What are the Expert search field codes?

Last updated on November 19, 2025

In Expert search you can specify which field(s) you want to include in your search queries.

Note: The field codes that will be displayed depend upon your current database selection(s).

Listed below are the 10 Engineering Village database codes and names.

  • cpx = Compendex
  • ins = Inspec
  • nti = NTIS
  • pch = PaperChem
  • chm = Chimica

  • cbn = CBNB
  • grf = GeoRef
  • geo = GEOBASE
  • upt = Patents Plus
  • knc = Knovel

Below are the field names, their corresponding field codes, and their descriptions. This list is displayed alphabetically in the ‘Field name & description’ column.

 

Field name & description

Field code

cpx

ins

nti

pch

chm

cbn

grf

geo

upt

knc

Abstract

[Summary of the document contents]

"AB"

X

X

X

X

X

X

X

X

X

X

Accession number

[A unique number assigned to each record]

"AN"

X

X

X

X

X

X

X

X

 

X

Affiliation/Assignee

[The affiliation of the corresponding author or the person or organization that has been assigned a patent]

"AF"

X

X

X

X

X

 

X

X

X

 

All fields

[All available fields]

"ALL"

X

X

X

X

X

X

X

X

X

X

Annotation

[Contains comments or explanations regarding a document or part of a document]

"ANN"

 

 

 

 

 

 

X

 

 

 

Astronomical indexing

[Standardized form of the nomenclature of astronomical objects]

"AI"

 

X

 

 

 

 

 

 

 

 

Author/Inventor

[Author name or the inventor(s) names of patented item]

"AU"

X

X

X

X

 

 

X

X

X

X

Availability

[Information about obtaining the document]

"AV"

 

 

X

 

 

X

X

 

 

 

CAS registry number

[Chemical Abstracts Service (CAS) registry numbers are unique numeric identifiers for chemical substances]

"CR"

 

 

 

 

X

X

 

 

 

 

Category

[Subject category]

"CAT"

 

 

 

 

 

 

X

 

 

 

Chemical acronyms

[Acronyms or abbreviations for chemicals]

"CE"

 

 

 

 

 

X

 

 

 

 

Chemical Indexing

[Information about inorganic chemical substances and material systems]

"CI"

 

X

 

 

 

 

 

 

 

 

Chemicals

[Chemical terms]

"CM"

 

 

 

 

 

X

 

 

 

 

Classification code

[A numerical hierarchy of general subject categories]

"CL"

X

X

 

 

 

 

 

X

X

 

CODEN

[A six-character representation of serial titles]

"CN"

X

X

 

X

X

X

X

 

 

 

Collection title

[Title of a non-serial collection]

"VT"

 

 

 

 

 

 

X

 

 

 

Companies

[Company names]

"CP"

 

 

 

X

 

X

 

 

 

 

Conference code

[A number assigned to a conference proceedings record]

"CC"

X

 

 

X

X

 

 

X

 

 

Conference information

[Includes the name, date, location, and sponsor of a conference as well as the conference code number]

"CF"

X

X

 

 

 

 

X

 

 

 

Contract number

[Contract or grant number issued by the federal agency sponsoring the research]

"CT"

 

 

X

 

 

 

 

 

 

 

Controlled term/Subject area

[A subject term used to describe the content of a document in the most specific and consistent way possible]

"CV"

X

X

X

X

X

X

X

X

X

X

Cooperative Patent Classification (CPC) code

[The classification scheme jointly developed by the European Patent Office and the United States Patent and Trademark Office]

"PEC"

 

X

 

 

 

 

 

 

X

 

Country of application

[Author affiliation country]

"PU"

X

 

 

X

 

 

 

 

 

 

Country of origin

[The country of the author affiliation]

"CO"

X

X

X

 

X

X

X

X

X

 

Degree type

[Type of degree awarded for which the dissertation or thesis was presented]

"DE"

 

 

 

 

 

