FLASH-OF-GENIUS RULE

flash-of-genius rule. Patents. The now-defunct principle that a device is not patentable if it was invented as the result of trial and error rather than a “flash of creative genius.” • The rule, which takes its name from language in Cuno Engineering Corp. v. Automatic Devices Corp., 314 U.S. 84, 91, 62 S.Ct. 37, 41 […]