually describe, buys you twelve months to build evidence and talk to the market, and costs a fraction of a full utility filing. For founders and R&D teams, especially in software and AI, it is usually the right first move.

The catch is that a provisional is only worth what it teaches. This guide covers what to put in one, how the twelve months should be spent, and where teams lose the priority date they thought they had.

What a Provisional Is, and What It Is Not

A provisional application is filed under 35 U.S.C. 111(b). It establishes an early filing date without claims, without examination, and without an oath or declaration.

To be worth anything, it must include a specification that meets 35 U.S.C. 112(a): written description and enablement, plus any drawings needed to understand the invention. The filing date only covers what the provisional actually teaches at that level. Anything you add later gets the later date.

Three consequences follow:

• It is not examined. Nobody at the USPTO reads it on the merits. Filing one does not make anything patentable.
• It expires. A provisional goes abandoned twelve months after filing unless you file a non-provisional claiming its benefit under 35 U.S.C. 119(e). There are no extensions.
• It does not start the patent term. The 20-year term runs from the non-provisional filing date, so a provisional year is effectively free term at the front end.

Within those twelve months you can also file abroad and claim Paris Convention priority in member countries, from the same date.

If terms like enablement, priority date, and non-provisional are new, our glossary defines them.

What It Costs

The USPTO provisional filing fee depends on your entity status: micro entity, small entity, or large entity, with micro the lowest by a wide margin. Certify the right status when you file, because paying the undiscounted fee is a pure waste, and a wrong certification is worse. The current amounts are on the USPTO fee schedule, linked at the end of this page.

Government fees are the small part. The real cost of a good provisional is the drafting, because the disclosure is the asset. For what a prepared and filed provisional costs with us, see our pricing page and our patent filing service.

Filing electronically through Patent Center avoids paper surcharges.

Filing a Provisional, Step by Step

1. Write the specification. Content is everything.

Draft a detailed technical description that meets Section 112(a). For software and AI, that means architectures, data flows, training setups, feature engineering, and implementation details such as latency reduction techniques or memory layouts, at a level that lets a skilled engineer build it without undue experimentation. Add drawings and flowcharts where they help. Claims are optional at this stage.

2. File electronically through Patent Center.

Select the provisional application type, attach the PDF, and pay online.

3. Include the cover sheet.

Use the provisional cover sheet (form SB/16). The law does not require claims or a declaration, but the cover sheet is what lets the USPTO process the filing correctly.

4. Keep the filing receipt.

The receipt confirms the filing date, which is your priority date for the subject matter you disclosed.

5. Calendar the twelve-month deadline on the day you file.

Not at month ten, when someone remembers. The day you file.

The Twelve-Month Plan

The provisional year is a research plan, not a waiting period. A workable cadence:

• Month 0 to 1. File as soon as you can meet Section 112(a). Capture the core architecture plus the variants you can foresee, not only the configuration you happen to have running.
• Months 2 to 6. Validate the market. Update technical documentation and drawings as the product changes. If you make a material improvement, consider a follow-on provisional to lock that date too.
• Months 3 to 9. Build the data. Run benchmarks, ablations, and optimizations. Record the baselines and test conditions, not just the headline result.
• Months 7 to 10. Scope the claims around what customers actually value. Decide whether you want a PCT or direct foreign filings tied to your earliest US date.
• Months 10 to 12. File the non-provisional or non-provisionals claiming priority. Aim for a near-final draft at month ten so nobody is rushing in the final fortnight.

Serial provisionals work well when the technology is moving quickly. Each one can roll into a single non-provisional within twelve months of the earliest, or you can split the family deliberately. The discipline is calendar discipline.

Provisional First, or Straight to a Non-Provisional?

There is no single right answer, but the patterns are clear.

Provisional first suits most early-stage teams. You get "patent pending" and a priority date at low cash cost, then use the year to test demand, iterate, and gather the evidence that will shape the claims. It defers the heavier drafting and the examination fees until the signal is stronger.

