Leviton Manufacturing Co., Little Neck, N.Y., recently announced it has filed a second lawsuit against Universal Security Instruments, Inc. (USI), an importer of ground fault circuit interrupters (GFCIs). The suit was filed in the U.S. District Court of Maryland and states that USI is willfully infringing patents covering the lockout feature used in Leviton’s SmartLock GFCI, a design feature that
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