Derwent World Patents Index (DWPI) - EPI ... - Thomson Reuters

Appendix 1: EPI Subject Matter Coverage
Patents are included in EPI in two ways, namely:-
1 automatic inclusion based on the assigned IPC
2 intellectual selection based on technical content
Automatic inclusion criteria
EPI Manual Codes 2011 1211
Part 3
Some sections of the IPC relate to subject matter which is always of relevance to EPI. Thus assignment of
any IPC from section H, will result in inclusion. Patents bearing certain other IPC subsections are also
automatically included, to ensure that all disclosures received by Thomson Reuters can be assigned to at
least one part of our overall classification system. Since some of these IPCs relate to technologies which
are not inherently electrical, this results in the inclusion in EPI of some inventions of a purely mechanical
nature, in the fields of instrumentation and control, for example.
It should be noted that where an IPC is considered to be inappropriate the normal correspondence
between IPC and Thomson Reuters classification does not apply. In some cases, this may necessitate the
assignment by Thomson Reuters of an additional IPC to enable the invention to be covered by the most
suitable class of the General and Mechanical Patents Index, rather than EPI. From 2006 mechanical
patents relating to the transportation area have been intellectually selected for inclusion in EPI.
Below is a list of IPC sections and subsections which normally guarantee the inclusion of a patent in EPI.
For further details of the relation between IPC and EPI classes please refer to Appendix 4, the concise
guide to EPI classification. (For details of the correspondence between IPC and manual codes see
Appendix 3).
A61N
G01
G02B6
G02F
G03G
G04
G05B
G05D
G05F
G06
G07
G08
G09G
G10H
G10L
G11
G12
H