Centrifugal fluid pump

Claim 1

A FLUID OF THE CENTRIFUGAL TYPE COMPRISING AXIALLY ALIGNED ANNULAR STATIONARY AND ROTATABLE MEMBERS IN SUBSTANTIALLY CONTIGUOUS RELATIONSHIP EACH HAVING A SEMITOROIDAL-SHAPED FLUID CAVITY DEFINED THEREIN, SAID CAVITIES FACING EACH OTHER TO TOGETHER DEFINE A TOROIDAL-SHAPED CAVITY FOR THE FLOW OF FLUID THEREAROUND, SAID ROTATABLE MEMBER CAVITY HAVING CIRCUMFERENTIALLY SPACE BLADES MOUNTED THEREIN AND EXTENDING ACROS THE AXIAL WIDTH THEREOF, SAID STATIONARY MEMBER HAVING A FLUID INLET AND AN OUTLET CIRCUMFERENTIALLY SEPARATED BY A FLUID FLOW ABUTMENT BLOCKING COMMUNICATION IN THE NORMAL FLOW DIRECTION BETWEEN SAID INLET AND OUTLET THROUGH SAID STATIONARY MEMBER CAVITY, SAID ABUTMENT HAVING A RADIAL SEAL SURFACE IN FLUID SEALING RELATIONSHIP WITH SAID ROTOR BLADES, THE RADIALLY INNER CIRCUMFERENTIAL PORTION OF SAID ABUTMENT SURFACE BEING LONGER THAN THE CIRCUMFERENTIAL SPACE BETWEEN A PAIR OF ROTOR BLADES TO TRAP FLUID IN SAID SPACE AS SAID PAIR OF BLADES ROTATES PAST SAID SURFACE, THE RADIALLY OUTER PORTION OF SAID ABUTMENT SURFACE BEING CIRCUMFERENTIALLY SHORTER THAN SAID INNER PORTION AND THE SPACES BETWEEN PAIRS OF BLADES WHEREBY A PORTION OF THE FLUID TRAPPED IN EACH OF SAID ROTOR BLADE SPACES AS IT PASSES SAID ABUTMENT IS FORCED TOWARDS SAID INLET PRIOR TO THE COMMUNICATION OF ALL OF THE SPACE WITH SAID INLET.