USPTO Tightens Rules for Unintentional-Delay Petitions
The United States Patent and Trademark Office has issued a final rule that tightens petition practice for delays claimed as “unintentional.” The rule, titled “Conditions for Additional Information and Fee in Petitions Filed in Patent Applications and Patents Based on Unintentional Delay,” was published on June 24, 2026, and takes effect on August 13, 2026.
The key change is that the USPTO is shortening the delay period that may trigger a requirement for additional information. Under the new rule, certain petitions based on unintentional delay may require additional explanation when the delay exceeds one year. Previously, the USPTO’s general threshold for requiring additional information was delays exceeding two years.
This change is important for patent applicants, patent owners, foreign associates, and anyone involved in U.S. patent portfolio transfers. It may affect petitions to revive abandoned patent applications, petitions to accept delayed maintenance-fee payments, petitions to accept delayed priority or benefit claims, and certain petitions involving missed deadlines in international design applications.
Why This Matters
A missed patent deadline does not always mean that the rights are permanently lost. In some cases, the USPTO allows a party to file a petition based on a showing that the entire delay was unintentional. However, the USPTO may require more than a basic statement when the facts raise questions about whether the full period of delay was actually unintentional.
Under the new rule, the need for a clear factual explanation becomes more important once the delay exceeds one year. Petitioners should be prepared to explain what happened, when the missed deadline was discovered, who was responsible for the matter during the relevant time period, and why there was no intentional decision to abandon the application, delay payment, or miss the priority or benefit deadline.
Impact on Abandoned Patent Applications
This rule is especially relevant for abandoned patent applications. When an application has gone abandoned for more than one year, a petition to revive may now require more careful factual support. The USPTO may look for an explanation showing that the entire period of delay, from the missed deadline until the filing of a grantable petition, was unintentional.
For applicants, this means revival should not be treated as a routine administrative filing. The longer the delay, the more important it becomes to reconstruct the file history and document the reason for the missed deadline.
Impact on Maintenance Fees
The rule may also affect patents that expired because a maintenance fee was not paid on time. Patent owners often discover missed maintenance-fee issues during portfolio audits, licensing discussions, due diligence, or transfer of responsibility from one firm to another. If the delay exceeds one year, the petition may require additional explanation supporting that the entire delay was unintentional.
For companies with larger patent portfolios, this increases the importance of docket review, maintenance-fee tracking, and early identification of expired patents.
Impact on Priority and Benefit Claims
The rule also matters for delayed priority and benefit claims. Priority claims can be critical to patent validity and enforceability because they may determine the effective filing date of the claimed invention. When a priority or benefit claim was missed, and the delay exceeds one year, the applicant should be prepared to provide a more complete explanation of the circumstances surrounding the delay.
This is particularly important for U.S. national stage filings, foreign-priority U.S. applications, continuation practice, and cases transferred from foreign counsel.
Importance for Portfolio Transfers and Foreign Associate Work
The new rule has practical consequences for patent portfolio transfers and foreign associate work. When U.S. matters are transferred from one attorney, firm, owner, or foreign associate to another, missed deadlines may surface during intake. Abandoned applications, expired patents, missing priority claims, and unresolved docket issues should be flagged early.
A proper transfer review should identify:
Whether any U.S. patent applications are abandoned
Whether any patents expired for nonpayment of maintenance fees
Whether any priority or benefit claims were missed
When the missed deadline occurred
Who controlled the file during the relevant period
Whether there is documentary support showing the delay was unintentional
The practical lesson is straightforward: revival and late-correction work is becoming more fact-sensitive. Petitioners should not assume that a basic form statement will be enough when the delay is more than one year.
Conclusion
The USPTO’s new final rule makes timing and documentation more important in petitions based on unintentional delay. For patent applicants and owners, the best approach is to identify missed deadlines early, preserve the factual record, and act promptly once an issue is discovered.
For foreign associates and firms transferring U.S. patent matters, this rule creates another reason to conduct a careful U.S. docket review during onboarding. A missed deadline may still be correctable, but the explanation supporting the petition now matters more than ever.
https://www.federalregister.gov/documents/2026/06/24/2026-12717/conditions-for-additional-information-and-fee-in-petitions-filed-in-patent-applications-and-patents
