A provisional is a twelve-month option on a filing date. What a strong one contains, the month-six money call, rolling vs. concatenated filings, and the plan.
A provisional patent application is a twelve-month option on a filing date, and it is worth exactly what it teaches. The U.S. will not sell you more time, so the playbook is short: write a provisional that could support the claims you will actually want, make the money decision at month six, and use the year to find out whether the invention deserves the $15,000 to $30,000 a real patent costs.
A provisional is a U.S. filing that locks in a priority date. The USPTO does not examine it, does not require claims or an oath, and will never turn it into a patent on its own. It requires a written description meeting 35 U.S.C. 112(a), drawings where needed, a cover sheet, and a fee of $325, or $130 for a small entity and $65 for a micro entity. In return you get to say patent pending for twelve months.
Then it ends. The statute says a provisional is abandoned twelve months after filing and is not subject to revival after that. There is no extension. The one escape hatch is narrow: a nonprovisional filed within two months after the deadline, plus a petition under 37 CFR 1.78(b) stating the delay was unintentional, can restore the benefit, for a petition fee that currently runs $2,260, or $904 for a small entity. That is a rescue for a missed calendar entry. Do not plan around it.
One more thing founders get wrong: “converting” a provisional almost always means filing a new nonprovisional that claims its date. A literal conversion under 37 CFR 1.53(c)(3) exists, but it starts the 20-year term from the provisional’s filing date, and the MPEP itself says to file the new application instead.
The USPTO’s preliminary count for fiscal 2025 is 188,459 provisional filings, up from 149,203 the year before, the largest one-year jump in that table, which runs back to 2007. Cheap options are easy to buy, and the rest of the year is where the quality of the purchase shows up.
The rule that matters is in MPEP 2152.01: the effective filing date is determined claim by claim, not application by application. Each claim in your eventual patent gets the provisional’s date only if the provisional describes that claim’s invention the way 112(a) requires. Claims it does not support get the later filing date, and, absent a grace-period exception, everything published, sold, or demoed in between becomes prior art against them. Including your own launch.
The case to know is New Railhead v. Vermeer (Fed. Cir. 2002). The patent claimed a horizontal drilling bit angled relative to its housing; the provisional showed the parts but never described the angle. Without the provisional’s date, the inventors’ own 1996 sales of the bit, more than a year before the utility filing, invalidated the claims. Real invention, real product, and the patent died on a missing sentence.
So we write the provisional backward from the claims. Before anyone drafts a specification, list the claims you would want in the granted patent: the broadest version of the idea, the version a competitor would copy first, and the fallbacks you could live with. Then make sure the specification supports every element of each one. A provisional built this way looks like a patent: title, abstract, figures with reference numerals, a description someone skilled in the field could build from, the variations and ranges you can already see, and at least one claim even though the USPTO does not ask for one. The claim forces the discipline and gives you something to compare against at month eleven.
Patentext’s list of first-filing mistakes puts claim-scope strategy last on its list. We would put it first, because it decides everything else in the document.
A provisional holds the date for what it teaches. Not for what you meant, and not for what you built the following spring.
Tradespace’s 2026 guide argues that flat-fee managed filing at $1,000 to $3,000 is now the right default for provisionals, with hourly attorney drafting at $2,500 to $6,000 reserved for inventions that need specialized expertise. We would flip that for the one invention your company cannot afford to lose. The scarce input is claim-forward judgment about what to describe, and a flat fee usually buys formatting rather than judgment.
The version we recommend splits the work. Write the technical disclosure yourself, in depth, with every variation and failure mode you know about; in our experience no attorney extracts all of that in a two-hour call. Then pay a patent attorney for the hours that matter: the claim outline, the gap check against your disclosure, and the call on what stays out as a trade secret (a legal call; we are a strategy firm, not a law firm). Our own range for a professionally drafted provisional is $2,000 to $6,000; arriving with a full disclosure moves you toward the low end, and toward a document that will hold its date.
