The U.S. Patent Office issues patents weekly. These patents were issued Tuesday for inventors in the Lexington area: Dirt cup assembly with attachable and detachable external filter holder. Inventors: Danielle Hafling, Lancaster; Joel Hitzelberger, Danville; and Alan Pullins, Lexington. Patent 7,185,394 assigned to Panasonic Corp. of North America, Secaucus, N.J.
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