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New on STN

February 2020

New legal event data from Croatia, Italy, and Poland in INPADOCDB and INPAFAMDB

January 2020

Changes to Derwent WPI Update numbering and the total number of annual DWPI updates

December 2019

Derwent World Patents Index: Manual Code revision 2020

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 Summary Sheet


Producer:IFI CLAIMS® Patent Service, a division of Fairview Research LLC
Coverage:Current data
File Size:More than 441,600 records (02/2016)
Updates:Classes and index records are reloaded as needed;
Uniterms are reloaded as needed
File Type:Directory
Content:U.S. patents
STN Easy:Yes

The IFI Uniterm and U.S. Class Reference file is a special reference file for the other IFI files. IFIREF contains U.S. Patent Office (USPTO) classification codes and titles, plus authority data for general, fragment and compound Uniterms. Sources for IFIREF include the USPTO Manual of Classification, Uniterm Authority Lists, and IFI Compound Term Vocabulary. Classification codes, indexing terms, chemical names, molecular formula information, national patent classification codes, and Uniterm codes are all searchable. There are 3 thesauri available: Controlled Term (/CT), Fragment Code (/FG), and Uniterm (/UN).


IFI CLAIMS(R) Patent Services,
a division of Fairview Research LLC
P.O. Box 1148
Madison, CT 06443, USA
Phone: (+1) 203 779-5301
Fax: (+1) 203 583-4521
Email: info(at)ificlaims(dot)com

Usage Terms

The following use and distribution restrictions apply to your use of the IFIREF File on STN. All copyrights are reserved.

Unless specified otherwise in these RESTRICTIONS, CUSTOMER may use copyrighted search results in the following ways:

  1. in copyrighted scientific publications when search results are incidental to the publication and
  2. in reports to a Government Agency that are required by law or by administrative rule. Search results delivered to CUSTOMER in computer-readable form remain the property of the Database Producer.

Unless specified otherwise in these RESTRICTIONS, Recipient may use search results in computer-readable form for the following purposes:

  1. editing or changing the format of search results to create search terms for use with search files or systems;
  2. combining search results with output from other searches, files, or systems to create a consolidated file of search results;
  3. editing the search results to remove irrelevant answers or to change the format of such results.

Recipient shall not use computer-readable search results as a database or part of a database from which hits are selectively retrieved by programmed search, unless Recipient has purchased the right to store search results using the ARCHIVE command or keyword.
Recipient may create one printed copy of search results from a computer-readable file of search results at no additional charge.
Recipient must destroy the computer-readable search results upon creation of the printed version, unless Recipient has purchased the right to archive records with the ARCHIVE command or keyword.
Recipient may purchase the right to redistribute search results to additional users using the REDISTRIBUTE command or keyword.

Enter HELP SHARETERMS for detailed information on the STN Information Keep & Share Program, which allows Recipients to purchase the right to archive and / or redistribute search results from STN databases for internal re-use. Or, visit the STN Information Keep & Share Program.

Recipient shall obtain Database Producer's specific written permission for any uses of computer-readable search results other than those listed here.