Patent ID: 8291602

Claim:
A composite utility knife blade, comprising: a first edge, a second edge, a third edge located on an opposite side of the blade relative to the second edge, and a fourth edge defining at least one cutting edge located on an opposite side of the blade relative to the first edge; first and second metal portions, wherein the first metal portion extends between the first edge and the second metal portion, extends between the second edge and the third edge, forms a backing extending from approximately one end of the at least one cutting edge to the other, and is formed of a steel heat treated to a hardness within the range of approximately 38 Rc to approximately 52 Rc, and the second metal portion defines the at least one cutting edge and extends between the second edge and the third edge, and is formed of a tool steel heat treated to a hardness within the range of approximately 60 Rc to approximately 75 Rc; a weld region joining the first and second metal portions and extending throughout an interface between the first and second metal portions from approximately the second edge to approximately the third edge of the blade; and further defining at least one notch formed in the first edge.