Catalina Martinez, from IIP - Madrid recently published in OECD's STI working paper series a document titled insight into different types of patent families" containing an exaustive overview of the different patent families definitions, an impact analisys of adopting one definition or another and a deep numeric analisys based on patstat.
One citation: "most definitions will give the same results for 75% of the families. In particular, equivalents, single-priority families and extended patent families will effectively provide the same results for families characterised by one single parent and direct subsequent filings."
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