MPEP § 1803 — Reservations Under the PCT Taken by, and Notifications of Incompatibility Made by, the United States of America (Annotated Rules)

§1803 Reservations Under the PCT Taken by, and Notifications of Incompatibility Made by, the United States of America

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

This page consolidates and annotates all enforceable requirements under MPEP § 1803, 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.

Reservations Under the PCT Taken by, and Notifications of Incompatibility Made by, the United States of America

This section addresses Reservations Under the PCT Taken by, and Notifications of Incompatibility Made by, the United States of America. Primary authority: 35 U.S.C. 122(b), 35 U.S.C. 122(b)(2), and 35 U.S.C. 361(c). Contains: 1 requirement, 1 prohibition, and 3 other statements.

Key Rules

Topic

Receiving Office (RO/US)

2 rules
StatutoryInformativeAlways
[mpep-1803-306ac58e6863e4a40e989c19]
U.S. Receiving Office Requires English Filings
Note:
The U.S. Patent and Trademark Office requires all patent applications to be submitted in English, as per 35 U.S.C. 361(c).

The U.S. Receiving Office continues to accept applications only in English. See 35 U.S.C. 361(c). PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) permit an international filing date to be accorded even though portions of an international application are in a language not acceptable to the Receiving Office. PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) are not compatible with the national law applied by the United States Patent and Trademark Office (USPTO) as receiving Office. Thus, the USPTO has made a notification of incompatibility with respect to these rules pursuant to PCT Rules 20.1(d), 26.3ter(b) and 26.3ter(d). As a result, PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) shall not apply to the USPTO as receiving Office for as long as the aforementioned incompatibility exists.

Jump to MPEP SourceReceiving Office (RO/US)PCT International Application FilingInternational Filing Date
StatutoryProhibitedAlways
[mpep-1803-d1323bbf49fe8e3d3a207bc2]
PCT Rules Not Applicable to USPTO Due to Incompatibility
Note:
The PCT rules that permit international filings in languages other than English are not applicable to the USPTO as long as there is an incompatibility with U.S. law.

The U.S. Receiving Office continues to accept applications only in English. See 35 U.S.C. 361(c). PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) permit an international filing date to be accorded even though portions of an international application are in a language not acceptable to the Receiving Office. PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) are not compatible with the national law applied by the United States Patent and Trademark Office (USPTO) as receiving Office. Thus, the USPTO has made a notification of incompatibility with respect to these rules pursuant to PCT Rules 20.1(d), 26.3ter(b) and 26.3ter(d). As a result, PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) shall not apply to the USPTO as receiving Office for as long as the aforementioned incompatibility exists.

Jump to MPEP SourceReceiving Office (RO/US)PCT International Application FilingPatent Cooperation Treaty
Topic

Demand for Preliminary Examination

1 rules
StatutoryInformativeAlways
[mpep-1803-cdf2049fb339830d66c7d4dc]
U.S. Withdraws Reservation on PCT Chapter II
Note:
The United States of America withdrew its original declaration that it was not bound by Chapter II (PCT Article 64(1)) on July 1, 1987.

The United States of America had originally declared that it was not bound by Chapter II (PCT Article 64(1)), but withdrew that reservation on July 1, 1987.

Jump to MPEP SourceDemand for Preliminary ExaminationInternational Preliminary Examination (Chapter II)Patent Cooperation Treaty
Topic

Access to Published PCT Applications

1 rules
StatutoryRequiredAlways
[mpep-1803-32e9ba5b4fc0e2016b697012]
No International Publication Required for US Designated PCT Applications
Note:
The United States does not require international publication of PCT applications where the U.S. is the only designated state, unless the application enters national stage or is allowed as a U.S. patent.

It has also declared that, as far as the United States of America is concerned, international publication is not required (PCT Article 64 (3)). Accordingly, under PCT Article 64(3)(b), if the United States is the only PCT Contracting State designated in an international application, the international application will not be published by the International Bureau (IB) at 18 months. Even though the United States Patent and Trademark Office has pre-grant publication under 35 U.S.C. 122(b), the United States has not removed its reservation under PCT Article 64(3) because not all United States patent applications are published. See 35 U.S.C. 122(b)(2). The application will, however, be published under 35 U.S.C. 122(b) if it enters the national stage in the United States. It will be published again if it is allowed to issue as a United States patent. This reservation is still in effect.

