Rotary engine with two concentric rotors

Claim 1

A ROTARY ENGINE COMPRISING AN INNER ROTOR, AN OUTER ROTOR AND AN ECCENTRIC SUPPORT FOR SAID INNER ROTOR ALL ROTATABLE RELATIVELY TO ONE ANOTHER, SAID SUPPORT SHARING A FIRST AXIS OF ROTATION WITH SAID OUTER ROTOR AND DEFINING A SECOND AXIS OF ROTATION PARALLEL TO SAID FIRST AXIS FOR SAID INNER ROTOR, SAID OUTER ROTOR FORMING A CLOSED SHELL AROUND SAID INNER ROTOR WITH AN INNER PERIPHERAL WALL HAVING N PERIPHERALLY EQUISPACED LOBES OF GENERALLY EPITROCHOIDAL CONFIGURATION, SAID INNER ROTOR HAVING AN OUTER PERIPHERAL WALL FORMED SUBSTANTIALLY AS A REGULAR POLYGON WITH N+1 CORNERS SLIDINGLY CONTACTING SAID INNER PERIPHERAL WALL, COUPLING MEANS INTERLINKING SAID OUTER ROTOR AND SAID INNER ROTOR FOR ROTATION RELATIVE TO SAID SUPPORT AT RESPECTIVE ANGULAR VELOCITIES BEING IN A RATIO OF (N+1) : N WHEREBY SAID CORNERS ARE CONSTRAINED TO SLIDE ALONG SAID INNER PERIPHERAL WALL, CONDUIT MEANS OPENING INTO SAID SHELL FOR THE ADMISSION AND EXPULSION OF A WORKING FLUID AT CERTAIN OF SAID LOBES, A CIRCULAR ARRAY OF AT LEAST N+1 PLANETARY GEARS CENTERED ON SAID SECOND AXIS AND MOUNTED ON SAID INNER ROTOR FOR INDEPENDENT ROTATION, ANNULAR GEAR MEANS RIGID WITH SAID OUTER ROTOR CENTERED ON SAID FIRST AXIS AND POSITIONED FOR STAGGERED CO-OPERATION WITH SAID PLANETARY GEARS UPON RELATIVE ROTATION OF SAID ROTORS, A RING GEAR CENTERED ON SAID SECOND AXIS IN CONSTANT MESH WITH ALL SAID PLANETARY GEARS, AND A POWER SHAFT COUPLED WITH SAID RING GEAR.