MPEP § 1448 — Fraud, Inequitable Conduct, or Duty of Disclosure Issues (Annotated Rules)

§1448 Fraud, Inequitable Conduct, or Duty of Disclosure Issues

USPTO MPEP version: BlueIron's Update: 2025-12-31

This page consolidates and annotates all enforceable requirements under MPEP § 1448, 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.

Fraud, Inequitable Conduct, or Duty of Disclosure Issues

This section addresses Fraud, Inequitable Conduct, or Duty of Disclosure Issues. Primary authority: 37 CFR 1.56. Contains: 1 requirement, 7 guidance statements, 1 permission, and 6 other statements.

Key Rules

Topic

Duty of Disclosure Fundamentals

6 rules
StatutoryInformativeAlways
[mpep-1448-80a9712fe45680dcaabbe912]
Identify Where Fraud Determination Is Set Forth
Note:
Specify the exact location in the court's opinion where fraud, inequitable conduct, or duty of disclosure violation is determined.

4. In bracket 4, point out where in the opinion (or holding) of the Court or administrative body the determination of fraud, inequitable conduct or violation of duty of disclosure is set forth. Page number, column number, and paragraph information should be given as to the opinion (or holding) of the Court or administrative body. The examiner may add explanatory comments.

35 U.S.C.Duty of Disclosure FundamentalsInequitable Conduct and FraudDuty of Disclosure
StatutoryRecommendedAlways
[mpep-1448-3c05f00f31eb7d5ed8fc50de]
Requirement for Determining Fraud, Inequitable Conduct, or Duty of Disclosure Violations
Note:
The rule requires the examiner to identify where in the opinion of the Court or administrative body fraud, inequitable conduct, or a violation of the duty of disclosure is determined.

4. In bracket 4, point out where in the opinion (or holding) of the Court or administrative body the determination of fraud, inequitable conduct or violation of duty of disclosure is set forth. Page number, column number, and paragraph information should be given as to the opinion (or holding) of the Court or administrative body. The examiner may add explanatory comments.

35 U.S.C.Duty of Disclosure FundamentalsInequitable Conduct and FraudDuty of Disclosure
StatutoryPermittedAlways
[mpep-1448-d945f5675a39aba6423d78cf]
Examiner May Add Comments on Fraud Determination
Note:
The examiner is permitted to provide additional comments regarding the determination of fraud, inequitable conduct, or violation of the duty of disclosure in the opinion or holding of the Court or administrative body.

4. In bracket 4, point out where in the opinion (or holding) of the Court or administrative body the determination of fraud, inequitable conduct or violation of duty of disclosure is set forth. Page number, column number, and paragraph information should be given as to the opinion (or holding) of the Court or administrative body. The examiner may add explanatory comments.

35 U.S.C.Duty of Disclosure FundamentalsInequitable Conduct and FraudDuty of Disclosure
MPEP GuidanceRequiredAlways
[mpep-1448-4217d528208fc68ebb3e4345]
Explicit Admission Required for Fraud, Inequitable Conduct, or Duty of Disclosure Violation
Note:
Any admission of fraud, inequitable conduct, or violation of the duty of disclosure must be clearly stated and not open to other interpretations.

Any admission of fraud, inequitable conduct or violation of the duty of disclosure must be explicit, unequivocal, and not subject to other interpretation. Where a rejection is made based upon such an admission (see form paragraph 14.22.fti below) and applicant responds with any reasonable interpretation of the facts that would not lead to a conclusion of fraud, inequitable conduct or violation of the duty of disclosure, the rejection should be withdrawn. Alternatively, if applicant argues that the admission noted by the examiner was not in fact an admission, the rejection should also be withdrawn.

Jump to MPEP SourceDuty of Disclosure FundamentalsInequitable Conduct and FraudDuty of Disclosure
MPEP GuidanceRecommendedAlways
[mpep-1448-b36876bd42e571a4f3612d30]
Rejection Withdrawn on Reasonable Interpretation of Admission
Note:
If a rejection is based on an admission of fraud, inequitable conduct, or duty of disclosure and the applicant provides a reasonable interpretation that avoids these conclusions, the rejection should be withdrawn.

Any admission of fraud, inequitable conduct or violation of the duty of disclosure must be explicit, unequivocal, and not subject to other interpretation. Where a rejection is made based upon such an admission (see form paragraph 14.22.fti below) and applicant responds with any reasonable interpretation of the facts that would not lead to a conclusion of fraud, inequitable conduct or violation of the duty of disclosure, the rejection should be withdrawn. Alternatively, if applicant argues that the admission noted by the examiner was not in fact an admission, the rejection should also be withdrawn.

Jump to MPEP SourceDuty of Disclosure FundamentalsInequitable Conduct and FraudDuty of Disclosure
MPEP GuidanceRecommendedAlways
[mpep-1448-adf4a3a7d4a03bcd5ec44a78]
Rejection Withdrawn If Admission Not Confirmed
Note:
If applicant argues the examiner's admission was not an admission, the rejection should be withdrawn.

