Updated July 2026 · 15-minute read

Guide to USPTO Information Disclosure Statements (IDS)

An Information Disclosure Statement (IDS) is the legal mechanism used to fulfill the duty of candor under 37 CFR 1.56. This guide breaks down the three filing windows under 37 CFR 1.97, common pitfalls that trigger inequitable conduct or invalidity claims, and how automation streamlines compliance.

What's in this guide

What Is an Information Disclosure Statement, and Why Does It Exist?
The Duty of Candor Under 37 CFR 1.56: A Step-by-Step Breakdown
Timelines, Deadlines, and Critical Stages: The 37 CFR 1.97 Filing Windows
Common Pitfalls That Lead to Patent Invalidity or Inequitable Conduct Claims
How Automation Turns a Multi-Hour Task Into a One-Click Task
Building an IDS Compliance Program: A Practical Checklist
Frequently Asked Questions

If you practice patent prosecution, the Information Disclosure Statement (IDS) is one of the few filings you cannot afford to get wrong. It is not optional paperwork it is the mechanism by which applicants satisfy a legal duty owed directly to the United States Patent and Trademark Office (USPTO), and getting it wrong can jeopardize the enforceability of an issued patent years after it grants. Yet for most firms, IDS preparation still looks the same as it did two decades ago: a paralegal or associate manually assembling reference lists from parent applications, foreign counterparts, litigation dockets, and inventor disclosures, then hand-checking each one against strict, unforgiving deadlines. This guide covers the duty of candor behind the IDS, the filing windows and fees that govern submission, the mistakes that most often lead to malpractice exposure or invalidity challenges, and how automation like Max-IDS is changing what “IDS preparation” means for modern firms.

What Is an Information Disclosure Statement, and Why Does It Exist?

An Information Disclosure Statement is the formal vehicle applicants use to submit prior art and other material information to a patent examiner during prosecution. It exists because U.S. patent law imposes an affirmative obligation on everyone substantively involved in prosecuting an application to disclose information they know to be material to patentability examiners do not simply trust applicants to volunteer helpful art; the system assumes they must volunteer all material art, helpful or not. The IDS itself is a relatively simple form (USPTO Forms SB/08A and SB/08B, filed together) listing U.S. patents and application publications, foreign patent documents, and non-patent literature (NPL) such as journal articles or foreign search reports. What makes it high-stakes is not the form, but the legal duty behind it and the strict timing rules that determine whether a disclosure is free, requires a fee, or requires a fee plus a sworn certification.

The Duty of Candor Under 37 CFR 1.56: A Step-by-Step Breakdown

The legal foundation for the IDS is 37 CFR 1.56, commonly called the “duty of candor and good faith” rule. Understanding it in practice means understanding three things: who owes the duty, what information the duty covers, and how long the duty lasts.

Step 1: Identify Who Owes the Duty

The duty of candor is not limited to the named inventors. Under Rule 1.56, it extends to every individual “substantively involved” in the preparation or prosecution of the application who is associated with the inventor, the assignee, or anyone else with an obligation to assign the invention. In practice, that means:

Each named inventor.
Each attorney or agent who prepares or prosecutes the application.
Every other person who is substantively involved in the preparation or prosecution of the application and who is associated with the inventor, the applicant, or an assignee (for example, in-house patent counsel, technical reviewers who draft declarations, or paralegals who compile search results with substantive input).

A common misconception is that this is “the attorney’s job.” In reality, the duty attaches individually to everyone on that list, which is exactly why inventor interviews and invention disclosure forms should always ask directly about known prior art, competitor products, related litigation, and foreign filings.

Step 2: Determine What Counts as Material Information

Rule 1.56(b) defines information as material to patentability when it is not cumulative of information already of record, and it either (1) establishes, alone or combined with other information, a prima facie case of unpatentability of a claim, or (2) refutes, or is inconsistent with, a position the applicant takes in opposing an unpatentability argument or asserting patentability. In plain terms: if a reference could reasonably change how an examiner evaluates a claim, or cuts against an argument the applicant is making to get the claim allowed, it is material and must be disclosed. There is no duty to conduct a search you have not otherwise performed, but there is an absolute duty to disclose material information you already possess whether it surfaced through an inventor interview, litigation discovery, or a foreign office’s search report.

