Patents by Inventor Karl Kerstein

Karl Kerstein 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).

  • Loudspeaker diaphragm
    Patent number: D705756
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: May 27, 2014
    Assignee: Alpine Electronics, Inc.
    Inventors: Karl Kerstein, Chris Teguh, Melvin Diaz