Impeller for centrifugal pump

Claim 1

A CENTRIFUGAL PUMP IMPELLER HAVING AN UPSTREAM FACE AND AN OPPOSITE DOWNSTREAM FACE AND CAUSING, WHEN ROTATABLY DRIVEN, A FLUID TO FLOW AXIALLY FROM SAID UPSTREAM FACE TO SAID DOWNSTREAM FACE, SAID IMPELLER BEING PARTICULARLY SUITABLE FOR A PUMP OF RELATIVELY SMALL SIZE AND CONSISTING OF A CIRCULAR PLATE HAVING FORMED THERETHROUGH A CENTRAL CIRCULAR MOUNTING APERTURE AND ARCUATE SLOTS DISPOSED AT SPACED INTERVALS AROUND A CIRCLE CONCENTRIC TO SAID CIRCULAR APERTURE, SAID CIRCLE BOUNDING IN THE PLATE A CENTRAL FLAT PORTION AND AN OUTER PORTION COMPRISING A FIRST SERIES OF SECTORS EXTENDING RADIALLY FROM SAID SLOTS AND ANOTHER SERIES OF SECTORS INTERLOCKED WITH THE SECTORS OF THE FIRST SERIES, THE SECTORS OF ONE SERIES BEING AXIALLY SHIFTED IN A DIRECTION FROM THE CENTRAL FLAT PORTION OF THE CIRCULAR PLATE AND THE SECTORS OF THE OTHER SERIES BEING AXIALLY SHIFTED IN THE OPPOSITE DIRECTION AT THE SAME DISTANCE FROM THE CENTRAL FLAT PORTION OF THE CIRCULAR PLATE, THE PLATE FACE FROM WHICH THE SECTORS OF THE FIRST SERIES PROTRUDE RELATIVE TO THE CENTRAL FLAT PORTION FORMING THE UPSTREAM FACE OF THE IMPELLER AND THE SECTORS OF THE OTHER SERIES FORMING THE DOWNSTREAM FACE OF THE IMPELLER.