ALEXANDRIA, Va., July 3 -- United States Patent no. 12,345,221, issued on July 1, was assigned to K&N Engineering Inc. (Riverside, Calif.).
"Curved base air filter" was invented by Steve E. Williams (Cherry Valley, Calif.) and Jere James Wall (Helendale, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus and methods are provided for an air cleaner to be mounted onto an air inlet of an internal combustion engine. The air cleaner comprises an air filter that includes a filter medium disposed between a curved base and a cover. The curved base provides an interface between the air filter and the air inlet, and comprises a shape that provides clearance between the curved base and an electric choke...