49:, the grouping of patent documentation recorded at the various patent offices as protection of an invention is sought around the world. Each patent family is grouped around a Basic Patent, which is usually the first published example of the invention. All subsequent filings are referred back to the Basic Patent, and are referred to as Equivalent Patents. On this basis, the database has some 20 million "inventions", corresponding to tens of millions of patents, with almost a million new inventions added each year. From 2008, the number format of the Basic Patent Identifier (the
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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.
53:) changed, to allow up to 3.6 million records per year to be added, as the previous format only allowed a maximum of 1 million new records a year. This is due to the steady increase in unique patents filed each year.
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codes, called manual codes. The classification system contains subdivisions related to chemical, electrical and mechanical engineering subject matter.
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described in a patent and is indexed into alphanumeric technology categories to allow retrieval of relevant patent documents by users.
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338:"Delphion: A World Class Patent Database - A Comprehensive Analysis from Patent Information Professional's Perspective"
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Derwent World
Patents Index can trace its origin to Delphion patent database, that originated in pre-
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Bibliographical data - cleaned and formatted patent numbers, inventor, application date etc. data.
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DWPI Abstract - a plain
English summary of the novel feature, use and advantage of the invention
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Raturi, Mamta Kumari; Sahoo, Prabhat Kumar; Tiwari, Amit Kumar (2009-11-21).
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Compiled in
English by editorial staff, the database provides a short
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Primary level data - an electronic form of the original patent.
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151:"Derwent World Patents Index (DWPI) - Worldwide Patent Search"
182:"STN International: Derwent World Patents Index (DWPI)"
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79:The database is produced by information provider
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27:applications and grants from 44 of the world's
129:acquired Delphion first, and them sold it to
213:"STN International: WPINDEX / WPIDS / WPIX"
45:Each record within the database defines a
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71:DWPI manual code / Indexing - a custom
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75:indicating the novel feature and use.
38:detailing the nature and use of the
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23:(DWPI) is a database containing
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163:from the original on 2022-06-28
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306:"Value Add Guides - Science"
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21:Derwent World Patents Index
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244:"DWPI Reference - Science"
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29:patent issuing authorities
343:SSRN Electronic Journal
275:"User Guides - Science"
402:Patent search services
108:Derwent Assignee Codes
102:patent classification
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352:10.2139/ssrn.1510630
96:Derwent Manual Codes
81:Clarivate Analytics
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370:– via
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57:Basic format
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386:Categories
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198:2010-08-31
167:2021-08-04
137:References
397:Clarivate
360:1556-5068
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133:in 2016.
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40:invention
161:Archived
73:taxonomy
36:abstract
368:1510630
117:History
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.