MPEP § 1843 — The International Search (Annotated Rules)

§1843 The International Search

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

This page consolidates and annotates all enforceable requirements under MPEP § 1843, 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.

The International Search

This section addresses The International Search. Contains: 3 requirements, 1 guidance statement, and 1 other statement.

Key Rules

Topic

International Searching Authority (ISA)

3 rules
StatutoryRequiredAlways
[mpep-1843-6994927fbafb15fc62a72e7c]
ISA Must Issue Written Opinion on Novelty and Compliance
Note:
The International Searching Authority must issue a written opinion assessing the novelty, inventive step, industrial applicability of the claimed invention, and compliance with treaty requirements.
(a) Subject to Rule 69.1(b-bis), the International Searching Authority shall, at the same time as it establishes the international search report or the declaration referred to in Article 17(2)(a), establish a written opinion as to:
  • (i) whether the claimed invention appears to be novel, to involve an inventive step (to be non-obvious), and to be industrially applicable;
  • (ii) whether the international application complies with the requirements of the Treaty and these Regulations in so far as checked by the International Searching Authority. The written opinion shall also be accompanied by such other observations as these Regulations provide for.
Jump to MPEP SourceInternational Searching Authority (ISA)International Search ReportWritten Opinion of ISA
StatutoryInformativeAlways
[mpep-1843-736f9b918520f44fe6e2a1b7]
Written Opinion by ISA Required
Note:
The International Searching Authority must establish a written opinion on whether the international application complies with Treaty and Regulation requirements.

(a) Subject to Rule 69.1(b-bis), the International Searching Authority shall, at the same time as it establishes the international search report or the declaration referred to in Article 17(2)(a), establish a written opinion as to:

(ii) whether the international application complies with the requirements of the Treaty and these Regulations in so far as checked by the International Searching Authority.

Jump to MPEP SourceInternational Searching Authority (ISA)International SearchPatent Cooperation Treaty
StatutoryRecommendedAlways
[mpep-1843-2f92e72b68b52882077b2b14]
Objective of International Search Is to Identify Relevant Prior Art
Note:
The international search aims to uncover prior art for all U.S. national applications filed after June 1, 1978.

PCT Article 15 describes the objective of the international search, i.e., to uncover relevant prior art, and also describes the international-type search. It should be noted generally that an international-type search is performed on all U.S. national applications filed after June 1, 1978.

Jump to MPEP SourceInternational Searching Authority (ISA)International Search ReportInternational Search
Topic

Written Opinion of ISA

1 rules
StatutoryRequiredAlways
[mpep-1843-1b1e54bdf1dc022ead933766]
Written Opinion Must Include Other Observations
Note:
The written opinion established by the International Searching Authority must include any additional observations required by these Regulations.

(a) Subject to Rule 69.1(b-bis), the International Searching Authority shall, at the same time as it establishes the international search report or the declaration referred to in Article 17(2)(a), establish a written opinion as to:

The written opinion shall also be accompanied by such other observations as these Regulations provide for.

Jump to MPEP SourceWritten Opinion of ISAInternational Searching Authority (ISA)International Search Report
Topic

Patent Term Expiration

1 rules
StatutoryRequiredAlways
[mpep-1843-4056522d9b521a793ab6e2b2]
Notification of Written Opinion as International Preliminary Exam Opinion
Note:
The written opinion will notify the applicant that if an international preliminary examination is requested, it will be considered the International Preliminary Examining Authority's opinion and require a reply with amendments before the deadline.

(c) The written opinion shall contain a notification informing the applicant that, if a demand for international preliminary examination is made, the written opinion shall, under Rule 66.1bis(a) but subject to Rule 66.1bis(b), be considered to be a written opinion of the International Preliminary Examining Authority for the purposes of Rule 66.2(a), in which case the applicant is invited to submit to that Authority, before the expiration of the time limit under Rule 54 bis.1(a), a written reply together, where appropriate, with amendments.

Jump to MPEP SourcePatent Term ExpirationPatent TermPeriod for Reply (37 CFR 1.134)

Citations

Primary topicCitation
International Searching Authority (ISA)PCT Article 15

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