In this article, we will establish an estimate for the Gaussian curvature of minimal surfaces in R4 whose classical Gauss map is ramified over the set of distinct points. This is a continuation of previous work of Fujimoto (1993, Aspect of Math., Vieweg, Wiesbaden, Vol. E21)
Osserman-Ru (1997, J. Differ. Geom., Vol. 46, pp. 578-593) and Ha (2014, Differ. Geom. Appl., Vol. 32, pp. 130-138.)