Axial flow compressor, blower or ventilator with reduced noise production

Claim 1

AN AXIAL COMPRESSOR, BLOWER, OR VENTILATOR HAVING A SET OF ROTOR BLADES AND A SET OF STATOR BLADES, SAID BLADES SATISFYING THE RELATIONSHIP S=$/$0>0.65, WHEREIN R IS THE CHARACTERISTIC CROSSING VALUE OF ONE OF SAID SETS BY THE OTHER SET, AND RO IS THE PITCH OF THE BLADES OF SAID OTHER SET, (1) THE BLADES OF EACH SET BEING SPACED ABOUT A COMMON AXIS AND EXTENDING RADIALLY BETWEEN A ROOT CIRCLE NEAR SAID AXIS AND A TIP CIRCLE REMOTE FROM SAID AXIS, SAID CIRCLES BEING CENTERED IN SAID AXIS, SAID PITCH BEING THE CIRCUMFERENTIAL SPACING OF ADJACENT BLADES OF THE OTHER SET AS MEASURED ON SAID TIP CIRCLE, (2) SAID CHARACTERISTIC CROSSING VALUE BEING THE CIRCUMFERENTIAL SPACING OF TWO LINES PROJECTED ON A PLANE PERPENDICULAR TO SAID AXIS, SAID SPACING BEING MEASURED ON SAID TIP CIRCLE, SAID PROJECTED LINES INTERSECTING IN SAID ROOT CIRCLE, (3) ONE OF SAID PROJECTED LINES BEING AN AXIAL PROJECTION OF A LINE OF INTERSECTION BETWEEN A SURFACE OF ROTATION ABOUT SAID AXIS AND A PLURALITY OF RADIALLY SPACED TRAILING RAYS OF ONE OF THE BLADES OF SAID OTHER SET, EACH TRAILING RAY BEING DEFINED BY THE POINT OF INTERSECTION OF THE CHAMBER LINE OF SAID ONE BLADE WITH THE TRAILING EDGE OF SAID ONE BLADE IN THE AIRFOIL SECTION OF SAID ONE BLADE AND BY A POINT ON SAID CAMBER LINE SPACED FROM SAID TRAILING EDGE TOWARD THE LEADING EDGE OF SAID ONE BLADE A DISTANCE EQUAL TO ONE FOURTH OF THE LENGTH OF THE CHORD BETWEEN SAID CAMBER LINE AND SAID LEADING EDGE, SAID DISTANCE BEING MEASURED ALONG SAID CHORD, (4) THE OTHER ONE OF SAID PROJECTED LINES BEING AN AXIAL PROJECTION OF THE LEADING EDGE OF ONE BLADE OF THE OTHER SET, (5) SAID SURFACE OF ROTATION BEING DEFINED BY SAID LEADING EDGE OF THE LAST-MENTIONED BLADE WHEN SAID OTHER SET ROTATES ABOUT SAID AXIS.