MPEP § 2000.01 — Introduction (Annotated Rules)

§2000.01 Introduction

USPTO MPEP version: BlueIron's Update: 2026-01-10

This page consolidates and annotates all enforceable requirements under MPEP § 2000.01, including statutory authority, regulatory rules, examiner guidance, and practice notes. It is provided as guidance, with links to the ground truth sources. This is information only, it is not legal advice.

Introduction

This section addresses Introduction. Primary authority: 35 U.S.C. 116, 35 U.S.C. 251, and 35 U.S.C. 256. Contains: 1 permission and 6 other statements.

Key Rules

Topic

Individuals Under Duty

2 rules
StatutoryInformativeAlways
[mpep-2000-01-1595ff9466c4466234798c4f]
Duty to Disclose Material Information to USPTO
Note:
Individuals involved in patent applications must disclose all material information known to them regarding patentability.

This Chapter deals with the duties owed toward the U.S. Patent and Trademark Office by each individual who is associated with the preparation or prosecution of the application. Each individual associated with the filing and prosecution of a patent application, supplemental examination, or patent reexamination has a duty to disclose to the Office all information known to that individual to be material to patentability as defined in this section. These duties, of candor and good faith and disclosure, have been codified in 37 CFR 1.56 and 37 CFR 1.555, as promulgated pursuant to carrying out the duties of the Director under Sections 2, 3, 131, and 132 of Title 35 of the United States Code.

Jump to MPEP Source · 37 CFR 1.56Individuals Under DutyTiming of DutyScope of Duty
StatutoryInformativeAlways
[mpep-2000-01-3ad6ddee435f9f2694076807]
Duty to Disclose Material Information
Note:
Each individual associated with a patent application must disclose all material information known to them regarding patentability.

This Chapter deals with the duties owed toward the U.S. Patent and Trademark Office by each individual who is associated with the preparation or prosecution of the application. Each individual associated with the filing and prosecution of a patent application, supplemental examination, or patent reexamination has a duty to disclose to the Office all information known to that individual to be material to patentability as defined in this section. These duties, of candor and good faith and disclosure, have been codified in 37 CFR 1.56 and 37 CFR 1.555, as promulgated pursuant to carrying out the duties of the Director under Sections 2, 3, 131, and 132 of Title 35 of the United States Code.

Jump to MPEP Source · 37 CFR 1.56Individuals Under DutyScope of DutyTiming of Duty
Topic

But-For Materiality (Therasense)

2 rules
StatutoryInformativeAlways
[mpep-2000-01-fb243874128ed2df7d338320]
But-For Materiality for Duty of Disclosure
Note:
Proposes revisions to the materiality standard for patent applications and reexamination proceedings based on Therasense decision, aligning with 'but-for' materiality for inequitable conduct.

On October 28, 2016, the Office issued a Notice of Proposed Rulemaking proposing revisions to the materiality standard for the duty to disclose information in patent applications and reexamination proceedings (duty of disclosure) in light of the decision by the U.S. Court of Appeals for the Federal Circuit (Federal Circuit) in Therasense, Inc. v. Becton, Dickinson & Co., 649 F.3d 1276, 1288, 99 USPQ2d 1065 (Fed. Cir. 2011)(en banc). Specifically, the Office is considering harmonizing the materiality standard for the duty of disclosure to adopt the “but-for” materiality standard for inequitable conduct as set forth in Therasense and adopted in subsequent inequitable conduct cases, which will result in revisions to 37 CFR 1.56 and 37 CFR 1.555. While these proposed rule changes have not yet been finalized, it is still important for Office stakeholders to recognize the split in how materiality may be considered within the Office and in the courts. Some of the more instructive recent cases on inequitable conduct have been incorporated in the discussion below to provide guidance on compliance with the duty of disclosure regardless of the materiality standard.

Jump to MPEP Source · 37 CFR 1.56But-For Materiality (Therasense)Elements of Inequitable ConductMateriality Standard
StatutoryInformativeAlways
[mpep-2000-01-651907fee4bd7c72187da754]
But-For Materiality for Duty of Disclosure
Note:
Adopting the 'but-for' materiality standard from Therasense for the duty to disclose information in patent applications and reexamination proceedings.

