When do patents expire?

A patent is considered expired when its legal protection ends, either because its maximum duration has passed or the required patent maintenance (or patent renewal) fees were not paid. Once a patent expires, the owner can no longer stop others from using, making, or selling the invention.

In most countries, patents last 20 years from the filing date.

However, the patent can expire earlier if:

  • The required patent renewal fees are not paid on time
  • The owner voluntarily abandons the patent.


After a patent expires, the invention enters the public domain, meaning anyone can use it freely.

When Do Patents Expire? A Quick Overview

Read more about...

How to patent a logo?
You can’t patent a logo, but you can protect it with a trademark. Learn how to legally protect your logo.
Read Next
What does "patented" mean?
“Patented” means a jurisdiction has granted exclusive rights to an inventor. Learn what a patented invention is and what rights it gives.
Read Next
What are patent claims?
Patent claims define the legal scope of an invention. Learn what they are and why they matter in patent applications.
Read Next