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Cockburn Wagner (2007) - Patents And The Survival Of Internet Related Ipos (view source)
Revision as of 18:50, 25 March 2013
, 18:50, 25 March 2013no edit summary
:''"Our results suggest that the firms that were unable or unwilling to seek patent protection were much less likely to survive the collapse of the dot.com bubble 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:
