Patents by Inventor Berta Grushko

Berta Grushko 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).

  • Self-amplified loudspeaker
    Patent number: D531164
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: October 31, 2006
    Assignee: Bogen Communications, Inc.
    Inventors: Isaac Ferstenberg, Thomas A. Nelson, Berta Grushko