MPEP § 1843.03 — No Search Required if Claims Are Unclear (Annotated Rules)

§1843.03 No Search Required if Claims Are Unclear

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

This page consolidates and annotates all enforceable requirements under MPEP § 1843.03, 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.

No Search Required if Claims Are Unclear

This section addresses No Search Required if Claims Are Unclear. Contains: 3 prohibitions, 1 permission, and 1 other statement.

Key Rules

Topic

Article 19 Amendment Scope

4 rules
StatutoryPermittedAlways
[mpep-1843-03-9aea6651dd20cc4417bd8680]
Description, Claims, Drawings Must Comply for Search Report
Note:
If the International Searching Authority finds that the description, claims, or drawings do not meet requirements, they may decline to establish a search report.

If the International Searching Authority considers that the description, the claims, or the drawings fail to comply with the prescribed requirements to such an extent that a meaningful search could not be carried out, it may declare that it will not establish a search report (PCT Article 17(2)(a)(ii)). Further, for applications having an international filing date on or after January 1, 2004, if the International Searching Authority considers that the description, claims, or drawings are so unclear, or the claims are so inadequately supported by the description that no meaningful opinion can be formed on the novelty, inventive step (non-obviousness), or industrial applicability of the claimed invention, the Authority shall not go into these issues in its written opinion with regard to the claims so affected (PCT Rules 43bis.1(b) and 66.1(e)). For example, the examiner may determine that a meaningful search cannot be carried out or that no meaningful opinion can be formed in certain cases where a nucleotide and/or amino acid sequence listing is not furnished in the required form, language and manner. See Administrative Instructions Section 513(c) and MPEP § 1848. Further, the examiner may determine that a meaningful search cannot be carried out or that no meaningful opinion can be formed for improper multiple dependent claims (see PCT Rule 6.4(a)).

Jump to MPEP SourceArticle 19 Amendment ScopeArticle 19 Amendment TimingPCT Description Requirements
StatutoryProhibitedAlways
[mpep-1843-03-379accadcd34ca86714ab542]
Claims Must Be Clearly Supported by Description
Note:
For applications filed on or after January 1, 2004, if the claims are not adequately supported by the description, the International Searching Authority will not address issues of novelty, inventive step, or industrial applicability in its written opinion.

If the International Searching Authority considers that the description, the claims, or the drawings fail to comply with the prescribed requirements to such an extent that a meaningful search could not be carried out, it may declare that it will not establish a search report (PCT Article 17(2)(a)(ii)). Further, for applications having an international filing date on or after January 1, 2004, if the International Searching Authority considers that the description, claims, or drawings are so unclear, or the claims are so inadequately supported by the description that no meaningful opinion can be formed on the novelty, inventive step (non-obviousness), or industrial applicability of the claimed invention, the Authority shall not go into these issues in its written opinion with regard to the claims so affected (PCT Rules 43bis.1(b) and 66.1(e)). For example, the examiner may determine that a meaningful search cannot be carried out or that no meaningful opinion can be formed in certain cases where a nucleotide and/or amino acid sequence listing is not furnished in the required form, language and manner. See Administrative Instructions Section 513(c) and MPEP § 1848. Further, the examiner may determine that a meaningful search cannot be carried out or that no meaningful opinion can be formed for improper multiple dependent claims (see PCT Rule 6.4(a)).

Jump to MPEP SourceArticle 19 Amendment ScopePCT Description RequirementsInternational Filing Date
StatutoryInformativeAlways
[mpep-1843-03-26de77a6f85a8a6c0cfb2a7d]
No Search if Claims Unclear
Note:
If claims are unclear, a meaningful search cannot be conducted and no search report will be established.

