MPEP § 1868 — Correction of Defects in the Demand (Annotated Rules)

§1868 Correction of Defects in the Demand

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

This page consolidates and annotates all enforceable requirements under MPEP § 1868, 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.

Correction of Defects in the Demand

This section addresses Correction of Defects in the Demand. Contains: 5 requirements, 1 prohibition, 2 permissions, and 2 other statements.

Key Rules

Topic

Period for Reply (37 CFR 1.134)

4 rules
StatutoryRequiredAlways
[mpep-1868-0980392e5c72c7c9f840982e]
Invitation to Submit Amendments When Not Submitted
Note:
The International Preliminary Examining Authority must invite the applicant to submit amendments under Article 34 if no such amendments are actually submitted with the demand.

(g) Where the statement concerning amendments contains an indication that amendments under Article 34 are submitted with the demand (Rule 53.9(c)) but no such amendments are, in fact, submitted, the International Preliminary Examining Authority shall invite the applicant to submit the amendments within a time limit fixed in the invitation and shall proceed as provided for in Rule 69.1(e).

Jump to MPEP SourcePeriod for Reply (37 CFR 1.134)
MPEP GuidanceRequiredAlways
[mpep-1868-7ef2ab99e8d5b266f66bd9bf]
Time Limit for Correcting Demand Defects
Note:
The International Preliminary Examining Authority must invite the applicant to correct defects in the demand within a reasonable time limit, which is at least one month from the invitation and may be extended.

(a) Subject to paragraphs (a- bis) and (a- ter), if the demand does not comply with the requirements specified in Rules 53.1, 53.2(a)(i) to (iii), 53.2(b), 53.3 to 53.8 and 55.1, the International Preliminary Examining Authority shall invite the applicant to correct the defects within a time limit which shall be reasonable under the circumstances. That time limit shall not be less than one month from the date of the invitation. It may be extended by the International Preliminary Examining Authority at any time before a decision is taken.

Jump to MPEP SourcePeriod for Reply (37 CFR 1.134)
MPEP GuidanceProhibitedAlways
[mpep-1868-1fa457f383eaafcdae320c0f]
Minimum One Month to Correct Defects
Note:
The International Preliminary Examining Authority must provide at least one month to correct defects in the demand, which can be extended before a decision is made.

(a) Subject to paragraphs (a- bis) and (a- ter), if the demand does not comply with the requirements specified in Rules 53.1, 53.2(a)(i) to (iii), 53.2(b), 53.3 to 53.8 and 55.1, the International Preliminary Examining Authority shall invite the applicant to correct the defects within a time limit which shall be reasonable under the circumstances. That time limit shall not be less than one month from the date of the invitation. It may be extended by the International Preliminary Examining Authority at any time before a decision is taken.

Jump to MPEP SourcePeriod for Reply (37 CFR 1.134)
MPEP GuidanceRequiredAlways
[mpep-1868-948cc1e82934b1fe1bee8c59]
Demand Not Submitted If Applicant Does Not Comply Within Time Limit
Note:
If the applicant fails to comply with an invitation within the specified time limit, the demand will be deemed not submitted and the International Preliminary Examining Authority must declare this.

(c) If the applicant does not comply with the invitation within the time limit under paragraph (a), the demand shall be considered as if it had not been submitted and the International Preliminary Examining Authority shall so declare.

Jump to MPEP SourcePeriod for Reply (37 CFR 1.134)
Topic

International Filing Date

3 rules
StatutoryRequiredAlways
[mpep-1868-4e6eb5f38b655677c8d409de]
Type of Correction Determines Filing Date Change
Note:
The filing date of the Demand may change based on the type of correction made to it.

Defects in the Demand may be corrected. The type of correction determines whether the filing date of the Demand must be changed. The most common defects which result in the mailing of an invitation to correct are found in PCT Rules 53 and 55. If the applicant complies with the invitation, the Demand is considered as if it had been received on the actual filing date, i.e., the original date of receipt, provided that the demand as submitted permitted the international application to be identified. See PCT Rule 60.1(b).

Jump to MPEP SourceInternational Filing DateArticle 34 AmendmentsDemand for Preliminary Examination
StatutoryPermittedAlways
[mpep-1868-f4894af7f583e1a48c20ce98]
Demand Considered as Filed Date if Corrected
Note:
If the applicant complies with an invitation to correct defects in the demand, it is considered received on the original filing date.

