PTABProcedureAIA trials

PTAB Trial Practice Guide: what it contains

By Ipiry TeamPublished August 25, 202612 min read

Short answer

The Trial Practice Guide is the USPTO's explanation of how AIA proceedings actually run — the procedures, expectations and formats the rules do not spell out. It covers petition and response requirements, word limits, discovery, expert testimony, motions to amend, and hearings. It is guidance rather than binding law, so precedential decisions and the rules themselves govern where they conflict, and the Guide has been updated repeatedly.

The PTAB Trial Practice Guide explains how AIA proceedings actually run.

The statute says what may be filed. The rules say the formal requirements. The Guide describes the expectations in between — what the Board wants to see, how evidence is treated, what happens at each stage.

It is guidance, not law. The rules govern, and precedential decisions bind panels, so where they differ the Guide yields.

Which makes it necessary and insufficient. You need it to file competently and it will not tell you the current position on discretionary denial.

What it covers

Area	Addressed
Petition requirements	Content, format, supporting evidence
Preliminary response	Scope and timing
Institution	What the Board considers
Discovery	Routine and additional
Expert testimony	Expectations for declarations
Motions practice	Types and standards
Motions to amend	Requirements and process
Protective orders	Confidential information
Oral hearing	Requesting, demonstratives, conduct
Settlement	Terminating proceedings
Word limits and formatting	By filing type

What it does not cover

Not covered	Where it lives
Current discretionary denial framework	Precedential decisions, Director review
Ex parte reexamination	Separate procedure entirely
District court practice	Court rules
Substantive patent law	Statute and case law
Current institution rates	Board statistics, dated

Discretionary denial is the important omission. It determines whether a petition is considered on its merits at all, and the framework has moved substantially through decisions rather than through the Guide.

The proceedings it applies to

Proceeding	Grounds	Who can file
Inter partes review	§102 and §103 on patents and printed publications only	Anyone but the owner
Post-grant review	Any invalidity ground, within 9 months of grant	Anyone but the owner
Derivation	Wrong inventor derived the invention	An applicant

IPR is the common one and the most limited in grounds. It cannot raise §101 eligibility or §112 written description, which is why some challenges belong in court instead.

PGR has a nine-month window from grant and is unavailable afterwards. See inter partes review.

Petition expectations

Requirement	Detail
Identify each claim challenged	And each ground per claim
Specify where each element is found	In the prior art, precisely
Claim construction positions	Where terms are disputed
Supporting evidence filed with it	Exhibits, declarations
Real party in interest	Identified — errors are consequential
Word limit compliance	Set by rule
Fees	Filing, plus post-institution

Real party in interest errors are serious. Misidentification can affect standing and estoppel, and it is litigated regularly.

The petition is the case. Deficiencies cannot generally be cured by later filings, because the Board evaluates institution on what was filed.

Expert testimony

Weight given	Characteristic
High	Explains the reasoning, cites underlying facts
High	Addresses the level of skill in the art
Low	Conclusory assertions
Low	Repeats the petition without analysis
None	Opinions outside the declarant's expertise

Conclusory declarations are a recurring failure. A declaration stating that a skilled person would have combined two references, without explaining why, adds little to a petition.

Cross-examination of declarants is routine discovery, so a declaration that cannot be defended in deposition is a liability rather than support.

Evidence and exhibits

Requirement	Detail
Exhibit numbering	Petitioner and patent owner use separate ranges
Objections to evidence	Served, then motions to exclude
Supplemental information	By motion, within time limits
Translations	Certified, for foreign-language art
Testimony	Declaration form, subject to cross-examination

Foreign-language prior art needs certified translation. A machine translation is not sufficient for a proceeding, though it is fine for the searching that found the document. See Chinese patentability search.

Objections must be preserved. Evidence not objected to at the right point is generally treated as admitted.

Discovery is narrow

Type	Availability
Routine	Exhibits cited, cross-examination of declarants, inconsistent information
Additional	By motion, demanding standard
District court style	Not available

Proceedings run on the record as filed. That is a deliberate design choice supporting the statutory timeline, and it means a case has to be built before filing rather than developed afterwards.

Inconsistent information is an affirmative obligation. A party must serve information inconsistent with a position it advances.

Word limits and format

Filing	Limit set by
Petition	Rule, by proceeding type
Patent owner preliminary response	Rule
Patent owner response	Rule
Reply and sur-reply	Lower limits
Motions	Separate limits

Limits are word counts, not page counts, and they are set by rule rather than by the Guide. Because they have changed, verify the current figures directly rather than working from a remembered number.

Claim charts and certain material may be excluded from the count, but using charts to evade limits by embedding argument in them draws objections.

