Patent Pledge and Technological Innovation: The “Good Faith” of Tesla

In June 2014, Tesla publicly pledged not to assert its patents against users acting in good faith, aiming to promote the diffusion of electric vehicle technologies. This study provides the first empirical investigation of a firm-initiated patent pledge covering the pledgor’s entire patent portfolio and evaluates its consequences for both the firm’s own innovation and follow-on innovation. The results show that Tesla’s patent pledge significantly increased technological similarity between Tesla and subsequent innovators and led to a marked rise in Tesla’s patenting activity. In contrast, the pledge did not increase the number of follow-on innovations. These patterns suggest that although the pledge lowered formal access barriers, the good faith condition introduced appropriability concerns that limited entry while steering innovation toward technological areas aligned with Tesla’s core business. Overall, the findings indicate that patent pledges with retained control can function less as pure diffusion mechanisms and more as strategic instruments for shaping innovation trajectories and ecosystem development. The paper provides implications for managers considering patent pledges as part of their strategic toolkit and for policymakers assessing the long-term competitive and social effects of conditional royalty-free licensing.