I Haven’t Filed a Patent Application Yet — What Deadlines Should I Be Aware of?

This is one of the most urgent questions I hear from inventors, and for good reason — missing a patent deadline can permanently destroy your ability to get a patent. Here’s what you need to know, and what to do if you’re worried about timing.

The U.S. One-Year Grace Period

The United States gives inventors a one-year grace period from the date of first public disclosure or sale to file a patent application. That means if you’ve publicly disclosed your invention — shown it at a trade show, sold it, offered it for sale, published about it, or described it in any public forum — you have one year from that date to file before your U.S. patent rights are permanently lost.

This grace period is a safety net, not an invitation to wait. Here’s why:

• The clock starts the moment you disclose — not when you realize it. If you showed your invention to a potential customer six months ago without filing, you may have six months left, not a full year.
• The experimental use exception is narrow. There is a limited exception for experimental use — testing the invention in a way that necessarily exposes it to the public — but it’s strictly interpreted and not a reliable fallback.
• Any ambiguity about the disclosure date is a risk. If you’re not certain when your clock started, that uncertainty itself is a problem that needs to be resolved quickly.

The Most Important Rule: Engrave the Date

If you have disclosed your invention publicly for any reason — a trade show, a sales conversation, a social media post, a published article — you should record that date immediately and treat it as a hard deadline. One year from that date is your last day to file a U.S. patent application. I recommend retaining me well in advance of that date so I can make sure your application is filed on time and filed correctly.

Foreign Patent Deadlines Are Much Stricter

If you have any interest in patent protection outside the United States, the deadlines are far less forgiving. Most foreign countries operate under an absolute novelty standard — meaning any public disclosure before filing permanently destroys your foreign patent rights, with no grace period at all.

There are two main pathways for preserving foreign rights after a U.S. filing:

• Paris Convention: You have 12 months from your U.S. filing date to file directly in individual foreign countries, claiming priority back to your U.S. filing date.
• PCT Application (Patent Cooperation Treaty): You have 12 months from your U.S. filing date to file a PCT application, which gives you up to 30 months from your priority date before you need to enter individual countries. This is the most common strategy for preserving foreign options while deferring cost.

The key takeaway: if you’ve publicly disclosed your invention and haven’t filed anything yet, every day you wait potentially forecloses foreign patent rights. The U.S. grace period does not protect you internationally.

What If You’re Not Sure Whether You’ve Disclosed?

This comes up more often than you might think. A conversation with a potential investor, a demonstration to a supplier, a post on LinkedIn — any of these could potentially start the clock depending on the circumstances. If you’re not sure whether something you’ve done counts as a public disclosure, that’s exactly the kind of question I can help you think through quickly.

What to Do Right Now

If you’re reading this page because you’re worried about a deadline, here’s what I recommend:

1. Write down every date when you disclosed, sold, offered for sale, or publicly described your invention in any way.
2. Contact me as soon as possible. A provisional patent application can be filed relatively quickly and will establish a priority date immediately, stopping the clock on your U.S. and foreign deadlines.
3. Don’t make any additional public disclosures until you’ve spoken with me.

Time is the one thing you can’t get back in patent law. Schedule a consultation today — the initial $250 fee is credited toward your work if you move forward, and we can often move quickly when timing is a concern.

Related Topics:

• Can I Tell Others About My Invention Before I File a Patent Application?
• How Do I Protect My Invention in Foreign Countries?
• What Does it Mean to Be “Patent Pending”?
• What is a Patent Search?
• What is a Provisional Patent Application?
• Should I File a Provisional Patent Application?