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2016 ; 107
(ä): 701-722
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Obstacles to prior art searching by the trilateral patent offices: empirical
evidence from International Search Reports
#MMPMID27122646
Wada T
Scientometrics
2016[]; 107
(ä): 701-722
PMID27122646
show ga
Despite many empirical studies having been carried out on examiner patent
citations, few have scrutinized the obstacles to prior art searching when adding
patent citations during patent prosecution at patent offices. This analysis takes
advantage of the longitudinal gap between an International Search Report (ISR) as
required by the Patent Cooperation Treaty (PCT) and subsequent national
examination procedures. We investigate whether several kinds of distance actually
affect the probability that prior art is detected at the time of an ISR; this
occurs much earlier than in national phase examinations. Based on triadic PCT
applications between 2002 and 2005 for the trilateral patent offices (the
European Patent Office, the US Patent and Trademark Office, and the Japan Patent
Office) and their family-level citations made by the trilateral offices, we find
evidence that geographical distance negatively affects the probability of capture
of prior patents in an ISR. In addition, the technological complexity of an
application negatively affects the probability of capture, whereas the volume of
forward citations of prior art affects it positively. These results demonstrate
the presence of obstacles to searching at patent offices, and suggest ways to
design work sharing by patent offices, such that the duplication of search costs
arises only when patent office search horizons overlap.