Under 37 CFR 1.116, after-final amendments and affidavits fall into three tiers with escalating requirements: the examiner must enter some changes, may enter others at their discretion, and will only enter substantive rewrites or new evidence if you show good and sufficient reasons for the change and for the delay. Knowing which tier your filing sits in is the single biggest factor in whether it gets entered before your response deadline runs out.
The Three Tiers of Entry
The regulation sorts after-final filings by how much work they demand from the examiner and how much justification they demand from you.
The first tier covers cancellations and formal fixes. If you cancel claims, or if you correct a formal defect the examiner specifically flagged in the final rejection — claim numbering, a drawing objection, a dependency error — the examiner enters the change without special justification.1eCFR. 37 CFR 1.116 – Amendments and Affidavits or Other Evidence After Final Action and Prior to Appeal
The second tier covers amendments that put rejected claims in better form for appeal. Rewriting claims to sharpen the issues the Patent Trial and Appeal Board would review — without expanding scope or introducing new arguments — may be admitted. Whether the changes genuinely simplify the appeal or just repackage the same disputes is the examiner’s call.1eCFR. 37 CFR 1.116 – Amendments and Affidavits or Other Evidence After Final Action and Prior to Appeal
The third tier is the hard one. Any amendment that changes the substance of your claims requires you to show good and sufficient reasons why the change is necessary and why you did not make it earlier. If the examiner previously indicated that a specific change would result in allowance, an amendment making exactly that change clears the bar easily. If you are adding limitations you could have proposed months ago, the examiner will almost certainly refuse entry.1eCFR. 37 CFR 1.116 – Amendments and Affidavits or Other Evidence After Final Action and Prior to Appeal
One point cuts across all three tiers: getting an amendment entered does not stop the clock on your response deadline or rescue the application from abandonment. The regulation says outright that entering or refusing an amendment does not change the application’s status as subject to appeal.1eCFR. 37 CFR 1.116 – Amendments and Affidavits or Other Evidence After Final Action and Prior to Appeal
Why Examiners Refuse Entry
Examiners cannot refuse arbitrarily, but they also have no obligation to reopen prosecution because you filed something. The controlling question is whether the amendment puts the application in condition for allowance or in better form for appeal.2United States Patent and Trademark Office. MPEP Section 714 – Amendments, Applicant’s Action
A refusal typically comes when the proposed changes:
- Would not overcome the rejection. If the amended claims still fall under the same prior art or the same legal deficiency, entry accomplishes nothing.
- Raise new issues requiring further search. This is where most after-final amendments fail. Adding a technical limitation the examiner has never evaluated forces a fresh search, which defeats the purpose of finality.
- Introduce new matter. Federal law prohibits adding subject matter that was not part of the original disclosure.3Office of the Law Revision Counsel. 35 USC 132 – Notice of Rejection; Reexamination
- Add claims without canceling any. Piling on new claims after final rejection does not simplify anything for appeal.4United States Patent and Trademark Office. After Final Practice and Request for Continued Examination
p>Amendments that cancel all rejected claims while leaving allowed claims intact are the friendliest to entry. So are narrowing amendments that pull in features the examiner has already searched. If a prior interview or Office action told you a specific limitation would produce allowance, put that in your remarks and point to where the examiner said it.
When the examiner refuses entry, they must give concise reasons. Those reasons appear in an Advisory Action on Form PTOL-303, which tells you whether the submission was entered or refused and why.4United States Patent and Trademark Office. After Final Practice and Request for Continued Examination The advisory action is not a new Office action. It does not reset deadlines or give you another round of prosecution.
Affidavits and Other Evidence After Final
New evidence submitted after final rejection faces the same good-and-sufficient-reasons standard as a substantive amendment. You have to explain why the evidence is necessary and why you did not present it earlier.1eCFR. 37 CFR 1.116 – Amendments and Affidavits or Other Evidence After Final Action and Prior to Appeal
The most common vehicle is a declaration under 37 CFR 1.132, used to challenge a rejection or objection on grounds not otherwise provided for in the rules.5eCFR. 37 CFR 1.132 – Oath or Declaration These declarations often include comparative test results showing unexpected properties, or expert testimony clarifying a technical point the examiner misunderstood. Each piece of evidence needs to tie directly to a specific ground of rejection in the final action. Vague assertions that the invention is generally superior will not move the needle.
