ALEXANDRIA, Va., March 26 -- United States Patent no. 12,257,538, issued on March 25, was assigned to K&N Engineering Inc. (Riverside, Calif.).
"Air filter precleaner" was invented by Gilbert Heck (Nuevo, Calif.) and Steve Williams (Cherry Valley, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus and methods are provided for an air filter precleaner for an open air filter box. The air filter precleaner includes a filter medium between a base and a grating that are fastened over an opening into an interior of the air filter box. The filter medium comprises a sheet of filter material having a shape and a size suitable for being supported between the base and the grating. The base is a rigid me...