7,613
edits
Changes
Jump to navigation
Jump to search
FirmThis article does not focus on patent thickets, but on the impact of firm-level patent holdings on firm survival after IPOs during the dot.com boom. The key firm-level patentingmeasures considered include:
Thickness of Other measures considered that may indirectly relate to patent families where firm has patentedthickets are: *Average number of USPTO patents held by firms in same patent family size associated with patents where as firms have patentsanalyzed.
Result magnitude:
Cockburn Wagner (2007) - Patents And The Survival Of Internet Related Ipos (view source)
Revision as of 19:14, 29 September 2020
, 19:14, 29 September 2020no edit summary
{{Article
|Has page=Cockburn Wagner (2007) - Patents And The Survival Of Internet Related Ipos
|Has bibtex key=
|Has article title=Patents And The Survival Of Internet Related Ipos
|Has author=Cockburn Wagner
|Has year=2007
|In journal=
|In volume=
|In number=
|Has pages=
|Has publisher=
}}
*This page is referenced in the [[Patent Thicket Literature Review]]
*This page is listed on the [[PTLR Core Papers]] page
===Measures of thicket===
*Number of USPTO patent applications and grants
*Counts of European and Japanese patent applications and grants
*Number of forward citations per claim (counting 7 plus cites).
===Sample===
===Results===
:''"Our results suggest that the ¯rms firms that were unable orunwilling to seek patent protection were much less likely to survive the collapse of the dot.combubble after 2001."''
*Having filed at least 1 patent application reduces de-listing (increasing survival) by 34%, with another 5% for each additional patent, which is associated with de-listing due to acquisition rather than business failure.
*No significant results for (‘705) business method patents.
===Social Welfare Consequences: ===
*There are private firm benefits from holding more patents, but not business method patents.
*Although tested, no impact on firm survival from quality of patents held, or from thickness of related patent families outside of firm.
===Dependent Variable: and Model===
*Firm survival as measured by length of listing period (from date of IPO and date of de-listing on NASDAQ due to failure or acquisition).
*Proportional hazard models are used to relate firm survival to patenting measures, controlling for:
