Derwent World Patents Index

• Primary level data - an electronic form of the original patent. • Bibliographical data - cleaned and formatted patent numbers, inventor, application date etc. data. • DWPI Abstract - a plain English summary of the novel feature, use and advantage of the invention • DWPI manual code / Indexing - a custom taxonomy indicating the novel feature and use. The database is produced by information provider Clarivate Analytics, previously part of Thomson Reuters. ==Special Indexing==

Derwent Manual Codes Derwent produces its own proprietary patent classification codes, called manual codes. The classification system contains subdivisions related to chemical, electrical and mechanical engineering subject matter. Derwent Assignee Codes Derwent indexers add standardized 4-letter codes to DWPI records to represent certain patent-holding companies. These codes are not available for all companies - only the top patent holding companies have these standard Derwent codes. ==History==

Derwent World Patents Index can trace its origin to Delphion patent database, that originated in pre-World Wide Web era. Thomson Reuters acquired Delphion first, and them sold it to Clarivate in 2016. == References ==