Patent Prosecution · Docketing

Patent Abandonment

A patent application can be abandoned in three ways: deliberately (express), inadvertently by missing a response deadline (constructive), or by failing to pay the issue fee. Revival is possible — but only within strict time limits. After 6 months from a missed deadline, the application is gone permanently.

Maximum OA response period

6 months (statutory limit)

Absolute revival bar

6 months from abandonment

Revival petition fee (large)

$2,000

Revival petition fee (small)

$1,000

Unintentional delay statement

Verified — no facts required unless asked

PCT national phase revival window

Up to 2 years (U.S.)

Abandonment Types

Four ways a patent application is abandoned

Express Abandonment

37 C.F.R. § 1.138

When: Applicant voluntarily files a written statement of abandonment
Cause: Deliberate decision — application is commercially unviable, all claims were allowed via continuation/divisional, or prosecution is being terminated for any reason
Revival: Not revivable once processed. A continuation or divisional filed before the abandonment becomes effective inherits the priority date.

Warning: Express abandonment takes effect when processed by the USPTO — not necessarily the day it's filed. File any continuation or divisional BEFORE submitting the express abandonment to preserve the chain of priority.

Constructive Abandonment (Failure to Respond)

35 U.S.C. § 133 / 37 C.F.R. § 1.135

When: Applicant fails to file a timely response to an Office Action or Notice of Allowance
Cause: Response to Office Action not filed within the set statutory period (3 months for fee, extendable to 6 months maximum); issue fee not paid within 3 months of Notice of Allowance (extendable to 3 months via form petition, no further extension); response to a Notice to File Missing Parts or other notice not filed on time
Revival: Revivable under 37 C.F.R. § 1.137 if unintentional (see below). After 6 months from the mailing date of the missed action: ABSOLUTE BAR — no revival possible regardless of reason.

Warning: The 6-month statutory bar is absolute and unforgiving. Courts have refused to make equitable exceptions. Even unavoidable delay arguments fail after 6 months. File as soon as the abandonment is discovered — every day of delay is dangerous.

Constructive Abandonment (Failure to Pay Issue Fee)

37 C.F.R. § 1.316

When: Issue fee not paid within 3 months of the Notice of Allowance; short extension available by petition (no equivalent to the 6-month OA extension)
Cause: Billing error, applicant did not receive the NOA, docketing failure, end-of-entity-status change
Revival: Petition to withdraw abandonment under 37 C.F.R. § 1.137(a) (unavoidable) or § 1.137(b) (unintentional); also § 1.316 (revival of a patent application that was abandoned for failure to pay the issue fee). Requires a petition, the unintentional-delay statement or showing, and payment of all outstanding fees.

Warning: Issue fee failure is a common cause of abandonment because NOAs are delivered to correspondence addresses that may be outdated, and unlike prosecution responses, issue fees have no automatic 6-month extension.

Abandonment by Failure to Enter National Phase

37 C.F.R. § 1.495 / § 371

When: PCT application fails to enter U.S. national phase within 30 months of earliest priority date (31 months for some countries)
Cause: National phase entry deadline missed — a hard cutoff in most PCT contracting states
Revival: In the U.S.: petition under 37 C.F.R. § 1.137(b) (unintentional delay) is available within 2 years of the missed deadline; revival restores the application for U.S. examination. Many PCT member states outside the U.S. have stricter revival rules or no revival at all — restoration of PCT priority is governed by PCT Rule 49.6 and is country-specific.

Warning: PCT deadlines are calendared errors with enormous commercial consequences. Use a reliable patent docketing system with dual-redundancy alerts set at 6 months, 3 months, 1 month, and 1 week before the deadline. The 30/31-month deadline is statutory; no fee extension exists.

Revival Procedure

Step-by-step: reviving an abandoned application

Determine eligibility for revival

First, verify the application has not been abandoned for more than 6 months (for a missed OA response) or, for national phase entry failures, that you are within 2 years of the missed deadline. Check the USPTO Patent Center application status. If more than 6 months have passed from a missed OA response deadline, the application is dead and cannot be revived — the 6-month bar under 35 U.S.C. § 133 is absolute. If within the window, proceed. Also check whether the abandonment was caused by unavoidable delay (§ 1.137(a)) or unintentional delay (§ 1.137(b)) — the standard differs.

File the response or issue fee that should have been filed

The revival petition must be accompanied by the response or fee payment that would have been required to maintain the application — an OA response, the issue fee, a national phase entry package, or whatever triggered the abandonment. The petition asks for revival; the underlying response or fee payment is required simultaneously. Filing the response alone, without a petition, does not revive the application. Filing the petition alone, without the required response, does not move prosecution forward.

