Patents by Inventor Lloyd W. Cockrum

Lloyd W. Cockrum 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).

  • Subwoofer speaker system
    Patent number: 5147986
    Abstract: A subwoofer system for providing acoustic energy is provided. The subwoofer or full-range speaker enclosure is divided into at least three chambers. A first speaker acoustically couples the first chamber with the third chamber. A second speaker acoustically couples the second chamber with the third chamber. A first port acoustically couples the first chamber to the exterior of the enclosure. A second port acoustically couples the second chamber to either the first chamber or the exterior of the enclosure. The speakers are driven out-of-phase with respect to the third chamber so as to maintain the third chamber in a substantially constant-pressure state.
    Type: Grant
    Filed: December 3, 1990
    Date of Patent: September 15, 1992
    Assignee: Tandy Corporation
    Inventors: Lloyd W. Cockrum, Christopher Kline