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.

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


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Overturning a Patent

A patent is a right to exclude others from making, using or selling an invention of yours. To be eligible for patent protection, the invention must incorporate original technology that has never been publicly released before. The U.S. Patent and Trademark Office, or USPTO, reserves the right to invalidate a patent even after it is granted, if it discovers that the patented technology is not original or that information about it was publicly released before the patent application was filed.

What Does Expired for Non-Payment Mean for Patents?

A patent is a right conferred by the government to intellectual property that gives the patent-holder sole authorization to sell, make or distribute the item. Patents in the United States can only be granted by the U.S. Patent and Trademark Office. Inventors and discoverers of new, useful, non-obvious inventions can patent their items, granting them sole rights to profit from and sell the item for a set period of time. The patent office also offers patents for plants and for designs. To retain a patent, you must pay patent maintenance fees to the patent and trademark office. If you do not pay these fees, your patent will expire.

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.

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