How to File a Provisional Patent
You file a provisional patent by sending the USPTO a written description of your invention, drawings if you have them, a cover sheet, and a filing fee, usually through the agency’s online Patent Center. That’s the short version. No lawyer required, no formal claims to draft. What actually matters is whether your description is thorough enough that a stranger in your field could read it and understand exactly what you built.
Below is the process in order, along with the parts people tend to get wrong.
Get Your Materials Together First
Most of the trouble with provisional applications happens before anyone even opens the filing portal. People rush the description, figuring they’ll “fix it later” in the real application. You can’t. Whatever isn’t in the provisional doesn’t get the early filing date.
Here’s what you’ll want on hand before you start:
- A written explanation of how the invention works, what it’s made of, and how someone would use it
- Drawings or sketches, even rough ones, if a picture would help someone understand the design
- Names and contact details for every inventor involved
- A way to pay the filing fee
- A USPTO.gov account, since Patent Center is basically the standard way to file now
Write the Description Like You Mean It
This is where people cut corners, and it’s the one part you really shouldn’t. There’s no required claim language in a provisional, which is exactly why it’s tempting to write something thin. Don’t. Cover the problem your invention solves, how it’s put together, what materials or parts go into it, and any variations you can imagine someone else trying. A one-page summary rarely holds up later. If your nonprovisional application eventually tries to claim something the provisional never actually described, that priority date won’t cover it.
Add Drawings If They Help
Formal patent drawings aren’t required at this stage the way they are for a nonprovisional filing. A clear sketch, a CAD export, or even a labeled photo can work fine, as long as it actually supports what you wrote rather than just sitting there looking official. If a reader would understand your invention better with a picture, include one.
Fill Out the Cover Sheet
Every provisional filing needs a cover sheet identifying it as such, along with the inventors’ names, a title for the invention, and where the USPTO should send correspondence. The agency has a standard form for this, PTO/SB/16, and it’s straightforward enough to fill out yourself.
File It Through Patent Center
Nearly everyone files provisional applications electronically now, through the USPTO’s Patent Center system. You upload your description, drawings, and cover sheet as PDF or DOCX files and pay the fee right there in the same session. Electronic filing also sidesteps the extra non-electronic filing fee that paper nonprovisional filings get hit with, though that particular charge was never something provisional filers had to worry about anyway.
Pay the Fee
Per the USPTO’s current fee schedule, filing a provisional application costs $325 for a large entity, $130 if you qualify as a small entity, and $65 for micro entity status. Which category you fall into depends on things like your company’s size and any past licensing activity, so check the USPTO’s entity rules if you’re not sure where you land.
Save Your Filing Receipt
Once the USPTO accepts everything, you’ll get a filing receipt with an application number and an official filing date attached. That date is your priority date, the one you’d point to if someone else files something similar down the road. Keep that receipt somewhere you won’t lose it. You’ll need the application number again when you file the nonprovisional application later.
Don’t Forget the 12-Month Clock
A provisional application is only good for a year from its filing date, and there’s no extending that window. Miss it, and the priority date is gone. Since drafting a full nonprovisional application with real claims takes more time than most people expect, set a reminder for well before the deadline rather than the week of it.
Filing It Yourself vs Hiring an Attorney
| Factor | Filing It Yourself | Working With a Patent Attorney or Agent |
|---|---|---|
| Upfront cost | Just the USPTO filing fee | Higher, since it includes drafting and review time |
| Time investment | Depends on how much detail you’re able to write yourself | Usually quicker, since someone else is doing the drafting |
| Risk of a thin filing | Higher if you’re new to patent writing | Lower, attorneys know what has to be covered |
| Makes the most sense for | Simple inventions or a tight budget | Complex inventions, or anything tied to funding or licensing |
None of this is legal advice, just a general walkthrough of how the process works. Patent strategy really does depend on your specific invention and what you’re trying to accomplish with it, so it’s worth a conversation with a registered patent attorney or agent, especially if the invention is complicated or investors are involved.
Frequently Asked Questions
Do I actually need a patent attorney to file a provisional application?
No. You’re allowed to file it yourself directly with the USPTO. A lot of inventors still bring in an attorney anyway, mainly to make sure the description is strong enough to hold up when the nonprovisional application comes along.
How long does the filing itself take?
Once your description and any drawings are ready, submitting through Patent Center usually takes under an hour. Getting the description right in the first place is the part that eats up time, often days or weeks depending on how complex the invention is.
Can I go back and add something to my provisional application after I file it?
Not really. You can fix formatting issues, but you can’t add new material. If you come up with a meaningful improvement afterward, the better move is filing a second provisional application that covers it.
What happens if I let the 12 months pass without filing a nonprovisional application?
The provisional application goes abandoned automatically, and you lose the priority date that came with it. There’s a narrow petition process for restoring it in cases of unintentional delay, but it costs extra and isn’t guaranteed to work.
Is it okay to file multiple provisional applications for the same invention?
Yes, that’s actually pretty common. Inventors often file one provisional, keep developing the idea, then file more as they go, eventually rolling everything into a single nonprovisional application as long as each one falls within 12 months of the earliest filing they’re relying on.
Filing a provisional application on your own isn’t complicated once you know what’s expected of you. The hard part is resisting the urge to rush the description. Take that seriously, file through Patent Center, pay the fee that matches your entity size, and keep an eye on that 12-month deadline from the moment you get your filing receipt.