von Wartburg I; Teichert T; Rost K "Inventive progress measured by multi-stage patent citation analysis " RESEARCH POLICY 34 (10): 1591-1607 Dec. 2005

[Eugene Garfield]

Wartburg at econ.uni-hamburg.de

DOI: 10.1016/J.RESPOL.2005.08.001


Author: von Wartburg I; Teichert T; Rost K

Title : Inventive progress measured by multi-stage patent citation analysis

Source: RESEARCH POLICY 34 (10): 1591-1607 Dec. 2005.

Address
 Univ Hamburg, D-20146 Hamburg, Germany.
Univ Zurich, Zurich, Switzerland.

Reprint
 von Wartburg, I, Univ Hamburg, Von Melle Pk 5, D-20146 Hamburg, Germany.

E-mail :  Wartburg at econ.uni-hamburg.de

Abstract
 Studies of technological change constitute a field of growing importance
and sophistication. In this paper we contribute to the discussion with a
methodological reflection and application of multi-stage patent citation
analysis for the measurement of inventive progress. Investigating specific
patterns of patent citation data, we conclude that single-stage citation
analysis cannot reveal technological paths or lineages. Therefore, one
should also make use of indirect citations and bibliographical coupling. To
measure aspects of cumulative inventive progress, we develop a "shared
specialization measure" of patent families. We relate this measure to an
expert rating of the technological value added in the field of variable
valve actuation for internal combustion engines. In sum, the study presents
promising evidence for multi-stage patent citation analysis in order to
explain aspects of technological change. (c) 2005 Elsevier B.V. All rights
reserved.

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