How Long is a Patent Good for?

In the United States, design patents last for 15 years from the grant date while utility and plant patents generally last for 20 years from the application date, provided that any required maintenance fees are paid. This varies depending on the type of patent, country, and current laws so if you’re seeking to protect your intellectual property, understanding the lifespan of a patent is crucial.

The Life Cycle of a Patent

A patent goes through different stages from its conception to its expiration. Let’s go through each one of these phases:


During this phase, the inventor conceives the invention and starts developing the idea. Thorough documentation of the entire development process is crucial as it helps in establishing the timeline of the invention and provides evidence of its originality and uniqueness.

Patentability Search

Before proceeding with the patent application, a patentability search is conducted to determine if the invention is new and non-obvious compared to existing prior art. This search helps identify any existing patents or publicly available information that might affect the novelty and non-obviousness of the invention.

Patent Drafting

Once the patentability search is completed, the next step is to draft the patent application. This involves creating a detailed description of the invention, including how it works, its components, and any specific embodiments. Additionally, the patent application includes claims that define the scope of protection sought for the invention. The claims are crucial as they determine the boundaries of what the patent will cover.

Patent Filing

After the patent application is drafted, it is filed with the appropriate patent office, such as the United States Patent and Trademark Office (USPTO) in the United States. Filing establishes the priority date, which is essential for determining the order of precedence if multiple inventors claim a similar invention.

Examination Process

Once the patent application is filed, it goes through an examination process at the patent office. A patent examiner reviews the application and checks for compliance with patent requirements, including novelty, non-obviousness, and sufficiency of disclosure. The examiner may issue rejections and objections to some or all of the claims, which will require the applicant to revise the claims and provide arguments in support of patentability.

Patent Grant

If the patent office is satisfied with the amended claims and the application meets all the requirements, the patent is granted. This means that the inventor is now the legal owner of the patent, and they have the exclusive right to make, use, and sell the invention for the duration of the patent term.


In some jurisdictions, patent holders must pay periodic maintenance fees to keep their patents in force. These fees are typically due at regular intervals throughout the patent’s term. Failure to pay these fees can result in the patent becoming abandoned or expired.


If the patent holder suspects that someone is infringing on their patented invention, they have the right to enforce their patent rights in court. This involves filing a patent infringement lawsuit against the alleged infringer, seeking remedies such as damages or injunctions to stop the unauthorized use of the invention.


Patents have a limited term of protection, which varies depending on the type of patent and the jurisdiction. In the United States, utility and plant patents have a term of 20 years from the filing date, while design patents have a term of 15 years. Once the patent term expires, the invention becomes part of the public domain, and anyone can use, make, or sell the invention without seeking permission from the former patent holder.

Extension or Supplementary Protection Certificates (SPCs)

In certain industries, such as pharmaceuticals and plant protection products, there may be provisions for extending the life of a patent beyond its original term. In the European Union and some other countries, Supplementary Protection Certificates (SPCs) can be granted to compensate for the time lost during regulatory approval processes. SPCs can extend the patent protection for up to five years, allowing the patent holder to enjoy exclusive rights for an extended period.

Patent Expiration Durations for Different Types of Patents

Patent protection comes to an end upon patent expiration. Identifying the expiration date depends on the patent type and filing date. Below are the common expiration dates for various types of patents:

  • Utility patents filed before June 8, 1995: 20 years from the filing date or 17 years from the issuance date, whichever is longer.
  • Utility patents filed on or after June 8, 1995: 20 years from the filing date.
  • Design patents: 14 years from the issuance date (issued for ornamental designs of functional items).
  • Plant patents: 17 years from the issuance date (issued for fruits, seeds, and plants).

Pathways to Patent Expiration or Invalidation

If an owner fails to pay the required maintenance fees to the U.S. Patent and Trademark Office (USPTO), a patent can expire. This often occurs when attempts to commercially exploit the invention have been unsuccessful, and the owner decides not to invest further in it.

To illustrate, consider an inventor who develops a unique product to license it to a third party for manufacturing and distribution. However, after failing to find interested companies, the inventor gives up on the idea and starts a new project. If the inventor neglects to pay the maintenance fees, patent protection will be lost.

