How to file a provisional patent application in 2026 (solo inventor)
A provisional gives you a filing date and 12 months of 'patent pending' for $65 (micro-entity). What to write, what to file, and what most solo inventors get wrong.
A provisional patent application (“provisional”) is the cheapest path to a filing date in the United States. For a micro-entity (most solo inventors) the USPTO fee is $65. You get “patent pending” status, a priority date the examiner will respect later, and 12 months to convert to a non-provisional. After that window it expires. This post is the shortest legitimate path to filing one in 2026.
What a provisional is — and isn't
A provisional is never examined. The USPTO files it, timestamps it, and then does nothing unless you follow up within 12 months. It grants no rights. What it does is establish priority: if you later file a non-provisional, claims that are fully supported by the provisional inherit its filing date.
“Fully supported” is load-bearing. If your provisional says “a method” and your non-provisional claims “a method with step X,” step X has to be enabled (“a person skilled in the art could make it”) in the provisional. Otherwise the priority date for those claims is the later filing date and you lose most of the protection.
What to write
The canonical provisional contains:
- Background — what exists, what's broken, why someone cares.
- Summary — what you're disclosing, in one paragraph.
- Detailed description — the embodiment(s). This is where enablement lives. Write how a competent engineer would build it without guessing.
- Drawings — every non-trivial provisional benefits from figures. They don't have to be patent-formatted yet; they have to be clear.
- (Optional) Claims — not required in a provisional, but they force you to articulate the boundary. Write at least one independent claim.
Don't bury the embodiment. The single most common provisional failure is writing 40 pages about why the field matters and one paragraph about the actual invention. Flip that ratio.
What to file
You file three things at the USPTO Patent Center:
- SB/16 — the cover sheet (inventor name, title, correspondence address).
- Specification — the document you wrote above, as a PDF.
- SB/15A (optional) — the micro-entity certification. If you qualify (income under ~$251K, no more than 4 prior applications), file this to unlock the $65 fee.
There is no ADS required for a provisional — that's for non-provisionals. The whole filing is typically two PDFs plus the fee.
The 12-month clock starts immediately
The day you file, a calendar timer starts. You have exactly 12 months to do one of three things:
- Convert to non-provisional — file a real application claiming priority to your provisional. This is what you want in most cases.
- File a PCT — international application claiming priority, if you care about non-US markets.
- Let it expire — sometimes the right call if the idea proves weak.
Missing the 12-month window doesn't just lose the priority date — if you publicly disclosed the invention in the meantime, you may have triggered a statutory bar against your own filing. Keep the disclosure confidential until the non-provisional is filed, or make sure the US one-year grace period is still intact.
The most common mistakes we see
- Filing without a prior-art search. If someone filed your idea last year, a provisional buys you nothing. Search first. (We do this for free.)
- Skipping drawings. If the invention has a physical or architectural component, drawings are load-bearing for enablement.
- Writing the provisional like a product spec. Don't. Write it like a novel method description — concrete, reproducible, bounded.
- Forgetting to inventory every embodiment. Anything you plan to claim later should be disclosed now. Add-on features you invent after filing won't inherit the priority date.
The fastest way to do this right
50search offers free prior-art search in beta. Drafting and portfolio management are coming soon, in beta, held pending legal and insurance review, and not for sale. Checkout is blocked. No automatic deadline reminders or filing-ready package is offered. Consult a registered patent practitioner before filing.
Not legal advice. For bar-sensitive questions (entity status, obligations to disclose), talk to a registered patent practitioner.
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