How long does a patent last depends first on whether it is a utility, design, or plant patent. Filing history, maintenance fees, term adjustments, regulatory extensions, and older patent rules can also affect the actual expiration date.
Key Takeaways
- Most U.S. utility and plant patents have a maximum term of 20 years measured from the applicable filing date.
- A U.S. design patent generally lasts 15 years from its grant date if its application was filed on or after May 13, 2015.
- Utility patent maintenance fees keep an eligible patent in force. They do not renew it beyond its maximum term.
- Patent Term Adjustment may compensate for certain USPTO delays, while Patent Term Extension may apply to qualifying regulated products.
- A patent's filing history, terminal disclaimers, maintenance status, and ownership records can complicate an expiration calculation.
- After patent protection ends, the patent's claims generally no longer prevent others from using the disclosed invention, although other patents or intellectual property rights may still apply.
How Long Does a Patent Last in the United States?
The standard U.S. term depends on the patent type. A utility patent generally lasts 20 years from the earliest applicable nonprovisional filing date. That date may come from a parent application or an international application in the patent's priority chain. The patent cannot normally be enforced until the USPTO grants it, so the practical period of enforceable rights is usually shorter than 20 years.
A plant patent also generally lasts 20 years from the applicable filing date. A design patent follows a different rule because it protects a product's ornamental appearance rather than its functional operation. For applications filed on or after May 13, 2015, a design patent lasts 15 years from its grant date. Earlier design applications generally received a 14-year term from grant.
| U.S. Patent Type | General Term | Term Measured From | Maintenance Fees |
|---|---|---|---|
| Utility patent | 20 years | Earliest applicable nonprovisional filing date | Yes |
| Design patent | 15 years for applications filed on or after May 13, 2015 | Patent grant date | No |
| Plant patent | 20 years | Applicable filing date | No |
These are general maximum terms, not guarantees that every patent remains enforceable for the entire period. A utility patent can expire early if required maintenance fees are not paid. A terminal disclaimer can tie its expiration to an earlier related patent. A court or the USPTO may also determine that claims are invalid or unenforceable.
Special transitional rules can apply to utility and plant patents associated with applications filed before June 8, 1995. If you are reviewing an older patent, do not rely on the standard 20-year calculation without examining its filing and issuance history. For a deeper type-specific explanation, see how the utility patent term is calculated and how a design patent term differs.
How to Calculate a Specific Patent's Expiration Date
Start by identifying the patent type. For a design patent, the grant date is usually the central date. For a utility or plant patent, review the full application history rather than simply adding 20 years to the issue date shown on the patent.
- Confirm the patent type. Utility, design, and plant patents use different starting points and fee rules.
- Find the relevant application dates. Review the patent's front page and related application data for parent, continuation, divisional, international, and priority claims.
- Identify the controlling filing date. A modern utility patent's term is generally measured from the earliest qualifying nonprovisional filing date in the chain. A provisional application's date does not itself start the statutory 20-year term, although it can establish priority and create important filing deadlines.
- Add the standard term. Add 20 years for a modern utility or plant patent, or measure the applicable design patent period from grant.
- Check for changes. Review Patent Term Adjustment, Patent Term Extension, terminal disclaimers, certificates, reexamination history, and other official record entries.
- Verify maintenance status. A utility patent may have lapsed before its calculated maximum expiration date.
You can review application records through the USPTO's Patent Center. The USPTO's maintenance fee system can help you check fee status for patents subject to those payments. These official records provide a free starting point, but an entry may require legal interpretation. For example, a related application's filing date may control even when a later filing date appears more prominently.
Do not confuse a provisional application, a published application, or patent-pending status with an issued patent. An application does not provide the same enforceable rights as a granted patent. The time an application remains pending also varies, as explained in this overview of how long patent-pending status can last.
Maintenance Fees and Early Patent Expiration
U.S. utility patent owners generally must pay maintenance fees at 3.5, 7.5, and 11.5 years after the patent is granted. The USPTO provides payment windows and may require a surcharge for a payment made after the ordinary due date. Because instructions and fees can change, check the USPTO's current requirements before paying.
Maintenance fees do not buy a new patent term. They keep an eligible utility patent in force during its existing term. Even if every payment is made, the patent normally expires at the end of its statutory term, subject to any valid adjustment or extension. Calling these payments renewal fees can create the mistaken impression that an owner can extend a patent indefinitely.
Design and plant patents do not require maintenance fees. A design patent remains in force through its applicable term without periodic USPTO payments, assuming no other legal issue ends or limits the rights. A plant patent likewise has no maintenance fee schedule.
If a utility patent's required fee is not paid, the patent can expire before its maximum term. The USPTO has procedures under which an owner may seek acceptance of a delayed payment in qualifying circumstances, but reinstatement is not automatic. The owner must satisfy the applicable requirements and pay the required amounts. Until the issue is resolved, relying on the patent for enforcement or licensing can carry substantial risk.
Patent owners should track fee dates separately from the projected expiration date. Licensees and potential purchasers should independently confirm payment status rather than relying only on a contract schedule or a statement from the current owner.
Patent Term Adjustments, Extensions, and Other Changes
Some patents last beyond the date produced by a basic term calculation. Patent Term Adjustment, commonly called PTA, can add time when specified USPTO examination delays reduce the patent's effective life. Applicant-caused delays can reduce the adjustment. The issued patent generally states the PTA awarded by the USPTO, although disputes over that calculation can involve strict procedures.