Step 3: Understand How Long the Duty Lasts

The duty of candor is not a one-time, filing-day obligation. It continues throughout prosecution — from the filing date until the patent issues or the application is abandoned. That is precisely why IDS filings are typically a recurring compliance task rather than a single event: new material art can surface at any point, from a foreign counterpart’s office action to a newly cited reference in related litigation, and each new item triggers a fresh disclosure obligation.

Timelines, Deadlines, and Critical Stages: The 37 CFR 1.97 Filing Windows

While Rule 1.56 defines the duty, 37 CFR 1.97 governs the mechanics of when an IDS can be filed and what it costs. Practitioners generally think of prosecution as moving through three sequential IDS windows, each with different requirements.

Window (a): The Free, No-Strings-Attached Window

An IDS filed within three months of the application’s filing date, or before the mailing of a first Office Action on the merits whichever is later requires no fee and no certification statement. This is the cheapest and simplest window, and it is why front-loading prior art collection (family references, inventor-known art, related foreign filings) as early as possible is a best practice, not just a courtesy to the examiner.

Window (b): After the Early Window, Before Final Disposition

Once window (a) closes but before a final Office Action, a Notice of Allowance, or a Quayle action an IDS can still be filed, but it now requires either the fee under 37 CFR 1.17(p), or a certification statement under 37 CFR 1.97(e). The certification is a sworn statement that either (1) each item of information was first cited by a foreign patent office in a counterpart application no more than three months before the IDS was filed, or (2) no item was cited by a foreign office and none was known to anyone with a duty to disclose more than three months before filing. In short: disclose promptly after learning of a reference, and you can certify instead of paying.

Window (c): After Final Action or Allowance, Before the Issue Fee

After a final Office Action, a Notice of Allowance, or a Quayle action but before the issue fee is paid an IDS can still be entered, but only with both the 1.17(p) fee and the 1.97(e) certification together. This is the most restrictive window, and where firms most often stumble: submitting only the fee or only the certification, not realizing that this late in prosecution the rule requires both. After the issue fee is paid, an IDS generally cannot be entered at all; options narrow to a Request for Continued Examination, a continuation application, or the narrow Quick Path IDS (QPIDS) pilot.

The Three Windows at a Glance

Window (a): Within 3 months of filing, or before the first Office Action on the merits, whichever is later no fee, no certification.
Window (b): After window (a) closes, but before final action, allowance, or a Quayle action — fee under 37 CFR 1.17(p), OR a 1.97(e) certification.
Window (c): After final action, allowance, or a Quayle action, but before the issue fee is paid fee under 37 CFR 1.17(p) AND a 1.97(e) certification, both required.

Common Pitfalls That Lead to Patent Invalidity or Inequitable Conduct Claims

The consequences of getting IDS practice wrong are not merely administrative. A mishandled IDS can become the centerpiece of a later invalidity defense or an inequitable conduct charge — one of the few doctrines in patent law that can render an entire patent, and sometimes a whole portfolio, unenforceable. Since the Federal Circuit’s en banc decision in Therasense, Inc. v. Becton, Dickinson & Co., proving inequitable conduct requires clear and convincing evidence of both but-for materiality (the patent would not have issued, or not in that form, had the examiner known the reference) and specific intent to deceive the USPTO. That is a high bar, but litigators clear it more often than firms would like, almost always by pointing to gaps in IDS practice. The most common pitfalls:

1. Missing a Known Reference

The most damaging pitfall: an inventor, attorney, or agent who knew about a material reference simply did not disclose it. This often happens when prior art surfaces in a foreign counterpart’s search report, in litigation over a related patent, or in an inventor’s own files, and never makes it into the U.S. record because no one owns the job of monitoring those sources systematically.

2. Blowing a Filing Window

Filing an IDS in window (b) or (c) without the correct fee, certification, or both when both are required risks having the disclosure refused entry meaning the reference is treated as though it was never disclosed. Miscalculating which window an application currently sits in, a common error when several related applications are managed in parallel, is one of the most frequent causes.

3. Incomplete or Careless Disclosure

Disclosing a reference is not the same as disclosing it completely. Common gaps include submitting an English abstract without disclosing that a fuller foreign-language reference exists, listing only a curated subset of NPL citations from a foreign search report, or failing to carry forward parent-cited references into a continuation’s IDS record when they remain material. Each can later be characterized as selective, rather than complete, disclosure.

