Should You File a Patent Application Before a Demo, Launch, or Talk?

Why public demos, launches, papers, and sales can affect patent rights, how the U.S. grace period works, and what to do before a disclosure deadline.

By , registered patent attorney. Published . 5 min read.

General information about patent law and practice, not legal advice about your situation. How these rules apply depends on the facts.

Often, yes. Companies that may want patent protection commonly file at least a well-prepared provisional application before they demo, launch, publish, or present an invention publicly. The United States provides a one-year grace period for certain disclosures by the inventor, but many other countries do not, and relying on the grace period carries risks even in the United States. Filing first generally keeps more options open. Whether a particular event affects a particular invention depends on the facts.

This guide covers what counts as a disclosure, how the grace period works, and what to do when a deadline is approaching.

What counts as a public disclosure

Under U.S. law, an invention can be blocked by prior art that was patented, described in a printed publication, in public use, on sale, or otherwise available to the public before the effective filing date (35 U.S.C. 102(a)(1)). In practice, many ordinary startup activities can qualify:

  • A conference talk, poster, or published slide deck
  • A paper, preprint, thesis, or technical blog post
  • A public demo, trade show, or demo day presentation
  • A product launch, public beta, or app store release
  • Source code in a public repository
  • A product video, website, or crowdfunding campaign that explains how it works
  • An offer to sell, or a sale, of a product embodying the invention

The question is generally whether the information became available to the public, or whether the invention was on sale, not whether anyone actually noticed.

Sales count, even confidential ones

Offers and sales deserve special attention. The Supreme Court held in Helsinn Healthcare S.A. v. Teva Pharmaceuticals USA, Inc., 586 U.S. 123 (2019), that a commercial sale to a third party who is required to keep the invention confidential can still place the invention “on sale” under the current statute. A confidential deal with a pilot customer is therefore not automatically safe. If you are negotiating pilot agreements or early sales of a product that embodies the invention, raise the timing with your patent attorney or agent before signing.

How the U.S. grace period works

Under 35 U.S.C. 102(b)(1), a disclosure made one year or less before the effective filing date is not prior art if it falls into one of two categories:

  • Inventor-originated disclosures. The inventor’s own disclosure, or one by someone who obtained the subject matter from the inventor. So a founder who presents an invention at a conference generally has up to one year to file a U.S. application without that presentation counting against them. The USPTO treats an inventor’s own sale or offer for sale the same way, so a sale within that year is also excused for U.S. purposes.
  • Later disclosures of the same subject matter. If the inventor publicly disclosed the subject matter first, a later disclosure of that same subject matter by someone else, within the year, is also excluded.

The grace period is real, but it has limits:

  • It protects against your own disclosure, not everyone else’s. A third party who independently publishes or files on similar technology is protected against only to the extent their disclosure covers the same subject matter you already disclosed publicly. Variations and improvements you did not disclose can still be prior art, and a third party’s earlier patent filing can raise separate issues. These rules turn on exactly what was disclosed, so they are not a reliable substitute for filing.
  • Sales are judged differently abroad. Even where the U.S. grace period excuses a sale, many other countries treat public use and some commercial activity as destroying novelty.
  • The one-year clock is strict. Missing it can bar U.S. protection for what was disclosed.
  • Proving what was disclosed and when can become an issue later, particularly for informal disclosures.

Most other countries are stricter

Many countries, including those in the European Patent Convention, generally require absolute novelty: a public disclosure anywhere before the filing date can defeat patentability. Some countries offer limited grace periods, often with conditions and formal requirements. If international protection may matter to your company, investors, or future acquirers, the safest assumption is that a public disclosure before filing can limit or eliminate protection outside the United States.

Confidential disclosures are different

Disclosures made under an obligation of confidentiality, such as discussions with a contract manufacturer under an NDA, generally do not make the invention available to the public. They are much safer than public disclosures, although sales and offers to sell remain a concern as described above.

In practice, not every audience will sign an NDA. Many investors decline to, which is one reason to keep pitch materials at the level of what the product does and why it matters, rather than how it works, until an application is on file.

What to do before a disclosure deadline

1. Put the date on the calendar early. Product launches, conference submissions, demo days, and paper deadlines are usually known weeks or months in advance. That lead time is what makes a careful filing possible.

2. File before the disclosure, not the same morning. A provisional application prepared in a rush can still help, but its value depends on what it describes. The benefit extends only to what the provisional actually discloses.

3. Make sure the filing covers what you will disclose. Compare the application with the talk, paper, demo, or launch materials. Anything shown publicly that is not described in the filing is exposed.

4. Describe more than you will show. Include alternatives, variations, and the details behind the demo. Later claims need support in the filing, and competitors will build on what they see.

5. Be careful with slide decks as provisional applications. Filing a presentation or paper as a provisional is better than filing nothing, but these documents rarely describe the invention in the depth needed to support strong claims.

6. Coordinate everyone who might disclose. Engineers submitting papers, marketing teams preparing launch materials, and sales teams talking to pilot customers can each trigger a disclosure. One person should know the filing plan.

If you have already disclosed

If the invention is already public, do not assume the opportunity is lost. Gather what was disclosed, when, where, and to whom, and talk to a patent attorney or agent promptly. The U.S. grace period may still be available, and later improvements that were not disclosed may still be protectable. Foreign options may be limited, and that is worth understanding before deciding how to proceed.

A practical takeaway

It helps to treat every planned demo, launch, publication, talk, pilot sale, and public code release as a potential patent deadline. Identifying those dates early, filing before the first of them where protection matters, and making sure the filing describes what will be shown generally helps keep U.S. and international options open. That protection is not automatic: it extends only to what the filing adequately describes, and foreign rights also depend on a timely, valid priority claim and each country’s rules. It is still far easier than trying to recover rights afterward.