Patents by Inventor Friedrich Schellenberger

Friedrich Schellenberger 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).

  • Disk pack drive with electric motor having sintered permanent magnets
    Patent number: 4819104
    Abstract: A low-cost, compact disk pack drive with an external rotor motor permanent magnet-excited by sintered ferrite magnets in the form of partial shells is to be provided. The external rotor motor is arranged inside the pack space of the disk pack and sintered ferrite excitation magnets are used, having a surface metallization which have been sealed.
    Type: Grant
    Filed: September 18, 1986
    Date of Patent: April 4, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventors: Albert Dierkes, Joachim Gilly, Ernst Grecksch, Friedrich Schellenberger