Even if Patstat provides only citation file by publications, lots of scientific literature uses citations across patent families as a more relevant measure for knowledge spillovers, patent value etc. since, compared to sheer publication based citation count, it normalizes the data across patent offices.
Nevertheless two caveat should be taken in count when using patent family based citation measures
1) Cross citation may happen
consider example below: all is fine until we look at publications. When using docdb families a crosscitation arises.
These cases are about 581779 (0,5% of total citations).
2) self citations are not uncommon
262781 citations @ 2014b edition are within the same docdb family (0.2 %)
Nevertheless two caveat should be taken in count when using patent family based citation measures
1) Cross citation may happen
consider example below: all is fine until we look at publications. When using docdb families a crosscitation arises.
citing
|
cited
|
citing fam
|
cited fam
|
US7507793
|
US7534577
|
26973151
|
26947173
|
US7534577
|
US7402400
|
26947173
|
26973151
|
These cases are about 581779 (0,5% of total citations).
2) self citations are not uncommon
262781 citations @ 2014b edition are within the same docdb family (0.2 %)
citing
|
cited
|
citing fam
|
cited fam
|
US7534577
|
WO02064631
|
26947173
|
26947173
|
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