Jump to MPEP SourceAccess to Published PCT ApplicationsNationals and ResidentsPublication Language
Topic

Article 19 Amendment Scope

1 rules
StatutoryInformativeAlways
[mpep-1803-d49db2a40f93f1c918e3944f]
Publication Not Required If U.S. is Only Designated State
Note:
If the United States is the only PCT contracting state designated in an international application, it will not be published by the International Bureau at 18 months.

It has also declared that, as far as the United States of America is concerned, international publication is not required (PCT Article 64 (3)). Accordingly, under PCT Article 64(3)(b), if the United States is the only PCT Contracting State designated in an international application, the international application will not be published by the International Bureau (IB) at 18 months. Even though the United States Patent and Trademark Office has pre-grant publication under 35 U.S.C. 122(b), the United States has not removed its reservation under PCT Article 64(3) because not all United States patent applications are published. See 35 U.S.C. 122(b)(2). The application will, however, be published under 35 U.S.C. 122(b) if it enters the national stage in the United States. It will be published again if it is allowed to issue as a United States patent. This reservation is still in effect.

Jump to MPEP SourceArticle 19 Amendment ScopeNationals and ResidentsPublication Timing (18 Months)
Topic

Access to Published Application File

1 rules
StatutoryInformativeAlways
[mpep-1803-3cf4ac126e1aabcb906e3428]
United States Reserves PCT Article 64(3) Not All Applications Published
Note:
The United States has not removed its reservation under PCT Article 64(3) because not all U.S. patent applications are published, even though pre-grant publication exists for some.

It has also declared that, as far as the United States of America is concerned, international publication is not required (PCT Article 64 (3)). Accordingly, under PCT Article 64(3)(b), if the United States is the only PCT Contracting State designated in an international application, the international application will not be published by the International Bureau (IB) at 18 months. Even though the United States Patent and Trademark Office has pre-grant publication under 35 U.S.C. 122(b), the United States has not removed its reservation under PCT Article 64(3) because not all United States patent applications are published. See 35 U.S.C. 122(b)(2). The application will, however, be published under 35 U.S.C. 122(b) if it enters the national stage in the United States. It will be published again if it is allowed to issue as a United States patent. This reservation is still in effect.

Jump to MPEP SourceAccess to Published Application FileNationals and ResidentsPublication Language
Topic

Access to National Stage Applications

1 rules
StatutoryInformativeAlways
[mpep-1803-d1f7205786b62466185f81f5]
Publication Required for National Stage Applications
Note:
The application must be published under 35 U.S.C. 122(b) if it enters the national stage in the United States and again if it issues as a United States patent.

It has also declared that, as far as the United States of America is concerned, international publication is not required (PCT Article 64 (3)). Accordingly, under PCT Article 64(3)(b), if the United States is the only PCT Contracting State designated in an international application, the international application will not be published by the International Bureau (IB) at 18 months. Even though the United States Patent and Trademark Office has pre-grant publication under 35 U.S.C. 122(b), the United States has not removed its reservation under PCT Article 64(3) because not all United States patent applications are published. See 35 U.S.C. 122(b)(2). The application will, however, be published under 35 U.S.C. 122(b) if it enters the national stage in the United States. It will be published again if it is allowed to issue as a United States patent. This reservation is still in effect.

Jump to MPEP SourceAccess to National Stage ApplicationsNationals and ResidentsReceiving Office (RO/US)
Topic

Effect of International Filing

1 rules
StatutoryInformativeAlways
[mpep-1803-df3a1a8064c36858d373a978]
Reservation Still In Force
Note:
The United States has not removed its reservation under PCT Article 64(3), meaning international applications will not be published at 18 months if the U.S. is the only designated state, unless they enter national stage or are allowed as a patent.

It has also declared that, as far as the United States of America is concerned, international publication is not required (PCT Article 64 (3)). Accordingly, under PCT Article 64(3)(b), if the United States is the only PCT Contracting State designated in an international application, the international application will not be published by the International Bureau (IB) at 18 months. Even though the United States Patent and Trademark Office has pre-grant publication under 35 U.S.C. 122(b), the United States has not removed its reservation under PCT Article 64(3) because not all United States patent applications are published. See 35 U.S.C. 122(b)(2). The application will, however, be published under 35 U.S.C. 122(b) if it enters the national stage in the United States. It will be published again if it is allowed to issue as a United States patent. This reservation is still in effect.

Jump to MPEP SourceEffect of International FilingEffect of International PublicationAccess to National Stage Applications
Topic

International Filing Date

1 rules
StatutoryInformativeAlways
[mpep-1803-a36fe123cad4fb800aaa6822]
International Filing Date Despite Language Incompatibility
Note:
Allows an international filing date even if some parts of the application are in a language not accepted by the U.S. Receiving Office.

