Patent ID: 8162249

Claim:
A wood chipper knife comprising: a knife body having longitudinal and transverse dimensions and first and second opposed side surfaces each of which includes cutting edge surface portions which intersect at an acute angle to form at least one longitudinally extending cutting edge, wherein: the cutting edge surface portion on the first side surface of the knife is formed as a raised edge portion at an area closest to said at least one cutting edge, extends inwardly from the cutting edge, terminates at a shoulder extending parallel to and facing away from the cutting edge, defines a clearance step surface on the knife behind the shoulder with respect to the adjacent portion of the first side surface; said raised edge portion being machined to have working stripes therein which are generally transverse to the longitudinal dimension of the knife body and at an angle to the cutting edge; and at least a portion of said first side surface of the knife body, inwardly of the clearance step, having a raw, unworked surface, or working stripes machined therein in the longitudinal direction of the knife body substantially parallel to the cutting edge.