The timeline

Stage	Approximate timing
Petition filed	Day 0
Preliminary response	~3 months
Institution decision	~6 months
Patent owner response	After institution
Petitioner reply	Following
Sur-reply	Following
Oral hearing	Before the deadline
Final written decision	~12 months from institution

The statutory deadline drives everything. A final decision within twelve months of institution, extendable in limited circumstances, is what makes the schedule tight and discovery narrow.

Parallel district court trial dates interact with this, which is why scheduling orders matter to petition timing. See patent litigation updates.

Settlement

Point	Detail
Parties may settle	At any stage
Termination is not automatic	The Board may proceed anyway
Written agreement	Must be filed
Confidential treatment	Available on request
After a final decision	Settlement does not undo it

The Board can continue after settlement. Where a proceeding has advanced substantially and the public interest in resolving patentability is engaged, it may issue a decision regardless.

That asymmetry matters to petitioners. Filing creates a proceeding you cannot always stop.

Motions to amend

Requirement	Detail
Reasonable number of substitute claims	Typically one per challenged claim
No broadening	Substitutes must not enlarge scope
Written description support	From the original disclosure
Responsive to a ground of unpatentability	Not free redrafting
Preliminary guidance	Available under a pilot programme

Preliminary guidance changed the dynamics. A patent owner can learn the Board's initial view of a proposed amendment before committing fully, which was not previously possible.

Amendments still surrender scope permanently. A narrowed substitute claim carries the same estoppel consequences as a prosecution amendment.

Oral hearing

Point	Detail
Must be requested	Not automatic
No new evidence or argument	The record is closed
Demonstratives	Exchanged in advance, objections possible
Purpose	Argue what is already filed
Panel questions	Frequently the substance of the hearing

Arguments not in the papers are not made at the hearing. The hearing clarifies the record rather than extending it, which surprises litigators used to district court.

Protective orders

Point	Detail
Proceedings are public by default	Filings are visible
Confidential material	Motion to seal required
Default protective order	Available as a starting point
Expunged versus sealed	Different outcomes
At final decision	Sealed material may be addressed

Default publicity surprises parties used to district court. Filing something confidential without moving to seal makes it public.

Worked example: two petitions

Same prior art, same patent family, different preparation.

	Petition A	Petition B
Element-by-element mapping	Complete	Partial on two claims
Expert declaration	Reasoned, with facts	Conclusory
Motivation to combine	Argued explicitly	Asserted
Real party in interest	Fully identified	Incomplete
Claim construction	Positions stated	Silent on a disputed term
Outcome	Instituted	Denied

The prior art was identical. The difference was entirely in how the petition was built.

The conclusory declaration was the largest single problem. Without a reasoned explanation of why a skilled person would combine the references, the obviousness case was an assertion.

Incomplete RPI identification is avoidable and expensive, because it raises questions the Board must resolve before reaching the merits.

Multiple petitions on one patent

Situation	Treatment
Parallel petitions filed together	Ranking may be required
Serial petitions after a first	Heavily scrutinised
Follow-on by a related party	Real party in interest matters
Joinder to an existing proceeding	Time-limited

A second petition needs justification. Filing again after learning from a first denial is the pattern the Board treats most sceptically.

Rank parallel petitions if you file several. Leaving the Board to choose rarely helps the petitioner.

Estoppel consequences

Proceeding	Estoppel
IPR reaching final written decision	Grounds raised or reasonably could have been raised
Applies in	District court, ITC, and the USPTO
Not instituted	No estoppel from a denied petition
Settled before decision	Generally none

Estoppel is the price of a final written decision. A petitioner who loses gives up invalidity grounds it could have raised, in every other forum.

Which makes the decision to file strategic rather than tactical. See inter partes review.

Claim construction at the Board

Point	Detail
Standard	Same as district court — Phillips
Change from earlier practice	Broadest reasonable interpretation was used previously
Effect	Aligns Board and court constructions
Disputed terms	Should be identified in the petition
Silence on a disputed term	Weakens the petition

The standards were aligned deliberately. Using the same construction standard as district court reduces the risk of a claim being read one way at the Board and another in parallel litigation.

Identify disputed terms in the petition. A petition silent on a term the patent owner will contest leaves the Board to resolve it without your position. See claim construction.

Guidance versus binding authority

Source	Status
Statute	Binding
Rules	Binding
Precedential decisions	Binding on panels
Informative decisions	Guidance
Trial Practice Guide	Guidance
Routine decisions	Bind the parties only

Check the precedential list alongside the Guide. Both are free on the USPTO site, and a decision designated after the Guide's last revision governs where they differ.

Designations change, so a decision cited as precedential in an article may have been superseded. See PTAB precedential decisions.

Institution rates move

Period	Approximate institution rate
October 2024	~65%
February 2026	~37%

Always attach a date to any institution figure. The discretionary denial framework has shifted substantially, and an undated rate is close to meaningless.

Neither figure comes from the Guide. Practice statistics live in Board reporting, and they change faster than any published guidance.

