Evolución temporal del impacto tecnológico de las patentes mexicanas: una aplicación del algoritmo de expectativas/Temporal evolution of the technological impact of Mexican patents: An application of the expectation-maximization algorithm

Aurora A. Ramírez à Lvarez and Diana Terrazas Santamaría
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Aurora A. Ramírez à Lvarez: El Colegio de México, A.C.
Diana Terrazas Santamaría: El Colegio de México, A.C.
Authors registered in the RePEc Author Service: Aurora Alejandra Ramírez-Álvarez and Diana Terrazas-Santamaría

Estudios Económicos, 2020, vol. 35, issue 1, 37-69

Abstract: In this paper, we use the methodology of Clarkson et al. (2007) to analyze the patterns of citations of Mexican patents registered during 1968-2017 in the United States. Using an expectation-maximization algorithm and patent citations as an indicator of their utility, we find three groups of different citation pattern profiles: "Fast" receives the highest number of citations at a very early stage of their life (5 years), compared to "Medium" (10) and "Slow" (20). Moreover, the group "Fast" is associated with the most recent patents, with the lowest proportion of Mexican owners and inventors, and the highest economic value.

Keywords: patents; technological impact; networks; expectation-maximization algorithm; innovation (search for similar items in EconPapers)
JEL-codes: D89 O31 O33 (search for similar items in EconPapers)
Date: 2020
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