Dry wall nail with a frusto-conical walled head and a serrated shank

Claim 1

A ONE-PIECE NAIL HAVING A SHANK PORTION HAVING A POINT AT ONE END AND A CUP-SHAPED HEAD AT THE OTHER END THEREOF INTEGRAL THEREWITH COMPRISING A FRUSTO-CONICAL SHAPED CENTRAL PROJECTION AXIALLY ALIGNING WITH SAID SHANK, HAVING A BASE DIAMETER AT LEAST AS GREAT AS THE DIAMETER OF SAID SHANK AND A THIN ANNULAR FRUSTO-CONICAL WALL OF SUBSTANTIALLY UNIFORM THICKNESS SURROUNDING SAID CENTRAL PROJECTION AND FLARING UPWARDLY AND OUTWARDLY FROM THE BASE OF SAID PROJECTION TO THE PERIPHERY OF SAID HEAD AT AN ACUTE ANGLE TO THE AXIS OF SAID SHANK TO PROVIDE AN ANNULAR V-SHAPED IN CROSS SECTION GROOVE IN SAID HEAD BETWEEN SAID PROJECTION AND WALL EXTENDING TO THE PERIPHERAL EDGE OF SAID HEAD, SAID CENTRAL PROJECTION BEING OF A HEIGHT APPROXIMATELY EQUAL TO THE AXIAL HEIGHT OF SAID WALL TO PREVENT FLATTENING OF SAID HEAD DURING DRIVING, GRIPPING RINGS ON SAID SHANK SPACED FROM BOTH SAID HEADED AND POINTED ENDS OF SAID SHANK, SAID SHANK BEING SMOOTH SURFACED BETWEEN SAID GRIPPING RINGS AND SAID POINTED END, SAID RINGS EXTENDING OVER A LENGTH OF SAID SHANK APPROXIMATELY EQUAL TO THE LENGTH OF SAID SHANK FROM SAID RINGS TO THE END OF THE POINT THEREON AND THE LENGTH OF SAID RINGED SHANK PORTION BEING LESS THAN THE DISTANCE FROM SAID RINGED PORTION TO SAID HEAD.