You’ll launch a Post‑Grant Review to secure legal certainty within the nine‑month window after issuance. By filing promptly, you invoke § 325, challenging the patent under §§ 101, 102, 103, 112, and compel PTAB discovery, cross‑examination, and an immediately appealable Federal Circuit ruling. Verify your petition names all parties, broad claims, evidence, and standing, adhering to the 70‑page limit and ten‑day reply cap. Critical continued analysis will illuminate how to avoid estoppel and maximize your PTAB agenda.

Key Takeaways

• The nine‑month window opens on the patent’s issuance or re‑issuance date, and PTAB filings are prior to any district court action.
• Filers must present all eligible invalidity grounds (§§ 101, 102, 103, 112) and provide complete supporting evidence and priority claims.
• The PTAB may issue a decision up to 6 months after the initial petition, with a possible 15‑page brief response.
• Early filings preserve a PTAB appeal route; missing the deadline forfeits all PTAB recourse and reduces scheduling flexibility.
• After a final PTAB ruling, § 325(e)(2) estops the petitioner from re‑asserting the same invalidity theory in any subsequent litigation.

Why File a Post‑Grant Review?

Why pursue a post‑grant review immediately upon a patent’s issuance? Because you can lock in Legal Certainty before a filing window closes, and you seize a Competitive Edge by challenging claims on any ground under 35 U.S.C. §§ 101, 102, 103, and 112. Under the final rules, a petition cannot be filed before nine months following the patent’s issuance—no earlier filings are permitted. Post‑grant review permits you to argue non‑patentable subject matter, novelty, obviousness, written description, enablement, or indefiniteness—grounds beyond the narrow scope of inter‑parts review. By filing within the first nine months, you preempt a patent owner’s market dominance and avoid the nine‑month waiting period required for an IPR. The “more likely than not” threshold lowers your burden of proof, and the board can institute review for novel legal questions. Discovery, cross‑examination, and a trial‑like format give you robust evidentiary support, while the final written decision is immediately appealable to the Federal Circuit. Consequently, you gain legal certainty, minimize litigation costs, and preserve strategic options before the patent owner initiates litigation.

Which Patents Are Eligible for a Post‑Grant Review?

Having secured legal certainty through a post‑grant review, you now must guarantee the patent meets the statutory prerequisites. To qualify, you must focus on eligible patents that fall under the first‑inventor‑to‑file provisions of the America Invents Act, meaning the application’s effective filing date is on or after March 16 2013. The PTAB has ruled that the first‑inventor‑to‑file test is satisfied automatically for any patent issued from an application filed before 16 March 2013. These patents issue from AIA applications, and all covered claims within them are subject to review. Covered business‑method patents escape the filing‑date cutoff, but transitional patents face an uphill climb; they rarely satisfy the first‑to‑file requirement. Additionally, you need to verify your petitioner meets eligibility, must not have scored a prior IPR, PGR, or CBM that reached a final decision, and cannot have filed a civil action that undermined the same patent. Once these conditions align, you can proceed with the PGR, capitalizing on its broader grounds of challenge and the PTAB’s authority to deem the claims unpatentable.

When to File: Timing Your 9‑Month Window

Because the nine‑month window commences on the patent’s issuance or re‑issuance date, you must file your post‑grant review petition within that exact period to retain the opportunity for PTAB review. Once the 30‑day clock starts, you can file immediately; delaying reduces the board’s ability to schedule. Because a missed filing deadline eliminates PTAB recourse, you must schedule your strategy around the patent’s grant. For reissues, the nine‑month window restarts on the re‑issuance date, but broadened claims trigger a fresh period while identical or narrower claims remain bound by the original date. Your timeline strategy should hence map the earliest feasible filing, account for optional preliminary responses, and anticipate institutional decision timing of up to five months post‑response. Declining a preliminary response shortens the schedule and imposes a 12‑month deadline and transfer. Remember PTAB may issue promptly deficiency notices; correcting before the petition deadline preserves your claim and enforce. The nine‑month window imposes strict filing deadlines.

Drafting a Winning Post‑Grant Review Petition

Now that you’ve secured the filing window, focus on assembling a petition that meets every statutory and procedural requirement on the first attempt. Begin by identifying all real parties in interest and every claim you challenge. Construct each claim under the broadest reasonable interpretation, citing 35 U.S.C. §§ 101, 102, 103, 112, and specifying written‑description or enablement deficiencies. Supply prior art documents, declarations, and evidence, then explain, in detail, why each ground renders a claim unpatentable. Remember the 70‑page limit and the requirement to pay the fee before submission. Include the required standing statement and a seal request if necessary.