Any admission of fraud, inequitable conduct or violation of the duty of disclosure must be explicit, unequivocal, and not subject to other interpretation. Where a rejection is made based upon such an admission (see form paragraph 14.22.fti below) and applicant responds with any reasonable interpretation of the facts that would not lead to a conclusion of fraud, inequitable conduct or violation of the duty of disclosure, the rejection should be withdrawn. Alternatively, if applicant argues that the admission noted by the examiner was not in fact an admission, the rejection should also be withdrawn.

Jump to MPEP SourceDuty of Disclosure FundamentalsInequitable Conduct and FraudDuty of Disclosure
Topic

AIA Effective Dates

4 rules
StatutoryInformativeAlways
[mpep-1448-df4c6bc3112cc37316654814]
Deceptive Intent Not Investigated for Pre-2012 Reissues
Note:
The Office will examine lack of deceptive intent in reissue applications filed before September 16, 2012, without investigating fraud, inequitable conduct, or duty of disclosure issues.

The Office does not investigate or reject reissue applications under 37 CFR 1.56. The Office will not comment upon duty of disclosure issues which are brought to the attention of the Office in reissue applications except to note in the application, in appropriate circumstances, that such issues are no longer considered by the Office during its examination of patent applications. Examination as to the lack of deceptive intent requirement in reissue applications filed before September 16, 2012 will continue but without any investigation of fraud, inequitable conduct, or duty of disclosure issues. Applicant’s statement in the reissue oath or declaration of lack of deceptive intent will be accepted as dispositive except in special circumstances such as an admission or judicial determination of fraud, inequitable conduct, or violation of the duty of disclosure.

Jump to MPEP Source · 37 CFR 1.56AIA Effective DatesElements of Inequitable ConductDuty of Disclosure in Reissue
StatutoryRecommendedAlways
[mpep-1448-c4aba29aaef8eaf935a0d174]
Rejection for Fraud or Inequitable Conduct in Pre-2012 Reissue
Note:
For reissue applications filed before September 16, 2012, consult TQAS or SPRS and use form paragraphs 14.21.09.fti or 14.22.fti to reject based on fraud or inequitable conduct.

An admission or judicial determination of fraud, inequitable conduct, or violation of the duty of disclosure is a special circumstance, because no investigation need be made. Accordingly, for a reissue application filed before September 16, 2012, after consulting with the Technology Center (TC) Training Quality Assurance Specialist (TQAS) or Supervisory Patent Reexamination Specialist (SPRS), a rejection should be made using the appropriate one of form paragraphs 14.21.09.fti or 14.22.fti as reproduced below.

Jump to MPEP SourceAIA Effective DatesReissue and ReexaminationAIA Overview and Effective Dates
MPEP GuidanceRecommendedAlways
[mpep-1448-e1ddfce5f999db8d0ec366fb]
Form Paragraph 14.21.09.fti for Pre-2012 Applications with External Fraud Determination
Note:
This rule requires the use of form paragraph 14.21.09.fti for applications filed before September 16, 2012, where an examiner learns of a judicial determination of fraud independently of the case record.

Form paragraph 14.21.09.fti should be used for applications filed before September 16, 2012, where the examiner becomes aware of a judicial determination of fraud, inequitable conduct or violation of the duty of disclosure on the part of the applicant independently of the record of the case, i.e. the examiner has external knowledge of the judicial determination.

Jump to MPEP SourceAIA Effective DatesScope of DutyAssignee as Applicant Signature
MPEP GuidanceRecommendedAlways
[mpep-1448-57def75949c743e26accaeb5]
Requirement for Form Paragraph 14.22.fti Before September 16, 2012
Note:
This rule requires the use of form paragraph 14.22.fti in applications filed before September 16, 2012, where there is an explicit admission or judicial determination of fraud, inequitable conduct, or duty of disclosure.

Form paragraph 14.22.fti should be used for applications filed before September 16, 2012, where, in the application record, there is (a) an explicit, unequivocal admission by applicant of fraud, inequitable conduct or violation of the duty of disclosure which is not subject to other interpretation, or (b) information as to a judicial determination of fraud, inequitable conduct or violation of the duty of disclosure on the part of the applicant. External information which the examiner believes to be an admission by applicant should never be used by the examiner, and such external information should never be made of record in the reissue application.

Jump to MPEP SourceAIA Effective DatesDuty of Disclosure in ReissueAssignee as Applicant Signature
Topic

Duty of Disclosure in Reissue

3 rules
StatutoryInformativeAlways
[mpep-1448-00c3acfda6712f1ba5f269f3]
Duty of Disclosure Not Investigated in Reissues
Note:
The Office does not investigate or comment on duty of disclosure issues in reissue applications, except to note that such issues are no longer considered during examination.

