Patent expiration depends on the patent type, relevant filing or issue dates, and events that shorten or extend the term. To evaluate a specific U.S. patent, you must review the patent document and its official status records rather than rely on a simple 20-year rule.
Key Takeaways
- Utility and plant patents generally have a 20-year term measured from the relevant filing date, but related applications can affect which date controls.
- Design patents generally run from issuance, not filing, and receive either a 14-year or 15-year term depending on the filing date.
- Utility patents can expire early when required maintenance fees are not paid.
- Patent term adjustment, patent term extension, terminal disclaimers, and reissue history can change the apparent expiration date.
- An expired patent generally cannot prevent future use of its claimed invention, but related patents and other intellectual property rights may still apply.
- A list of patents expected to expire in 2026 is only a starting point because patent status can change.
What Patent Expiration Means
Patent expiration ends the patent owner's right to exclude others from making, using, selling, offering to sell, or importing the invention covered by the expired claims. The patent document remains publicly available as a technical and historical record, but the expired patent generally cannot support a claim based on activity occurring after expiration.
Expiration does not erase the patent or prove that every aspect of a product is free to use. A product may practice claims from multiple patents. A continuation, divisional, improvement patent, or separately owned patent may remain active after an older patent expires. Trademarks, copyrights, trade secrets, contracts, and regulatory rules may also affect commercialization. For an overview of how these rights differ, review patent, trademark, and copyright protection.
Patent expiration is also different from abandonment or invalidation. An application can be abandoned before any patent issues. An issued utility patent can lapse because maintenance fees were not paid. A court or the USPTO can find patent claims invalid through an authorized proceeding. These events may all eliminate enforceable patent rights, but they occur for different legal reasons and may have different consequences.
Do not assume that an invention is available merely because its best-known patent is old. Confirm the status of that patent, review its family and related applications, and search for later patents covering improvements or different features.
How Long Do Utility, Plant, and Design Patents Last?
The ordinary patent term depends first on the patent type. Utility patents protect qualifying processes, machines, manufactures, compositions of matter, and improvements. Plant patents protect qualifying distinct and new plant varieties. Design patents protect qualifying ornamental designs for articles of manufacture. If you are still deciding what protection an invention may qualify for, see when an idea may be patentable.
| Patent Type | Ordinary Term | Starting Event | Maintenance Fees | Common Complications |
|---|---|---|---|---|
| Utility | Generally 20 years | Relevant U.S. nonprovisional or international filing date, including certain earlier related applications | Yes | Priority chain, terminal disclaimer, term adjustment, term extension, fee lapse, or reissue |
| Plant | Generally 20 years | Relevant filing date | No | Related applications, disclaimers, and applicable term changes |
| Design filed on or after May 13, 2015 | 15 years | Issue date | No | Reissue or other changes reflected in the record |
| Design filed before May 13, 2015 | 14 years | Issue date | No | Reissue or other changes reflected in the record |
Older utility and plant patents may be subject to transitional rules. Certain patents that were in force on June 8, 1995 received the longer of the applicable 17-year term from issuance or 20-year term measured under the filing-date rule. Because these patents involve historical dates and potentially complex records, calculate them individually instead of applying the current rule automatically.
How to Calculate a Patent Expiration Date
You can estimate an expiration date through a free, record-based process. Treat the result as an estimate until you have considered every filing and legal-status event that could affect the term.
- Confirm the patent number. Distinguish the issued patent number from an application publication number. A design patent number commonly includes a design designation, while plant and reissue patents also use identifying prefixes.
- Open the patent document. Search the USPTO's Patent Public Search records and review the patent's front page, bibliographic data, related application information, and filing history.
- Identify the patent type. Decide whether the record concerns a utility, plant, design, or reissue patent. This determines whether the ordinary term starts from a filing date or the issue date.
- Find the controlling date. For a modern utility or plant patent, inspect any continuation, divisional, or other domestic benefit claims. The relevant date may be an earlier nonprovisional filing date in the application chain, not the date printed as the filing date of the latest application.
