IDEAS home Printed from
MyIDEAS: Log in (now much improved!) to save this paper

International knowledge diffusion and home-bias effect. Do USPTO and EPO patent citations tell the same story?

Listed author(s):
  • Emanuele Bacchiocchi


    (University of Milan, Milano, Italy)

  • Fabio Montobbio


    (Insubria University, Varese, and KITeS, Universita' Bocconi, Milano, Italy)

This paper estimates the international diffusion and obsolescence of technological knowledge by technological field and country using patent citations from the U.S. Patent and Trademark Office (USPTO) and from the European Patent Office (EPO). We control for self-citations and for procedural and legal differences between patent offices in the citation procedures using equivalent patents. We show that (1) both at the EPO and USPTO domestic citations come sooner and there is a strong localization effect of patent citations at national level; (2) the US technological system is becoming less central in the international web of knowledge flows; (3) some differences across patent offices emerge in the ranking by technological fields in the speed of diffusion and decay of technological knowledge. We support the conjecture that not only technological opportunities but also absorptive capacity plays a role. Finally on the methodological side we show that at the USPTO the median citation lag is twice as large relatively to the citations at the EPO, that some bias is induced by the different institutional practices at the EPO and USPTO and that using patent families generates a selection bias towards high quality patents.

If you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.

File URL:
Download Restriction: no

Paper provided by KITeS, Centre for Knowledge, Internationalization and Technology Studies, Universita' Bocconi, Milano, Italy in its series KITeS Working Papers with number 015.

in new window

Length: 40 pages
Date of creation: Feb 2009
Date of revision: Feb 2009
Handle: RePEc:cri:cespri:kites15_wp
Contact details of provider: Postal:
via Sarfatti, 25 - 20136 Milano - Italy

Phone: +39.025836.3397
Fax: +39.025836.3399
Web page:

Order Information: Postal: E G E A - via R. Sarfatti, 25 - 20136 Milano -Italy

References listed on IDEAS
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.:

in new window

  1. Luis A. Rivera-Batiz & Paul M. Romer, 1991. "Economic Integration and Endogenous Growth," The Quarterly Journal of Economics, Oxford University Press, vol. 106(2), pages 531-555.
Full references (including those not matched with items on IDEAS)

This item is not listed on Wikipedia, on a reading list or among the top items on IDEAS.

When requesting a correction, please mention this item's handle: RePEc:cri:cespri:kites15_wp. 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 you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

If references are entirely missing, you can add them using this form.

If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.

If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.

Please note that corrections may take a couple of weeks to filter through the various RePEc services.

This information is provided to you by IDEAS at the Research Division of the Federal Reserve Bank of St. Louis using RePEc data.