Manual Coding System Revision

Derwent World Patents Index Electrical Patents Index (EPI) and Chemical Patents Index (CPI) Manual Code and Fragmentation Code Revision

What are these coding systems?

EPI Manual Codes
The Electrical Patents Index Manual Codes (EPI manual codes) system is a hierarchical classification and indexing system, intended for use as an online retrieval tool for abstracts of Electrical and Electronic engineering patents.

CPI Manual and Fragmentation Codes
The Chemical Patents Index Manual Codes (CPI Manual Codes) and Fragmentation Codes system is a hierarchical classification and indexing system, intended for use as an online retrieval tool for abstracts of Chemical and Biological patents.

How often are these codes revised?

CPI Manual Codes and EPI Manual Codes are revised annually (in consultation with customers) to accommodate changes in technology, provide finer subject matter breakdown and thus improve information retrieval.

EPI Manual Codes
Since their introduction in 1980, the EPI Manual Codes have been revised 16 times (in consultation with customers) to accommodate changes in technology, provide finer subject matter breakdown and thus improve information retrieval.

CPI Manual and Fragmentation Codes
Since the introduction of Section B Manual and Fragmentation codes in 1963 and Section C codes in 1965, 20 CPI coding revisions have taken place (in consultation with Customers) to accommodate changes in technology, provide finer subject matter breakdown and thus improve information retrieval. 2015 saw the first major revision of DWPI Non-Structural Fragmentation Codes since 1981.

Why are Manual and Fragmentation Codes important?

These codes cover both the novel technical details disclosed within the patent, and the invention's application. They enable an extra level of precision and accuracy when searching patent information.

Why is it important to revise Manual Codes?

We believe that it is critical to index our patent information in line with technological developments, to help our customers find the information they need with precision and accuracy, as easily as possible.

2017 Manual Code Revision

Please see the suggested revisions for 2017 in the below documents. Please send any feedback to scientific.mcrdwpi@thomsonreuters.com by 23rd September 2016.

CPI Proposed Changes 10 KB
GMPI and EPI Proposed Changes 25 KB

Submit Your Suggestions

If you would like to submit a suggestion for possible inclusion in the 2017 DWPI Manual Code Revision, please contact us via email at: scientific.mcrdwpi@thomsonreuters.com or via the following form(s):

DWPI CPI Manual Code Suggestions

DWPI EPI Manual Code Suggestions


Additional Information

DWPI Manual Code Revision Overview 272 KB

Application Examples

Metallocenes 37 KB
Short Interfering RNA 23 KB
Application Frequency Analysis 52 KB

More Information

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Previous Revisions