Sonic apparatus for material separation

Claim 1

IN AN APPARATUS FOR SEPARATING UNLIKE GRANULAR PARTICLES, THE COMBINATION OF: A STACK OF VERTICALLY SPACED, GENERALLY HORIZONTALLY DISPOSED ELASTIC DISKS, SAID DISKS BEING ELASTICALLY VIBRATORY IN A FLEXURAL MODE AT ONE COMMON RESONANT FREQUENCY, MEANS STRUCTURALLY AND SUBSTANTIALLY RIGIDLY UNITING THE CENTRAL PORTIONS OF THE DISKS OF SAID STACK TO ONE ANOTHER, A VIBRATOR CONNECTED TO SAID UNITING MEANS FOR VIBRATING SAID MEANS VERTICALLY AT SAID RESONANT FREQUENCY, SO AS TO INDUCE HIGH AMPLITUDE RESONANT FLEXURAL VIBRATION OF SAID DISKS, MEANS FOR FEEDING SAID MATERIALS TO THE UPPERMOST OF SAID DISKS, SLOPING, FLOW DIRECTING BAFFLES LOCATED BETWEEN SAID DISKS AND EXTENDING FROM OUTSIDE THE PERIPHERAL EDGE LINE OF THE DISKS TO A REGION INWARDLY THEREOF AND ABOVE THE DISK BELOW, WHEREBY OVERFLOW OFF THE PERIPHERIES OF THE DISKS IS DELIVERED TO THE DISKS BELOW BY GRAVITY FLOW, A HOUSING AROUND SAID DISKS FOR CONFINING DUST CREATED BY THE VIBRATION OF THE PLATES, SAID HOUSING HAVING AN OPENING IN THE LOWER PORTION THEREOF FOR DISCHARGING THE OVERFLOW FROM THE LOWERMOST OF THE DISKS, AND AN AIR AND DUST