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    Patent classifications as indicators of intellectual organization
    13 years 4 months ago
    Patent classifications as indicators of intellectual organization
    Download  www.leydesdorff.net
    Using the 138,751 patents filed in 2006 under the Patent Cooperation Treaty, coclassification analysis is pursued on the basis of three- and four-digit codes in the International ...
    Loet Leydesdorff
    claim paper
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