ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,553,402, issued on Feb. 17, was assigned to Arctic Cat Inc. (Thief River Falls, Minn.).
"Multi-port exhaust valve" was invented by Carson Price (Minnetonka, Minn.) and Jeremy Mammen (Thief River Falls, Minn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An exhaust valve includes a toroidal surface about an axis of rotation of the valve. The toroidal surface is positionable over a central exhaust port of an engine when lowered. The valve is raised by an actuator in response to increasing rotational speed of the crankshaft of the engine, thereby enlarging and raising the effective opening of the exhaust port. Lateral valve surfaces on either side of the ...