- Apply the ordinary term. Add the applicable 20-year filing-based term or 14-year or 15-year issue-based design term.
- Review events that change the result. Check for maintenance-fee lapse, a terminal disclaimer, patent term adjustment, patent term extension, reissue, disclaimer, or other status event.
The USPTO's Patent Term Calculator can help organize these dates. Its output is an estimate, not a legal determination of enforceability. You must still verify the inputs against the patent document, prosecution history, and current status records.
Factors That Can Shorten or Extend the Patent Term
A basic date calculation may not reveal the actual enforceable term. Several events can change the result or make the record harder to interpret.
- Patent term adjustment: Certain utility and plant patents may receive additional term for qualifying USPTO examination delays. The patent document may display an adjustment, but the prosecution record can be necessary to understand it.
- Patent term extension: Certain patents covering regulated products may qualify for an extension associated with regulatory review. This issue often arises with pharmaceuticals and medical products, but an extension applies only when legal requirements are satisfied.
- Terminal disclaimer: An applicant may disclaim the part of a patent term extending beyond the term of another patent or beyond a stated date. A terminal disclaimer can therefore produce an earlier expiration date than the ordinary calculation suggests.
- Related applications: Continuations, divisionals, and certain other applications can claim the benefit of earlier applications. The earliest relevant nonprovisional filing date in that chain may control a modern utility patent's ordinary term.
- Reissue: A reissue patent replaces an original patent but generally does not create a new full patent term. Review both records to understand the remaining term and the claims involved.
- Disclaimer or invalidity: A patent owner can disclaim claims or term. Separately, claims may be held invalid in litigation or canceled through USPTO proceedings. Invalidation is not ordinary expiration, even though it can eliminate enforceability.
Foreign priority and provisional filings require careful treatment because seeing an earlier date on the patent does not automatically mean that date starts the ordinary U.S. term. Read the complete continuity information before selecting the controlling date.
If priority claims, related applications, a terminal disclaimer, maintenance-fee history, adjustment, extension, or a planned launch affects your calculation, you can post your legal need on UpCounsel's marketplace. A patent attorney can review prosecution and status records, calculate the likely enforceable term, and assess related rights affecting your proposed activity. Responses typically arrive within a day, helping you evaluate the issue before committing to manufacturing, investment, or a product release.
Maintenance-Fee Expiration and Possible Revival
Maintenance fees apply to U.S. utility patents, but not to design or plant patents. For utility patents, fees are due 3 years and 6 months, 7 years and 6 months, and 11 years and 6 months after issuance. The USPTO also provides a six-month grace period in which the owner may pay the maintenance fee with the applicable surcharge.
If the owner does not pay by the end of the grace period, the patent expires for nonpayment. That fee-related expiration is different from reaching the end of the full statutory term. The USPTO may accept a petition to reinstate a patent after an unintentional delay if the governing requirements are met. As a result, a record showing fee-related expiration deserves additional review before you invest in commercial use. The possibility of reinstatement can affect the risk analysis, including the treatment of activities occurring before or after reinstatement.
Start with the patent's maintenance-fee history and transaction records. For a focused explanation of status labels and lapse, see fee-related patent expiration. Fees and surcharges change, so consult the USPTO's current fee schedule rather than relying on an old quoted amount.
A lapsed patent is not necessarily an asset you need to buy before using the disclosed technology. If enforceable rights have ended, purchasing the patent does not restore exclusivity by itself. A transaction may still concern ownership, reinstatement rights, associated applications, past claims, technical materials, or other intellectual property, but those assets require separate due diligence.
Can You Use or Improve an Expired Patent?
You can generally practice the claims of a fully expired U.S. patent in the United States without obtaining a license under that patent. You may use the patent's description and drawings as a technical resource, manufacture the disclosed invention, or develop an improvement. However, expiration of one patent does not provide a complete freedom-to-operate opinion.
