Patent ID: 7814882

Claim:
An internal combustion engine comprising a working chamber assembly including first and second piston assemblies each of which assemblies having at least one pair of diametrically opposed pistons rotatable about a rotational axis of said piston assemblies, a means for interconnecting said first and second piston assemblies for variable-speed rotation in same direction during recurrent periods of rotation, a working chamber assembly housing, a connecting means housing, and a cooling and lubrication means, wherein said piston having a piston head and a piston vessel, said piston head of said first piston assembly received by said piston vessel of said second piston assembly, said piston head of said first piston assembly and said piston vessel of said second piston assembly together form a first working chamber, said piston head of said second piston assembly received by said piston vessel of said first piston assembly, said piston head of said second piston assembly and said piston vessel of said first piston assembly together form a second working chamber, said piston vessel includes an intake port and a frustoconical rotary intake port valve, and said piston vessel includes an exhaust port and a frustoconical rotary exhaust port valve.