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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520 |a Derwent world patents index has editorially enhanced information on more than 20 million patent families. 
588 |a Description based on electronic file viewed May 26, 2014. 
650 0 |a Patent searching  |v Indexes  |v Databases. 
650 0 |a Patents  |v Indexes  |v Databases. 
650 0 |a Patents (International law) 
650 0 |a Patent laws and legislation. 
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856 4 0 |3 Coverage: 1963 to present  |u https://www.westlaw.com/Browse/Home/IntellectualProperty/DerwentWorldPatentsIndex?rs=tran3.0&vr=3.0&originationContext=vendcc 
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