How Long Is a Patent Valid?

By Grygor Scott

A patent is a governmental grant of a short-term monopoly to inventors. U.S. patent laws enable a patent holder to prevent others from making, using or selling the patented invention for a specific time period. How long a patent remains valid depends on the type of patent and other factors.

Acquiring a Patent

To receive a patent, an inventor must file a patent application with the U.S. Patent and Trademark Office. A patent examiner examines the application. If the application establishes that the invention satisfies the legal requirements for a patent, the examiner will approve the application. The Patent and Trademark Office then sends the inventor a patent certificate.

Determining the Effective Date

A patent’s term begins on the date that its application was filed with the Patent and Trademark Office. A patent’s effective date is the filing date rather than the approval date because extending an approved patent’s legal protections back to the filing date deters others from exploiting an invention while the inventor’s patent application is under review. In rare cases, a patent’s term starts after the filing date. The Patent and Trademark Office sometimes grants a patent holder a later effective date if there was an unusual delay in examining the patent application.

File a provisional application for patent online. Get Started Now

Utility and Plant Patent Term

U.S. law recognizes three different types of patents. Most patents protect new, useful machines, manufactured items, and processes. This type of patent is known as a utility patent. New, distinct varieties of plant life may also be patented. All utility and plant patents filed after June 8, 1995, have a term of 20 years. Patents filed before that date have a term of either 17 years from the date the patent was issued or 20 years from its earliest filing date, whichever results in the longer term.

Design Patent Term

The third type of patent is a design patent. It protects the distinct ornamental features of a manufactured item. These features may be a distinctive shape or a novel exterior design. Design patents have a term of 14 years.

Patent Expiration

A patent expires when its term ends. A patent may become invalid before its term ends if the patent owner fails to pay required maintenance fees to the Patent and Trademark Office. Maintenance fees are due in years three, seven and 11 of a patent’s term. The Patent and Trademark Office gives patent holders a six-month grace period to pay maintenance fees. A patent may also be invalidated when a court trying a patent infringement lawsuit rules that the patent fails to meet the legal requirements for patent approval.

File a provisional application for patent online. Get Started Now
Overturning a Patent


Related articles

What Happens When Someone Tries to Use a Patent That Has Expired?

While in effect, a patent offers the holder exclusive rights to his invention. But a patent can expire for two reasons: failure to pay maintenance fees or completion of the natural patent term. What happens when someone makes or uses a patented invention that has expired depends upon why the patent expired.

What Do I Do if My Patent Lapses?

Patents provide inventors with exclusive rights to make, use or sell their inventions or processes. Patent rights originated in Article 1, Section 8 of the U.S. Constitution and aim to promote scientific progress by granting rights to inventors for a period of time. The Patent and Trademark Office, or USPTO, administers patents in the United States. Most patents continue for up to 20 years but will lapse if regular maintenance payments are not paid. If your patent lapses, you have a limited period of time to petition for its revival.

What Does Patent Mean?

A patent is a legal monopoly on the use and benefit of a unique invention. Patent rights are granted by national governments after a lengthy application and examination process. The patent holder may be the inventor or, as in the case of a work for hire, the inventor’s employer. In the U.S., patents are granted by the U.S. Patent and Trademark Office.

Start here. LegalZoom. Legal help is here. LLCs. Corporations. Patents. Attorney help.

Related articles

How to Calculate Patent Expiration

In the U.S., patent protections generally stay in force for twenty years, but the date on which this protection begins ...

Elements of a Patent

A patent gives an inventor the legal right to prevent others from making, using or selling the inventor’s new device, ...

What If a Full Patent Is Not Approved and You Have a Provisional Patent?

In the United States, intellectual property rights are protected by the Constitution. Creative individuals are allowed ...

Can You Ever Lose a Patent?

Patents provide legal protection for your unique ideas translated into inventions. This exclusive right to put an ...

Browse by category
Ready to Begin? GET STARTED