On October 28, 2016, the Office issued a Notice of Proposed Rulemaking proposing revisions to the materiality standard for the duty to disclose information in patent applications and reexamination proceedings (duty of disclosure) in light of the decision by the U.S. Court of Appeals for the Federal Circuit (Federal Circuit) in Therasense, Inc. v. Becton, Dickinson & Co., 649 F.3d 1276, 1288, 99 USPQ2d 1065 (Fed. Cir. 2011)(en banc). Specifically, the Office is considering harmonizing the materiality standard for the duty of disclosure to adopt the “but-for” materiality standard for inequitable conduct as set forth in Therasense and adopted in subsequent inequitable conduct cases, which will result in revisions to 37 CFR 1.56 and 37 CFR 1.555. While these proposed rule changes have not yet been finalized, it is still important for Office stakeholders to recognize the split in how materiality may be considered within the Office and in the courts. Some of the more instructive recent cases on inequitable conduct have been incorporated in the discussion below to provide guidance on compliance with the duty of disclosure regardless of the materiality standard.

Jump to MPEP Source · 37 CFR 1.56But-For Materiality (Therasense)Elements of Inequitable ConductMateriality Standard
Topic

Elements of Inequitable Conduct

2 rules
StatutoryPermittedAlways
[mpep-2000-01-ff41c713f2722dc470868e02]
Materiality Consideration Split Within Office and Courts
Note:
Office stakeholders must recognize the differing views on materiality in patent applications and reexamination proceedings, regardless of proposed rule changes.

On October 28, 2016, the Office issued a Notice of Proposed Rulemaking proposing revisions to the materiality standard for the duty to disclose information in patent applications and reexamination proceedings (duty of disclosure) in light of the decision by the U.S. Court of Appeals for the Federal Circuit (Federal Circuit) in Therasense, Inc. v. Becton, Dickinson & Co., 649 F.3d 1276, 1288, 99 USPQ2d 1065 (Fed. Cir. 2011)(en banc). Specifically, the Office is considering harmonizing the materiality standard for the duty of disclosure to adopt the “but-for” materiality standard for inequitable conduct as set forth in Therasense and adopted in subsequent inequitable conduct cases, which will result in revisions to 37 CFR 1.56 and 37 CFR 1.555. While these proposed rule changes have not yet been finalized, it is still important for Office stakeholders to recognize the split in how materiality may be considered within the Office and in the courts. Some of the more instructive recent cases on inequitable conduct have been incorporated in the discussion below to provide guidance on compliance with the duty of disclosure regardless of the materiality standard.

Jump to MPEP Source · 37 CFR 1.56Elements of Inequitable ConductMateriality StandardBut-For Materiality (Therasense)
StatutoryInformativeAlways
[mpep-2000-01-e633fc26e53ca1ffdf63eb2c]
Guidance on Compliance with Duty of Disclosure Regardless of Materiality Standard
Note:
Provides guidance for compliance with the duty to disclose information in patent applications and reexamination proceedings, regardless of the materiality standard.

On October 28, 2016, the Office issued a Notice of Proposed Rulemaking proposing revisions to the materiality standard for the duty to disclose information in patent applications and reexamination proceedings (duty of disclosure) in light of the decision by the U.S. Court of Appeals for the Federal Circuit (Federal Circuit) in Therasense, Inc. v. Becton, Dickinson & Co., 649 F.3d 1276, 1288, 99 USPQ2d 1065 (Fed. Cir. 2011)(en banc). Specifically, the Office is considering harmonizing the materiality standard for the duty of disclosure to adopt the “but-for” materiality standard for inequitable conduct as set forth in Therasense and adopted in subsequent inequitable conduct cases, which will result in revisions to 37 CFR 1.56 and 37 CFR 1.555. While these proposed rule changes have not yet been finalized, it is still important for Office stakeholders to recognize the split in how materiality may be considered within the Office and in the courts. Some of the more instructive recent cases on inequitable conduct have been incorporated in the discussion below to provide guidance on compliance with the duty of disclosure regardless of the materiality standard.

Jump to MPEP Source · 37 CFR 1.56Elements of Inequitable ConductMateriality StandardInequitable Conduct and Fraud
Topic

Duty of Disclosure Fundamentals

1 rules
StatutoryInformativeAlways
[mpep-2000-01-b2b64263a96b12e9e975779e]
Duty to Disclose Material Information
Note:
Individuals associated with patent applications must disclose all material information known to them regarding patentability.

