Espacenet
Espacenet: free access to the database of over 90 million patents
Did you know that...
.... Espacenet automatically hides duplicate patent documents in your result list? This is because it displays only one patent document per family, so the total number of results you get initially may well decrease as you click through the list. The technical term for this is "deduplication".
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Espacenet: Intro
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Cooperative Patent Classification: Intro
