Key Patents and Economic Performance: Patent Quality, Technological Innovation, and Growth in Knowledge-Based Economies

In knowledge-based economies, technological innovation capability, intangible assets, and intellectual property are becoming increasingly important for long-term economic performance. Patent data are widely used as indicators of innovation; however, simple patent counts do not adequately capture the quality, technological relevance, or international market coverage of individual patents. This paper therefore examines the extent to which key patents can serve as a quality-oriented indicator of technological innovation capability for analysing economic performance. Key patents are understood as particularly high-quality patents in relevant key technologies, whose patent strength derives from technological relevance and international market coverage. The paper combines a conceptual analysis of the key patent approach with literature from growth and innovation economics, as well as with an exploratory empirical plausibility assessment based on a global patent dataset on world-class patents in future technologies (Breitinger et al., 2020). Economic performance is operationalised empirically through per capita income. The empirical evidence is assessed from two complementary perspectives: an international cross-section of high-income economies and a dynamic analysis of the United States, which held a particularly prominent position in high-quality patenting across key future technologies during the period under observation. In both perspectives, the findings point to a positive association between key patents and per capita income. They should not, however, be interpreted as evidence of causality, but as empirically grounded support for the plausibility of this relationship. The contribution of this paper lies in positioning key patents as a differentiated innovation indicator that takes patent quality, technological relevance, and international reach more fully into account than mere patent volumes. The key patent approach thus offers a scientifically grounded perspective on innovation capability and economic performance in knowledge-based economies.