Saw chain semichisel bit cutter

Claim 1

A SAW CHAIN CUTTER LINK COMPRISING; A BODY PLATE; AND AN INTEGRAL CUTTER TOOTH EXTENDING UPWARDLY FROM THE TOP EDGE OF SAID BODY PLATE; SAID CUTTER TOOTH HAVING A SHANK PORTION LATERALLY OFFSET FROM AND OUTWARDLY INCLINED TO SAID BODY PLATE; A FLATTENED TOE PORTION EXTENDING TRANSVERSELY INWARDLY OF SAID BODY PLATE AT SUBSTANTIALLY A RIGHT ANGLE THERETO; AND A SMALL RADIUS CURVED PORTION JOINING SAID SHANK AND TOE PORTIONS HAVING AN OUTSIDE RADIUS OF CURVATURE LESS THAN THE SUM OF THE INSIDE RADIUS OF CURVATURE PLUS THE THICKNESS OF THE BODY PLATE BUT NO LESS THAN THE THICKNESS OF SAID BODY PLATE; SAID CURVED PORTION HAVING A GREATER THICKNESS THAN SAID SHANK AND TOE PORTIONS; THE FORWARD EDGE OF SAID TOE, SHANK, AND CURVED PORTIONS FORMING A CONTINOUS BEVELED SURFACE; SAID BEVELED SURFACE BEING SHARPENED TO FORM A CONTINUOUS CHISEL CUTTING EDGE AT ITS LEADING EDGE; THE BEVELED SURFACE OF SAID TOE PORTION BEING CONCAVE IN THE DIRECTION OF CUTTING; AND THE BEVELED SURFACE OF SAID SHANK AND CURVED PORTIONS BEING FLAT IN THE DIRECTION OF CUTTING AND PROVIDING A HOOKED CUTTING EDGE; SAID CUTTING EDGE CONFORMING TO A CYLINDRICAL SURFACE SO THAT IT CAN BE SHARPENED WITH A CYLINDRICAL SHARPENING TOOL OF UNIFORM ROUND CROSS-SECTION HAVING A LONGITUDINAL AXIS SUBSTANTIALLY COINCIDENT WITH THE TOE BEVEL AXIS OF CONCAVITY.