Derwent world patents index.

Derwent world patents index has editorially enhanced information on more than 20 million patent families.

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Bibliographic Details
Format: Online
Language:English
Published: [St. Paul, Minnesota] : Thomson Reuters, [2010-]
Subjects:
Online Access:Coverage: 1963 to present
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Description
Summary:Derwent world patents index has editorially enhanced information on more than 20 million patent families.
Physical Description:1 online resource
Publication Frequency:Updated periodically