The middle path, a thin draft plus a request that an attorney take a quick look, does not work. BitLaw’s provisional guide explains why attorneys decline: adequacy cannot be judged without the claims and the prior art, and a proper review costs about what a full application costs. Flat-fee filings are a fine tool for the secondary variants you want on file cheaply, and the wrong tool for the core.
If you are not sure which bucket you are in, our six-question provisional readiness check asks what an attorney would ask before you spend anything.
Every guide says set reminders (Tradespace picks six, nine, and eleven months; Patentext says see a professional at least a month out). Fine, but a reminder is not a decision. We treat month six as the point where the CFO, or the founder wearing that hat, re-forecasts the whole cost of going forward and makes the go, defer, or drop call.
The forecast is not complicated. Drafting the nonprovisional commonly runs $8,000 to $15,000 or more, USPTO filing, search, and examination fees total $2,000, $800, or $400 by entity size, office action responses land at $1,500 to $3,000 or more each, and a U.S. patent through grant commonly ends at $15,000 to $30,000 or more. If foreign coverage is on the table, the PCT decision lands at the same mark, with bigger bills later. Put those numbers next to your runway at month six and the answer is usually obvious. At month eleven it is an emergency purchase against a fundraising deadline.
Bring an actual number to the month-six meeting. Run the Patent Cost Calculator with only the countries you would honestly file in, and put the total on the agenda.
If the answer is drop, decide what happens to the disclosure. If nobody outside has seen it, it can go back to being a trade secret. If they have, consider publishing it, which turns it into prior art against everyone, including your future self; sometimes that is exactly the point. Talk that one through with counsel first.
The rolling provisional comes up most: at month eleven, refile the same material as a new provisional and buy another year of patent pending. What you lose is the date. Gene Quinn at IPWatchdog argued in 2021 that refiling is a bad trade, and he is right about the mechanism: a refile resets nothing that happened in between. Your demo day, your customer pilot, and every competitor publication from the last eleven months can now be prior art against the new date. The U.S. grace period runs one year back from the effective filing date, so a disclosure that was safely inside the window under the first provisional can be outside it under the second.
Foreign rights are worse, and this is the limit most founders never hear. Under Paris Convention Article 4C(4), a refiled application counts as your first filing for priority only if the earlier one was withdrawn or abandoned without being published, without leaving any rights outstanding, and without ever having been used for a priority claim. Mintz’s 2016 note on the article recommends expressly abandoning the first provisional before refiling, because a lingering right can poison the second one’s priority claim. Rolling makes sense in one situation: nothing has been disclosed, no foreign filing is planned, and the money genuinely is not there yet. That describes fewer companies than think it does.
Concatenation is the tactic we like. As the design evolves during the year, file additional provisionals on the new material, each written with the same care as the first. Then, before the first one turns twelve months old, file one nonprovisional that claims the benefit of all of them. Each claim gets the date of the earliest provisional that supports it. Jason Amsel describes the same play for inventions whose long-term value is uncertain, and it is the honest version of rolling: new content gets a new date, and old content keeps the old one.
The trap is arithmetic. The twelve months run from the first provisional in the chain, not the last. A team that files in March, adds provisionals in July and November, and assumes the clock restarted in November has lost the March date, and with it the point. Done deliberately, concatenation is how you put several candidate ideas on file cheaply and convert only the ones the market responds to.
Here is what we ask founders to do with the year. We went through the post-filing checklist in detail on Invent Anything episode 72: Your Provisional Patent Is Filed: Now What?
Count the months. If you are past six with no conversion forecast, do it this week, with the calculator and your attorney’s quote side by side. If you are inside the last ninety days, get the attorney drafting now and start the claim chart yourself; you know the invention, and the gaps will show up faster than you expect.
If you are about to file, spend the extra two weeks and write it like the patent you want. The date is only worth what the document under it can hold.
Talk with our team if you want help turning a provisional, filed or not yet, into a filing plan with a number next to each decision.
Work with ipCapital Group
From invention to monetization, our team has guided 2,000+ engagements across the full IP lifecycle. Start with a free 30-minute discovery call.
Written by
Seth Cronin