Provisional vs Non-Provisional Patent Application: Which Should You File?
What each application does, what it must contain, how it affects priority and patent term, and when filing a provisional first makes sense.
The Short Answer
A provisional application secures an early filing date for twelve months at low cost, but it is never examined and cannot become a patent on its own. A non-provisional application is examined and can issue as a patent. Most applicants file a provisional when the invention is still developing or budget is tight, then file a non-provisional that claims its benefit within twelve months.
At a Glance
| Provisional | Non-Provisional | |
|---|---|---|
| Examined by the USPTO | No | Yes |
| Claims required | No, although including some is good practice | Yes, at least one claim |
| Inventor oath or declaration | Not required | Required |
| Lifespan | Twelve months; cannot be extended except by limited restoration | Pending until it issues or is abandoned |
| Publication | Not published on its own; available once a published application or patent claims its benefit | Published about eighteen months from the earliest priority date unless a non-publication request applies |
| Effect on patent term | The twelve months do not count against the twenty-year term | Term runs twenty years from its filing date |
| Relative cost | Lower USPTO fees and usually lower drafting cost | Higher filing, search, and examination fees |
Two Different Jobs
A provisional patent application and a non-provisional application are not competing versions of the same filing. The provisional exists to establish a filing date. The non-provisional is the application the USPTO actually examines under patent prosecution and that can issue with enforceable claims. The question is usually not which one to file, but whether to file a provisional first.
What a Provisional Application Does
A provisional under 35 U.S.C. § 111(b) requires a specification that describes the invention, any drawings needed to understand it, a cover sheet, and the filing fee. It does not require claims or an inventor declaration, and the USPTO does not examine it.
The provisional remains pending for twelve months. To keep its benefit, the applicant must file a non-provisional application, or a PCT application, that claims priority to it within that period. If the twelve months pass unintentionally, 37 C.F.R. § 1.78 allows the benefit to be restored by petition if the later application is filed within fourteen months. After that, the provisional expires and its filing date is lost.
The Written Description Trap
A provisional gives priority only to the subject matter it actually describes. If the non-provisional claims a feature, embodiment, or range that the provisional does not support under the written description requirement of 35 U.S.C. § 112(a), those claims receive the later non-provisional filing date. Any prior art published in between, including the applicant's own product launch or conference talk, can then be cited against them.
This is why a thin provisional, such as a slide deck or a one-page summary, offers far less protection than it appears to. The provisional should describe the invention as completely as a non-provisional would, including alternatives and fallback positions.
What a Non-Provisional Application Does
A non-provisional under 35 U.S.C. § 111(a) contains the full specification, claims, drawings, an abstract, and the inventor declaration. It enters the examination queue, receives office actions, and can issue as a patent. It is also the application from which continuations and other family members descend.
Priority, Term, and Foreign Filing
Filing a provisional first has three consequences worth understanding:
- Priority date: The provisional's filing date becomes the effective date for supported claims, which matters under the first-inventor-to-file system
- Patent term: The twenty-year patent term runs from the non-provisional filing date, not the provisional date, so the provisional effectively adds up to a year of protection at the back end
- Foreign filing: A US provisional qualifies as a first filing under the Paris Convention, so the twelve-month Paris priority period for foreign or PCT filings runs from the provisional date
The last point is easy to miss. The foreign filing deadline and the non-provisional deadline fall on the same day, and both must be docketed.
When to File a Provisional First
A provisional is usually the right first step when:
- The invention is still being refined and further embodiments are expected within the year
- A public disclosure, sale, or offer is imminent and there is no time to prepare full claims
- Budget decisions about the invention will be made later, after market testing
- Several related improvements will be combined into one non-provisional at the twelve-month mark
Filing a non-provisional directly is usually better when the invention is mature, when examination should start as soon as possible, or when the applicant wants accelerated examination such as Track One. A provisional delays the start of examination by up to a year.
Common Mistakes
- Filing a provisional that omits embodiments later claimed, which forfeits the early date for those claims
- Missing the twelve-month deadline for foreign filing because only the US non-provisional was docketed
- Treating the provisional as confidential forever, when it becomes publicly available once a later application claiming its benefit is published
- Naming inventors carelessly; while the provisional does not require a declaration, inventorship must still be correct in the application that claims its benefit
Managing the Twelve-Month Window
The provisional period is one of the most consequential deadlines in a patent program, because missing it can cost both the US priority date and every foreign right. IP teams that file many provisionals track each one against its conversion and foreign filing dates and review the invention before the deadline, so the decision to convert, combine, or abandon is deliberate. ArcPrime's invention disclosure workflow ties each provisional to its source disclosure and conversion decision.
Frequently Asked Questions
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Can a provisional application become a patent?
No. A provisional is never examined and expires after twelve months. To obtain a patent, a non-provisional application claiming its benefit must be filed within that period.
Does a provisional application extend patent term?
Indirectly. The twenty-year term runs from the non-provisional filing date, so the up to twelve months the provisional was pending are not counted, while the provisional still provides the earlier priority date for supported claims.
What happens if I miss the twelve-month deadline?
If the delay was unintentional, the priority claim can be restored by petition under 37 C.F.R. 1.78 when the non-provisional is filed within fourteen months of the provisional. After that, the provisional date cannot be claimed.
Should a provisional application include claims?
Claims are not required, but drafting at least a few helps confirm that the specification supports the scope you will later seek and gives the provisional a clearer focus.
Can I claim priority to a US provisional in other countries?
Yes. A US provisional is a first filing under the Paris Convention, so foreign and PCT applications filed within twelve months of it can claim its date.
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