A provisional patent application gives you a U.S. filing date for your invention and 12 months to decide whether to file a full (nonprovisional) application. It’s a lower-cost, lower-formality first step, but it only protects what it actually describes. A thin provisional can leave you with a filing date that doesn’t cover the product you end up selling.

This guide covers what a provisional does, what to put in it, what it costs, how to use the 12 months well, and a few points specific to software and app inventions. It’s general information, not legal advice, and reading it doesn’t create an attorney-client relationship.

What a provisional patent application is

A provisional is a U.S. patent filing that doesn’t need formal claims, an oath or declaration, or an information disclosure statement. The USPTO doesn’t examine it, and it never turns into a patent on its own.

What it does is set a filing date. If you file a nonprovisional application within 12 months that claims the provisional’s benefit, the later application can rely on that earlier date for anything the provisional adequately described. After filing, you can accurately call the invention “patent pending.”

“Patent pending” is a notice, not protection. It doesn’t let you sue anyone, and it doesn’t promise a patent will issue.

What a provisional does and doesn’t do

It can:

• Lock in an early filing date, which matters under the U.S. first-inventor-to-file system if someone else files on similar subject matter or a publication appears later.
• Give you a year to test a prototype, talk to customers, or raise money before committing to the larger cost of a nonprovisional.
• Serve as the priority filing for foreign or international (PCT) applications, which generally must also be filed within the same 12 months.

It can’t:

• Give you enforceable rights or stop a competitor from copying your product.
• Be examined, published, or extended into a patent by itself.
• Protect improvements you make after filing. New features get their own, later filing date.
• Preserve foreign rights if you publicly disclose before filing. Many countries require absolute novelty, so a launch or pitch before any filing can cost you protection abroad.

What to include: the part that decides whether it works

The legal test is whether the provisional describes the invention well enough that someone skilled in the field could make and use it. The later claims only get the provisional’s date if the provisional supports them. That’s why “what to include” is the most important part of this article.

A strong provisional usually has:

1. A clear description of the problem and the solution. Explain what existing products or methods do, what’s wrong with them, and how your invention works differently.
2. Structure and operation in detail. Name the parts, how they connect, and what happens step by step when the invention is used. Dimensions, materials, ranges, and operating conditions help when they matter.
3. Drawings. They don’t need to be formal patent drawings, but they should be clear: sketches, CAD views, block diagrams, or flowcharts, with reference numbers that match the text.
4. Alternatives and variations. List other materials, shapes, arrangements, and use cases you can reasonably foresee. If a feature could be done three ways, describe all three. This is what keeps a later claim from being narrower than the product.
5. The features you think set it apart. Even without formal claims, it helps to state what you believe is new. Some practitioners include draft claims to test whether the description supports them.
6. Test data or results, if you have them. Results can show the invention works and support later arguments about its advantages.

What usually goes wrong: filing a slide deck, a one-page summary, or a marketing sheet as the whole provisional. Those documents describe benefits, not how the thing works.

What a provisional costs

The USPTO filing fee for a provisional is $325 for a large entity, $130 for a small entity, or $65 for a micro entity. Most individual inventors and small Iowa businesses qualify for small-entity status, and some qualify as micro entities. Check the USPTO fee schedule before filing, since fees change.

The government fee is the small part. The real cost is preparation time, and it depends on how complex the technology is, how much written material and drawings you already have, and how close the provisional is to a full application. A provisional drafted to nonprovisional quality costs more up front but often saves work at month twelve. For the full picture, including the nonprovisional, examination, issue, and maintenance fees, see How Much Does a Patent Cost?

The 12-month checklist

The 12-month deadline to claim a provisional’s benefit can’t simply be extended because you need more time. (There is a narrow two-month restoration window if the delay was unintentional, but it requires a petition and fee, and you shouldn’t plan around it.) Here’s a practical way to use the year:

Before filing

• Collect dated sketches, CAD files, test notes, source code descriptions, and a plain-language explanation of how it works.
• List everyone who contributed to the idea, and check employment, university, or contractor agreements that may affect who owns it.
• Note any public disclosures already made, such as a website, sale, demo, social post, or pitch. Tell your attorney about every one.
• Use NDAs for any conversations that must happen before filing. See Do I Need an NDA Before I Show My Invention?

Months 1–3

• Calendar the 12-month deadline in more than one place, plus reminders at month 9 and month 10.
• Keep a log of improvements and design changes with dates. Anything new may need its own provisional.
• Consider a patentability search if you didn’t do one before filing.

Months 4–8

• Gather market feedback: customer interest, pilot results, investor questions.
• Decide which features actually matter commercially. Those are the ones the nonprovisional claims should focus on.
• If you made significant improvements, consider filing an additional provisional so the new material gets an earlier date.

Months 9–10

• Make the go/no-go decision. Options include a U.S. nonprovisional, a PCT application, direct foreign filings, a different protection strategy (such as trade secret), or letting it lapse.
• If filing, start drafting now. A good nonprovisional takes weeks, not days.

Months 11–12

• Finalize and file before the deadline. Don’t leave the filing for the last week.

Software and app provisionals

Software inventions need extra care because of patent-eligibility rules. Courts apply the Alice test, which asks whether a claim is directed to an abstract idea and, if so, whether it adds something more. A provisional that only says what the app does for the user (“lets farmers track field data on a phone”) tends to read as an abstract idea.

For a software provisional, describe how the system works technically: the architecture, data structures, flowcharts of key processes, and the specific technical problem solved, such as reduced latency, less memory use, or a more reliable sensor reading. Those details are what later claims and arguments will lean on. For the eligibility background, see Alice and Section 101 in Plain English and our software patents page.

Common mistakes

• Filing too little detail. The follow-on application can’t claim the provisional’s date for anything the provisional didn’t describe.
• Missing the deadline. Once the 12 months pass without a proper follow-on filing, the provisional’s date is generally lost.
• Disclosing before filing. U.S. law has a limited one-year grace period for the inventor’s own disclosures, but most foreign countries don’t.
• Ignoring ownership. Confirm who owns the invention before filing, especially with co-founders, employees, or contractors. Our startup IP checklist covers the basics.
• Treating “patent pending” as protection. It signals an application exists; it doesn’t stop copying.

Frequently asked questions

Can I file a provisional myself?
Yes, the USPTO accepts filings from inventors. The risk is that a self-written provisional often lacks the detail needed to support later claims, and you may not learn that until it’s too late to fix.

Does a provisional get published?
Not by itself. It becomes publicly available only if a later application that claims its benefit is published or issues as a patent.

Can I file more than one provisional?
Yes. A nonprovisional can claim the benefit of several provisionals filed within the prior 12 months, which is a common way to capture improvements.

Should I skip the provisional and file a nonprovisional?
Sometimes. If the design is settled and you’re ready to commit, going straight to a nonprovisional can start examination sooner. See our step-by-step guide to getting a patent in Iowa.

Talk with an Iowa patent attorney

Jason Sytsma is a registered patent attorney with an electrical engineering degree from Iowa State University, working with inventors and businesses in Cedar Rapids and across Eastern Iowa. Learn more on the About Jason page, see the patents overview, or read his official firm profile at Shuttleworth & Ingersoll.

If you’re deciding whether a provisional fits your invention and timeline, request a consultation.

This article is attorney advertising and general educational information, not legal advice. Reading it does not create an attorney-client relationship. Every situation is different, and prior results do not guarantee a similar outcome.