Self-tapping screws with threadforming projections

Claim 1

A SELF-TAPPING FASTENER INCLUDING: (A) A SHANK PORTION HAVING AN ENLARGED UPSET HEAD AT ONE END AND A TAPERED WORK-ENTERING PORTION TERMINATING IN A TIP AT THE OTHER END, (B) SAID SHANK AND WORK-ENTERING PORTIONS BEING PROVIDED WITH A CONTINUOUS HELICAL ROLLED THREAD FORMATION THROUGHOUT SUBSTANTIALLY THE FULL LENGTH THEREOF, (C) THE PITCH DIAMETER CROSS SECTIONS OF SAID ROLLED HELICAL THREAD FORMATION BEING OF CIRCULAR SHAPE THROUGHOUT THE FULL LENGTH OF SAID SHANK AND SAID WORK-ENTERING END PORTIONS, (D) A PLURALITY OF CIRCUMFERENTIALLY SPACED APART DISCRETE THREAD FORMING PROTUBERANCES EXPRESSED FROM THE FLANKS OF THE HELICAL THREAD FORMATION ON SAID WORKENTERING END PORTION AND THROUGHOUT SUBSTANTIALLY THE FULL LENGTH THEREOF, (E) EACH OF SAID PROTUBERANCES IN CROSS SECTION TAKEN IN THE PLANE INTERSECTING SAID PROTUBERANCE AT THE POINT OF GREATEST OFFSET OF SAID PROTUBERANCE FROM THE HELIX OF THE THREAD AND IN A DIRECTION AT RIGHT ANGLES TO THE THREAD HAVING A CROSS SECTIONAL BOUNDARY LINE ALONG AT LEAST ONE SIDE THEREOF EXTENDING SUBSTANTIALLY PARALLEL WITH SAID SUBSTANTIALLY UNIFORMLY OFFSET FROM THE FLANK OF THE THREAD IMMEDIATELY FORWARD THEREOF IN THE DIRECTION TOWARD THE TIP OF SAID WORK-ENTERING END PORTION, (F) THE SURFACE OF THE PROTUBERANCE ON AT LEAST THE FORWARD SIDE THEREOF IN THE DIRECTION TOWARD SAID TIP SLOPING SMOOTHLY AND GRADUALLY FROM THE FLANK OF SAID THREAD TO SAID BOUNDARY LINE, (G) THE CRESTS OF SAID PROTUBERANCES FROM SAID TIP TO SAID SHANK INCREASING IN DISTANCE PROGRESSIVELY RADIALLY OUTWARDLY FROM THE SCREW AXIS AND THE CREST OF THE PROTUBERANCE NEXT ADJACENT THE SHANK PORTION BEING SUBSTANTIALLY THE SAME DISTANCE RADIALLY OUTWARDLY FROM SAID AXIS AS THE CREST OF THE THREAD ON SAID SHANK PORTION AND ALSO OF SUBSTANTIALLY THE SAME CROSS-SECTIONAL SHAPE AND DIMENSIONS.