Timing matters as much as substance. If your evidence rests on test results that only became available after the final rejection, say so with dates. If the evidence responds to a new characterization of the prior art that appeared for the first time in the final action, that is itself a good reason for the late submission. Broad statements about the invention’s complexity, with no concrete tie to the prosecution timeline, rarely persuade.
Deadlines, Extensions, and How the Advisory Action Changes Them
After a final rejection, your reply options narrow to three: file an appeal, file an amendment under 37 CFR 1.116, or file a Request for Continued Examination.6eCFR. 37 CFR 1.113 – Final Rejection or Action The shortened statutory period is typically three months from the mailing date of the final rejection. The absolute ceiling is six months from that date.7United States Patent and Trademark Office. MPEP Section 710
You buy the extra months in one-month increments by filing a petition and paying an extension fee. The fees escalate sharply:
- First month: $235 large entity, $94 small entity, $47 micro entity
- Second month: $690 / $276 / $138
- Third month: $1,590 / $636 / $318
- Fourth month: $2,495 / $998 / $499
- Fifth month: $3,395 / $1,358 / $679
The fees are cumulative for the months of delay taken.8United States Patent and Trademark Office. USPTO Fee Schedule Miss the six-month outer boundary and the application goes abandoned. Once you file a notice of appeal, jurisdiction shifts to the PTAB and the examiner can no longer act on a 1.116 amendment.
The advisory action interacts with the deadline in a way worth planning around. If you filed a complete first reply within two months of the final rejection and the examiner mails the advisory action after the three-month period would otherwise expire, your deadline extends to the mailing date of the advisory action.9United States Patent and Trademark Office. MPEP Section 706 – Rejection of Claims Your extension fees are then calculated from whichever date is later: three months after the final rejection, or the advisory action mailing date. The six-month ceiling still applies.
When Your After-Final Amendment Is Refused
A refused amendment is not the end of the case. Several paths remain, each with its own cost and strategic angle.
Request for Continued Examination
An RCE reopens prosecution entirely. You file a new submission with the RCE fee, and the examiner treats the case as if prosecution never went final. This is the usual move when you have substantive changes the examiner would not enter after final.10eCFR. 37 CFR 1.114 – Request for Continued Examination
As of April 2026, a first RCE costs $1,500 for a large entity, $600 for a small entity, or $300 for a micro entity. A second or subsequent RCE jumps to $2,860 / $1,144 / $572.11United States Patent and Trademark Office. USPTO Fee Schedule – Current File it before the application goes abandoned and before you file a notice of appeal to the Federal Circuit.
Pre-Appeal Brief Request for Review
If you think the rejection is clearly wrong, file a Pre-Appeal Brief Request for Review alongside your notice of appeal. A conference of the examiner and at least two other USPTO officials reviews the rejection. Your arguments are limited to five pages, and you cannot include amendments.12United States Patent and Trademark Office. Pre-Appeal Brief Request for Review If the panel agrees the rejection should not stand, prosecution reopens without the cost of a full appeal brief. If not, you proceed with the appeal.
Petition to the Director
If the examiner improperly refused entry — for example, refusing a first-tier amendment that only canceled claims — you can challenge that decision by petition under 37 CFR 1.181. Include a statement of facts and supporting arguments, and file within two months of the advisory action.13eCFR. 37 CFR 1.181 – Petition to the Director The petition does not pause your response deadline. You still need to file a notice of appeal or take other action before the six-month statutory period expires.
Appeal to the PTAB
Filing a notice of appeal shifts jurisdiction to the Patent Trial and Appeal Board, and you then prepare an appeal brief. This is the most formal option, and it fits best when the disagreement is about how the examiner read the prior art rather than about claim language you want to change.
AFCP 2.0 Is No Longer an Option
If you have seen older guidance recommending the After Final Consideration Pilot Program 2.0, be aware it closed on December 14, 2024, and the USPTO has not announced a replacement. The program had given examiners extra time to search and evaluate after-final amendments and included a no-fee interview, subject to filing at least one non-broadening amendment to an independent claim. After-final amendments filed now are evaluated solely under the standard 37 CFR 1.116 framework.14United States Patent and Trademark Office. After Final Consideration Pilot Program 2.0