The Office does not investigate or reject reissue applications under 37 CFR 1.56. The Office will not comment upon duty of disclosure issues which are brought to the attention of the Office in reissue applications except to note in the application, in appropriate circumstances, that such issues are no longer considered by the Office during its examination of patent applications. Examination as to the lack of deceptive intent requirement in reissue applications filed before September 16, 2012 will continue but without any investigation of fraud, inequitable conduct, or duty of disclosure issues. Applicant’s statement in the reissue oath or declaration of lack of deceptive intent will be accepted as dispositive except in special circumstances such as an admission or judicial determination of fraud, inequitable conduct, or violation of the duty of disclosure.

Jump to MPEP Source · 37 CFR 1.56Duty of Disclosure in ReissueRejections Specific to ReissueStatutory Authority for Examination
StatutoryInformativeAlways
[mpep-1448-085a69b07f188c15a4e93eaa]
Admission of Fraud Requires No Further Investigation
Note:
If fraud, inequitable conduct, or violation of the duty of disclosure is admitted or judicially determined, no further investigation is required for a reissue application filed before September 16, 2012.

An admission or judicial determination of fraud, inequitable conduct, or violation of the duty of disclosure is a special circumstance, because no investigation need be made. Accordingly, for a reissue application filed before September 16, 2012, after consulting with the Technology Center (TC) Training Quality Assurance Specialist (TQAS) or Supervisory Patent Reexamination Specialist (SPRS), a rejection should be made using the appropriate one of form paragraphs 14.21.09.fti or 14.22.fti as reproduced below.

Jump to MPEP SourceDuty of Disclosure in ReissueReissue ExaminationAIA Effective Dates
StatutoryInformativeAlways
[mpep-1448-61736a56a55db7f5ef62edfc]
Duty of Disclosure in Reissue Examination
Note:
The rule requires applicants to disclose all material information during reissue examination, prohibiting fraud and inequitable conduct.

See MPEP § 2012 for additional discussion as to fraud, inequitable conduct or violation of duty of disclosure in a reissue application.

Jump to MPEP SourceDuty of Disclosure in ReissueReissue ExaminationReissue Patent Practice
Topic

Elements of Inequitable Conduct

2 rules
StatutoryInformativeAlways
[mpep-1448-945c53c46203bd07d4adeb95]
Oath/Declaration of Lack of Deceptive Intent Is Dispositive in Reissues
Note:
Applicant's statement in the reissue oath or declaration regarding lack of deceptive intent is accepted as conclusive unless there is an admission or judicial determination of fraud, inequitable conduct, or violation of the duty of disclosure.

The Office does not investigate or reject reissue applications under 37 CFR 1.56. The Office will not comment upon duty of disclosure issues which are brought to the attention of the Office in reissue applications except to note in the application, in appropriate circumstances, that such issues are no longer considered by the Office during its examination of patent applications. Examination as to the lack of deceptive intent requirement in reissue applications filed before September 16, 2012 will continue but without any investigation of fraud, inequitable conduct, or duty of disclosure issues. Applicant’s statement in the reissue oath or declaration of lack of deceptive intent will be accepted as dispositive except in special circumstances such as an admission or judicial determination of fraud, inequitable conduct, or violation of the duty of disclosure.

Jump to MPEP Source · 37 CFR 1.56Elements of Inequitable ConductDuty of Disclosure in ReissueRejections Specific to Reissue
StatutoryRecommendedAlways
[mpep-1448-95dc0ff5fd121aa3afad8b3f]
Admission of Fraud Must Be Explicit
Note:
An admission of fraud must be explicit and unequivocal to override an applicant's statement in the oath or declaration of lack of deceptive intent.

3. In bracket 3, insert a statement that there has been an admission or a judicial determination of fraud, inequitable conduct or violation of duty of disclosure which provide circumstances why applicant’s statement in the oath or declaration of lack of deceptive intent should not be taken as dispositive. Any admission of fraud, inequitable conduct or violation of duty of disclosure must be explicit, unequivocal, and not subject to other interpretation.

35 U.S.C.Elements of Inequitable ConductInequitable Conduct and FraudDuty of Disclosure
Topic

Inequitable Conduct and Fraud

1 rules
StatutoryRequiredAlways
[mpep-1448-c60854ce3c4f1286bfd39f26]
Admission of Fraud Must Be Explicit
Note:
Any admission of fraud, inequitable conduct, or violation of duty of disclosure must be clearly stated and not open to other interpretations.

3. In bracket 3, insert a statement that there has been an admission or a judicial determination of fraud, inequitable conduct or violation of duty of disclosure which provide circumstances why applicant’s statement in the oath or declaration of lack of deceptive intent should not be taken as dispositive. Any admission of fraud, inequitable conduct or violation of duty of disclosure must be explicit, unequivocal, and not subject to other interpretation.

35 U.S.C.Inequitable Conduct and FraudDuty of DisclosureElements of Inequitable Conduct

Citations

Primary topicCitation
AIA Effective Dates
Duty of Disclosure in Reissue
Elements of Inequitable Conduct
37 CFR § 1.56
Duty of Disclosure in ReissueMPEP § 2012
AIA Effective DatesForm Paragraph § 14.21.09
AIA Effective Dates
Duty of Disclosure Fundamentals
Form Paragraph § 14.22

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: 2025-12-31