Defects in the Demand may be corrected. The type of correction determines whether the filing date of the Demand must be changed. The most common defects which result in the mailing of an invitation to correct are found in PCT Rules 53 and 55. If the applicant complies with the invitation, the Demand is considered as if it had been received on the actual filing date, i.e., the original date of receipt, provided that the demand as submitted permitted the international application to be identified. See PCT Rule 60.1(b).

Jump to MPEP SourceInternational Filing DateArticle 34 AmendmentsDemand for Preliminary Examination
MPEP GuidanceRequiredAlways
[mpep-1868-3328734b3b2ca7cdd6de778b]
Demand Considered as Filing Date if Corrected
Note:
If the applicant corrects a defect within the time limit, the demand will be considered as received on the filing date. Otherwise, it is considered when the International Preliminary Examining Authority receives the correction.

(b) If the applicant complies with the invitation within the time limit under paragraph (a), the demand shall be considered as if it had been received on the actual filing date, provided that the demand as submitted permitted the international application to be identified; otherwise, the demand shall be considered as if it had been received on the date on which the International Preliminary Examining Authority receives the correction.

Jump to MPEP SourceInternational Filing DateArticle 34 AmendmentsDemand for Preliminary Examination
Topic

Patent Cooperation Treaty

2 rules
StatutoryInformativeAlways
[mpep-1868-26121375ffe9992c57a8159e]
Common Defects Triggering Invitation to Correct in PCT Rules 53 and 55
Note:
This rule identifies the most frequent errors leading to an invitation to correct in the context of Patent Cooperation Treaty (PCT) Rules 53 and 55.

Defects in the Demand may be corrected. The type of correction determines whether the filing date of the Demand must be changed. The most common defects which result in the mailing of an invitation to correct are found in PCT Rules 53 and 55. If the applicant complies with the invitation, the Demand is considered as if it had been received on the actual filing date, i.e., the original date of receipt, provided that the demand as submitted permitted the international application to be identified. See PCT Rule 60.1(b).

Jump to MPEP SourcePatent Cooperation TreatyInternational Filing DateArticle 34 Amendments
StatutoryInformativeAlways
[mpep-1868-56cff6f839e1e26df48de532]
Invitation to Correct Demand Defects
Note:
If a demand for international filing has defects, the applicant can correct them and the original filing date will be maintained if the corrected demand identifies the international application properly.

Defects in the Demand may be corrected. The type of correction determines whether the filing date of the Demand must be changed. The most common defects which result in the mailing of an invitation to correct are found in PCT Rules 53 and 55. If the applicant complies with the invitation, the Demand is considered as if it had been received on the actual filing date, i.e., the original date of receipt, provided that the demand as submitted permitted the international application to be identified. See PCT Rule 60.1(b).

Jump to MPEP SourcePatent Cooperation TreatyInternational Filing DateArticle 34 Amendments
Topic

Article 34 Amendments

1 rules
StatutoryPermittedAlways
[mpep-1868-79c5761c6ce61b60d4d0dd26]
Defects in Demand Can Be Fixed
Note:
The filing date of a demand can remain unchanged if the applicant corrects any defects as invited by the PCT rules.

Defects in the Demand may be corrected. The type of correction determines whether the filing date of the Demand must be changed. The most common defects which result in the mailing of an invitation to correct are found in PCT Rules 53 and 55. If the applicant complies with the invitation, the Demand is considered as if it had been received on the actual filing date, i.e., the original date of receipt, provided that the demand as submitted permitted the international application to be identified. See PCT Rule 60.1(b).

Jump to MPEP SourceArticle 34 AmendmentsDemand for Preliminary ExaminationInternational Preliminary Examination (Chapter II)
Topic

Signature Requirements

1 rules
MPEP GuidanceRequiredAlways
[mpep-1868-ca179d2637dd3be2bdd8e633]
Single Signature Sufficient for Multiple Applicants
Note:
For multiple applicants, a demand can be signed by any one of them.

(a-ter) For the purposes of Rule 53.8, if there are two or more applicants, it shall be sufficient that the demand be signed by one of them.

Jump to MPEP SourceSignature Requirements

Citations

Primary topicCitation
Article 34 Amendments
International Filing Date
Patent Cooperation Treaty
PCT Rules 53
Article 34 Amendments
International Filing Date
Patent Cooperation Treaty
PCT Rule 60.1(b)

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