CEDAR RAPIDS — An Iowa man was sentenced Wednesday to more than three years in federal prison for stealing trade secrets from DuPont for a competitor in the ethanol fuel industry and lying to federal agents.Josh Harry Isler, 55 of St. Ansgar, pleaded guilty last July in U.S. District Court to one count of theft of trade secrets and one count of making false material statements to the Federal Bureau of Investigation.As part of the plea agreement, Isler admitted during August 2013, while he was employed with DuPont, which has facilities in Cedar Rapids, and after he accepted a job offer from a smaller competitor, he stole trade secrets of DuPont.