_Patents
U.S. Patent 4,944,261, issued July 31, 1990,
"Spherical Rotary Valve Assembly for an Internal Combustion Engine" U.S. Patent 4,953,527, issued September 4, 1990, "Spherical Rotary Valve Assembly for an Internal Combustion Engine" U.S. Patent 4,976,232, issued December 11, 1990, "Valve Seal for Rotary Valve Engine" U.S. Patent 4,989,558, issued February 5, 1991, "Spherical Rotary Valve Assembly for an Internal Combustion Engine U.S. Patent 4,989,576, issued February 5, 1991, "Internal Combustion Engine" U.S. Patent 5,048,979, issued September 17, 1991, "Self Adjusting Wheel Bearing Assembly" U.S. Patent 5,109,814, issued May 5, 1992, "Spherical Valve" U.S. Patent 5,361,739, issued November 8, 1994, "Spherical Rotary Valve Assembly for use in Rotary Valve Internal Combustion Engine" U.S. Patent 5,601,405, issued February 11, 1997, "Valve Apparatus for Steam Turbines" U.S. Patent 6,293,098B1, issued September, 25, 2001, "Methods and Apparatus for Joining Pressurized Exhaust Manifold Sections" U.S. Patent 6,308,676B1, issued October 30, 2001 "Cooling System for Rotary Valve Engine" U.S. Patent 6,666,458B2, issued December 23, 2003, "Valve Seal for Rotary Engine" U.S. Patent 6,668,785B1, issued December 30, 2003, "Piston Head for Internal Combustion Engine" U.S. Patent 6,718,933B1, issued April 13, 2004, "Valve Seal for Rotary Valve Engine" U.S. Patent 6,779,504B2, issued August 24, 2004, "Spherical Rotary Intake Valve for Engine Assembly" U.S. Patent 6, 779,925B2, issued August 24, 2004, "Bearing Assembly" U.S. Patent 6,789,516, issued September 14, 2004. "Rotary Valve & Valve Seal Assembly for Rotary Valve Engine having Hemispherical Combustion Chambers" U.S. Patent 6,880,511B1, issued April 19, 2005, "Seal Pressure Regulator" Additional applications are being filed with respect to new technology not evidenced in the present prototypes. Coates also has been issued over one hundred patents in Japan, Australia, Brazil, Taiwan, Korea, Canada, South Africa, Saudi Arabia, Turkey, and the European Patent Community.
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