Patent ID: 7552608

Claim:
A lock system comprising: one or more keys including a generally flat-sided blade, said blade having a top edge, a bottom edge, and opposite sides for receiving grooves and ridges which define a cross-sectional shape of the blade, wherein the blade is divided into three or more sections between the bottom edge and the top edge, and wherein the sections comprise: a first section having a registry groove for registering the key blade by holding the key blade in a reference position during machining of the blade; a second section having a groove; and a third section having on a first side thereof only curved longitudinal grooves and ridges both defining a curvilinear profile, and on a second side thereof grooves with only substantially rectangular or straight angular shapes; and one or more locks having a keyway for receiving the key blade of said key, said blade being constructed and arranged to operate said lock, and wherein said keyway is divided into three or more sections along its height, said sections comprising: a first section having a ridge conforming to the registry groove of the first section of said blade; a second section having a ridge conforming to the groove of the second section of said blade; and a third section having on a first side thereof only curved ridges and grooves conforming to the curved grooves and ridges, respectively, of the first side of the third section of said blade, and on a second side thereof ridges with only substantially rectangular or straight angular shapes conforming to the grooves of the second side of the third section of said blade.