Understanding Patent Lifespan: Can an Expired Patent Be Renewed?

Short answer: usually no. A U.S. patent that reaches the end of its full term cannot be renewed. A utility patent that expired early because a maintenance fee went unpaid is different: the USPTO may reinstate it if the delay was unintentional.

Understanding Patent Expiration

A U.S. patent generally cannot be renewed after its full statutory term ends. However, a utility patent that expired early because its owner missed a maintenance fee may sometimes be reinstated through a separate USPTO petition process. The reason for expiration determines which rule applies.

For most modern utility patents, the term ends 20 years from the relevant U.S. nonprovisional filing date, or an applicable earlier U.S. application date—not 20 years after the patent issues. The term begins on the grant date, but its end date is counted from the filing date. Patent term adjustment or extension, terminal disclaimers, and particular filing histories can change the final date.

Utility patents generally require maintenance fees at 3.5, 7.5, and 11.5 years after grant. The USPTO also offers a six-month grace period with a surcharge. A patent can expire early if a fee remains unpaid at the end of the applicable grace period. Design and plant patents do not require these maintenance fees.

Amounts depend on entity size and change over time; see the USPTO fee schedule.

Fees vary by entity status and are revised periodically. Use the USPTO’s current fee schedule and Maintenance Fees Storefront when checking a particular patent. For the 20-year term itself, see our guide to renewing a patent after 20 years.

The Importance of Patent Protection

Patent protection can support licensing, investment, and commercial planning, but only for the claims that remain enforceable and only while the patent is in force. A granted patent does not automatically guarantee freedom to operate: other patents may still apply to a product or process.

Track the filing history, any term adjustment or extension, maintenance-fee windows, ownership changes, and patent status. A reliable record is more useful than assuming every utility patent lasts exactly 20 calendar years after grant.

Exploring Patent Renewals

The word “renewal” is often used informally to describe keeping a patent active. Under U.S. law, however, paying maintenance fees preserves an eligible utility patent during its existing term; it does not create another 20-year term.

Patent term adjustment can account for qualifying USPTO delays, and patent term extension can apply to certain products affected by qualifying regulatory review. These are specific statutory mechanisms, not a general opportunity to restart an expired patent. The eligibility requirements and deadlines differ.

Legal Limitations on Patent Renewal

Once the applicable maximum term has ended, the same patent cannot ordinarily be renewed to exclude others for another term. Any surviving rights need to be assessed separately, such as another patent with valid, independently supported claims.

A patent that expired because of an unpaid maintenance fee raises a different question. Under 37 CFR 1.378, the USPTO may accept late payment and reinstate the patent if the entire delay was unintentional and the petition satisfies the current requirements. Reinstatement is not automatic, and intervening rights may affect the restored patent.

Before acting, confirm which event caused expiration: normal term, missed maintenance fee, terminal disclaimer, or a different issue in the prosecution history.

The Process of Renewing an Expired Patent

If the patent expired at the end of its legal term, there is no standard renewal application. If it expired early for a missed maintenance fee, the owner should review the patent record and the USPTO’s reinstatement procedure promptly.

1. Verify the patent number, payment history, and actual reason for expiration using official USPTO records.
2. Identify the missed maintenance-fee window, including the six-month grace period, and confirm whether the patent has already expired.
3. If the patent expired for nonpayment, assess whether the entire payment delay was unintentional under the current petition rules.
4. Prepare the required statement, overdue fee, petition fee, and any additional explanation or evidence required by current USPTO guidance.
5. Obtain professional advice on reinstatement, deadlines, and potential intervening rights before assuming that restored protection will be effective against every third party.

As of 2026, electronic petition eligibility and additional information requirements depend partly on how long ago the patent expired. The USPTO says petitions filed more than one year after expiration require further explanation of the unintentional delay, and a higher petition fee applies.

Conclusion

An expired U.S. patent cannot generally be renewed after its full term ends. The important exception to investigate is an eligible utility patent that expired early because a maintenance fee was unintentionally missed. In that case, reinstatement may be possible through a USPTO petition—not a new patent term.

If you are studying U.S. patent procedure for the Patent Bar, distinguish patent term, maintenance fees, patent term adjustment or extension, and reinstatement after unintentional nonpayment. Those are related but legally separate concepts.