File the petition with the unintentional-delay statement

Under 37 C.F.R. § 1.137(b) (unintentional delay — the most commonly used standard), the petition must include: (a) a petition fee (currently $2,000 large entity / $1,000 small entity / $500 micro entity); (b) a statement that the entire delay in filing the required reply from the due date for the reply until the filing of a grantable petition was unintentional (this is a verified statement — the petitioner is certifying under 37 C.F.R. § 1.4(d)(1)); (c) if the USPTO specifically requests it: facts establishing the unintentional nature of the delay. The statement does not need to describe specific facts unless the USPTO asks — but it must be truthful. A delay is 'unintentional' if it was not a deliberate choice to abandon. Docketing errors, attorney-client communication failures, and clerical mistakes are unintentional; a deliberate decision to stop prosecuting is not.

Unavoidable delay (§ 1.137(a)) — a higher standard

Revival for 'unavoidable' delay requires showing the delay could not have been avoided even with the exercise of due care — a significantly harder standard. Unavoidable delay typically requires: a showing of specific events beyond the applicant's and attorney's control (natural disaster, incapacitating illness, government shutdown directly preventing filing); a detailed factual record; and often is used for situations like errors in the USPTO's records rather than practitioner docketing failures. In practice, § 1.137(b) unintentional delay is used in virtually all revival petitions — it costs the same and requires only the signed statement. § 1.137(a) is preserved for truly exceptional circumstances.

USPTO grants or denies the petition

The USPTO Office of Petitions reviews the revival petition. If granted, the application is revived and prosecution resumes as of the revival date. The period of abandonment does not count toward patent term adjustment (PTA) — in fact, the abandoned-then-revived application likely incurs PTA deductions as 'applicant delay' for the period of abandonment. If the petition is denied, the applicant may request reconsideration. If reconsideration is denied, the applicant can petition the Director under 37 C.F.R. § 1.181, or file a civil action in federal district court — though the latter is rarely attempted.

Consider continuation strategies if revival is not possible

If revival is not available (6-month bar exceeded, or the petition was denied), the applicant may still be able to file a continuation application — but only if the parent application was co-pending at the time the continuation is filed. A co-pending requirement means there was at least one pending non-abandoned application in the family at all relevant times. If the parent is abandoned with no pending co-pending application, the entire priority chain is broken. Defensive publication of the specification may be considered to create prior art blocking competitors from patenting the same invention.

Alternatives

Before you abandon — four alternatives to consider

File a continuation before abandoning

If prosecution has reached an impasse but the technology remains valuable, file a continuation application before abandoning the parent. The continuation inherits the parent's priority date and restarts prosecution with fresh claims. This is the most common strategy — the parent is then expressly abandoned after the continuation confirms the priority chain. The continuation can pursue different claim scope, different dependent claim combinations, or a restructured independent claim to address the prior art.

File a Request for Continued Examination (RCE)

An RCE reopens prosecution after a final rejection without breaking the priority chain and without requiring a new application. An RCE is substantially less expensive than a continuation ($3,520 large entity + attorney fees) and does not affect the § 120 benefit chain. RCEs allow claim amendments, new arguments, and the submission of supplemental declarations. The downside: RCE pendency does not count toward Patent Term Adjustment B-delay.

Defensive publication

If the invention has value as a defensive tool — to prevent competitors from patenting the same subject matter — but is not worth the cost of continued prosecution, consider a defensive publication. Publishing a defensive technical disclosure (e.g., via IP.com, Defensive Patent License, or a technical journal) creates prior art that prevents others from obtaining a patent on the same technology. This is often used for incremental improvements, implementation details, or technology with limited licensing value but high block-the-competition value.

Consider trade secret protection

If the invention can be kept confidential (not observable from a marketed product) and has a meaningful competitive life, abandoning the application and converting to trade secret protection may be preferable. Trade secret protection has no term limit as long as secrecy is maintained, costs nothing in government fees, and prevents reverse-engineering claims under the Defend Trade Secrets Act (DTSA). It is eliminated by publication of the abandoned application (USPTO publishes abandoned applications 18 months from filing) — if trade secret is the goal, file an express abandonment BEFORE the 18-month publication date.

FAQ

Frequently asked questions

What happens when a patent application is abandoned?

When a patent application is abandoned, the applicant loses the right to the pending claims in that application. The application is removed from prosecution — no patent will issue based on it unless it is successfully revived. For constructive abandonment (missed response deadline), the application becomes abandoned on the day the statutory response period expires. The patent right claimed in that application is gone — however, the SPECIFICATION and the PRIORITY DATE survive in certain ways: (1) The abandoned application publishes 18 months after its effective filing date (unless an express abandonment is filed and processed before the 18-month date, or a non-publication request was filed at the outset). After publication, the specification becomes prior art against subsequent applications. (2) If a continuation, continuation-in-part, or divisional was filed and co-pending with the abandoned parent, those applications keep the parent's priority date and are not affected by the parent's abandonment. (3) The abandoned application may be cited as prior art in a competitor's IPR or examination proceeding. Practically: abandonment extinguishes that particular application's patent rights but does not necessarily end the technology's patentability — related applications may still be pending or revivable. The worst case is an abandoned application with no co-pending family members and a published specification that is prior art against you.