Begin by reading the claims, which define the patent's protected scope. Then review cited and related applications, assignments, continuations, divisionals, and later improvement patents. A newer patent may cover a component, manufacturing method, formulation, ornamental design, or use even though the foundational patent has expired. Rights in other countries must be checked separately because U.S. expiration does not establish foreign status.
You cannot obtain a new patent on the original expired invention merely by copying it. The expired patent is prior art. A genuine improvement may qualify for its own patent if it meets applicable requirements, including novelty and nonobviousness, but the improvement patent would cover only what is validly claimed. For design-focused development, design patent costs and filing considerations may also be relevant.
Patent expiration does not authorize use of another company's brand name, copyrighted materials, confidential information, or regulated product approval. It also does not resolve contracts that limit use of technology. Evaluate these independent restrictions before launching a product based on an old, abandoned, or expired patent.
How to Research Patents Expiring in 2026
There is no permanent list of all patents expiring in 2026 that can be accepted without verification. A useful list must state when it was created, what patent types it includes, what assumptions it uses, and whether it accounts for later fee payments, terminal disclaimers, adjustments, extensions, reissues, and status changes.
To build a working list, search official patent records by relevant filing or issue dates. For a basic utility or plant patent estimate, 2026 candidates may include records whose controlling filing date is approximately 20 years earlier. That filter will both omit and overinclude patents because the visible filing date may not control and term-changing events may apply. For design patents, search by issue date and apply the 14-year or 15-year rule based on when the design application was filed.
After collecting candidates, review each patent individually. Confirm its type, continuity chain, issue date, ordinary term, adjustment or extension, terminal disclaimer, maintenance history, and current legal status. Record the date on which you checked the information. Repeat the status check shortly before relying on the result for a transaction, launch, or investment decision.
Industry lists, including lists of pharmaceutical patents expected to expire, may use additional assumptions about particular products or regulatory rights. A drug can also be associated with multiple patents having different claims and expiration dates. The expiration of one listed patent therefore does not necessarily establish that a competing product can immediately enter the market.
Frequently Asked Questions
Do All Patents Expire After 20 Years?
No, all patents do not expire after exactly 20 years. Modern utility and plant patents generally use a 20-year filing-based term, while design patents use a 14-year or 15-year term from issuance. Older transitional rules, maintenance-fee lapse, disclaimers, adjustments, extensions, and related applications can produce a different date.
What Patents Are Expiring in 2026?
Patents expiring in 2026 must be identified through a date-specific search and individual status review. Search official records for likely filing or issue dates, then verify continuity claims, fee history, disclaimers, adjustments, extensions, and current status. Any published 2026 list can become inaccurate when records or legal status change.
Can I Still Use a Patent That Has Expired?
Yes, you can generally use the invention claimed by a fully expired U.S. patent without permission under that patent. You should still check for active continuation, improvement, design, or foreign patents, as well as trademarks, copyrights, contracts, and regulatory restrictions that may independently limit your proposed use.
How Much Is a 20-Year Patent?
There is no single price for a 20-year patent because 20 years describes a potential term, not a flat-cost product. Total cost can include application, search, examination, attorney, drawing, issue, and maintenance expenses. Entity status, claim count, application complexity, prosecution history, and changing USPTO fees all affect the amount.
Can You Buy an Expired Patent?
You may acquire whatever transferable ownership interests remain, but buying a fully expired patent does not recreate the expired right to exclude competitors. A transaction may still include related applications, technical information, trademarks, contractual rights, or possible reinstatement interests. The agreement should identify exactly which assets and rights are being transferred.
Can a Patent Be Revived After It Expires?
A utility patent that expired for an unintentional maintenance-fee delay may sometimes be reinstated after the USPTO accepts the required petition and payment. A patent that reached the end of its full statutory term cannot simply be renewed. Rights arising after reinstatement may also be subject to legal limits protecting certain intervening activities.