The U.S. Receiving Office continues to accept applications only in English. See 35 U.S.C. 361(c). PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) permit an international filing date to be accorded even though portions of an international application are in a language not acceptable to the Receiving Office. PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) are not compatible with the national law applied by the United States Patent and Trademark Office (USPTO) as receiving Office. Thus, the USPTO has made a notification of incompatibility with respect to these rules pursuant to PCT Rules 20.1(d), 26.3ter(b) and 26.3ter(d). As a result, PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) shall not apply to the USPTO as receiving Office for as long as the aforementioned incompatibility exists.

Jump to MPEP SourceInternational Filing DateReceiving Office (RO/US)PCT International Application Filing
Topic

Nationals and Residents

1 rules
StatutoryInformativeAlways
[mpep-1803-c55590706c7afa0c4732014c]
USPTO Not Accepting PCT Rules 20.1(c), 26.3ter(a), and 26.3ter(c)
Note:
The USPTO has notified that it does not accept PCT Rules 20.1(c), 26.3ter(a), and 26.3ter(c) due to incompatibility with U.S. national law.

The U.S. Receiving Office continues to accept applications only in English. See 35 U.S.C. 361(c). PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) permit an international filing date to be accorded even though portions of an international application are in a language not acceptable to the Receiving Office. PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) are not compatible with the national law applied by the United States Patent and Trademark Office (USPTO) as receiving Office. Thus, the USPTO has made a notification of incompatibility with respect to these rules pursuant to PCT Rules 20.1(d), 26.3ter(b) and 26.3ter(d). As a result, PCT Rules 20.1(c), 26.3ter(a) and 26.3ter(c) shall not apply to the USPTO as receiving Office for as long as the aforementioned incompatibility exists.

Jump to MPEP SourceNationals and ResidentsReceiving Office (RO/US)PCT International Application Filing
Topic

National Stage Entry

1 rules
StatutoryInformativeAlways
[mpep-1803-6787e54edc3872175f031631]
PCT Rules Not Compatible with USPTO National Stage Entry
Note:
The PCT rules 49.5(c-bis) and 49.5(k) are not compatible with the national law applied by the USPTO for the national stage entry, hence they do not apply.

PCT Rules 49.5(c-bis) and 49.5(k) continue not to be compatible with the national law applied by the USPTO as a designated Office. See 35 U.S.C. 371(c)(2). As a result, PCT Rules 49.5(c-bis) and 49.5(k) shall not apply to the USPTO as designated Office for as long as the aforementioned incompatibility exists.

Jump to MPEP SourceNational Stage EntryPatent Cooperation Treaty
Topic

Patent Cooperation Treaty

1 rules
StatutoryProhibitedAlways
[mpep-1803-087d8867a431da997289fb59]
PCT Rules Not Applicable to USPTO Due to Incompatibility
Note:
The PCT rules 49.5(c-bis) and 49.5(k) do not apply to the USPTO as long as they are incompatible with U.S. national law.

PCT Rules 49.5(c-bis) and 49.5(k) continue not to be compatible with the national law applied by the USPTO as a designated Office. See 35 U.S.C. 371(c)(2). As a result, PCT Rules 49.5(c-bis) and 49.5(k) shall not apply to the USPTO as designated Office for as long as the aforementioned incompatibility exists.

Jump to MPEP SourcePatent Cooperation TreatyNational Stage Entry

Citations

Primary topicCitation
Access to National Stage Applications
Access to Published Application File
Access to Published PCT Applications
Article 19 Amendment Scope
Effect of International Filing
35 U.S.C. § 122(b)
Access to National Stage Applications
Access to Published Application File
Access to Published PCT Applications
Article 19 Amendment Scope
Effect of International Filing
35 U.S.C. § 122(b)(2)
International Filing Date
Nationals and Residents
Receiving Office (RO/US)
35 U.S.C. § 361(c)
National Stage Entry
Patent Cooperation Treaty
35 U.S.C. § 371(c)(2)
International Filing Date
Nationals and Residents
Receiving Office (RO/US)
PCT Rules 20.1(c)
National Stage Entry
Patent Cooperation Treaty
PCT Rules 49.5
Access to National Stage Applications
Access to Published Application File
Access to Published PCT Applications
Article 19 Amendment Scope
Demand for Preliminary Examination
Effect of International Filing
PCT Article 64(3)

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