Medina-Moreno, L.R. and López-García, S.M. 2023. Technological innovation in Spain: an analysis based on patents from the United States Patent and Trademark Office (1976 – 2019). INNOVA Reseach Journal. 8, 3 (Sep. 2023), 71–91. DOI:https://doi.org/10.33890/innova.v8.n3.2023.2298.