Rotary well bits

Claim 1

A ROTARY WELL BIT INCLUDING A HEAD, MEANS ON THE HEAD FOR CONNECTING THE BIT TO MEANS FOR ROTATING THE BIT IN A WELL BORE, AT LEAST TWO CUTTER SHANKS DEPENDING FROM THE HEAD AT AN ANGLE OF APPROXIMATELY 39* WITH RESPECT TO A PLANE AT RIGHT ANGLES TO THE LONGITUDINAL AXIS OF THE BIT, AND A CUTTER CONE REVOLVABLY MOUNTED ON EACH OF THE CUTTER SHANKS, EACH OF THE CUTTER CONES HAVING A CONICAL CUTTING FACE AND AN OUTER BASE MARGIN, EACH OF THE CUTTER CONES HAVING ON ITS CONICAL CUTTING FACE A PLURALITY OF DISCRETE DRILLING ELEMENTS SPACED APART FROM ONE ANOTHER BOTH CIRCUMFERENTIALLY AND AXIALLY AND COVERING SUBSTANTIALLY THE ENTIRE CUTTING FACE, EACH OF THE CUTTER CONES ALSO HAVING AT THE BASE OF ITS CONICAL CUTTING FACE ONLY A SINGLE CIRCUMFERENTIAL GROOVE OR RECESS HAVING INNER AND OUTER WALLS, THE INNER WALLS OF THE GROOVES BEING FORMED BY THE OUTERMOST DRILLING ELEMENTS ON THE CUTTER CONES, THE OUTER WALLS OF THE GROOVES INTERSECTING THE BASE MARGINS OF THE CUTTER CONES TO FORM RELATIVELY SHARP CUTTING EDGES EXTENDING CIRCUMFERENTIALLY OF THE CONICAL FACES AT SAID BASE MARGINS AND DISPOSED RADIALLY OUTWARDLY OF THE DRILLING ELEMENTS ON THE CUTTER CONES.