4. Treating the IDS as a One-Time Task

Because the duty of candor runs through the life of prosecution, firms that treat the IDS as a single filing-day checkbox rather than an ongoing docketing obligation tied to every incoming foreign action, litigation event, and new continuation are the ones most likely to miss a later-arising reference.

How Automation Turns a Multi-Hour Task Into a One-Click Task

Manually preparing a compliant IDS package is deceptively labor-intensive. A single filing typically requires a paralegal to pull the family tree of related applications and identify what is already of record; cross-reference foreign counterpart histories for newly cited art; deduplicate overlapping reference lists; verify that each foreign document or NPL item has an available copy where required; populate USPTO Form SB/08 correctly; determine which 37 CFR § 1.97 filing window applies; and confirm the cumulative reference count against the 37 CFR § 1.17(v) IDS size-fee thresholds. Done manually, this routinely takes several hours per filing and every step presents an opportunity for a missed reference, filing deadline, or fee-related oversight.

Max-IDS streamlines this entire workflow into a single action. It automatically aggregates citations from family applications, foreign counterpart office actions, and prior IDS filings; deduplicates them against what is already of record; determines the applicable 37 CFR § 1.97 filing window based on the application’s prosecution timeline; maintains the cumulative applicant-cited reference count; and notifies users when fees under 37 CFR §§ 1.17(p) and 1.17(v) may apply. It also generates an EFS-Web-ready filing package, transforming a multi-hour compilation exercise into a streamlined, audit-ready process. For firms managing high-volume patent portfolios, the result is fewer missed deadlines, fewer filing errors, greater operational efficiency, and a defensible, time-stamped record of what was known and when valuable evidence in the event of a future inequitable conduct challenge.

Building an IDS Compliance Program: A Practical Checklist

Whether or not your firm has moved to automation, a defensible IDS practice generally rests on the same fundamentals:

Ask every inventor directly, in writing, about known prior art including competitor products, publications, and related litigation at the outset and at every substantive interview.
Docket a recurring IDS review tied to every incoming foreign Office Action in a corresponding application, not just to domestic prosecution events.
Track the applicable 37 CFR 1.97 window for every pending matter, and recalculate it every time a new Office Action, allowance, or Quayle action is mailed.
Maintain a running, cumulative count of applicant-cited references per application to anticipate 37 CFR 1.17(v) size-fee tiers before they are triggered.
Exclude references already cited by a parent application from that cumulative count where appropriate, rather than double-counting them.
Retain a clear, time-stamped internal record of when each reference became known to the firm this record is often the single best defense against a later inequitable conduct allegation.

Frequently Asked Questions

What is an Information Disclosure Statement (IDS) in patent prosecution?

An Information Disclosure Statement (IDS) is a formal submission to the USPTO, filed on Forms SB/08A and SB/08B, through which applicants and their representatives disclose prior art and other information material to the patentability of a pending patent application, satisfying the duty of candor imposed by 37 CFR 1.56.

What is the deadline to file an IDS with the USPTO?

There is no single deadline instead, 37 CFR 1.97 creates three windows. An IDS filed within three months of the filing date or before the first Office Action on the merits (whichever is later) is free. After that but before a final action, allowance, or Quayle action, it requires a fee or a certification. After a final action, allowance, or Quayle action but before the issue fee is paid, it requires both a fee and a certification.

Does filing an IDS after a final Office Action require a fee?

Yes. Once an application has reached a final Office Action, a Notice of Allowance, or a Quayle action, any IDS filed before the issue fee is paid must include both the fee under 37 CFR 1.17(p) and a certification statement under 37 CFR 1.97(e) one alone is not sufficient at this stage.

What happens if a material reference is never disclosed to the USPTO?

Failing to disclose a known material reference can support a later claim of inequitable conduct, which under the Federal Circuit’s Therasense standard requires clear and convincing evidence that the reference was but-for material to patentability and that the individual withholding it acted with specific intent to deceive the USPTO. If proven, inequitable conduct can render the entire patent and in some cases related patents unenforceable.

Can an IDS still be filed after the issue fee has been paid?

Generally, no. Once the issue fee is paid, an IDS can no longer be entered into that application through the standard 37 CFR 1.97 process. Applicants must instead pursue a Request for Continued Examination, a continuation application, or the narrow Quick Path IDS (QPIDS) pilot procedure to bring the new information onto the record.