Before filing a petition at all

Check	Why
Is the patent in force?	58.6% are abandoned before term
Is a PGR window still open?	Nine months from grant
Is there parallel litigation?	Timing drives discretion
Are the grounds available in IPR?	§101 and §112 are not
Estoppel consequences	What you lose by filing

Ipiry Patent Survival Curve v1.0	Rate
Survive the 3.5-year fee (2022 cohort)	85.8%
Survive the 7.5-year fee (2018 cohort)	64.6%
Reach full term (2014 cohort)	41.4%

Computed from 27,273,654 USPTO maintenance fee records covering 8,262,336 US utility patents — see the patent survival curve.

A lapsed patent needs no petition. Three minutes in Patent Center before committing to a proceeding costing hundreds of thousands.

Common procedural failures

Failure	Consequence
Incomplete real party in interest	Raises threshold issues
Conclusory expert declaration	Little weight given
Exceeding word limits	Filing problems
Grounds not mapped element by element	Institution denied
Raising §101 or §112 in an IPR	Not available
New argument at the hearing	Disregarded
Missing objection deadlines	Evidence admitted

Element-by-element mapping is not optional. A petition asserting that a reference discloses the invention, without showing where each element appears, has not made the case.

Using the Guide

Practice	Why
Read the current published version	It has been revised repeatedly
Use it for format and expectations	That is what it is for
Check precedent for substance	Especially discretionary denial
Do not cite it as binding	It is guidance
Cross-check rules for limits	Word counts are set by rule

PTAB Trial Practice Guide: the checklist

Use it for procedure and expectations, not for substantive law.
Read the current version. It has been revised several times.
Check precedential decisions alongside it. They bind where the Guide does not.
Do not look here for discretionary denial. That framework lives in decisions.
Build the whole case into the petition. Discovery will not fill gaps.
Make expert declarations reasoned, never conclusory.
Identify the real party in interest completely.
Verify word limits against the rules, which set them.
Expect no new argument at the hearing. The record closes before it.
Check the patent is in force before any of this.

Common questions

What is the PTAB Trial Practice Guide?

The USPTO's published explanation of how AIA trial proceedings run in practice — expectations for petitions, responses, evidence, discovery and hearings. It fills the space between the statutory rules and what actually happens in a proceeding.

Is it binding?

No. It is guidance. The statute and the rules govern, and precedential Board decisions bind panels. Where the Guide and a precedential decision differ, the decision controls, which is why both need checking.

What proceedings does it cover?

AIA trials — inter partes review, post-grant review, and derivation proceedings. It does not cover ex parte reexamination, which follows a different procedure entirely and is not a trial.

What are the word limits?

Petitions and patent owner responses are subject to word limits set by rule rather than page counts, with different limits by proceeding type. Because these are set by rule and have changed, the current figures should be checked directly rather than recalled.

What does it say about expert testimony?

That declarations should explain the reasoning rather than assert conclusions. Testimony giving a conclusion without underlying facts and analysis is given little weight, which is a recurring theme across Board decisions.

What discovery is available?

Far less than in district court. Routine discovery covers exhibits cited, cross-examination of declarants, and inconsistent information. Additional discovery requires a motion meeting a demanding standard, so proceedings run on the record as filed.

How do motions to amend work?

A patent owner may move to substitute claims, subject to requirements about scope and support. The Guide addresses the process, and a pilot programme has offered preliminary guidance on proposed amendments, which changes the practical dynamics.

Does it address discretionary denial?

It addresses procedural aspects, but discretionary denial practice is driven primarily by precedential decisions and Director review, which have moved substantially. The Guide is the wrong place to look for the current position on that.

How often is it updated?

It has been revised and consolidated several times since AIA proceedings began. Because updates matter and the version history is real, use the current published version rather than a copy or a summary.

Does it apply to parallel litigation?

It addresses how the Board handles proceedings where district court litigation is running alongside, including stipulations and timing considerations. The substantive framework, though, comes from precedential decisions.

What about the oral hearing?

The Guide covers requesting one, timing, demonstratives and the expectation that no new evidence or argument is introduced. Hearings argue the existing record rather than adding to it.

Where do I find it?

On the USPTO's PTAB pages, alongside the rules and the list of precedential and informative decisions. All are free, and the USPTO's published version is the authoritative one.

PTAB: the Patent Trial and Appeal Board

What the PTAB is, the proceedings it hears, who the judges are, how a trial runs, what it costs, and why institution rates have moved so sharply.

Inter partes review: what an IPR is and when to file one

IPR is the PTAB proceeding to cancel patent claims over prior art. The one-year bar, the institution decision, what estoppel costs you, and why institution rates have collapsed.

PTAB precedential decisions: how the precedent works

How PTAB decisions become binding — the designation process, informative versus precedential, Director review, and where to find what currently governs.

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