Patents by Inventor Donald S. Schroeder

Donald S. Schroeder 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).

  • Compact, multiple-element speaker system
    Patent number: 4122315
    Abstract: A compact, multiple-element, high-fidelity speaker system for use in confined areas has electrically independent woofer, mid-range and tweeter elements mounted on a common frame with the mid-range and tweeter elements disposed in the conical volume of the woofer cone. Recesses in the woofer cone provide clearance for the drivers of the mid-range and tweeter elements.
    Type: Grant
    Filed: June 13, 1977
    Date of Patent: October 24, 1978
    Assignee: Pemcor, Inc.
    Inventors: Donald S. Schroeder, James F. Novak
  • Loudspeaker
    Patent number: D253108
    Type: Grant
    Filed: June 13, 1977
    Date of Patent: October 9, 1979
    Assignee: Pemcor, Inc.
    Inventor: Donald S. Schroeder