Straight to a non-provisional makes sense when the invention is stable and validated, when a competitor or an investor diligence timetable needs examined claims sooner, or when a foreign filing strategy benefits from the earlier formal filing. You start the 20-year clock sooner, and you start prosecution sooner.

Staged filings sit in between: one comprehensive provisional covering the core plus variants, then one or more non-provisionals aimed at different commercial angles, all within twelve months of each provisional.

A non-provisional carries separate USPTO charges at filing (basic filing, search, and examination) and an issue fee if it is allowed. Budget for all of them plus prosecution, not just the filing line.

Software and AI: Two Things to Get Right

Inventorship stays human. Only natural persons can be named as inventors on a US patent. AI tools can assist, and using them changes nothing about that rule. Document who conceived which elements: for AI-assisted work, that means the human decisions about model architecture, loss functions, training regimes, or deployment configuration that produced the improvement. If a foreign filing in your family named an AI as an inventor, get advice before you rely on it for US priority.

Tie the invention to a technical improvement. Eligibility under 35 U.S.C. 101 turns on whether the claims do something concrete and technical rather than describing an abstract idea implemented on a computer. The place to win that argument is the specification you file now. During prosecution, a declaration under 37 C.F.R. 1.132 can put expert technical evidence in front of the examiner: reduced storage or computation, better accuracy, lower latency, measured against a stated baseline. That declaration can only draw on facts your application already supports.

So write the provisional as the evidentiary foundation for that argument. Include test setups, datasets, baselines, and observed improvements against them. Quantified results with stated conditions are worth far more later than adjectives.

How Other Countries Compare

The US provisional is unusually forgiving. Most other systems do not have a direct equivalent.

• Europe (EPO), the UK, and Canada have no provisional route. You file a complete application, and the Paris Convention gives you twelve months to extend it abroad. European practice requires a technical character for software-related inventions.
• India and Australia do allow a provisional specification followed by a complete application, which works much like the US route.
• Japan, Korea, and China have no provisional filing. Priority runs from the first complete application.

Everywhere, an AI system cannot be named as an inventor, and software claims need a technical effect rather than a business outcome. The practical takeaway is the same: use the US provisional year to assemble the technical record that stricter offices will expect.

Where Teams Lose the Date

• Thin disclosure. If the provisional does not enable what you later claim, you lose the early date for that subject matter. This is the single most common failure, and it is invisible until years later.
• Idea-level placeholders. A one-page summary filed to say "patent pending" gives you a date for a one-page summary.
• Vague software descriptions. Without concrete technical detail and measured effects, there is nothing to build an eligibility argument on.
• Missing the twelve months. No extensions. Filing late means a later priority date, and any public disclosure in the meantime is now prior art against you.
• Public disclosure before filing. Demo days, launches, and investor decks that give away enabling detail can complicate patentability, especially abroad. File first.
• Wrong entity certification. Easy to fix at the start, awkward to fix later.

Checklist: What to Include in a Software or AI Provisional

• The problem, tied to a computing limitation such as latency, memory, bandwidth, or accuracy drift
• System architecture and modules, data flows, training and inference pipelines
• The concrete technical levers, for example scheduler design, cache eviction, compiler passes
• Quantified improvements against stated baselines, with test conditions and datasets
• Alternatives and ranges that still achieve the effect, so later claims have support
• Implementation contexts: edge devices, cloud accelerators, mixed-precision constraints
• A record of who conceived what, and when
• The provisional cover sheet, consistent inventor names, and electronic filing

How We Help

We draft provisionals that carry their weight: Section 112(a) specifications written for software and AI, sequenced filings when the technology is moving fast, and conversion to a non-provisional with the technical evidence already in place. We also coordinate Paris Convention timelines so your foreign options stay open without overcommitting the budget.

Start with our patent filing service and we will map the twelve-month plan with you.

Sources

• USPTO: provisional application for patent
• USPTO fee schedule
• USPTO: MPEP 601
• WIPO: Paris Convention, Article 4 (priority)