Reviving a Lapsed Patent: USPTO Unintentional-Delay Petition

When a US patent expires because a maintenance fee went unpaid through the end of its grace period, it is not gone for good: the owner can petition the USPTO to accept the delayed payment and reinstate the patent, provided the entire delay was unintentional under 35 U.S.C. § 41© and 37 CFR § 1.378. This page maps that path as a decision tree — confirming the lapse, meeting the unintentional standard, assembling the petition, and understanding the intervening-rights consequences of a grant — so a docketing team knows exactly what a “lapsed” status triggers.

Revival is a recovery mechanism, not a routine payment, and it changes both who is responsible and what rights the reinstated patent carries. This page is the escape path referenced by the Maintenance Fee Docketing specification, and it applies once the effective grace deadline computed in USPTO Maintenance Fee Grace-Period Calculation has passed unpaid.

Step 1 — Confirm the patent has actually lapsed

Revival applies only to a patent that has already expired for non-payment; a fee that is merely late but still within its window is a payment problem, not a petition problem. Before invoking § 1.378, confirm the state precisely:

If the fee is still within the six-month payment window or the six-month grace period, there is no lapse. Pay the fee, adding the 37 CFR § 1.20(h) surcharge if the due date has passed. No petition is needed.
If the effective grace deadline has passed with the fee unpaid, the patent has expired and ordinary payment will be refused. Only a petition to accept delayed payment under § 1.378 can reinstate it.

The distinction is the entire reason a docketing system must give the “lapsed” state its own status code rather than treating it as an especially overdue fee. A lapsed patent routes to counsel and a petition workflow; an in-grace fee routes to a paralegal for immediate payment with surcharge. Conflating the two either wastes a petition on a patent that could simply be paid, or worse, treats an expired patent as still merely late.

Operational Action: Gate the § 1.378 workflow on a confirmed post-grace lapse, and have the docketing record show the effective grace deadline it passed so the responsible team can see at a glance that the patent is expired rather than overdue.

Step 2 — Meet the unintentional-delay standard

Since the elimination of the “unavoidable delay” standard for maintenance fees on 18 December 2013, there is a single standard: the delay in payment must have been unintentional. Under 35 U.S.C. § 41©(1), the Director may accept a delayed maintenance fee if the delay is shown to the Director’s satisfaction to have been unintentional, and § 1.378 implements that standard.

Two features of the standard trip up petitioners. First, the entire period of delay must have been unintentional — from the moment the fee became due, through the grace period, and up to the moment the petition and payment are filed. A delay that was unintentional at first but became a deliberate decision to hold off once the lapse was discovered is no longer unintentional in full, and the petition can fail on that basis. Second, the standard is about the payment being unintentionally delayed, not merely the discovery of the lapse; a party that knew the fee was due and chose not to pay cannot later characterize that choice as unintentional.

The USPTO ordinarily accepts a straightforward statement of unintentional delay at face value, but it may require additional information if there is a question — for example, where the patent lapsed years earlier and the petition is filed only after the patented product became commercially significant. The petition must be signed in compliance with 37 CFR § 1.33(b).

Operational Action: Capture the full delay chronology in the docket — due date, discovery date, and petition date — so that if the USPTO questions the unintentional character of the delay, the record supports a truthful, consistent statement rather than a reconstruction after the fact.

Step 3 — Assemble and file the petition

A § 1.378 petition to accept unintentionally delayed payment must include three things, and a missing element makes the petition incomplete:

The required maintenance fee at the current rate, set out in 37 CFR § 1.20(e) through (g) for the 3.5-, 7.5-, and 11.5-year fees respectively, in the amount corresponding to the patent’s current entity status.
The petition fee set out in 37 CFR § 1.17(m). This is the fee that current rule attaches to the petition; the historical § 1.20(i) surcharge slot for delayed maintenance-fee payment is now reserved, so a system should cite § 1.17(m) rather than the retired provision.
A statement that the delay was unintentional. The statement is a representation to the office and must be accurate; if the person signing cannot truthfully make it, the petition cannot be filed.

Petitions and payments are submitted electronically through Patent Center. The petition is decided by the office rather than granted automatically, so it should be filed as promptly as the facts allow — a long, unexplained gap between discovering the lapse and filing the petition is itself a fact the USPTO may weigh against the unintentional characterization.