This Chapter deals with the duties owed toward the U.S. Patent and Trademark Office by each individual who is associated with the preparation or prosecution of the application. Each individual associated with the filing and prosecution of a patent application, supplemental examination, or patent reexamination has a duty to disclose to the Office all information known to that individual to be material to patentability as defined in this section. These duties, of candor and good faith and disclosure, have been codified in 37 CFR 1.56 and 37 CFR 1.555, as promulgated pursuant to carrying out the duties of the Director under Sections 2, 3, 131, and 132 of Title 35 of the United States Code.

Jump to MPEP Source · 37 CFR 1.56Duty of Disclosure FundamentalsDuty of DisclosureIndividuals Under Duty
Topic

Material Information Definition

1 rules
StatutoryPermittedAlways
[mpep-2000-01-3d6462faaaea39d651f433d2]
Duty to Correct Erroneous Material Information in Record
Note:
The duty of disclosure requires correcting any erroneous material information found in the patent record, without needing to prove deceptive intent.

In some instances, the duty to disclose may constitute correcting erroneous material information in the record. Effective September 16, 2012, the America Invents Act (AIA) amended the patent laws to modify notable aspects of the duty of disclosure. Specifically, the AIA eliminated the requirement that applicants disclose that an error in a patent (e.g., change in inventorship) was made without any deceptive intent before correction is permitted. See 35 U.S.C. 116, 35 U.S.C. 251, and 35 U.S.C. 256. This does not negate, however, the continuing obligation to practice candor and good faith in all dealings before the Office.

Jump to MPEP SourceMaterial Information DefinitionDuty of Disclosure in ReissueMateriality Standard
Topic

AIA Effective Dates

1 rules
StatutoryInformativeAlways
[mpep-2000-01-edee76c7af453ca041b2423b]
Amended Duty of Disclosure Under AIA
Note:
The America Invents Act amended the patent laws to modify the duty of disclosure, eliminating the requirement for deceptive intent when correcting errors in a patent.

In some instances, the duty to disclose may constitute correcting erroneous material information in the record. Effective September 16, 2012, the America Invents Act (AIA) amended the patent laws to modify notable aspects of the duty of disclosure. Specifically, the AIA eliminated the requirement that applicants disclose that an error in a patent (e.g., change in inventorship) was made without any deceptive intent before correction is permitted. See 35 U.S.C. 116, 35 U.S.C. 251, and 35 U.S.C. 256. This does not negate, however, the continuing obligation to practice candor and good faith in all dealings before the Office.

Jump to MPEP SourceAIA Effective DatesDuty of Disclosure in ReissueAIA Overview and Effective Dates
Topic

Rejections Specific to Reissue

1 rules
StatutoryPermittedAlways
[mpep-2000-01-7ec067b15a775b1451ac9721]
No Deceptive Intent Required for Correction
Note:
Applicants are no longer required to disclose that an error was made without deceptive intent before correction is permitted, but must still practice candor and good faith in all dealings with the Office.

In some instances, the duty to disclose may constitute correcting erroneous material information in the record. Effective September 16, 2012, the America Invents Act (AIA) amended the patent laws to modify notable aspects of the duty of disclosure. Specifically, the AIA eliminated the requirement that applicants disclose that an error in a patent (e.g., change in inventorship) was made without any deceptive intent before correction is permitted. See 35 U.S.C. 116, 35 U.S.C. 251, and 35 U.S.C. 256. This does not negate, however, the continuing obligation to practice candor and good faith in all dealings before the Office.

Jump to MPEP SourceRejections Specific to ReissueAIA vs Pre-AIA PracticeReissue Patent Practice

Citations

Primary topicCitation
AIA Effective Dates
Material Information Definition
Rejections Specific to Reissue
35 U.S.C. § 116
AIA Effective Dates
Material Information Definition
Rejections Specific to Reissue
35 U.S.C. § 251
AIA Effective Dates
Material Information Definition
Rejections Specific to Reissue
35 U.S.C. § 256
But-For Materiality (Therasense)
Duty of Disclosure Fundamentals
Elements of Inequitable Conduct
Individuals Under Duty
37 CFR § 1.555
But-For Materiality (Therasense)
Duty of Disclosure Fundamentals
Elements of Inequitable Conduct
Individuals Under Duty
37 CFR § 1.56

Source Text from USPTO’s MPEP

This is an exact copy of the MPEP from the USPTO. It is here for your reference to see the section in context.

BlueIron Last Updated: 2026-01-10