 

X

 

 

 

Discipline

[The five main subject areas covered by Inspec]

"DI"

 

X

 

 

 

 

 

 

 

 

Document type

[Describes the type of source publications from which indexed papers are taken]

"DT"

X

X

X

X

X

X

X

X

 

X

DOI

[The registered DOI (Digital Object Identifier) for electronic documents]

"DOI"

X

X

 

X

X

 

 

X

 

X

First author

[The first author of the document]

"FIRSTAU"

X

X

 

X

 

 

X

X

 

 

Funding acronym

[Acronym of the grant funding sponsor]

"GFA"

X

 

 

X

X

 

 

X

 

 

Funding information

[Contains content from the funding text, as well as the acronym, number, and sponsor fields]

"GFI"

X

X

 

X

X

 

 

X

 

 

Funding number

[Number of the grant or award supporting the work]

"GFN"

X

X

 

X

X

 

 

X

 

 

Funding sponsor

[Sponsor or agency that provides the grant or funding for the work]

"GAG"

X

X

 

X

X

 

 

X

 

 

Geographic terms

[Terms describing a geographic region]

"RGI"

 

 

 

 

 

 

 

X

 

 

Industrial sectors

[Companies that help other companies in shipping, manufacturing, or developing their products]

"GD"

 

 

 

 

 

X

 

 

 

 

International Classification of Standards (ICS) code

[The International Classification of Standards code (ICS classification code) as developed by the International Organization for Standardization (ISO) to classify Standards].

"ICS"

X

 

 

 

 

 

 

 

 

 

International Patent Classification (IPC) code

[The International Patent Classification code as issued by the World Intellectual Property Organization (WIPO)]

"PID"

 

X

 

 

 

 

 

 

X

 

ISBN

[A 13-character (or formerly 10-character) representation of book titles]

"BN"

X

X

 

X

 

X

X

X

 

X

ISSN

[A nine-character alphanumeric representation of serial titles formatted as two sets of four numbers separated by a hyphen]

"SN"

X

X

 

X

X

X

X

X

 

 

Issue

[The issue of the publication in which the document appears]

"SU"

X

X

 

X

X

 

X

X

 

 

Language

[The language of the document is given at the end of the citation if it is other than English]

"LA"

X

X

X

X

X

X

X

X

 

X

Main heading

[Represents the major subject aspect of the document]

"MH"

X

 

 

 

 

 

 

 

X

 

Major term

[Represents an important index term]

"CVM"

X

 

 

 

X

 

 

 

X

 

Map Scale

[The ratio between distance on a map and the corresponding distance on the ground]

"MS"

 

 

 

 

 

 

X

 

 

 

Map Type

[Refers to the map type for fold-out maps, maps in pockets, and individually published maps]

"MP"

 

 

 

 

 

 

X

 

 

 

Material identity number

[An internal Inspec code uniquely identifying the publication issue for serials or the entire publication for non-serials]

"MI"

 

X

 

 

 

 

 

 

 

 

Monitoring agency

[The acronym of the sponsoring organization and may contain a report number as well]

"AG"

 

 

X

 

 

 

 

 

 

 

Notes

[Notes fields that might include information about the title, a description of the document type, or format]

"NT"

 

 

X

 

 

 

 

 

 

 

Numerical indexing

[This text based numerically indexed field (which is only available for the Inspec database) standardizes the manner specific numeric values are expressed by the authors. *Refer to note below this chart for information regarding the numeric search feature].

"NI"

 

X

 

 

 

 

 

 

 

 

Open Access type

[Access type for document (e.g. Open Access)]

"ACT"

X

 

 

 

 

 

 

 

 

 

Original classification code

[Includes the classification used to order and cross-reference the records in the Science Abstracts. This field will include a numeric code when available].

