US Patent Issued to Polk Audio on July 8 for "Loudspeaker cone with raised curved protrusions and methods for controlling resonant modes" (Maryland Inventors)

ALEXANDRIA, Va., July 9 -- United States Patent no. 12,356,168, issued on July 8, was assigned to Polk Audio LLC (Vista, Calif.).

"Loudspeaker cone with raised curved protrusions and methods for controlling resonant modes" was invented by Sean O'Brien (Harwood, Md.) and Stuart W. Lumsden (Baltimiore, Md.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A loudspeaker transducer diaphragm or cone (e.g., 201, 301 or 401) is configured with arcuate protrusions that project distally from the main forward or distal surface 230 to provide stiffening and a break-up of resonant vibration modes when the loudspeaker is in use. The protrusions (e.g., 210, 310 or 410) are convex on one surface 230 and concave on the opposi...