Usually not. If you showed an invention in public more than a year ago, that showing now counts as prior art against your own patent application in the United States, and in Europe and the UK any public disclosure before filing does. You may still be able to patent a genuine improvement you haven’t disclosed, so it’s worth a short consultation with a patent attorney before you give up.
Disclosure: I’m Inna Hall, co-founder of TimeBinder, a tool that timestamps files. This is general information, not legal advice.
Table of Contents
The US one-year grace period
Under US law (35 U.S.C. 102), an invention isn’t new if it was described in a printed publication, in public use, on sale or “otherwise available to the public” before the effective filing date. There is one important exception for inventors: a disclosure made by the inventor no more than one year before filing doesn’t count against them.
So if you demonstrated a process at a science fair, a conference or on YouTube, you had 12 months from that day to file. After that window closes, your own demonstration is treated like anyone else’s publication. A science fair with public judging, press coverage or a published project summary will normally count as public.
Whether a particular event was really “public”, and exactly what it disclosed, can be argued. That question is worth paying an attorney for, because the details decide it.
Europe and the UK: no general grace period
The European Patent Office and the UK IPO apply “absolute novelty”: anything made available to the public anywhere before the filing date counts, including your own demonstration. The narrow exceptions (for example, evident abuse or display at certain officially recognised international exhibitions within six months) rarely help an individual inventor. Many other countries work the same way, which is why attorneys advise filing before any public showing.
What you can still do
- Write down exactly what was shown. Collect the poster, slides, videos and press articles from the event. What counts as prior art is only what was actually disclosed, not everything you knew.
- List what’s new since then. Better hardware, a new step, a different use, or a result you got later may be patentable on its own if it isn’t obvious from the earlier disclosure.
- Book a consultation. Many patent attorneys offer a short first meeting at low or no cost, and in the US some law school clinics and the USPTO Pro Bono Program help inventors with limited funds.
- Consider other routes. If patenting is closed, you can still publish, build a product, or rely on being first to market. Your earlier public demonstration also stops anyone else from patenting that same process.
How to protect the next idea
- Keep dated records as you work: notebooks, sketches, test data and code.
- Don’t present, publish or pitch the invention until you’ve spoken to an attorney or filed something.
- In the US, a provisional application gives you a filing date for 12 months at a modest fee.
- Use NDAs when you need to show the idea to a manufacturer or partner before filing.
Our guide to proving you invented something first covers record-keeping in more detail.
What a timestamp does, and doesn’t, do
A timestamp is not a patent and it doesn’t reserve any rights. The US has been “first inventor to file” since 2013, so being able to show you had the idea first won’t beat someone who files before you.
What dated records can do is show what you had and when: useful in a dispute with a collaborator, in a derivation proceeding, or to show your notes predate someone else’s disclosure. With TimeBinder invention records timestamping, your lab notes, CAD files or test data are hashed in your browser (they’re never uploaded), the hash is anchored to the Bitcoin blockchain, and you get a Proof of Time Certificate. It shows a file existed no later than that date and still matches its fingerprint. It does not show who made it, and it never counts as a public disclosure, because nobody can see the content.
The free plan includes 1 Token a month, and one TimeBind covers up to 10 files. See pricing for the paid plans.
Frequently Asked Questions
Does showing an invention to a few friends count as public disclosure?
Usually not, if it was in confidence. A public event, a website, a published paper or a sale usually does count. An attorney can tell you where your case falls.
If I can’t patent it, can someone else?
Not the same thing. Your public disclosure is prior art against everyone, so it also blocks others from patenting what you showed.
Is a timestamped file the same as a provisional patent?
No. A provisional application gives you a US filing date for priority. A timestamp only shows a file existed no later than a date; it doesn’t give you a filing date or any rights.
This article is general information, not legal advice. Sources were checked on 28 October 2026.