After filing, file the brief response within the 15‑page cap, wait for the PTAB’s institute decision, and prepare for a written decision with a 6‑month extension. The PTAB’s decision in SAP v Versata underscores the necessity of pinpointing prior‑art material limitations.

Why Estoppel Matters After Your PGR

If you see your PTAB decision on a post‑grant review (PGR) write it up, remember that § 325(e)(2) imposes a broad estoppel that will preclude you from re‑asserting any invalidity ground—including those that were merely potential or known before the petition—against the patent in district court or the International Trade Commission.

That estoppel impact bars you from raising any 102 or 103 grounds, GREE‑type arguments, or even unfiled but known prior‑art challenges that the USPTO could have considered, thereby imposing a duty of full disclosure and precludes reliance on unestablished defenses in the ITC or civil action.

Strategic defense planning must accordingly commence with a prior‑art search, mapping all invalidity theories before filing. Acknowledging the full scope of § 325(e)(2) lets you avoid inadvertent self‑estoppel, preserve the option to pursue multiple PGRs on distinct bases, and signals the PTAB and courts that you act in faith under an evidentiary framework.

PGR filings have never hit triple digits in any fiscal year.

Frequently Asked Questions

Are Post‑Grant Review Petitions Allowed After the Initial 9‑Month Period?

No, you can’t file a PGR after the nine‑month window. Your late filing falls outside 37 CFR §42.202’s 9‑month deadline, so PGR is barred. Instead, you may pursue an Inter‑Partes Review, which opens after the 9‑month period and lets you challenge claims if you reasonably suspect unpatentability. Ex parte reexamination remains available anytime, but PGR itself never extends beyond that nine‑month cut‑off. This restriction preserves prompt review and protects the post‑grant system.

Can a Party Facing an Infringement Lawsuit File a PGR?

Like a lighthouse cutting a fog, you still face strict gates: you can’t petition a PGR if an infringement suit is already underway, except for claims filed before the petition or those exempt by §325(a). Therefore, your defense strategy hinges on timing—file within nine months of issuance and before litigation, or risk automatic stay. Such procedural hurdles reshape your litigation tactics, leaving you in a tighter legal net, firmly ahead.

What Are the Consequences of a PTAB Denial of a PGR Petition?

Your PTAB denial of a PGR petition means the patent stays valid and enforceable; you’ve forfeited claims to invalidate it outright. The ruling bars you from re‑filing identical arguments under §325(d), and you lose the benefit of a trial‑on‑merits review, forcing you to dispose of resources spent on the petition. Legally, the rejection impacts your strategic options, shifting focus to IPR or litigation while preserving the owner’s expectations in practice.

How Much Is the Post‑Institution Fee for a PGR?

Your post‑institution fee totals $34,375 for up to 20 claims, per 37 CFR § 42.15(b) effective January 2025. The Fee Breakdown: $25,000 request fee, $9,375 matching post‑institution base, plus $1,315 per excess claim beyond 20. Add $595 per excess claim for the request side. This Cost Estimate yields a minimum $59,375 total, covering the entire PGR proceeding. Adjustments apply if claims are exceeded, and include attorney fees, which commonly range from $200,000 to $400,000.

Is a PGR Available for Continuation or Divisional Patents?

Yes, a post‑grant review (PGR) can target continuations and divisional patents. Under the Continuations criteria, a continuation claiming pre‑AIA priority remains eligible for PGR if its claims lack full support in the priority document. Likewise, the Divisional process allows PGR when compelled claims aren’t sufficiently described or enabled under §112. The PTAB must independently verify claim support, and the petitioner bears proof burden. You should file within the nine‑month window.

Conclusion

Remember, time is of the essence: you’re required to file within the nine‑month window to preserve your challenge. By filing a post‑grant review, you leverage arguments against the examiner’s findings, ensuring every statutory ground is examined. Your petition must articulate concrete deficiencies, cite relevant case law, and adhere to the USPTO’s procedural form. Formatting, pagination, and compliance with the PTAB’s evidence‑submission deadline are critical to sustaining your review request and ultimately unsettling the patent’s enforceability.

James Bateson

Lawyer