Patent Term Extension, or PTE, addresses a different issue. It may restore part of the patent term lost while a qualifying product underwent government regulatory review before commercial marketing. This issue commonly arises with certain drugs, biologics, and medical devices. A qualifying extension may be up to five years, and the remaining patent term after regulatory approval is generally subject to a 14-year limit. Eligibility and application timing are technical, so owners should evaluate them promptly.
A terminal disclaimer can shorten a patent's term by linking it to the expiration of an earlier related patent. It is often used to address nonstatutory double patenting concerns. Continuation and divisional applications can also share a term date based on an earlier parent filing even though the USPTO grants them years apart.
These rules explain why two patents issued on the same day can expire on different dates, and why two related patents issued years apart may expire together. Pharmaceutical portfolios are particularly fact-dependent because multiple patents can cover a product, formulation, manufacturing process, or use. More detail is available in this guide to pharmaceutical patent protection and drug patent terms.
If a priority claim, maintenance lapse, term adjustment, extension, ownership transfer, or foreign portfolio makes the date uncertain, you can post your legal need on UpCounsel's marketplace. A patent attorney can review the official record, calculate the likely enforceable term, confirm ownership, and assess remaining protection or licensing options. Responses typically arrive within a day, helping you make decisions before a payment, launch, or transaction deadline.
Can a Patent Be Renewed After It Expires?
A patent cannot ordinarily be renewed after its maximum statutory term. Maintenance fee payments are not renewals, and paying the final utility patent maintenance fee does not add years beyond the applicable expiration date. PTA and PTE can change the term only when the patent satisfies specific legal requirements. They are not general renewal options available to every owner.
When a patent expires naturally, its claims generally stop giving the owner the right to exclude others from making, using, selling, offering to sell, or importing the claimed invention in the United States. The disclosed invention is often described as entering the public domain. A former owner may continue producing and selling the product, but cannot rely on the expired patent to exclude competitors.
Expiration of one patent does not guarantee that a product is free to use. A later patent may cover an improvement, component, formulation, manufacturing technique, or method of use. Trademarks may continue protecting product names or branding. Copyright, trade secret, regulatory, and contractual restrictions may also apply independently. A freedom-to-operate review therefore requires more than checking one patent's expiration date.
A new and nonobvious improvement may qualify for its own patent, but the owner cannot extend the old patent merely by making a minor change or filing a related application. The new patent would cover only the separately patentable subject matter described and claimed in it. It would not restore exclusivity over the original invention after the original claims expire.
Drug, Game, and Worldwide Patent Terms
Drug patents use the same basic utility patent framework as other U.S. utility patents, but regulatory review can make their practical lifespan and expiration analysis more complicated. A single medicine may also be associated with several patents that expire at different times. Patent expiration should not be confused with other forms of regulatory exclusivity, which arise under separate rules.
There is no special patent duration solely for games. A game-related invention might involve a utility patent covering eligible functional technology or a design patent covering an ornamental appearance. The applicable term follows the patent type, not the fact that the product is a board game, video game, controller, interface, or game mechanic. Some game elements may instead involve copyright, trademark, or no patent protection at all.
Patent rights are territorial. A U.S. patent generally provides rights only within the United States and its territories. There is no single patent that creates one worldwide expiration date. Applicants may use international filing systems to pursue protection in multiple countries, but each country or regional office applies its own laws, examination process, fees, and term rules.
The Patent Cooperation Treaty streamlines the process of seeking patent protection in multiple participating jurisdictions, but it does not itself grant a worldwide patent. The World Intellectual Property Organization provides general information about the Patent Cooperation Treaty. To determine when foreign protection ends, review each national or regional patent record and the current instructions of the relevant patent office.
Ownership also does not determine duration. Selling, assigning, licensing, or inheriting a patent generally does not restart its term. The new owner or successor receives only the rights that remain, subject to existing licenses, liens, maintenance obligations, and other restrictions.
Frequently Asked Questions
Can You Own a Patent Forever?
No, you cannot own enforceable patent rights forever. You may continue owning the patent document or related business assets after expiration, but the expired claims no longer provide ongoing exclusivity. Businesses seeking longer-lasting protection may use trademarks for source identifiers or protect confidential information as trade secrets, provided those rights independently qualify and remain valid.
Can a Patent Be Renewed After 20 Years?
No, a patent generally cannot be renewed after its statutory term ends. Filing a new application for the same invention will not recreate expired exclusivity because the original disclosure can prevent the subject matter from being considered new. A genuinely new and nonobvious improvement may qualify for separate protection, but its claims must focus on that improvement.
How Much Does a 20-Year Patent Cost?
There is no single price for obtaining and maintaining a 20-year patent. Costs may include USPTO filing, search, examination, issue, and maintenance fees, plus drawings and professional services. USPTO fees vary by application and entity status, while attorney costs depend on the invention's complexity, objections raised during examination, and the amount of work required.
What Happens to a Patent if the Owner Dies?
The patent does not expire merely because its owner dies. Patent ownership may pass through an estate, trust, contract, or other succession arrangement, while the original expiration date remains unchanged. The executor, administrator, trustee, or successor may need to document the transfer and address maintenance fees, licenses, enforcement decisions, and recorded ownership information.
Does an Expired Patent Mean a Product Is Safe to Copy?
No, an expired patent alone does not establish that a product is safe to copy. Other active patents may cover later improvements or different parts of the product. Product names, software, artwork, packaging, confidential information, and contractual obligations may also receive protection under other laws, making a broader clearance review advisable before manufacturing or selling a competing product.
