Patents by Inventor William O. Doerring

William O. Doerring has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Ultra low frequency transducer and loud speaker comprising same
    Patent number: 8023688
    Abstract: An ultra low frequency transducer or subwoofer for automotive speaker systems with a polygonal, concave diaphragm. The periphery preferably is sized to be substantially coextensive with the front of the speaker housing or cabinet. In this way, air displacement in the subwoofer is maximized for a given size of enclosure, and thus so is the loudness of the speaker. The transducer typically includes a frame or basket with a polygonal front for supporting the periphery of the diaphragm. The preferred diaphragm includes a convex surround with pleated corners. For increased durability, trusses are formed in the diaphragm.
    Type: Grant
    Filed: January 29, 2008
    Date of Patent: September 20, 2011
    Assignee: Stillwater Designs and Audio, Inc.
    Inventors: Steven M. Irby, William O. Doerring