Operational Action: Build the petition package from a checklist that verifies all three elements are present and that the maintenance-fee amount matches the patent’s current entity status, and re-verify status under 37 CFR § 1.27 or § 1.29 before filing, because status may have changed during the lapse.

Step 4 — The intervening-rights caveat

A reinstated patent is not restored as if it never lapsed. Under 35 U.S.C. § 41©(2), a patent revived by acceptance of a delayed maintenance fee is subject to intervening rights: a third party who, after the six-month grace period closed but before the fee was accepted, made, purchased, offered to sell, used, or imported something protected by the patent — or made substantial preparation to do so — retains the right to continue that activity. The court may also permit continued practice to the extent and under terms it deems equitable.

This is a substantive consequence, not a formality. A patent that lapsed and was quietly relied upon by competitors during the gap comes back encumbered, and the value of reinstatement depends heavily on how long the lapse lasted and what happened during it. A docketing and portfolio system should therefore record the lapse and reinstatement window explicitly, because that window defines the period in which intervening rights could have arisen.

Operational Action: Record the exact lapse-to-reinstatement window on the patent record, and surface it to counsel evaluating enforcement, because any third-party activity in that window may carry intervening rights that limit what the revived patent can be asserted against.

Step 5 — Outcomes and reconsideration

The petition resolves in one of three ways, shown in the decision tree above:

Granted. The Director accepts the delayed payment, the patent is reinstated, and it is treated as though it had not expired — subject to the intervening rights described above. The docketing system must then reset the maintenance-fee schedule so the next fee is tracked normally.
Further information requested. If the unintentional character of the delay is in question, the USPTO requests more information before deciding. The petitioner supplements the record and the petition is reconsidered.
Dismissed. If the office is not satisfied the delay was unintentional, the petition is dismissed. The petitioner may request reconsideration under 37 CFR § 1.378©, addressing the deficiency the office identified.

Whatever the outcome, the docketing record must capture it. A granted petition reopens an active maintenance-fee obligation that has to be re-docketed under the Maintenance Fee Docketing schedule; a dismissal leaves the patent expired unless reconsideration succeeds, and the matter should not silently revert to an “active” state on the strength of a filed-but-undecided petition.

Operational Action: Treat a filed petition as a pending state distinct from both “lapsed” and “active,” and only mark the patent active — and re-arm the next maintenance-fee window — once the grant is confirmed, so a dismissed petition never leaves a dead patent showing as live.

Frequently Asked Questions

What standard applies to reviving a patent that lapsed for an unpaid maintenance fee?

The unintentional-delay standard. Under 35 U.S.C. § 41(c) and 37 CFR § 1.378, the Director may accept a delayed maintenance fee if the delay in payment is shown to have been unintentional. The older "unavoidable delay" standard for maintenance fees was eliminated in December 2013, so unintentional is now the only route.

What must the petition to accept a delayed maintenance fee include?

Three elements: the required maintenance fee under 37 CFR § 1.20(e) through (g) at the current rate and entity status, the petition fee under 37 CFR § 1.17(m), and a statement that the delay in payment was unintentional. The petition must be properly signed, and the USPTO may request additional information if the unintentional character of the delay is in question.

Does the entire period of delay have to be unintentional?

Yes. The delay must have been unintentional from when the fee became due, through the grace period, and up to when the petition and payment are filed. A delay that started unintentionally but became a deliberate choice to hold off after the lapse was discovered no longer qualifies, which is why a long unexplained gap before filing can defeat the petition.

Is a revived patent as strong as one that never lapsed?

Not necessarily. Under 35 U.S.C. § 41(c)(2) a reinstated patent is subject to intervening rights: a third party who made, used, sold, or substantially prepared to do those things during the lapse — after the grace period but before the fee was accepted — may continue. The value of reinstatement therefore depends on how long the patent was lapsed and what happened during that window.

Maintenance Fee Docketing — the schedule that must be re-armed once a petition is granted.
USPTO Maintenance Fee Grace-Period Calculation — how the grace deadline whose passing triggers a lapse is computed.
USPTO Maintenance Fees vs EPO Annuities — how European re-establishment differs from the US petition path.
Core Docketing Architecture & Deadline Types — the status-code and audit conventions the revival workflow plugs into.

↑ Back to Maintenance Fee Docketing