1. M.T. York, High Power Permanent Magnet Hybrid Alternator Rotor (U.S. Patent 6744165, June 1/2004)
2. A.D. Akemakou, Hybrid Alternator with Axial End Retainers for Permanent Magnets (U.S. Patent 6784586, Aug. 31/2004)
3. C.D. Syverson, Hybrid Alternator (U.S. Patent 5397975, Mar. 14/1995)
4. U. Schüller, J. Brandes, Hybrid-Energized Synchronous Electric Machines (U.S. Patent 5731647, Mar 24/1998)
5. M.S. Shah, G.B. Kliman, M.V.K. Chari, Hybrid Salient Pole Machine (U.S. Patent 6784585, Aug. 31/2004)