Can an abandoned patent application be revived?

Yes — but only if the revival is sought within the applicable time limit. For a constructive abandonment caused by a missed Office Action response: the application can be revived if the petition for revival is filed within 6 months of the abandonment date (the date the response was due). After 6 months, a § 133 absolute bar applies and revival is legally impossible — no court or USPTO petition can overcome it. For other types of abandonment (failure to pay the issue fee, missed national phase entry), different time limits apply: typically up to 2 years for PCT national phase failure, and a shorter window for issue-fee failures. Revival requires: (1) a petition under 37 C.F.R. § 1.137(b) (unintentional delay), filed with a government petition fee ($2,000 large / $1,000 small / $500 micro entity); (2) the required response, fee payment, or other filing that was missed; (3) a verified statement that the delay was 'unintentional.' The statement does not require a detailed factual explanation unless the USPTO specifically requests one. Most properly documented revival petitions under § 1.137(b) are granted. Revival after successful petition restores the application to active prosecution as of the revival date. However, the period of abandonment results in applicant-delay deductions from Patent Term Adjustment — the application does not 'make up' the abandonment period by getting additional patent term.

What is the 6-month absolute bar to patent application revival?

The 6-month absolute bar is a statutory provision under 35 U.S.C. § 133 that makes it legally impossible to revive a patent application if the petition for revival is filed more than 6 months after the application became abandoned (measured from the date the missed response was due). The 6-month bar is absolute — there are no exceptions, regardless of the reason for the delay. Even if the delay was caused by a natural disaster, a serious illness, or a situation that would otherwise qualify as 'unavoidable' under 37 C.F.R. § 1.137(a), the 6-month bar cannot be overcome once passed. Courts have uniformly upheld this bar against equitable exception arguments. Calculation: if an Office Action issued on March 1, with a 3-month shortened statutory period (extendable to 6 months), the final response deadline is September 1. If no response is filed, the application is abandoned September 1. The 6-month revival window runs from September 1 to March 1 of the next year. Any revival petition filed after March 1 is beyond the bar and will be denied. The practical lesson: when an abandonment is discovered, calculate the 6-month bar date immediately and treat it as the most critical deadline in the entire matter. Contact USPTO counsel the same day — not the same week.

Can you file a continuation after an application is abandoned?

A continuation application can only be filed while the parent application is still pending — meaning before it is abandoned. Under 35 U.S.C. § 120 and 37 C.F.R. § 1.78(d)(1), a continuation must be co-pending with the parent application it claims benefit from. If the parent is abandoned before the continuation is filed, the continuation cannot claim the parent's priority date because there was no co-pendency. However, there is a short timing window that creates some practical flexibility: a continuation may be filed on the same day as the parent's abandonment becomes effective (since the application is still technically 'pending' on the date of abandonment, not after). More importantly, if the continuation was already filed and co-pending while the parent was pending, the parent's subsequent abandonment does not affect the continuation's priority claim — the co-pendency requirement was already satisfied. This is why the standard prosecution strategy is to file a continuation before expressly abandoning the parent — you preserve the chain. If the parent was constructively abandoned (missed response), and you discover the abandonment, you cannot file a continuation to preserve priority because the co-pendency requirement is already broken. Your only options are revival (if within the 6-month window) or starting fresh with a new application that claims priority only from any still-pending family member. This is why preventing abandonment (good docketing, calendar monitoring, timely responses) is infinitely cheaper than dealing with its consequences.

Does an abandoned patent application become public?

In most cases, yes — a patent application that was abandoned after 18 months from its earliest effective filing date has already been published (or will be published) and therefore becomes public prior art. Under 35 U.S.C. § 122(b), USPTO publishes utility and plant patent applications 18 months after the earliest effective filing date — this occurs regardless of whether the application is later abandoned, unless a non-publication request was timely filed at the outset and the application has no corresponding foreign application. If publication has already occurred, the specification is a public document and prior art for purposes of § 102. The abandoned published specification can be cited against your own future applications (self-referential prior art), against competitors, and by examiners worldwide. If the application is abandoned BEFORE the 18-month publication date AND a non-publication request was filed, the specification may be kept confidential. Filing an express abandonment before the 18-month date with a non-publication request in place is a strategy used when the applicant wants to convert to trade secret protection — if the specification remains unpublished and the invention can be kept secret, trade secret protection is preserved. If the application has already published: the specification is prior art and cannot be made confidential again, but any prosecution history (office actions, claim amendments) that occurred after the application became abandoned but before the publication date may or may not be accessible depending on USPTO records.