Besides non-payment, a patent can also be invalidated if it is proven to be invalid due to reasons like insufficient patent application or fraudulent behavior during the application process. Fraud can involve lying or withholding information about prior art that would have prevented the patent’s issuance.

Furthermore, engaging in illegal activities related to the patent, such as colluding with a patent licensee to prevent other companies from competing, can also lead to the patent’s invalidation.

When a patent expires or is invalidated, the invention described by the patent enters the public domain. 

This means that anyone can use the invention without needing permission from the original patent owner. Valuable inventions like the foundational technologies of television and personal computers are examples of innovations that are no longer protected by active patents.

Legal Implications of Patent Expiration

The expiration of a patent can have several legal implications for both the patent holder and the public. Here are some of the key legal implications of patent expiration:

Loss of Exclusive Rights

Upon expiration, the patent holder loses their exclusive rights to the patented invention. This means that the invention becomes part of the public domain, and anyone can use, manufacture, sell, or import the technology without needing permission or paying royalties to the former patent holder.

End of Patent Enforcement

When the patent expires, the patent holder can no longer enforce their patent rights against others for infringement. Any unauthorized use or exploitation of the patented technology that occurs after the expiration date would not be subject to patent infringement claims.

Competitors’ Freedom to Operate

With the patent no longer in force, competitors are free to enter the market and offer similar products or technologies without the risk of infringing on the expired patent. This can lead to increased competition and potentially lower prices for consumers.

Licensing Opportunities

While the patent holder loses exclusive rights after expiration, they can still potentially capitalize on the invention’s market value by offering licenses to others who may wish to use the technology. Licensing agreements can be negotiated to allow others to use the invention for a fee or royalty, generating revenue for the patent holder even after the patent has expired.

Innovation and Follow-On Inventions

The expiration of a patent can stimulate further innovation and the development of follow-on inventions. Once the patent is no longer in force, other inventors and companies may build upon the expired technology, leading to new advancements and discoveries.

Importance of Trade Secrets

During the patent term, the patent holder may have enforced their patent rights against potential infringers. After expiration, such legal actions are no longer possible for the expired patent. Any ongoing patent litigation based on the expired patent would become moot.

International Considerations

Patents are territorial, meaning they are only valid in the countries where they are granted. Each country has its own patent laws and durations, and the expiration of a patent in one country may not necessarily affect its validity in others.

Potential Patent Term Extensions

In some cases, certain industries, like pharmaceuticals, may be eligible for patent term extensions, such as Supplementary Protection Certificates (SPCs) in the European Union. These extensions can prolong the effective life of a patent beyond its original expiration date under specific circumstances.

Gray Area and Continuation Applications

Sometimes, patent holders pursue continuation applications or other intellectual property strategies to maintain some level of protection or extend their patent rights beyond the original expiration date. These strategies can create legal complexities and uncertainties surrounding the scope of protection.


Here are responses to frequently asked questions concerning patents:

What is a patent search, and why is it essential?

A patent search is a thorough examination of existing patents and published applications to determine if your invention is novel and non-obvious. It helps you assess the likelihood of obtaining a patent and identify any existing inventions similar to yours. 

Conducting a patent search before filing your application can save time and money by avoiding unnecessary expenses on an invention that may not be eligible for patent protection.

How do I find a reliable patent attorney for my invention?

Finding a reliable patent attorney involves several steps. You can start by asking for recommendations from fellow inventors or entrepreneurs who have successfully obtained patents. 

Additionally, you can search online directories, and legal websites like LegalZoom, or contact local bar associations for a list of registered patent attorneys. When evaluating potential attorneys, consider their experience in your specific field of invention, client reviews, fees, and communication style.

How can I patent my idea for free?

While patents themselves are not granted for free, there are cost-effective ways to pursue a patent. One option is to file a provisional patent application, which provides temporary protection at a lower cost than a regular patent application

What is a patent attorney, and do I need one to file a patent?

A patent attorney is a legal professional with expertise in intellectual property law, particularly patents. They can help inventors navigate the complex patent application process, draft patent claims, and ensure all legal requirements are met. While it’s not mandatory to hire a patent attorney to file a patent, their knowledge and experience can significantly increase the chances of a successful application and protect your intellectual property rights effectively.

Josh Fechter
Josh is the founder of The Product Company.