This report provides a synthesis of a series of recent patent analyses carried out for the Office of Energy Efficiency & Renewable Energy (EERE) in the U.S. Department of Energy (DOE). These analyses trace the influence of patents in twenty different research portfolios selected by nine EERE research and development (R&D) offices for the period 1976-2018. There are two main objectives of the analyses described in this report: to locate key patents awarded for EERE office-funded innovations; and to determine the extent to which EERE-funded research has influenced subsequent technological developments associated with other organizations. The study measures this influence primarily by tracing citation links between successive generations of patents.