Knowledge networks from patent data: Methodological issues and research targets
The economic literature on technical change has increasingly relied upon patent citation data to measure inter-personal knowledge flows. Many doubts exist on whether patent citations really reflect the designated inventors’ knowledge of both their technical fields, and of the other inventors and experts therein: citations, in fact, come mainly from the patent examiners, and possibly the patent applicant’s lawyers, rather than from inventors themselves. Unfortunately, most of the papers dedicated to discussing these interpretation issues deal with USPTO data, whose citation rules are quite exceptional if compared to those of other patent offices. In addition, some confusion exists between the two issues of awareness (whether citing inventors actually knew of the cited patents) and existence of a knowledge flow (whether some information on the contents of the cited patents has however reached the, possibly unaware, citing inventor). Questionnaires addressed to inventors are severely affected by this confusion, and can hardly dispel the existing doubts. We then propose to apply social network analysis to derive maps of social relationships between inventors, and measures of social proximity between cited and citing patents. Logit regressions demonstrate that the probability to observe a citation is positively influenced by such proximity. In order to perform such regressions,however,a specific sampling scheme has to used, which we also illustrate and discuss.
|Date of creation:||Jan 2004|
|Date of revision:||Jan 2004|
|Contact details of provider:|| Postal: |
Web page: http://www.kites.unibocconi.it/
|Order Information:|| Postal: E G E A - via R. Sarfatti, 25 - 20136 Milano -Italy|
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Adam B. Jaffe & Manuel Trajtenberg & Rebecca Henderson, 1992.
"Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations,"
NBER Working Papers
3993, National Bureau of Economic Research, Inc.
- Jaffe, Adam B & Trajtenberg, Manuel & Henderson, Rebecca, 1993. "Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations," The Quarterly Journal of Economics, MIT Press, vol. 108(3), pages 577-98, August.
- Jaffe, A.B. & Trajtenberg, M., 1992. "Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations," Papers 14-92, Tel Aviv.
- Peter Thompson & Melanie Fox Kean, 2004.
"Patent Citations and the Geography of Knowledge Spillovers: A Reassessment,"
0401, Florida International University, Department of Economics.
- Peter Thompson & Melanie Fox-Kean, 2005. "Patent Citations and the Geography of Knowledge Spillovers: A Reassessment," American Economic Review, American Economic Association, vol. 95(1), pages 450-460, March.
- Sorenson, Olav & Fleming, Lee, 2004. "Science and the diffusion of knowledge," Research Policy, Elsevier, vol. 33(10), pages 1615-1634, December.
When requesting a correction, please mention this item's handle: RePEc:cri:cespri:wp150. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Valerio Sterzi)
If references are entirely missing, you can add them using this form.