What Is the Lifespan of a Patent?

By Tom Streissguth

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.


In order to register a patent, you must file paperwork with the USPTO and submit a detailed explanation of your invention, which the government will place in the public record. The patent gives you the right to exploit the patent for a limited period of time. The duration of patents depends on several factors, including whether you have applied for a design or a utility patent and when you filed.

Design and Utility Patents

A design patent is concerned with the appearance of the invention, including the way it looks and how it is ornamented. A utility patent covers the use of the invention and how it functions. A utility patent currently lasts for 20 years (from the date of application), while a design patent has a lifespan of 14 years (from the date of approval). For patents granted before June 8, 1995, the term of patent is 20 years from the filing date or 17 years from the grant of patent by the patent office, whichever is later.

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Date of Utility Patents

For utility patents, the legal theory is that your rights to the invention date from the moment when you place it in the record – otherwise the bureaucratic delay in actually getting the patent approved would allow imitators to steal it. The USPTO can take years to approve a patent, and in the case of some products (such as pharmaceuticals), the approval process takes a substantial percentage of the patent life. For this reason, an invention labeled "patent pending" is still under legal protection.

Earlier Patents

During the patent life, you may make, sell and license your invention to whomever you wish. For a utility patent, you must pay an annual renewal fee to keep the patent valid; the maintenance fee is not required for design patents. You may give written permission (in the form of a contract) to another party to manufacture the invention or to offer it to the public while paying you a royalty or percentage of sales. You may sell the patent or assign rights to others, an action that does not affect the remaining length of the patent. You must enforce the patent on your own by bringing suit against anyone who violates it – neither the USPTO or any other government entity will not initiate such an action.

Extension of Patent

An important revision of federal patent law allowed certain patents applied for on or after May 28, 2000 an extended term, based on delays caused by the USPTO's registration process. Federal law states that an extension is allowable after a delay of four months from the payment of the issue fee to the actual issuance of the patent by the USPTO. The law and regulations governing extension of patent terms due to processing delays appear in 35 U.S.C. 154, accessible online.

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How Do I Patent My Idea?

A patent protects an inventor's right to produce the product he invented, preventing others from selling or using the product. Federal law provides patents as a way to encourage innovation by giving inventors ownership over their own ideas. Since patents can only be granted by the U.S. Patent and Trademark Office, you must apply through that office before you can receive your patent.

What Happens When You Violate a Patent?

Patent rights are so important the founding fathers mentioned them in the U.S. Constitution. This respect for patent rights encourages companies to develop new technologies because the courts may punish those who violate those rights. Such punishment is commensurate with the damages suffered by the owner of the patent.

Can You Get a Patent for an Idea?

You cannot patent an idea alone. If you develop the specifics of your idea, however, you might be able to patent it. A patent grants you a temporary legal monopoly on the right to use and profit from your invention. You may sell your patent outright or simply license the use of your invention. After your patent expires, anyone may use and profit from your invention.

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