Provisional patent applications, and what "patent pending" actually buys you

The name is the first problem. 35 U.S.C. § 111(b) creates a provisional *application*, not a provisional patent. The office takes it in, numbers it, and never looks at it. It is not examined, it cannot issue, and nobody can infringe it. Twelve months later it is abandoned by operation of law and cannot be revived. Its whole value is a date — and the real question is how much of your invention that date covers.

What "patent pending" is, and what it is not

Once a provisional is on file you may lawfully mark your product "patent pending". That is not merely a marketing convention. 35 U.S.C. § 292 makes it an offence to use "patent applied for", "patent pending" or similar wording when no application has been made, or when one was made but is no longer pending, if done to deceive the public. Since the America Invents Act, only the United States may sue for the statutory penalty; anyone suffering competitive injury from false marking may sue for damages.

The label carries no right to stop anyone. The only pre-grant remedy is the reasonable royalty under § 154(d), and it needs three things a provisional cannot supply: a published application, actual notice to the infringer, and claims in the issued patent substantially identical to those published. Provisionals are expressly excluded from eighteen-month publication by § 122(b)(2)(A)(iii), and have no claims at all. During the pending year you may say the words and nothing more.

A thin provisional buys a date it cannot hold

This is the part that costs people patents. § 119(e)(1) gives the later non-provisional the benefit of the provisional's date only where the invention it claims is disclosed in the provisional "in the manner provided by section 112(a)": a written description of the invention and of the manner of making and using it, in terms exact enough to enable a skilled person to do so. Best mode is excused; written description and enablement are not.

The test is applied claim by claim, and a document can pass for one claim and fail for the next. In New Railhead Mfg. v. Vermeer Mfg. Co. (Fed. Cir. 2002) the patentee filed a provisional on a drill bit, then claimed a bit angled with respect to its sonde housing. The provisional never described the angle. The claims therefore took the November 1997 utility date rather than the February 1997 provisional, which put the inventor's own mid-1996 sales more than a year before the effective date, and the patent fell to the on-sale bar. It is a pre-AIA case, but the mechanism is unchanged: lose the priority date and everything in the gap becomes prior art.

What actually goes in the file

The formal requirements are almost nothing: a specification meeting § 112(a), drawings where needed to understand the invention, a cover sheet identifying the filing as provisional, and the fee. No claim, oath or declaration is required, and information disclosure statements are not accepted. Design inventions cannot use the route, and a provisional cannot itself claim benefit of anything earlier.

That minimalism is the trap. The requirements for filing are not the requirements for support, and only the second decides anything. Write the provisional as though it were the real application: alternatives, ranges, materials, dimensions, the variants you have already ruled out. Anything you leave for the version you will write next year is not covered by this year's date.

The twelve months are statutory, and there is no extension

Section 111(b)(5) says the provisional is regarded as abandoned twelve months after its filing date and is not subject to revival after that period. The office states plainly that the pendency period cannot be extended. There is one piece of slack, in § 119(e)(1): if the twelve-month day falls on a Saturday, Sunday or a federal holiday within the District of Columbia, the period runs to the next business day.

Two further dates catch people who did file in time. The benefit claim is a separate act: the non-provisional must contain a specific reference to the provisional in its application data sheet, due within four months of the non-provisional filing or sixteen months of the provisional, whichever is later. And if the twelve months are genuinely missed, a non-provisional filed within a further two months can still restore the benefit by a grantable petition stating the delay was unintentional. It is a rescue, not a schedule.

The pending year is not neutral ground

People treat the twelve months as a safe window in which to demo, pitch and sell. In the United States it partly is: § 102(b)(1) removes from prior art any disclosure made a year or less before the effective filing date where it came from the inventor, or from someone who got it from the inventor. But that grace period is measured from the effective filing date, which is the provisional's date only for claims the provisional supports. A claim that loses priority loses its grace period at the same moment — which is precisely how the inventor in New Railhead was defeated by his own sales.

Outside the United States there is usually no equivalent. Most systems apply absolute novelty, so a disclosure before your filing date can bar protection there though it would be forgiven at home. File first and talk afterwards, and put unavoidable conversations under a confidentiality agreement — which keeps the material out of "available to the public" and preserves the trade secret position for anything you decide not to claim.

The costs that are not the filing fee

The provisional filing fee is set annually in three tiers — undiscounted, small entity and micro entity — so take the current figure from the USPTO fee schedule, not from any article, this one included. It is also the smallest number here. The real cost is the time of whoever writes a specification good enough to support claims drafted a year later.

The term arithmetic runs in your favour. § 154(a)(2) measures the twenty-year term from the application's filing date, or from the earliest application referenced under §§ 120, 121, 365(c) or 386(c). Section 119(e) is not on that list, so the provisional year does not come out of your patent term. There is one way to lose it: converting the provisional itself under 37 CFR 1.53(c)(3) makes the term run from at least the provisional's date. Filing a fresh non-provisional claiming benefit costs the same and keeps the year.

Do the ownership housekeeping in the same week. If a contractor, a co-founder or a machine shop contributed to what you are describing, those rights need assigning before anyone raises money on them — see IP assignment agreements, the assignment template and the invention terms in an independent contractor agreement. And a patent licence granted on a pending application should say what happens if it never issues.

When it is worth filing, and when it is not

A provisional is worth filing when you can describe the invention fully today and have a real reason to defer the cost of a full application by a year: a round to close, a market to test, a foreign filing decision you cannot yet make. It is a poor purchase when the description would be a paragraph about a concept, because a paragraph will not support a claim. The honest alternatives are to keep working and file once, or to stay confidential — and if what you want to protect is a name rather than a mechanism, the three regimes are not interchangeable.

A provisional application is a photograph of what you understood on one day. Cheap is the point — but an underexposed photograph is worse than none, because it produces the confident belief that the idea is protected while the clock runs down. Judge the filing by one question: if a rival filed the same invention tomorrow, does your document describe enough of it to win?