MPEP § 1851 — Identification of Patent Documents (Annotated Rules)

§1851 Identification of Patent Documents

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

This page consolidates and annotates all enforceable requirements under MPEP § 1851, 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.

Identification of Patent Documents

This section addresses Identification of Patent Documents. Contains: 3 requirements, 1 guidance statement, and 3 other statements.

Key Rules

Topic

Sequence Listing Requirements

3 rules
MPEP GuidanceInformativeAlways
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Requirement for Identifying Patent Documents and Country Codes
Note:
The rule requires the identification of patent documents and listing of two-letter country codes for countries issuing industrial property information.

The examiner, in completing the international search report as well as the written opinion and international preliminary examination report, is required to cite the references in accordance with the provisions of Administrative Instructions Sections 503 and 611 and WIPO Standard ST.14. These sections of the Administrative Instructions require reference citations to include, in addition to other information which is apparent from the forms which the examiner fills out, an indication of the two-letter country code of the country or entity issuing or publishing the document and the standard code for identifying the kind of patent document. The discussion which follows is limited to the identification of patent documents (and nonpatent publications) and a listing of the two-letter country codes for countries or other entities which issue or publish industrial property information.

Jump to MPEP SourceSequence Listing RequirementsSequence Listing Format
MPEP GuidanceInformativeAlways
[mpep-1851-935fb4dad57f1ae05be1a863]
Guideline for Citing Patents and Published Applications
Note:
Provides the order and format for citing commonly referenced patents and published patent applications.

The most commonly cited documents are patents and published patent applications. A guideline for the citation of such documents is listed below. The listing is indicated in the order in which the elements should be listed.

Jump to MPEP SourceSequence Listing Requirements
MPEP GuidanceRecommendedAlways
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Order of Listing Patent Documents
Note:
The listing must follow the order specified for patent documents as per the guidelines.

The most commonly cited documents are patents and published patent applications. A guideline for the citation of such documents is listed below. The listing is indicated in the order in which the elements should be listed.

Jump to MPEP SourceSequence Listing Requirements
Topic

Sequence Listing Format

2 rules
MPEP GuidanceRequiredAlways
[mpep-1851-ce86f7f0058f43fbd3593439]
References Must Be Cited According to Administrative Instructions
Note:
Examiners must cite references in international search reports, written opinions, and international preliminary examination reports according to sections 503 and 611 of the Administrative Instructions and WIPO Standard ST.14.

The examiner, in completing the international search report as well as the written opinion and international preliminary examination report, is required to cite the references in accordance with the provisions of Administrative Instructions Sections 503 and 611 and WIPO Standard ST.14. These sections of the Administrative Instructions require reference citations to include, in addition to other information which is apparent from the forms which the examiner fills out, an indication of the two-letter country code of the country or entity issuing or publishing the document and the standard code for identifying the kind of patent document. The discussion which follows is limited to the identification of patent documents (and nonpatent publications) and a listing of the two-letter country codes for countries or other entities which issue or publish industrial property information.

Jump to MPEP SourceSequence Listing FormatSequence Listing Requirements
MPEP GuidanceInformativeAlways
[mpep-1851-9abf22b9f879b25bbe23b460]
Patent Document References Must Include Country Code and Document Type
Note:
Examiners must include the two-letter country code of the issuing entity and the standard code for the type of patent document in reference citations.

The examiner, in completing the international search report as well as the written opinion and international preliminary examination report, is required to cite the references in accordance with the provisions of Administrative Instructions Sections 503 and 611 and WIPO Standard ST.14. These sections of the Administrative Instructions require reference citations to include, in addition to other information which is apparent from the forms which the examiner fills out, an indication of the two-letter country code of the country or entity issuing or publishing the document and the standard code for identifying the kind of patent document. The discussion which follows is limited to the identification of patent documents (and nonpatent publications) and a listing of the two-letter country codes for countries or other entities which issue or publish industrial property information.

Jump to MPEP SourceSequence Listing FormatSequence Listing Requirements
Topic

Publication of Patent Applications

2 rules
MPEP GuidanceRequiredAlways
[mpep-1851-26b02305795534336c35a2bc]
Identification of Patent Documents Must Include Specific Elements
Note:
The rule requires that patent documents include specific elements such as the issuing office, document number, type, patentee name, publication date, and relevant page or figure numbers.
In the case of a patent or published patent application:
  • (A) The Office that issued the document, by the two letter code (WIPO Standard ST.3);
  • (B) The number of the document as given to it by the Office that issued it (for Japanese patent documents the indication of the year of the reign of the Emperor must precede the serial number of the patent document);
  • (C) The kind of document, by the appropriate symbols as indicated on the document under WIPO Standard ST.16 or, if not indicated on that document, as provided in that Standard, if possible;
  • (D) The name of the patentee or applicant (in capital letters, where appropriate, abbreviated);
  • (E) The date of publication of the cited patent document or, in case of a corrected patent document, the date of issuance of the corrected patent document as referred to under INID code (48) of WIPO Standard ST.9 and, if provided on the document, the supplementary correction code as referred to under INID code (15);
  • (F) Where applicable, the pages, columns, lines or paragraph numbers where the relevant passages appear, or the relevant figures of the drawings.
Jump to MPEP SourcePublication of Patent Applications
MPEP GuidanceRequiredAlways
[mpep-1851-1474657958405cef2edac04a]
Page Numbers for Patent Documents Required
Note:
The rule requires providing page, column, line, or paragraph numbers where relevant passages appear in a patent or published patent application.

In the case of a patent or published patent application:

(F) Where applicable, the pages, columns, lines or paragraph numbers where the relevant passages appear, or the relevant figures of the drawings.

Jump to MPEP SourcePublication of Patent Applications

Citations

Primary topicCitation
MPEP § 901.04(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