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Non-technical summaryWe investigate the opposing impacts of two basic effects underlying the decision to patent: the protective and the disclosure effect. On the one hand, patents grant a temporary monopoly to an inventor, and thus, have a positive protective effect. On the other hand, patent law requires the full disclosure of all technological details concerning a patented discovery. As this transfer of enabling knowledge benefits rival firms the profits of the innovator may decrease. Hence, the patenting decision of an inventor has to balance the tradeoff between the benefits of temporary monopoly power, and the drawback of the disclosure. Naturally, the positive effect may be enhanced by stronger property rights while the negative effect is subject to the impact of the disclosure requirement. The presented analysis consists of a theoretical part which is a condensed version of Zaby (2010b) and an empirical test of the theoretical predictions. The theoretical model introduces the patenting decision of a successful inventor into a market with vertically differentiated products. The two considered firms are asymmetric in their capabilities to adopt a new technology. Preceding the adoption decision an inventor faces the choice between a patent and secrecy to protect his discovery. A patent protects a given quality range from the entry of a rival. The main theoretical result is that the inventor will patent his invention whenever his technological headstart is moderate and that he will rather rely on secrecy whenever his technological headstart is high.The empirical analyzes test predictions derived from the theoretical results. Empirical evidence supports the theoretical finding that the validity of a common economic intuition regarding the interplay of technological leadership and the propensity to patent is restricted to industry-specific characteristics: Our findings suggest that the propensity to patent increases with the extent of the technological leadership of an inventor only in industry sectors where the appropriability of an invention, given secrecy as the chosen protective measure, is low. This leads to an increase of the propensity to patent, as the positive protective effect of patenting gains weight. Furthermore, we find evidence that the strength of patent protection has a mitigating effect on the market entry threat perceived by an inventor, so stronger patents may lead to an increasing propensity to patent.Summarizing, this paper provides a poss...