Patents by Inventor Klaus Michaelsen

Klaus Michaelsen 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).

  • Magnetic liquid shaft seal
    Patent number: 4681328
    Abstract: A shaft seal containing magnetic liquid, for pump shafts or the like, consists of a permanent magnet which surrounds the shaft and is a distance away and one or more pole pieces connected to the said magnet. The pole piece, together with the shaft surface, forms an air gap in which the magnetic liquid is held by the magnetic field, so that a liquid sealing ring is produced. A volume of gas located between the magnetic liquid seal and the shaft channel to the medium prevents the magnetic liquid from coming into contact with the medium.
    Type: Grant
    Filed: November 6, 1986
    Date of Patent: July 21, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Klaus Ritter, Klaus Michaelsen, Gunther Mair