Patent ID: 8284008

Claim:
A fluorescent lighting ballast choke coil device comprising, at least a pair of laminated core stacks; at least a pair of winding coils; said laminated core stacks comprises two or more sets of multi-layers of laminates being inserted into the winding coils to form a complete loop for magnetic flux to flow, all the winding coils are activated simultaneously by inducing magnetic flux in a unidirectional flow, wherein the laminated core stacks include a pair of U-U laminated cores, each of the U-U laminated cores has a U-shape and includes legs with an offset leg length, the U-U laminated cores have an orientation defined by an orientation mark including one or more cutting grooves on the laminates, the U-U laminated cores are positioned to form an air gap between one leg of one of the U-U laminated cores and one leg of another of the U-U laminated cores, and the pair of U-U laminated cores forms a complete full loop in a ballast device construction for magnetic flux flow within the laminates.