"OC"

 

X

 

 

 

 

 

 

 

 

Patent application country

[The country in which the patent document was filed]

"PCO"

 

 

 

 

 

 

 

 

X

 

Patent application date

[The date on which the application was filed]

"PA"

X

 

X

X

 

 

 

 

X

 

Patent application number

[Identification number assigned to applications that have received a filing date]

"PAM"

 

 

 

 

 

 

 

 

X

 

Patent attorney name

[The name of the legal representative of the patent applicant]

"PAN"

 

 

 

 

 

 

 

 

X

 

Patent authority (office) code

[The patent preliminary examining authority (office)]

"PAC"

 

 

 

 

 

 

 

 

X

 

Patent citation

[All patents that cited the searched patent number]

"PCI"

 

 

 

 

 

 

 

 

X

 

Patent country

[The country in which the patent was published]

"PC"

 

 

 

 

 

 

 

 

X

 

Patent examiner

[The person responsible for examining the patent application]

"PE"

 

 

 

 

 

 

 

 

X

 

Patent filing date

[The date the patent was submitted to the patent office]

"PFD"

 

 

 

 

 

 

 

 

X

 

Patent issue date

[The date the patent was issued]

"PI"

X

 

X

X

 

 

 

 

X

 

Patent number

[The number assigned to a patent]

"PM"

X

 

 

X

 

 

 

 

X

 

Patent priority information

[A unique value assigned to patent applications that may include the priority date, priority document number, and country where the priority was claimed]

"PRN"

 

 

 

 

 

 

 

 

X

 

Priority country

[Patent priority country]

"PRC"

 

 

 

 

 

 

 

 

X

 

Priority date

[Patent priority date]

"PRD"

 

X

 

 

 

 

 

 

X

 

Publication date

[The date in which the patent application was first published]

"PD"

 

 

 

 

 

 

 

 

X

 

Publication year

[The year in which the document was published]

"YR"

X

X

X

X

X

X

X

X

X

X

Publisher

[Identifies publishers or the journals published by a particular publisher]

"PN"

X

X

 

X

X

 

X

X

 

X

Report number

[A unique number assigned to reports]

"RN"

 

 

X

 

 

 

X

 

 

 

SIC codes

[Standard Industrial Classification Codes]

"IC"

 

 

 

 

 

X

 

 

 

 

Source

[Identifies the source of the document]

"SO"

 

X

 

 

 

 

 

 

 

X

Source note

[Free-form text relating to the source of the document]

"SNO"

 

 

 

 

 

 

X

 

 

 

Source title

[Identifies source titles, e.g., journals, books, or conference proceedings]

"ST"

X

X

 

X

X

X

X

X

 

X

Standard ID

[The specific identification number for a Standard document]

"STDID"

X

 

 

 

 

 

 

 

 

 

Subject/Title/Abstract

[Retrieves results from fields, including Abstract, Title, Translated title, Controlled terms, and Uncontrolled terms]

"KY"

X

X

X

X

X

X

X

X

X

X

Title

[Terms within an article's title]

"TI"

X

X

X

 

X

X

X

X

X

X

Treatment type

[Specifies the slant or approach taken in the document]

"TR"

X

X

 

X

X

 

 

 

 

 

Uncontrolled term

[Free language terms; additional entry, or non-preferred, subject terms assigned by indexers. These terms are derived from the abstract and author keywords].

"FL"

X

X

X

X

 

 

X

X

X

 

Volume

[The volume of the publication in which the article appears]

"VO"

X

X

 

X

X

 

X

X

 

 

Note: You may search numeric units of measure values in Compendex and Inspec records using the Numeric index search feature. You may run these numeric search queries via the Expert search form. Additionally, you may use the Numeric filter search feature on the Quick and Expert search forms. Refer to Inspec and Inspec Archive search fields for a comparison of the text based NI field vs. the 62 numerically indexed NU prefixed fields.

Did we answer your question?

Related answers

Recently viewed answers

Functionality disabled due to your cookie preferences

Also available in

简体中文

For further assistance: