Rotary fluid machine

Claim 1

A ROTARY FLUID MACHINE COMPRISING: (A) A SUPPORT FRAME; (B) A DRUM ROTATIVELY MOUNTED ON SAID FRAME ABOUT A FIRST AXIS; (C) A PAIR OF AXIALLY-SPACED INTERNALLY-TOOTHED ROTORS FIXED IN SAID DRUM TO ROTATE WITH IT ON SAID SUPPORT FRAME; (D) A PAIR OF AXIALLY-SPACED EXTERNALLY-TOOTHED ROTORS ECCENTRICALLY PIVOTED ON SAID FRAME ABOUT A SECOND AXIS WHICH IS PARALLEL WITH AND SPACED FROM SAID FIRST AXIS AND ENGAGING SAID INTERNALLY-TOOTHED ROTORS TO FORM FLUID DISPLACEMENT CHAMBERS BETWEEN THE ROTOR TEETH WHICH ARE ALTERNATELY EXPANDED AND REDUCED IN VOLUME AS SAID ROTORS ARE ROTATED WITH SAID DRUM ABOUT SAID FIRST AXIS; (E) MEANS CARRIED BY THE DRUM AND SEALING THE OUTER ENDS OF SAID FLUID DISPLACEMENT CHAMBERS; (F) A STATIONARY PLATE MOUNTED ON SAID SUPPORT FRAME BETWEEN BOTH PAIRS OF SAID AXIALLY SPACED ROTORS AND SEALING THE INNER ENDS OF SAID FLUID DISPLACEMENT CHAMBERS; (G) AND FLUID INLET AND OUTLET CONDUITS PROVIDED IN SAID STATIONARY PLATE AND OPENING INTO SAID FLUID DISPLACEMENT CHAMBERS AT APPROPRIATE LOCATIONS FOR CONDUCTING FLUID INTO AND FROM SAID CHAMBERS AS SAID DRUM IS ROTATED, SAID FLUID INLET CONDUIT HAVING INLET PORTS OPENING INTO THE FLUID DISPLACEMENT CHAMBERS ON BOTH SIDES OF SAID STATIONARY PLATE AT THE SAME ANGULAR LOCATION ABOUT SAID FIRST AXIS, SO THAT THE FLUID PRESSURES AT THE INLET PORTS ARE EQUAL ON BOTH SIDES OF SAID STATIONARY PLATE, AND SAID FLUID OUTLET CONDUIT HAVING OUTLET PORTS OPENING INTO THE FLUID DISPLACEMENT CHAMBERS ON BOTH SIDES OF SAID STATIONARY PLATE AT THE SAME ANGULAR LOCATION ABOUT THE FIRST AXIS, AND ANGULARLY SPACED FROM SAID INLET PORTS, SO THAT THE FLUID PRESSURES AT THE OUTLET PORTS ARE EQUAL ON BOTH SIDES OF THE STATIONARY PLATE.