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.

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.

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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.

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.

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Can You Ever Lose a Patent?

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How to Renew a Patent

Patents granted by the U.S. Patent and Trademark Office are designed to encourage discovery and invention by granting exclusive rights to reproduce or sell an invention or design for a period of time. You must pay maintenance fees to the U.S. Patent and Trademark Office to maintain your patent for the full period.

What Is the Lifespan of a Patent?

You’ve created something useful, and, hopefully, profitable, and now you want to protect your invention. An application to the United States Patent and Trademark Office will guard your right to make, distribute and sell your creation to the public. You can enforce a registered patent in a court of law and ask for damages for any infringement of your rights. However, patents don’t last forever, so you may need to plan accordingly.

Why Do Patents Expire?

A patent is an exclusive right to make use, sell and distribute an invention, extended to an inventor or his assignee. In the United States there are two distinct sorts of patents: utility and design. Utility patents have a term of 20 years that begins to run on the filing date of the pertinent application. Design patents have a term of only 14 years, but the term begins to run from the date of issue. A utility patent is a right to the way a particular invention works and is used. A design patent, on the other hand, is a right to the ornamental aspects of the article. Both types of patent may be granted on the same invention.

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