If the International Searching Authority considers that the description, the claims, or the drawings fail to comply with the prescribed requirements to such an extent that a meaningful search could not be carried out, it may declare that it will not establish a search report (PCT Article 17(2)(a)(ii)). Further, for applications having an international filing date on or after January 1, 2004, if the International Searching Authority considers that the description, claims, or drawings are so unclear, or the claims are so inadequately supported by the description that no meaningful opinion can be formed on the novelty, inventive step (non-obviousness), or industrial applicability of the claimed invention, the Authority shall not go into these issues in its written opinion with regard to the claims so affected (PCT Rules 43bis.1(b) and 66.1(e)). For example, the examiner may determine that a meaningful search cannot be carried out or that no meaningful opinion can be formed in certain cases where a nucleotide and/or amino acid sequence listing is not furnished in the required form, language and manner. See Administrative Instructions Section 513(c) and MPEP § 1848. Further, the examiner may determine that a meaningful search cannot be carried out or that no meaningful opinion can be formed for improper multiple dependent claims (see PCT Rule 6.4(a)).

Jump to MPEP SourceArticle 19 Amendment ScopeArticle 19 Amendment TimingPCT Claims Format
StatutoryProhibitedAlways
[mpep-1843-03-036501d1db518b6c5ee57c3a]
Requirement for Proper Claim Dependencies
Note:
The examiner must determine if multiple dependent claims are improper and cannot form a meaningful opinion on their validity.

If the International Searching Authority considers that the description, the claims, or the drawings fail to comply with the prescribed requirements to such an extent that a meaningful search could not be carried out, it may declare that it will not establish a search report (PCT Article 17(2)(a)(ii)). Further, for applications having an international filing date on or after January 1, 2004, if the International Searching Authority considers that the description, claims, or drawings are so unclear, or the claims are so inadequately supported by the description that no meaningful opinion can be formed on the novelty, inventive step (non-obviousness), or industrial applicability of the claimed invention, the Authority shall not go into these issues in its written opinion with regard to the claims so affected (PCT Rules 43bis.1(b) and 66.1(e)). For example, the examiner may determine that a meaningful search cannot be carried out or that no meaningful opinion can be formed in certain cases where a nucleotide and/or amino acid sequence listing is not furnished in the required form, language and manner. See Administrative Instructions Section 513(c) and MPEP § 1848. Further, the examiner may determine that a meaningful search cannot be carried out or that no meaningful opinion can be formed for improper multiple dependent claims (see PCT Rule 6.4(a)).

Jump to MPEP SourceArticle 19 Amendment ScopePCT Claims FormatInternational Searching Authority (ISA)
Topic

PCT Description Requirements

1 rules
StatutoryProhibitedAlways
[mpep-1843-03-9c4807f7009ad5ff078237bf]
Nucleotide and Amino Acid Sequence Listing Required for Search
Note:
A meaningful search cannot be conducted if a nucleotide or amino acid sequence listing is not provided in the required form, language, and manner.

If the International Searching Authority considers that the description, the claims, or the drawings fail to comply with the prescribed requirements to such an extent that a meaningful search could not be carried out, it may declare that it will not establish a search report (PCT Article 17(2)(a)(ii)). Further, for applications having an international filing date on or after January 1, 2004, if the International Searching Authority considers that the description, claims, or drawings are so unclear, or the claims are so inadequately supported by the description that no meaningful opinion can be formed on the novelty, inventive step (non-obviousness), or industrial applicability of the claimed invention, the Authority shall not go into these issues in its written opinion with regard to the claims so affected (PCT Rules 43bis.1(b) and 66.1(e)). For example, the examiner may determine that a meaningful search cannot be carried out or that no meaningful opinion can be formed in certain cases where a nucleotide and/or amino acid sequence listing is not furnished in the required form, language and manner. See Administrative Instructions Section 513(c) and MPEP § 1848. Further, the examiner may determine that a meaningful search cannot be carried out or that no meaningful opinion can be formed for improper multiple dependent claims (see PCT Rule 6.4(a)).

Jump to MPEP SourcePCT Description RequirementsInternational Searching Authority (ISA)Sequence Listing in PCT

Citations

Primary topicCitation
Article 19 Amendment Scope
PCT Description Requirements
MPEP § 1848
Article 19 Amendment Scope
PCT Description Requirements
PCT Article 17(2)(a)(ii)
Article 19 Amendment Scope
PCT Description Requirements
PCT Rules 43bis.1(b)
Article 19 Amendment Scope
PCT Description Requirements
PCT Rule 6.4(a)

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