Patents by Inventor Mark Ditzig

Mark Ditzig 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).

  • Telephone cord rotary connector
    Patent number: D355891
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: February 28, 1995
    Assignee: Telephone Products, Inc.
    Inventors: Albert Ditzig, Mark Ditzig