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:''"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."''
Result magnitude:
*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:
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