Rotary piston engine

Claim 1

IN A ROTARY PISTON COMPRESSOR, AN OUTER INTERNALLY TOOTHED PISTON, AN INNER EXTERNALLY TOOTHED PISTON INSIDE THE OUTER PISTON AND ECCENTRIC THERETO, MEANS SUPPORTING SAID PISTONS FOR ROTATION ON THEIR RESPECTIVE AXES, MEANS FOR DRIVING THE OUTER PISTON IN ROTATION AND THE INNER PISTON BEING DRIVEN BY THE OUTER PISTON, A CASING ENCLOSING THE PISTONS AND INCLUDING PORT MEANS IN ONE END WALL COMMUNICATING WITH THE SPACES BETWEEN SAID PISTONS FOR THE MOVEMENT OF GAS BEING COMPRESSED THROUGH THE COMPRESSOR, THE TEETH OF SAID OUTER PISTON WHEN VIEWED IN THE AXIAL DIRECTION BEING WIDE WITH RESPECT TO THE HEIGHT THEREOF AND THE TOOTH SPACES THEREBETWEEN BEING NARROW THE TEETH OF SAID INNER PISTON WHEN VIEWED IN THE AXIAL DIRECTION BEING NARROW WITH RESPECT TO THE HEIGHT THEREOF AND TAPERING INWARDLY TOWARD THE TIPS, SAID TIPS OF THE TEETH OF THE INNER ROTARY PISTON BEING ROUNDED WITH A RADIUS WHICH DOES NOT EXCEED FROM 1% TO 3% OF THE DIAMETER OF SAID INNER ROTARY PISTON WHEREBY THE CIRCUMFERENTIAL FORCES EXERTED BY THE GAS BEING COMPRESSED ON THE SIDES OF THE TEETH OF THE INNER ROTARY PISTON ARE SUBSTANTIALLY BALANCED.