Patents by Inventor Martina Effenberg

Martina Effenberg 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).

  • Recording disk having a non-magnetizable hub cover
    Patent number: 5729414
    Abstract: A recording disk having an enclosure and a central hub. The hub is made of a magnetizable metal part and a non-magnetizable cover, which substantially completely covers the magnetizable part. The cover prevents recording/reproducing errors which are caused by metal particles of the magnetizable part. The cover may be made of injection molded thermoplastic.
    Type: Grant
    Filed: July 21, 1992
    Date of Patent: March 17, 1998
    Assignee: EMTEC Magnetics GmbH
    Inventors: Wolfgang Goede, Martina Effenberg