A provisional patent application is a lower-cost, lower-formality filing with the USPTO that secures a priority date for your invention and lets you legally use "patent pending" for twelve months — without claims, without an oath, and without examination. To file one, you prepare a written description detailed enough that someone skilled in your field could make and use the invention, add drawings, complete a cover sheet, pay a small government fee, and submit through the USPTO's electronic filing system. It is the standard first move for US inventors who want protection on the clock while they develop and validate. Here is how it works — educational information, not legal advice; Projects House is an engineering firm, and filing strategy belongs with a registered patent attorney or agent.

What a provisional application actually does — and does not do

A provisional is never examined and never becomes a patent by itself. What it gives you is a filing date: if you file a non-provisional application within twelve months that claims priority to it, your invention is judged against prior art as of the provisional's date. That matters enormously in the US first-inventor-to-file system, where the earlier filer generally wins. It also does not extend patent protection — if the twelve months pass without a non-provisional filing, the provisional simply expires and is never published. And a thin, vague provisional protects only what it actually describes: features you add later get the later date. The myth that mailing yourself a description accomplishes anything similar is dismantled in is a poor man's patent real?.

What your provisional must contain

  • A complete written description. How the invention is built, how it works, what it is made of, and the variations you foresee — enough that a person skilled in the field could make and use it. This "enablement" standard is the whole ballgame: your priority date only covers what you disclose.
  • Drawings. Informal is acceptable at this stage — labeled sketches, CAD renders, photos of a prototype — as long as they support the description.
  • Cover sheet and fee. The USPTO cover sheet identifies the inventors and title; the government fee is modest, with discounts that bring it under a hundred dollars for most individual inventors filing as micro entities.

No claims are required. But because the eventual patent's strength traces back to this document, many attorneys draft provisionals nearly as thoroughly as non-provisionals — a professionally prepared provisional typically costs in the low thousands of dollars, while a careful self-filing costs only the government fee.

How to file, step by step

  1. Document the invention fully — text, drawings, alternatives, and intended uses. If you have built a prototype, describe what testing taught you; real build details make stronger disclosures.
  2. Run a prior art search first. A few hours with the patent search basics can tell you whether filing is worth it and which features to emphasize as novel.
  3. Assemble the specification and drawings as PDFs, complete the provisional cover sheet, and file through the USPTO's Patent Center. Certify your entity size honestly — micro and small entity discounts have eligibility rules.
  4. Save your filing receipt. The application number and date are your proof of priority. You may now mark the product "patent pending."
  5. Calendar the twelve-month deadline immediately. It is not extendable in the ordinary course, and missing it forfeits the priority date.

Using the twelve months well

The provisional buys you a year to do the things that decide whether full patent spend is justified: build and test prototypes, validate demand, pitch licensees from a protected position (see selling your invention), and raise funds. If the invention evolves meaningfully during the year, you can file additional provisionals covering the improvements and claim priority to all of them. Before the deadline, decide: file the non-provisional (the road described in how to patent an idea, with budgets in how much does a patent cost), refile a new provisional and accept the later date, or let it lapse and keep the idea as a trade secret.

Build the disclosure that makes your provisional strong

The best provisionals are written from real engineering: CAD models, working prototypes, and test results produce disclosures that hold up years later. Projects House develops inventions to exactly that level — documented, tested, manufacturable — giving you and your patent professional solid material to file on. Tell us about your invention through the contact form; the conversation is free and confidential.